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HTM 322 | Facilities Management > Cooling Systems > Flashcards

Flashcards in Cooling Systems Deck (30)
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1

What are the components of a vapor compression cycle?

1. Compressor
2. Condenser
3. Expansion Valve
4. Evaporator

2

What is the function of a compressor?

Increase pressure

3

What is the state of the refrigerant entering and leaving the compressor?

In as a gas
Out as a gas

4

What is the function of a condenser?

Gas to a liquid

5

What is the state of the refrigerant entering and leaving the condenser? Why?

In as a gas
Out as a liquid
High pressure

6

What is the function of the expansion valve?

Reduce pressure

7

What is the state of the refrigerant entering/leaving the expansion valve?

In as a liquid
Out as a liquid

8

What is the function of the evaporator?

Liquid to gas (cooling coils)

9

What is the state of refrigerant entering/leaving the evaporator?

In liquid
Out gas
Low pressure

10

At which components of the vapor compression cycle is energy added?

Compressor and evaporator

11

At which component of the vapor compression cycle is energy removed?

Condenser

12

Does a dehumidifier tend to raise or lower the temperature of the room it is in?

Increases the air temperature because all the energy absorbed from the room at the evaporator plus the energy to run the compressor is put back into the room at the condenser

13

In which component of the vapor compression cycle is the pressure of the refrigerant high when it enters and leaves?

Condenser

14

In which component of the vapor compression cycle is the pressure of the refrigerant low when it enters/leaves?

Evaporator

15

What happens to the room temp and the components of the vapor compression cycle if the fan on the condenser of a vapor compression cycle breaks?

The temperature goes up in the room
The temperature and the pressure go up inside the system until it breaks

16

What is the best way to improve the efficiency of a vapor compression cycle?

Reduce the temperature at the condenser

17

Which uses more energy to run the condenser?

Water cooled is colder so it uses more energy

18

List the 6 components of the lithium bromide absorption cycle

1. pump
2. generator
3. condenser
4. evaporator
5. absorber
6. expansion valves

19

At what components in the lithium bromide absorption cycle is heat added to the cycle?

Generator
Absorber
Pump

20

At what components in the lithium bromide absorption cycle is the heat removed from the cycle?

Condenser
Evaporator

21

Where is the pressure high in the lithium cycle?

Pump
Generator
Condenser

22

Where is the pressure low in the lithium cycle?

Evaporator
Absorber

23

Where are the expansion valves located in the lithium cycle?

Evaporator

24

What draws water vapor from the evaporator to the absorber?

Lithium Bromide

25

What happens at the generator in the lithium cycle? What two products are generated and where does each go next?

Pressure from the evaporator is low

26

What happens in the lithium cycle absorber?

Water vapor is absorbed into the brine solutoin

27

What three components of the lithium cycle perform the same function as the compressor in the vapor cycle?

Pump
Generator
Absorber

28

What is the function of the pump?

Increase pressure

29

What is a swamp cooler used for and how does it work?

1. Cools air
2. Water is whipped or sprayed into the air. Water evaporates pulling heat from the air, lowering the air temperature

30

What is a water cooling tower used for and how does it work?

Water is pumped to the top of the tower. Water then runs down the sides. Some of the water evaporates, pulling heat from remaining water lowering its temperature