chapter 1

Question 1

(ASHRAE)

Answer 1

American Society of Heating Refrigerating & Air conditioning Engineers

Question 2

Define air conditioning as a process of treating air so as to control simultaneously
its temperature, humidity, cleanliness and distribution to meet the condition of a
given space.

Answer 2

(ASHRAE)

Question 3

Most air conditioning systems perform the following functions:

Answer 3

1. Provide the cooling and heating energy required.
2. Condition the supply air, that is, heat or cool, humidify or dehumidify,
   clean and purify, and attenuate any objectionable noise produced by the
   HVAC&R equipment
3. Distribute the conditioned air, containing sufficient outdoor air, to the
   conditioned space
4. Control and maintain the indoor environmental parameters–such as
   temperature, humidity, cleanliness, air movement, sound level, and
   pressure differential between the conditioned space and surroundings—
   within predetermined limits

Question 4

Air conditioning systems can be classified

according to their applications as

Answer 4

(1) comfort air conditioning systems and (2) process air

conditioning systems.

Question 5

provide occupants with a comfortable

and healthy indoor environment in which to carry out their activities.

Answer 5

Comfort air conditioning systems

Question 6

provide needed indoor environmental
control for manufacturing, product storage, or other research and development
processes.

Answer 6

Process air conditioning systems

Question 7

small package type A/C units consist of
direct expansion refrigeration as cooling system, condenser fan, circulating fan,
and control system. It is understood to serve one space or many units serving
larger space.

Answer 7

Window Type Air Conditioners

Question 8

consist of outdoor unit which are typically
condenser and compressor and the indoor unit that cools air before it is supplied
to the condition space. It is usually installed inside the condition space.

Answer 8

Split Type Air Conditioners

Question 9

– consist of one indoor unit to match one outdoor

unit.

Answer 9

Single-split A/C units

Question 9

– consist of one indoor unit to match one outdoor

unit.

Answer 9

Single-split A/C units

Question 9

– consist of one indoor unit to match one outdoor

unit.

Answer 9

Single-split A/C units

Question 9

– consist of one indoor unit to match one outdoor

unit.

Answer 9

Single-split A/C units

Question 9

– consist of one indoor unit to match one outdoor

unit.

Answer 9

Single-split A/C units

Question 10

consist of two or more indoor units to

match one outdoor unit.

Answer 10

Multi-split A/C units

Question 11

– larger package type A/C and are usually installed
outside the condition space typically on the roof top of the building where it
served.

Answer 11

Roof Top Package A/C

Question 12

consist of refrigeration circuit and chilled water

circuit.

Answer 12

Chilled Water A/C units

Question 13

known as four-pipe
water system normally consist of hot water lines and the heating coils, cooled
water lines and the cooling coils, circulating pumps, air handlers, and controlling
system.

Answer 13

Combined Hot Water and Chilled Water System

Question 14

Four (4) Necessary Action to operate A/C equipment effectively:

Answer 14

1. Action to control the temperature through thermostat and controlling valves
2. Humidity control through thermostat and humidifier or duct heater
3. Action to filter air through air filtering device on Air Handling Equipment, air
   purification including air freshener.
4. Action control air motion to a given space through circulating fans and
   modulating damper.

Question 14

Four (4) Necessary Action to operate A/C equipment effectively:

Answer 14

1. Action to control the temperature through thermostat and controlling valves
2. Humidity control through thermostat and humidifier or duct heater
3. Action to filter air through air filtering device on Air Handling Equipment, air
   purification including air freshener.
4. Action control air motion to a given space through circulating fans and
   modulating damper.

Question 15

The study of properties of air and water vapor mixture.

Answer 15

Psychrometry

Question 16

It is a graphical representation of various thermodynamic properties of
moist air.
It is very useful for finding out the properties of air (which are required in
the field of air condition) and eliminate lot of calculations.

Answer 16

Psychrometric Chart

Question 17

– lines which are vertical, parallel to the ordinate and uniformly spaced.
– actual temperature of the air

Answer 17

Dry Bulb Temperature

Question 18

lines which are horizontal, parallel to the abscissa and are uniformly space.
is the expression of mass of water vapor per unit mass of dry air.

Answer 18

Specific Humidity or Humidity Ratio

Question 19

the temperature at which condensation begins if the air is cooled at constant
pressure.

Answer 19

Dew Point Temperature

Question 20

the temperature of the air if it is saturated.

Answer 20

Wet Bulb Temperature

Question 21

lines which are inclined straight lines and uniformly space as shown. These lines
are parallel to the wet bulb temperature lines and are drawn up to saturation curve

Answer 21

Enthalpy

Question 22

lines which are obliquely inclined straight lines and uniformly space as shown.
This lines are drawn up to saturation curve.

Answer 22

Specific Volume

Question 23

• lines which are curved and follow the saturation curve.

Answer 23

Relative Humidity

Question 24

The effect of this form of heat is indicated by the sense of touch or feeling. It can
be measured by means of thermometer.

Answer 24

Sensible Heat

Question 25

Is the quantity of heat which become concealed or hidden inside a body while
producing some change in the body other than an increase in temperature.

Answer 25

Latent Heat