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- Four methods for controlling head pressure in an air-cooled condenser are ______, ______, _______, andThe subcooling temperature in a condenser can be measured by taking the difference between the A. suction pressure converted to temperature and the boiling refrigerant. B. boiling temperature and the condensing temperature. C. condensing temperature and the leaving-refrigerant temperature. D). condensing temperature and the entering-refrigerant temperature.In an absorption chiller, _______is used to create the difference in pressures.
- In a 14 TR ammonia refrigeration plant, the condensing temperature is 250C and evaporating temperature -100C. The refrigerant ammonia is sub-cooled by 5 0C before passing through the throttle valve. The vapor leaving the evaporator is 0.97 dry. Find: 1. Coefficient of performance: and 2. Power required. Use refrigerant table for properties of ammonia at 250C and -100C.A refrigerant 22 reciprocating compressor has a capacity of 5 tons with a condensing and evaporating temperature of 40 C and 10 C. The same system was used for heat pump application operating at 50 C condensing and 0 C evaporatingFIND ENTHALPIES, SPECIFIC VOLUMEQ.2: A refrigeration system using refrigerant 22 is to have a refrigerating capacity of 80 kW. The cycle is a standard vapor-compression cycle in which the evaporating temperature 42°C. -8°C and the condensing temperature (a) Determine the volume flow of refrigerant measured in cubic is meters inlet at the to the compressor. second per (b) Calculate the power required by the compressor. (c) At the entrance to the evaporator what is the fraction of vapor in the mixture.
- Example: 100 TR refrigeration capacity of air condition plant using R134a has evaporating and condensing temperature of 0°C and 35°C respectively, the refrigerant enters with degree of super heat of 7°C. Find 1- Dryness fraction of the vapour entering the evaporato. 2- The mass flow rate of refrigerant, and 3- COP of the systemThe air outside is 40 C and 60% r.h. I want torun an air conditioner to cool it to 15 C. The deliver rate should be 1000 m^3/min. What is Q and the rate at which water condenses (if any)?What should be the percent increase of COPof a standard vapor compression refrigerationsystem when expansion of R-12 is isentropicinstead of isenthalpic process? Evaporator andcondenser temperature limits are -10°C and30°C respectively.
- A plant using R134a refrigerant has a cooling capacity of 352 kW of refrigeration. It evaporates at 0 Cand condenses at 35 C, with the 5 of superheat at the evaporator outlet and 5 K of sub-cooling at the condenser outlet. Assuming isentropic compression and ignoring pressure drops in the piping, the evaporator and condenser, determi the following; a) The refrigeration effect b) The mass flow rate of refrigerant ) The compressor power d) The rate of heatrejection at the condenser e) The COP 0 The corresponding Carnot COP g) The percentage Carnot-efficiencyA vapour absorption refrigeration system works with a generator temperature of 87⁰C, absorber temperature of 37⁰C and evaporator temperature of -13⁰C. (a) Obtain the COP of the system. (b) If the evaporator temperature falls to -18⁰C, what should be the generator temperature so that the system operates with the same COP?An ammonia simple vapor operator between evaporator and condenser temperature of 20 C and 35 C respectively. the system used introducing 5000kg of sec in 20 hours. a 100x200 mm compressor with a compressor efficiency of 80% and electric input to the motor driving the compressor is 14 kw motor efficiency is 90%, determine heat, (b) work indicated (c) brake work (d) mechanical efficiency