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Second Sem First Sem > Heating System & Cooling System > Flashcards

Heating System & Cooling System Flashcards

1
Q

BLEED AIR HEAT SYSTEM USES _______________ IN HELICOPTER CABINS TO COMBINE BLEED AIR WITH CABIN AIR.

A

MINI-EJECTORS

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2
Q

SOME TURBINE-POWERED AIRCRAFT NOT EQUIPPED WITH AIR CYCLE SYSTEMS STILL MAKE USE OF ______________________ TO HEAT THE CABIN.

A

ENGINE COMPRESSOR BLEED AIR

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3
Q

TEMPERATURES AT HIGH ALTITUDES IN WHICH AIRCRAFT OPERATE CAN BE WELL BELOW _____.

A

0 °F

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4
Q

______________________THAT USE AIR CYCLEAIR CONDITIONING SYSTEMSMIX BLEED AIR WITH COLD AIR PRODUCED BY THE ________________________________ TO OBTAIN WARM AIR FOR THE CABIN.

A

PRESSURIZED AIRCRAFT
AIR CYCLE MACHINE EXPANSION TURBINE

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5
Q

AIRCRAFT ___________ WITH AIR CYCLE AIR CONDITIONING MAY BE HEATED BY ONE OF A FEW POSSIBLE METHODS.

A

NOT EQUIPPED

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6
Q

THE BLEED AIR IS MIXED WITH AMBIENT AIR, OR CABIN RETURN AIR, AND DISTRIBUTED THROUGHOUT THE ______________________.

A

AIRCRAFT VIA DUCTING

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7
Q

THE MIXING OF AIR CAN BE DONE IN A VARIETY OF WAYS.
4 ways

A
  1. MIXING AIR VALVES
  2. FLOW CONTROL VALVES
  3. SHUTOFF VALVES
  4. VARIOUS CONTROL VALVES CONTROLLED BY SWITCHES IN THE COCKPIT
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8
Q

OCCASIONALLY, AN _____________________ IS USED TO HEAT THE AIRCRAFT.

A

ELECTRIC HEATING DEVICE

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9
Q

ELECTRICITY FLOWING THROUGH A _______________ MAKES THE ELEMENT WARM. A FAN TO BLOW AIR OVER THE ELEMENTS AND INTO THE CABIN IS USED TO TRANSFER THE HEAT.

A

HEATING ELEMENT

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10
Q

OTHER ___________________ SIMPLY RADIATE HEAT TO WARM THE CABIN.

A

FLOOR OR SIDEWALL ELEMENTS

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11
Q

_______________________________ REQUIRE A SIGNIFICANT AMOUNT OF THE AIRCRAFT’S GENERATOR OUTPUT, WHICH IS BETTER DEDICATED TO THE OPERATION OF OTHER ELECTRICAL DEVICES. FOR THIS REASON, THEY ARE NOT VERY COMMON. HOWEVER, THEIR USE ON THE GROUND WHEN POWERED BY A GROUND ELECTRICAL POWER SOURCE PREHEATS THE CABIN BEFORE PASSENGERS BOARD AND DOES NOT TAX THE ELECTRICAL SYSTEM.

A

ELECTRIC HEATING ELEMENT HEATERS

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12
Q

MOST ________________ LIGHT AIRCRAFT USE EXHAUST SHROUD HEATING SYSTEMS TO HEAT THE CABIN.

A

SINGLE-ENGINE

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13
Q

AMBIENT AIR IS DIRECTED INTO A METAL SHROUD, OR JACKET, THAT ENCASES PART OF THE ENGINE’S_________________. THE AIR IS WARMED BY THE EXHAUST AND DIRECTED THROUGH A FIREWALL HEATER VALVE INTO THE CABIN. THIS SIMPLE SOLUTION REQUIRES NO ELECTRICAL OR ENGINE POWER AND IT MAKES USE OF HEAT THAT WOULD OTHERWISE BE WASTED.

A

EXHAUST SYSTEM

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14
Q

MOST INVOLVE PRESSURIZING THE EXHAUST SYSTEM WITH AIR, WHILE INSPECTING FOR LEAKS WITH A _________________. SOME REQUIRE THE EXHAUST TO BE REMOVED AND PRESSURIZED WHILE SUBMERGED UNDER WATER TO DETECT ANY LEAKS.

A

SOAPY SOLUTION

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15
Q

FREQUENCY OF EXHAUST HEAT LEAK DETECTION CAN BE EVERY _____ HOURS.

A

100

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16
Q

_________________ ARE SIMILAR TO EXHAUST SHROUD HEATERS IN THAT AMBIENT AIR IS HEATED AND SENT TO THE CABIN. THE SOURCE OF HEAT IN THIS CASE IS AN INDEPENDENT COMBUSTION CHAMBER LOCATED INSIDE THE CYLINDRICAL OUTER SHROUD OF THE HEATER UNIT. THE CORRECT AMOUNT OF FUEL AND AIR ARE IGNITED IN THE AIR-TIGHT INNER CHAMBER. THE EXHAUST FROM COMBUSTION IS FUNNELED OVERBOARD.

A

COMBUSTION HEATERS

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17
Q

AMBIENT AIR IS DIRECTED BETWEEN THE COMBUSTION CHAMBER AND THE OUTER SHROUD. IT ABSORBS THE COMBUSTION HEAT BY _________ AND IS CHANNELED INTO THE CABIN.

A

CONVECTION

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18
Q

5 Types of aircraft heating system

A

Bleed air systems
electric heating systems
exhaust shroud haters
combustion heaters
ventilating air system

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19
Q

A major concern of exhaust shroud heat systems is the possibility that exhaust gases could __________ the cabin air

A

Contaminate

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20
Q

Occasionally, the exhaust system is slightly modified in a shroud heat configuration. For example, an exhaust muffler may have numerous ________ attached, which increase heat transfer to the cabin air

A

welded studs

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21
Q

Regardless of age or condition, aircraft with exhaust shroud heating systems could contain a _____________________ in the cockpit

A

carbon monoxide detection device

22
Q

An aircraft ______________ is used on many small to medium sized aircraft. It is a heat source independent from the aircraft’s engine

A

Combustion heater

23
Q

Combustion heaters are manufactured by a few different companies that supply the aviation industry. The most up-to-date units have ______________ and ________________.

A

electronic ignition and temperature control switches

24
Q

______________ is the name of the air that is warmed and sent into the cabin. Typically, it comes into the combustion heater through a ram air intake.

A

Ventilating air

25
Q

When the aircraft is on the ground, a ventilating air fan controlled by a ___________________ operates to draw in the air.

A

landing gear squat switch

26
Q

Aircraft cooling systems also called _________________ are used to reduce the temperature inside an aircraft for crew and passenger comfort

A

air conditioning systems

27
Q

The two basic methods of reducing the temperature of aircraft are the _______________ and the ______________.

A

Freon Vapor-Cycle machine and the Air-Cycle Machine

28
Q

The ________________ is a closed system using the evaporation and condensation of freon to remove heat from the cabin interior

A

Vapor - cycle machine

29
Q

The ____________ uses the compression and expansion of air to lower the temperature of the cabin air

A

Air - cycle machine

30
Q

The ________ heat exchanger cools the engine/APU bleed air

A

Primary

31
Q

The _______ heat exchanger removes the heat of compression of the ACM

A

Secondary

32
Q

An air cycle machine (ACM) is the refrigeration unit of the _________________ used in pressurized gas turbine-powered aircraft. Normally an aircraft has two or three of these ACM.

A

environmental control system (ECS)

33
Q

Each ACM and its components are often referred as an _______________.

A

air conditioning pack

34
Q

The _____________________ is used in reciprocating engine powered aircraft and in smaller turboprop aircraft that do not make use of air-cycle machines to reduce the cabin interior temperature

A

vapor-cycle air-conditioning system

35
Q

The operation of ____________ is controlled by the pilot and may incorporate automatic cutout or interrupt systems

A

vapor cycle machine

36
Q

This ____________________ are used to disengage the refrigerant compressor during demand for high engine power output, such as during takeoff operations or when one engine of multi engine aircraft has failed

A

cutout and interrupt systems

37
Q

This _________ in compressor operation allows all available power to be used to maintain controllable flight

A

Interruption

38
Q

In aircraft basic science, where the nature of gases is discussed, it is shown that the temperature of a gas is _______ proportional to its pressure and volume

A

Directly

39
Q

As a liquid change to gas (or are vaporized), they absorbed heat. This heat is called the ___________

A

latent heat of vaporization

40
Q

A vapor cycle cooling system takes advantage of these laws of nature using two heat-exchangers to control the temperature of the _____ and _____

A

cockpit and cabin

41
Q

One heat exchanger works in a fashion similar to the one previously discussed, taking heat from the closed system, and is called an ________

A

evaporator

42
Q

The other heat exchanger draws heat from the air and adds it to the closed system. This heat exchanger is called a _______

A

condenser

43
Q

The cooling process starts at the _______, where the refrigerant is in a gaseous form

A

compressor

44
Q

The function of the compressor is to ______________, under pressure through the entire system as the gas enters the condenser it is drawn from the refrigerant and passed to the atmosphere

A

push the refrigerant

45
Q

A system of this type usually employs Refrigerant 12, also known as _______, as the refrigerant

A

Freon 12

46
Q

The refrigeration cycle, beginning with the _______ involves the impression of the refrigerant gas which is comparatively cold and at a low pressure as it leaves the evaporator and flows to the compressor

A

compressor

47
Q

The ________ is the source of energy required for the operation of the system

A

compressor

48
Q

From the compressor, the hot, high-pressure gas (vapor) flows into the _________, which is a heat radiator through which cool air is passed to remove heat from the vapor.

A

condenser

49
Q

The _____________ is essentially a reservoir containing a filter and a desiccant

A

receiver-dryer-filter

50
Q

A ________ is usually located on top of the receiver to allow observation of the fluid flow through the unit.

A

Sight glass

51
Q

Modern large turbine-powered aircraft make use of ______________ to adjust the temperature of the air directed into the passenger and crew compartments of these large aircraft

A

air cycle machines

52
Q

These large aircraft utilize air cycle cooling because of its simplicity, freedom from troubles and economy. In these systems, the refrigerant is ___.

A

air

Second Sem First Sem (7 decks)

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