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50 Cards in this Set
- Front
- Back
Water is the most common medium used to transport heat from the area to be cooled.
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True
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Some cooling systems can be designed to share components with a hot water heating system.
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True
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Chiller systems are commonly used in refinery, brewery, and dairy applications.
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True
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Heat flows from a cold material to a hot material.
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False
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Heat energy can be changed to mechanical energy.
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True
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Latent heat is the amount of heat that changes the temperature of a substance but not the state of a substance.
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False
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When refrigerant gas is compressed, the temperature and pressure are lowered.
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False
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Refrigerant is converted from a gas to a liquid in the condenser.
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True
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An absorption refrigeration system uses a compressor to provide pressurized ammonia to the system.
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False
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Refrigerant is changed from a liquid to a gas in the low pressure side of a compression system.
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True
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Latent heat is heat added to a substance that changes its state without a change in temperature.
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True
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In a compression refrigeration system, heat transfer occurs at the expansion valve and the compressor.
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False
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When ice changes into water, there is a change in state.
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True
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In a refrigeration system, heat is absorbed when a fluid changes from a liquid to a gas.
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True
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A scroll compressor has reciprocating cylinders to compress the refrigerant.
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False
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The evaporator is located on the high pressure side of a cooling system.
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False
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A refrigerant absorbs heat when changing from a liquid to a gaseous state.
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True
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Direct cooling systems are used where the space or product to be cooled is located a considerable distance from the condensing equipment.
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False
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Refrigerants used in a compression refrigeration system must have a boiling point below the temperature of the air leaving the evaporator.
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True
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If the pressure on a refrigerant increases, the boiling point decreases.
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False
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In a direct cooling system, the evaporator is in direct contact with the space or product being cooled.
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True
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Compression refrigeration systems are commonly used for air conditioning applications.
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True
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Heat is released by the refrigerant at the evaporator.
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False
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Liquid refrigerant leaves the condenser under high pressure before reaching the expansion valve.
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True
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Refrigerant pressure is controlled by the expansion valve located between the evaporator and the compressor.
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False
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In a lithium bromide and water system, heat is applied at the generator.
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True
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Indirect cooling systems use refrigerant piped to the space or product to be cooled.
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False
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Chlorofluorocarbons (CFCs) are present in all refrigerants used in compression systems.
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False
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Cooling systems use equipment similar to hot water heating systems.
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True
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Air conditioning systems are cooling systems used to cool air for comfort in building spaces.
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True
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Water chilled in a cooling system is chilled by the ___.
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chiller
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Heat added to a substance that changes its state without a change in temperature is ___ heat.
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latent
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In a(n) ___ system, water is commonly used to absorb heat from the product or space to be cooled.
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chilled water
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In a compression refrigeration system, liquid refrigerant under high pressure is allowed to drop in pressure by the ___.
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expansion valve
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Absorption refrigeration systems may use ___ as a refrigerant.
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lithium bromide and water
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Cooling units that cool building spaces are designed to ___ heat from the air.
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absorb
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In a refrigeration system, heat is ___ when a fluid changes from a gas to a liquid.
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In a refrigeration system, heat is ___ when a fluid changes from a gas to a liquid.
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In a compression refrigeration system, high pressure vapor is converted from a gas to a liquid in the ___.
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condenser
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In a compression refrigeration system, the refrigerant absorbs heat in the ___.
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evaporator
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In a lithium bromide and water refrigeration system, heat is commonly applied with steam coil at the ___.
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generator
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In a lithium bromide system, cooling water is directed through the ___ and condenser to remove heat.
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absorber
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Indirect cooling systems commonly use ___ as a medium to cool the space or product.
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chilled water
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In a compression refrigeration system, heat is absorbed by the refrigerant in the ___.
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low pressure side
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Common condenser designs include ___ condensers.
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shell-and-coil, shell-and-tube, & tube-in-tube
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In a compression refrigeration system, the ___ is used to change the pressure of a refrigerant gas.
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compressor
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The compressor will be damaged if ___ refrigerant is allowed to enter.
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liquid
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Refrigerants used in a compression system must be ___.
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noncorrosive, chemically stable, nonflammable
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An absorption refrigeration system includes all of the following except the ___.
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compressor
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_____ refrigerants do not contain chlorine and are safer for the environment.
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HFC
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In indirect cooling systems, ___ used as a medium must be kept above 32°F.
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water
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