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26 Cards in this Set
- Front
- Back
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To measure the sensible heat of the air you should use a _____ bulb thermometer.
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dry
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To measure the Enthalpy or total heat content of the air you should use a _____ bulb thermometer.
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wet
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Specific Humidity of the air is also known as
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Grains of moisture
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Air is a mixture of many types of gases and is known as
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Dry air and wet air
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At sea Level, 70deg dry air is known as _____ air
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standard
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T/F Relative Humidity is a comparison of the amount of moisture in the air to the amount of moisture the air can hold at a given temp.
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true
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What is 100% humidity?
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When wet bulb,dew point temp and dry bulb temp are all the same
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the ___ ____ temp of the air is the temp at which water vapor in the air can start to condense and separates from the air.
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Dew point
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The spacific heat value of standard air is____ btu's per pouind of air per degree of change.
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.24
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When air is heated, it expands, therefore, the specific volume would_____, the specific density would______ and the Wet bulb temp would______.
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increase, decrease,increase
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one cubic foot of dry air will weigh _____ than one cubic foot of wet air.
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more
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The amount of space that one pond of air will occupy is known as ____ ____ and is measure in CU. ft/lb.
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specific volume.
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What are the two basic types of valves used on Reciprocating Compressors.
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Reed and Ring
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The function of the compressor is to take a refigerant vapor at a _____ pressure and temp and raise it to a____ pressure and temp.
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low, high
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The mechanical shaft seals are necessary for a
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open type compressor design
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Refrigeration compressors may be lubricated by either or both th____ method or the _____ method.
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splash, pump type.
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during re-expansion portion of the compressor cycle
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the discharge and suction valves are closed
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the ithe clearance volume were to be increased, what will happen to the compressor capacity?
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lower the compressor capacity
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all refrigeration compressor valves aopened and cloed by________?
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pressure difference
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Liquid slugging during the operation is
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liquid refrigerant in the compressor clearance space
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compressor Ratio for a refrigeration compressor is
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the ratio of the absolute suction pressure to the absolute dicharge pressure.
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in a full hermetic compressor style both_____ and _____ are totally enclosed
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moto,compressor
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what are the three construction styles of reciprocating compressors?
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Serviceable hermetic, welded hermetic, open type
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What are three main types of refrigeration compressors?
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Centrifugal,rotary, reciprocating.
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what is the compression ratio for r-22 lowside pressure 60.7psig, highside pressure 243.5psig?
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3.4to1
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What type of compressor valve use springs to keep the valve closed?
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Ring valve only
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