A refrigerant 22 reciprocating compressor has a capacity of 5 tons with a condensing and evaporating temperature of 40 C and 10 C.
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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 evaporating
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- Two methods used to power refrigeration compressors on a ship are _____and ____.Q.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.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-efficiency
- 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.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.The 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)?
- 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 efficiencyExample: 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 systemIn a 14 TR ammonia refrigeration plant, the condensing temperature is 250C and evaporating temperature -100C. The refrigerant ammonia is sub-cooled by 5 OC before passing through the throttle valve. The vapor leaving the evaporator is 0.97 dry. Find: 1. Coefficient of performance: and 2. Power required.
- A vapour compression refrigerator working with Freon-12 has its temperature range -10°C and 30°C. The Vapour enters the compressor dry and under cooled by 5°C in the condenser. For a capacity of 15 TOR, find: C.O.P Entropy Temp °C 30 -10 Enthalpy hf 64.59 26.87 Hfg 135.03 156.31 ng 199.62 183.19 Sf 0.24 0.108 Sg 0.6853 0.7019Condenser 30 c „Flash Chamber Pi Evaporator OC & 50 kW For a 2-stage ammonia compression system, determine: 1. Draw the PH diagram showing the condenser, evaporator, & compressor discharge temps, intercooler pressure, all enthalpies & compressor suction specific volumes, m/kg 2. Compute the intercooler pressure in Bars & equivalent Ti in °C 3. Compressor discharge temps T: & T4 4. Mass of refrigerants m:, ms & m: in kg/sec 5. Compressor power Wi, W & total W- in kW & HP 6. Compressors PD with equal volumetric efficiency 80%; m/s 7. Condenser capacity, kW 8. Using a single stage compression, calculate & compare the power of the compressor/s in kW & HP9. A 9.5 tonnes capacity of ammonia refrigerator operates between evaporator and condenser temperature of -13°C and 28°C is needed in a food storage locker. The refrigerant is sub-cooled by 4°C before entering the expansion valve. The vapour is 0.90 dry as it leaves the evaporator coil. The compression in the compressor is adiabatic type. Using p-h chart find (i) Condition of vapour at outlet of the compressor (ii) Condition of vapour at entrance to evaporator (iii) С.О.Р. (iv) Power required in kW Neglect valve throttling and clearance effect.