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Power Engineering Terms > All Terms 3 > Flashcards

All Terms 3 Flashcards

1
Q

DUST

A

An air suspension (aerosol) or particles of any solid material, usually with particle size less than 100 microns.

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2
Q

DYNAMIC DISCAHRGE HEAD

A

Static discharge head plus friction head plus velocity head.

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3
Q

DYNAMIC LOAD

A

An imposed force that is in motion, that is, one that may vary in magnitude, sense, and direction.

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4
Q

DYNAMIC PUMPS

A

Pumps in which energy is added to the water continuously and the water is not contained in a set volume.

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5
Q

DYNAMIC SUCTION HEAD

A

Positive static suction head minus friction head and minus velocity head.

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6
Q

DYNAMIC SUCTION LIFT

A

The sum of suction lift and velocity head at the pump suction when the source is below pump centerline.

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7
Q

DYNAMIC SYSTEM

A

An ion

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8
Q

ECONOMIZER

A

A series of tubes located in the path of flue gases. Feedwater is pumped through these tubes on its way to the boiler in order to absorb waste heat from the flue gas.

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9
Q

EDDY CURRENT TESTING

A

An electromagnetic nondestructive testing method in which eddy

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10
Q

EDTA

A

A chelating agent used with boiler water treatment. Often referred as the replacement for the phosphate

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11
Q

EFFECTIVE TEMPERATURE

A

Overall effect on a human of air temperature, humidity and air movement.

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12
Q

EFFECTIVE TEMPERATURE

A

Overall effect on a human of air temperature, humidity and air movement.

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13
Q

EFFLUENT

A

The solution which emerges from an ion

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14
Q

ELECTRIC DEFROSTING

A

Use of electric resistance heating coils to melt ice and frost off evaporators during defrosting.

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15
Q

ELECTRICAL CIRCUIT

A

A power supply, a load, and a path for current flow are the minimum requirements for an electrical circuit.

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16
Q

ELECTROCHEMICAL REACTIONS

A

A metal wasting process, due to the fluid (boiler water) being subjected to an electrical current.

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17
Q

ELECTRODE BOILER

A

A boiler which generates steam or hot water by the action of immersed electrodes which conduct electricity through the boiler water, which, in turn, generates

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18
Q

ELECTRODIALYSIS

A

This is a membrane process where an applied electric charge draws impurity ions through permeable membranes to create high purity feedwater streams or low

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19
Q

ELECTROLYSIS

A

Chemical decomposition caused by action of an electric current in a solution.

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20
Q

ELECTROLYTE

A

A chemical compound which dissociates or ionizes in water to produce a solution which will conduct an electric current

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21
Q

ELECTROMECHANICAL

A

Converting electrical input into mechanical action. A relay is an electromechanical switch.

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22
Q

ELECTROREGENERATION

A

Hydrogen and hydroxyl ions are formed be electrical splitting of water molecules and are swept through the unit by steady, low

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23
Q

ELEMENT

A

A pure substance that cannot be broken down by chemical means to a simpler substance.

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24
Q

ELEVATION HEAD

A

The energy possessed per unit weight of a fluid because of its elevation.

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25
Q

ELUTION

A

The stripping of adsorbed ions from an ion

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26
Q

EMULSION

A

A colloidal dispersion of one liquid in another.

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27
Q

ENDOTHERMIC REACTION

A

Pertaining to a chemical reaction which is accompanied by an absorption of heat.

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28
Q

ENERGY

A

Expressed in kilowatt

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29
Q

ENERGY

A

In the simplest terms, energy is the ability to perform work. It may exist in several forms, such as heat energy, mechanical energy, chemical energy, or electrical energy, and may

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30
Q

ENERGY

A

The ability to do work. Energy can exist in one of several forms, such as heat, light, mechanical, electrical or chemical. Energy can neither be created nor destroyed, but can be

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31
Q

ENERGY (CONSUMPTION) CHARGE

A

That part of an electric bill based on kWh consumption (expressed in cents per kWh). Energy charge covers cost of utility fuel, general operating

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32
Q

ENGINE

A

Prime mover

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33
Q

ENGINE OIL

A

An oil used to lubricate an internal combustion engine.

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34
Q

ENTHALPY

A

The total quantity of heat energy contained in a substance, also called total heat

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35
Q

ENTRAINMENT

A

The transport of water into a gas stream. In a boiler, this is carryover, in a cooling tower, drift.

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36
Q

ENTRAINMENT (HVAC)

A

The capture of part of the surrounding air by the air stream discharged from an outlet (some times called secondary air motion).

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37
Q

ENTROPY

A

The ratio of the heat added to a substance to the absolute temperature at which it is added.

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38
Q

ENVIRONMENT

A

The aggregate of all conditions (such as contamination, temperature, humidity, radiation, magnetic and electric fields, shock, vibration) that externally influence the

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39
Q

EPSON SALT

A

Magnesium sulfate.

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40
Q

EQUALIZING HOLE (STEAM TURBINE)

A

A hole in the turbine disc designed to equalize axial thrust with impulse bladed turbines.

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41
Q

EQUILIBRIUM REACTIONS

A

The interaction of ionizable compounds in which the products obtained tend to revert to the substance from which they were formed until a balance is

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42
Q

EQUIVALENT WEIGHT

A

Refers to the amount of an element combining with a unit weight of hydrogen. In terms of water treatment, a method used to calculate the concentration of a

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43
Q

EROSION , ABRASIVE

A

Erosive wear caused by relative motion of solid particles which are present in fluids and are moving parallel to a solid surface.

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44
Q

EROSION, CAVITATION

A

Progressive loss of original material from a solid surface due to continuing exposure to cavitation.

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45
Q

EROSION, IMPINGEMENT

A

Loss of material from a solid surface due to liquid impingement.

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46
Q

EROSION, LIQUID

A

Removal of films or metal by mechanical action and corrosion of active metal.

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47
Q

EROSION

A

CORROSION

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48
Q

ETHANE (R

A

170)

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49
Q

EUTECTIC

A

An isothermal reversible reaction in which a liquid solution is converted into two or more intimately mixed solids on cooling.

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50
Q

EUTECTIC POINT

A

Freezing temperature for eutectic solutions.

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51
Q

EVACUATION

A

The removal of gases from a system.

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52
Q

EVAPORATION

A

The change of state from liquid to vapor, for example as water evaporates to a vapor in a cooling tower.

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53
Q

EVAPORATIVE CONDENSER

A

A condenser which has water flowing over coils containing the refrigerant gas which is thus cooled and condensed by evaporation of that water.

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54
Q

EVAPORATIVE CONDENSER

A

Device which uses open spray or spill water to cool a condenser. Evaporation of some of the water cools the condenser water and reduces water

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55
Q

EVAPORATIVE COOLING

A

The adiabatic exchange of heat between air and a water spray or wetted surface. The water approaches the wet

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56
Q

EVAPORATOR

A

The heat exchanger in which the medium being cooled, usually air or water, gives up heat to the refrigerant through the exchanger transfer surface. The liquid

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57
Q

EVAPORATOR FAN

A

Fan which increases airflow over the heat exchange surface of evaporators.

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58
Q

EVAPORATOR PRESSURE REGULATOR

A

Automatic pressure regulating valve mounted in suction line between evaporator outlet and compressor inlet. Its purpose is to maintain a

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59
Q

EVAPORATOR, FLOODED

A

Evaporator containing liquid refrigerant at all times.

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60
Q

EXFlLTRATION

A

The flow of air outward from a space through walls, leaks, etc.

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61
Q

EXFOLIATION

A

Scaling off of a surface in flakes or layers as the result of corrosion.

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62
Q

EXHAUSTION

A

The state in which the adsorbent is no longer capable of useful ion exchange

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63
Q

determined arbitrarily in terms of (1) a value in parts per million of ions in the effluent solution

A

and (2) the reduction inequality of the effluent water determined by conductivity bridge

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64
Q

EXOTHERMIC

A

Chemical reaction in which heat is released.

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65
Q

EXPANSION JOINT

A

Device in piping designed to allow movement of the pipe caused by the pipe’s expansion and contraction.

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66
Q

EXPANSION TANK

A

A reservoir usually above a closed re

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67
Q

EXPANSION VALVE

A

Device in refrigerating system which reduces the pressure from the high side to the low side and is operated by pressure.

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68
Q

EXPANSION VALVE, CAPILLARY TUBE

A

A tube of small internal diameter used as liquid refrigerant flow control and pressure reducer between high and low sides. Also used to

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69
Q

EXPANSION VALVE, THERMOSTATIC

A

Control valve operated by temperature and pressure within evaporator. It controls flow of refrigerant. Control bulb is attached to outlet of

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70
Q

EXPENDABLE REFRIGERANT SYSTEM

A

System, which discards the refrigerant after it has evaporated.

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71
Q

EXTERNAL DRIVE

A

Term used to indicate a compressor driven directly from the shaft or by a belt using an external motor. Compressor and motor are serviceable separately.

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72
Q

EXTERNAL EQUALIZER

A

Tube connected to low

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73
Q

EXTERNAL TREATMENT

A

Refers to the treatment of water before it enters the boiler.

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74
Q

FAIL SAFE

A

In load management, returning all loads to conventional control during a power failure. Accomplished by a relay whose contacts are normally closed.

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75
Q

FAILURE

A

A rupture, break, or disintegration of a metal or part of an HVAC system.

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76
Q

FALSE BRINELING

A

Damage to a solid bearing surface characterized by indentations not caused by plastic deformation resulting from overload, but thought to be due to other causes

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77
Q

FAN PERFORMANCE CURVE

A

Fan performance curve refers to the constant speed performance curve. This is a graphical presentation of static or total pressure and power input over

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78
Q

ex tends from shutoff (zero air volume flow rate) to free delivery (zero fan static pressure). The pressure curves are generally referred to as the pressure

A

volume curves.

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79
Q

FAN TUBE AXIAL

A

A propeller or disc type wheel within a cylinder and including driving mechanism supports for either belt drive or direct connection.

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80
Q

FAN, CENTRIFUAL

A

A fan rotor or wheel within a scroll type housing and including driving mechanism sup ports for either belt drive or direct connection.

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81
Q

FAN, PROPELLER

A

A propeller or disc type wheel within a mounting ring or plate and including driving mechanism supports for either belt drive or direct connection.

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82
Q

FAN, VANEAXIAL

A

A disc type wheel within a cylinder, a set of air guide vanes located either before or after the wheel and including driving mechanism supports for either belt drive or

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83
Q

FARAD

A

A unit of electric capacity, designated by F.

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84
Q

FATIGUE

A

The phenomenon leading to fracture under repeated or fluctuating stresses having maximum value less than the ultimate strength of the material.

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85
Q

FAULT

A

A short circuit either line to line, or line to ground.

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86
Q

FEED WATER

A

Water which is fed to a system such as a boiler or cooling tower.

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87
Q

FEED WATER LINE

A

The piping leading to a system through which the feed water flows.

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88
Q

FEEDWATER HEATER

A

A device used to heat feedwater with steam.

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89
Q

FERRIC COAGULANT

A

Ferric sulfate Fe2(SO4)3 act to precipitate ferric hydroxide, coagulate at 4.0

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90
Q

FERRIC HYDROXIDE

A

The complete reaction product of iron, water, and oxygen, which forms a red precipitate in water [Fe(OH)3]

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91
Q

FERRIC ION

A

An iron atom that has a positive electric charge of +3. (Fe2+)

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92
Q

FERROUS

A

Metallic materials in which the principle component is iron.

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93
Q

FERROUS HYDROXIDE

A

The reaction product of iron and water in the absence of oxygen

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94
Q

FERROUS ION

A

An iron atom that has a positive electric charge of + 2(Fe2+).

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95
Q

FILMING AMINES

A

Amines that form a impervious non

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96
Q

FILTER

A

A device to remove solid material from a fluid.

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97
Q

FILTER

A

DRIER

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98
Q

FILTRATION

A

Is the process of passing a liquid containing suspended matter through a suitable porous material in such a manner as to effectively remove the suspended matter from

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99
Q

FIN

A

An extended surface to increase the heat transfer area, as metal sheets attached to tubes.

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100
Q

FIRE POINT

A

The temperature at which a material will continue to burn for at least 5 seconds without the benefit of an outside flame.

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101
Q

FIRE TUBE

A

A tube, in a boiler, through which the hot gases flow and transfer heat to the water on the outside of the tube.

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102
Q

FIRE WALL

A

The back end of a boiler, opposite the burner, at which the hot gases change direction of flow.

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103
Q

FIREBRICK

A

A refractory brick, often made from fire clay, that is able to withstand temperature in the range of 1500 to 1600°C, and is used to line furnaces.

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104
Q

FIXED DISPLACEMENT PUMP

A

A pump in which the displacement per cycle cannot be varied.

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105
Q

FLASH

A

The portion of a superheated fluid converted to vapor when its pressure is reduced.

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106
Q

FLASH CHAMBER

A

A separating tank placed between the expansion valve and the evaporator to separate and bypass any gas formed in the expansion valve.

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107
Q

FLASH GAS

A

The gas resulting from the instantaneous evaporation of refrigerant in a pressure

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108
Q

FLASH POINT

A

The temperature at which a material to give off sufficient vapor to form a flammable mixture.

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109
Q

FLASH TANK

A

A vessel used for separating the liquid phase from the gaseous phase formed from a rise in temperature and/or a reduction of pressure on the flowing stream.

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110
Q

FLASHING

A

Evaporation of a liquid into a vapor.

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111
Q

FLOCCULANT

A

An electrolyte added to a colloidal suspension to cause the particles to aggregate and settle out as the result of reduction in repulsion between particles.

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112
Q

FLOCCULATION

A

The process of agglomerating coagulated particles into settable flocs, usually of a gelatinous nature.

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113
Q

FLOODBACK

A

The condition of liquid refrigerant returning, usually from an overfed evaporator, to the compressor through the suction line.

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114
Q

FLOTATION

A

A process of separating solids from water by developing a froth.

115
Q

FLOW RATE

A

The volume of solution which passes through a given quantity of resin within a given time. Flow rate is usually expressed in terms of feet per minute per cubic foot of

116
Q

FLOW, LAMINAR OR STREAMLINE

A

Fluid flow in which each fluid particle moves in a smooth path substantially parallel to the paths followed by all other particles.

117
Q

FLOW, TURBULENT

A

Fluid flow in which the fluid moves transversely as well as in the direction of the tube or pipe axis, as opposed to streamline or viscous flow.

118
Q

FLUID

A

The general term that includes gas, vapor or liquid

119
Q

FLUID HEAD

A

The static pressure of fluid expressed in terms of the height of a column of the fluid, or of some manometric fluid, which it would support.

120
Q

FLUIDIZED BED

A

A contained mass of finely divided solid that behaves like a fluid when brought into suspension in a moving gas.

121
Q

FLY ASH

A

A finely divided siliceous material formed during the combustion of coal, coke, or other solid fuels.

122
Q

FOAM CARRYOVER

A

Is the development of excessive moisture in the steam from carryover of foam from the drum. Usually common in low pressure boilers due to high concentration

123
Q

FOAMING

A

Formation of steam bubbles on the surface of the boiler water due to high surface tension of the water.

124
Q

FORCE

A

The action on a body which tends to change its relative condition as to rest or motion.

125
Q

FORCE PUMP

A

A device used to inject a solution into a closed system through an opening such as a drain valve.

126
Q

FORCED CONVECTION

A

Movement of fluid by mechanical force such as fans or pumps.

127
Q

FORCED DRAFT COOLING TOWER

A

Cools water by mechanically forcing air through the tower.

128
Q

FORCE

A

FEED OILING

129
Q

FOULING

A

Deposits of impurities, dirt or foreign matter that clog systems or restrict flow and interfere with heat transfer.

130
Q

FOULING FACTOR

A

The degree of interference with heat transfer.

131
Q

FREEBOARD

A

The space provided above the resin bed in an ion

132
Q

FREEZER

A

A refrigerating device designed to lower the temperature below 0°C.

133
Q

FREEZER BURN

A

Condition applied to food which has not been properly wrapped and that has become hard, dry and discolored.

134
Q

FREEZE

A

UP

135
Q

FREEZING

A

Change of state from liquid to solid.

136
Q

FREEZING POINT

A

The temperature at which a liquid becomes solid.

137
Q

FREON

A

Trade name for a family of synthetic chemical refrigerants.

138
Q

FRESH WATER

A

Water that has little or no salt dissolved in it.

139
Q

FRICTION

A

Friction is the resistance found at the duct and piping walls. Resistance creates a static pressure loss in systems. The primary purpose of a fan or pump is to produce a

140
Q

FRICTION HEAD

A

The pressure in psi or feet of the liquid pumped which represents system resistance that must be overcome.

141
Q

FRIGORIFIC MIXTURE

A

Are substances used in laboratory methods of producing a drop in temperature. A common example is a mixture of snow and salt.

142
Q

FROST

A

Frozen condensation.

143
Q

FROST BACK

A

Condition in which liquid refrigerant flows from evaporator into suction line

144
Q

FROST CONTROL

A

Semiautomatic

145
Q

FROST FREE REFRIGERATOR

A

Refrigerated cabinet which operates with an automatic defrost during each cycle.

146
Q

FROSTING TYPE EVAPORATOR

A

Refrigerating system which maintains the evaporator at frosting temperatures during all phases of cycle.

147
Q

FRQUENCY

A

The number of vibrations, waves, or cycles of any periodic phenomenon per second. In architectural acoustics, the interest lies in the audible frequency range of 20 to

148
Q

FUEL KNOCK

A

A hammer like noise produced when fuel is not burned properly in a cylinder.

149
Q

FULL LOAD CURRENT

A

See Running Current.

150
Q

FUMES

A

Solid particles commonly formed by the condensation of vapors from normally solid materials such as molten metals. Fumes may also be formed by sublimation, distillation,

151
Q

FUNGUS

A

A lower form of plant life which does not contain chlorophyll, for example, a mold.

152
Q

FUSIBLE PLUG

A

Plug or fitting made with a metal of a known low melting temperature. Used as safety device to release pressures in case of fire.

153
Q

GAGE PRESSURE

A

Absolute pressure minus atmospheric pressure.

154
Q

GALVANIC ACTION

A

Wasting away of two unlike metals due to electrical current passing between them. The action is increased in the presence of moisture.

155
Q

GALVANIC CELL

A

Electrolytic brought about by the difference in electric potential between two dissimilar metals.

156
Q

GALVANIC COUPLE

A

The connection of two dissimilar metals in an electrolyte that results in current flow through the circuit.

157
Q

GALVANIZING

A

The coating of metal with another by an electrolytic process

158
Q

for example, electrolytically zinc

A

coat steel is called galvanized steel.

159
Q

GAS

A

Usually a highly superheated vapor which, within acceptable limits of accuracy, satisfies the perfect gas laws.

160
Q

GAS

A

Vapor phase or strata of a substance.

161
Q

GAS CONSTANT

A

The coefficient “R” in the perfect gas equation: PV = MRT.

162
Q

GAS LUBRICATION

A

A system of lubrication in which the shape and relative motion of the sliding surfaces cause the formation of a gas film having sufficient pressure to separate the

163
Q

GAS REFRIGERATION CYCLE

A

Where the refrigerant remains in the gaseous phase throughout.

164
Q

GAS TURBINE

A

An engine in which gas , under pressure is formed by combustion, is directed against a series of turbine blades. The energy in the expanding gas is converted into

165
Q

GAS TURBINE COMPRESSOR

A

a compressor designed foe the use with gas turbine installations. This could be centrifugal or an axial compressor.

166
Q

GAS VALVE

A

Device in a pipeline for starting, stopping or regulating flow of gas.

167
Q

GAS, INERT

A

A gas that neither experiences nor causes chemical reaction nor undergoes a change of state in a system or process

168
Q

GASIFICATION

A

When a substance is converted to become a gas.

169
Q

GASKET

A

A device, usually made of a deformable material, that is used between two relatively static surfaces to prevent leakage.

170
Q

GAUGE MANIFOLD

A

Chamber device constructed to hold both compound and high

171
Q

GAUGE VACUUM

A

Instrument used to measure pressures below atmospheric pressure.

172
Q

GENERAL CORROSION

A

Uniform overall corrosion of metal surfaces.

173
Q

GENERATING TUBE

A

A boiler tube used for evaporation.

174
Q

GENERATOR

A

A machine that changes that changes mechanical energy into electrical energy.

175
Q

GFI, GFCI

A

Ground fault (circuit) interrupter

176
Q

GRAIN

A

A unit of weight

177
Q

0.0648 grams

A

0.000143 pounds.

178
Q

GRAIN BOUNDARIES

A

Referring to the junction of crystallites.

179
Q

GRAINS OF MOISTURE

A

The unit of measurement of actual moisture contained in a sample of air. (7000 grains

180
Q

GRAINS PER GALLON

A

A unit of concentration. 1 gr/gal = 17.1 mg/L.

181
Q

GRAM

A

A unit of weight

182
Q

15.432 grains

A

0.0022 pounds.

183
Q

GRAM

A

MILLIQUIVALENTS

184
Q

GRAVITY

A

The attraction exerted by the earth’s mass on objects at its surface.

185
Q

GRAVITY, SPECIFIC

A

Density compared to density of standard material

186
Q

GREASE

A

A lubricant composed of an oil thickened with a soap or other thickener to a solid or semisolid consistency.

187
Q

GREASE, BLOCK

A

A grease that is sufficiently hard to retain its shape in block or stick form.

188
Q

GREASE, SODA BASED

A

A grease prepared from lubricating oil and sodium soap.

189
Q

GREEN LIQUOR

A

The liquor resulting from dissolved molten smelt from Kraft recovery furnace in water.

190
Q

GREENSAND

A

Naturally occurring materials, composed primarily of complex silicates, which possess ion

191
Q

GROOVING

A

A form of deterioration of boiler plate by a combination of localized corrosion and stress concentration.

192
Q

GROUND

A

Zero voltage, or any point connected to the earth or “ground”.

193
Q

GROUND BED

A

Cathodic protection, an interconnected group of impressed

194
Q

GROUND BUS

A

A busbar in a panel or elsewhere, deliberately connected to ground.

195
Q

GROUND COIL

A

Heat exchanger buried in the ground. May be used either as an evaporator or as a condenser.

196
Q

GROUND CONDUCTOR

A

Conductor run in an electrical system, which is deliberately connected to the ground electrode. Purpose is to provide a ground point throughout the system.

197
Q

GROUND FAULT

A

An unintentional connection to ground.

198
Q

GROUT

A

To force sealing material into a soil, sand or confined small space

199
Q

HAC

A

Hydrogen

200
Q

HALIDE LEAK DETECTOR

A

A device used to detect vapor leaks of halogen refrigerants. It uses acetylene as its base.

201
Q

HALIDE REFRIGERANTS

A

Family of refrigerants containing halogen chemicals.

202
Q

HALIDE TORCH

A

Type of torch used to safely detect halogen refrigerant leaks in system.

203
Q

HALOGENS

A

Substance containing fluorine, chlorine, bromine and iodine.

204
Q

HARD WATER

A

Water that contains dissolved compounds of calcium, magnesium or both.

205
Q

HARDNESS

A

Are generally referred to the presence of calcium and magnesium content of the water.

206
Q

HARDNESS

A

The scale

207
Q

forming and lather

A

inhibiting qualities which water, high in calcium and magnesium ions, possesses.

208
Q

HARDNESS CONTROL

A

An action designed to remove hardness and at the same time to produce an equivalent amount of suspended solids.

209
Q

HARDNESS OF CALCIUM CARBONATE

A

The expression ascribed to the value obtained when the hardness

210
Q

carbonate

A

a convenient method of reducing all salts to a common basic for comparison.

211
Q

HEAD

A

Pressure, usually expressed in feet of water, inches of mercury or millimeters of mercury.

212
Q

Head

A

The measure of the pressure of water expressed in feet of height of water: 1 psi = 2.31 feet of water.

213
Q

HEAD DYNAMIC OR TOTAL

A

In flowing fluid, the sum of the static and velocity heads at the point of measurement.

214
Q

HEAD PRESSURE

A

Pressure which exists in condensing side of refrigerating system.

215
Q

HEAD PRESSURE CONTROL

A

Pressure

216
Q

operated control which opens electrical circuit if high

A

side pressure becomes too high.

217
Q

HEAD STATIC

A

The static pressure of fluid expressed in terms of the height of a column of the fluid, or of some manometric fluid, which it would support.

218
Q

HEAD VELOCITY

A

Height of fluid equivalent to its velocity pressure in flowing fluid.

219
Q

HEADER

A

Length of pipe or vessel to which two or more pipe lines are joined carries fluid from a common source to various points of use.

220
Q

HEADLOSS

A

The loss of energy as a result of friction

221
Q

HEAT

A

Form of energy which acts on substances to raise their temperature

222
Q

HEAT CAPACITY

A

The amount of heat necessary to raise the temperature of a given mass one degree. Numerically, the mass multiplied by the specific heat.

223
Q

HEAT CONDUCTOR

A

A material capable of readily conducting heat. The opposite of an insulator or insulation.

224
Q

HEAT ENGINE

A

Mechanical devices which convert heat to work, such as the steam boiler, gas turbine, solar energy, refrigerators, steam engines, steam turbines.

225
Q

HEAT EXCHANGER

A

Device used to transfer heat from a warm or hot surface to a cold or cooler surface. (Evaporators and condensers are heat exchangers.)

226
Q

HEAT LAG

A

The time it takes for heat to travel through a substance heated on one side.

227
Q

HEAT LEAKAGE

A

Flow of heat through a substance.

228
Q

HEAT OF COMPRESSION

A

Mechanical energy of pressure changed into energy of heat.

229
Q

HEAT OF CONDENSATION

A

The latent heat given up by a substance as it changes from a gas to a liquid.

230
Q

HEAT OF FUSION

A

The latent heat absorbed when a substance changes from a solid state to a liquid state.

231
Q

HEAT OF RESPIRATION

A

Process by which oxygen and carbohydrates are assimilated by a substance

232
Q

HEAT OF VAPORIZATION

A

The latent heat absorbed by a substance as it changes from a liquid to a vapor.

233
Q

HEAT PIPE

A

A refrigeration device with no moving parts, but containing a refrigerants.

234
Q

HEAT PUMP

A

A device used to transfer heat from a low temperature to a high temperature medium also a reversed cycle in which work is the input and heat is rejected to a sink at a

235
Q

HEAT PUMP

A

A refrigerating system employed to transfer heat into a space or substance. The condenser provides the heat while the evaporator is arranged to pick up heat from air,

236
Q

HEAT SINK

A

Relatively cold surface capable of absorbing heat.

237
Q

HEAT TRANSFER

A

Flow of heat by conduction, convection and radiation.

238
Q

HEAT TRANSFER

A

Movement of heat from one body or substance to another. Heat may be transferred by radiation, conduction, convection or a combination of these three methods.

239
Q

HEAT, SENSIBLE

A

Heat which is associated with a change in temperature

240
Q

specific heat exchange of temperature

A

in contrast to a heat interchange in which a change of state (latent

241
Q

Heat, Specific

A

The ratio of the quantity of heat required to raise the temperature of a given mass of any substance one degree to the quantity required to raise the temperature of an

242
Q

Heat, Total (Enthalpy)

A

The sum of sensible heat and latent heat between an arbitrary datum point and the temperature and state under consideration.

243
Q

HEAT

A

EXCHANGER MATERIALS

244
Q

HEAT

A

TRANSFER MEDIUM

245
Q

SURFACE

A

That surface which is exposed to the heating medium for absorption and transfer of heat to the medium.HENRY’S LAW

246
Q

in a fluid based on temperature and partial pressure.HENRY

A

The unit of self

247
Q

inductance or mutual inductance in the metric system. Its symbol is H.HERMETIC

A

Sealed so that the

248
Q

object is gas tight.HERMETIC COMPRESSOR

A

Compressor which has the driving motor sealed inside the compressor housing. The motor operates in an atmosphere of the

249
Q

refrigerant.HERMETIC MOTOR

A

Compressor drive motor sealed within same casing which contains compressor.HERMETIC SYSTEM

250
Q

driven by a motor contained in compressor dome or housing.HERTZ

A

A unit in the metric system used to measure frequency in cycles per second. Its symbol is Hz.HIC

251
Q

Hydrogen

A

induced cracking. (Same as hydrogen embrittlement)HIDDEN DEMAND CHARGE

252
Q

demand charge. A low load factor for a building then penalizes the energy user through this “hidden” charge. HIDEOUT

A

Is the accumulation of chemicals on surfaces, in crevices or in

253
Q

deposits within the system during normal operation.HIGH LIMIT CONTROL

A

A device which normally monitors the condition of the controlled medium and interrupts system operation

254
Q

if the monitored condition be comes excessive, for example a high level of fluid in a storage tank.HIGH SIDE

A

Parts of the refrigerating system subjected to condenser pressure or higher

255
Q

the system from the compression side of the compressor through the condenser to the expansion point of the evaporator. HIGH

A

PRESSURE CUT

256
Q

OUT

A

Electrical control switch

257
Q

operated by the high

A

side pressure which automatically opens electrical circuit if too high pressure is reached.HIGH

258
Q

SIDE FLOAT

A

Refrigerant control mechanism which controls the

259
Q

level of the liquid refrigerant in the high

A

pressure side of mechanism.HIGH

260
Q

VACUUM PUMP

A

Mechanism which can create a vacuum in the 1000 to 1 micron range.HOT DECK

261
Q

heating section of a multizone system. HOT GAS BYPASS

A

Piping system in refrigerating unit which moves hot refrigerant gas from condenser into low

262
Q

DEFROST

A

Defrosting system in which hot refrigerant gas from the high side is directed through evaporator for short period of time and at predetermined intervals in order to remove

263
Q

frost from evaporator.HOT JUNCTION

A

That part of thermoelectric circuit which releases heat.HOT PROCESS

264
Q

temperature.HOT PROCESS PHOSPHATE SOFTENING

A

A process whereby the calcium and magnesium salts containing, constituting the hardness of water, are chemically

265
Q

precipitated and removed with phosphate in conjunction with caustic soda.HOT WELL

A

A tank used to receive condensate from various sources on its passage back to the boiler

266
Q

through a feedwater system.HOT

A

WATER HEATING BOILER

267
Q

the boiler.HOT

A

WATER RE

268
Q

CIRCULATING SYSTEM

A

A heating system using water as a heat

269
Q

Hydrogen stress cracking.HSCC

A

Hydrogen

270
Q

assisted stress

A

corrosion cracking.HUMIDIFIER

271
Q

A device to add moisture to air. HUMIDIFYING

A

Adding of moisture to the

272
Q

air.HUMIDIFYING EFFECT

A

The latent heat of vaporization of water at the average evaporating temperature times the weight of water evaporated per unit of time. HUMIDISTAT

273
Q

HUMIDITY

A

Dampness of air.

274
Q

HUMIDITY RATIO

A

The ratio of the mass of the water vapor to the mass of dry air contained in the sample.

275
Q

HUMIDITY, ABSOLUTE

A

The weight of water vapor per unit volume.

276
Q

HUMIDITY, PERCENTAGE

A

The ratio of the specific humidity.

277
Q

HUMIDITY, RELATIVE

A

The ratio of the mol fraction of water vapor present in the air, to the mol fraction of water vapor present in saturated air at the same temperature and barometric

278
Q

pressure

A

approximately, it equals the ratio of the partial pressure or density of the water vapor in the air, to the saturation pressure or density, respectively, of water vapor at the same

279
Q

HUNTING

A

A surge of engine speed to higher number of revolutions per minute, followed by a drop to normal engines speed without manual movement of the trottle. Is often caused by

280
Q

HVAC

A

Heating, Ventilating, and Air Conditioning.

281
Q

HVAC BOILER

A

Boiler for heating or air conditioning (Absorption Refrigeration)

282
Q

HVAC EQUIPMENT

A

Apparatus or equipment used in heating, ventilating, and air conditioning.

283
Q

HYDRATION

A

Absorption of water by a mineral that results in a change in the nature of the mineral.

284
Q

HYDRAULIC CLASIFICATION

A

The rearrangement of resin particles in an ion

Power Engineering Terms (5 decks)

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