HVAC Air Condition Esco | 100% Correct Answers | Verified | Latest 2024 Version

Heat which causes a change in temperature of a substance is called - Sensible Heat Heat added to a substance without a rise in temperature is called - Latent Heat Heat added to refrigerant in a vapor state after the evaporation process is called - Superheat A scroll compressor moved refrigerant by means of - Involute spirals The movement of heat by way of fluid is called - Convection The movement of heat through a solid object is called - Conduction The standard unit for measuring the quantity of heat in a substance - British Thermal Unit A refrigerant gives up heat when it - Condenses Why must refrigerant in the suction line be slightly warmer than the saturation temperature? - Prevent liquid slugging of compressor It is desirable for refrigerant in the suction line to be slightly superheated in order to - Insure liquid refrigerant does not enter the compressor A mechanical shaft seal is necessary on - Semi-hermetic compressor Liquid slugging is - Liquid refrigerant in the compressor clearance spaceThe clearance space in a reciprocating compressor - Varies depending on compressor speed Which of the following types of air conditioning compressors is most energy efficient - Centrifugal Which of the following represent the right order for the functions of a condenser? - De-superheat, condenses, sub-cools Refrigerant R-134a vapor enters the compressor at 124 psig, 100°f. It leaves as a liquid from the condenser sub-cooled 20°f, and the pressure will approximately - 18.4 psig There are 3 basic types of condensers, the air cooled, the water cooled, and the _______ cooled - Evaporative 10 lbs. of refrigerant passing through a water cooled condenser will lose 20 BTU's of heat per lb. If 10 lbs. of water passes through the condenser with an entering temperature of 80°f. The temperature of the water leaving the condenser is - 100°f The heat removed from the refrigerant by the condenser is - Both sensible and latent heat An energy recovery ventilator is - An air to air heat exchanger to recover heat Which of the following can NOT be used as a low ambient temperature control? - Crankcase regulating valves The state of refrigeration in the suction line should be - Low pressure/ low temperature vapor The state of refrigerant entering the condenser is - High pressure/ highly superheated vapor The evaporator - Transfers heat from the refrigerated spa