16. Refrigerant: R-22 Required Subcooling: 8 degrees High side pressure: 155 High side temperature: 75 degrees Subcooling:
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- Q2/ A refrigerator with tetrafluoroethane (R-134a) as refrigerant operate with an evaporation temperature of -34 °C and a condensation temperature of 18 °C. Saturated liquid refrigerant from the condenser flows through an expansion valve into the evaporator, from which it emerges as saturated vapor. What is the coefficient of performance (COP) of the refrigerator? (Note: The cycle is vapor compression cycle).3. When subcooling the liquid refrigerant:a. the refrigerating effect per unit mass increases. b. the mass rate of flow per unit capacity decreases. c. the volume flow rate per unit capacity decreases. d. the work of compression per unit mass remain the same. e. the COP increases. f. the theoretical power per unit capacity decreases. A simple saturated refrigeration cycle for R-12 system operates at an evaporating temperature of - 5oC and condensing temperature of 40oC. Show the effect from a to f if the liquid refrigerant is subcooled to 30 oC.The values of a vapor compression refrigeration cycle were given below. Calculate the values ofrefrigerant flow rate, refrigeration capacity, and the COP of the system.T1= Evaporator water outlet = 10 °CT2= Evaporator water inlet = 16 °CT3= Condenser water inlet = 16 °CT4= Condenser water outlet = 22°CCooling water flow rate = 1.5 L/minHeating water flow rate = 1.5 L/minEnthalpy of R134a in evaporator outlet = 305 kj/kg,Enthalpy of R134a in evaporator inlet =115 kj/kgEnthalpy of R134a in condenser inlet =327 kj/kg
- The most popular refrigerant used in the past for residential air-conditioning is R- ________.Given: Qref тс Te Refrigerant Required: main E.V. I TOR with Flash Tank- intercooler, I pouble-stage compressor. Flash tan Intercooler -mv A сор 30°C - 20°C = R 1349 COMPENSER (B) → MR Evaporator High Pressure Compressor mv low-press me compressorvapour compression refrigerator operates between the pressure limits of 462.4 kN/m² and 1785.9 kN/m². At entry to compressor the refrigerant is dry saturated and after compression it has a temperature of 59°C. The compressor has boreand stroke of 75 mm and runs at 8 rev/sec. With volumetric efficiency of 30% The temperature of the liq. refrigerant as it leaves the condenser is 32°C and specific heat capacity of the super heated vapour may be assumed constant. Determine (1) The coefficiency of performance of refrigerator. (1) The mass flow of the refrigerant in kg/hr.
- 7. A residential heat pump system operating at steady state is shown in the figure. Refrigerant 134a circulates through the components of the system, and the property data at the numbered locations are given on the figure. The mass flow rate of the refrigerant is 4.6 kg/min. Kinetic and potential energy effects are negligible. Determine (a) Rate of heat transfer between the compressor and the surroundings, in kJ/min. (b) Coefficient of performance5. A refrigeration system using R-12 as refrigerant consists of throe evaporators of capacities 20 TR at – 5°C, 30 TR at 0°C and 10 TR at 5°C. The vapours leaving the three evaporators are dry and saturated. The system is provided with individual compressors and multiple expansion valves. The condenser temperature is 40°C and the liquid refrigerant leaving the condenser is saturatoed. Assuming isentropic compression in each compressor, find (a) the mass of refrigerant flowing through cach evaporator, (b) the power required to drive the system, and (c) the C.O.P. of the system. [Ans. 27.4 kg/min, 42.25 kg/min: 34.12 kg/min; 38.4 kW; 5.56]PROBLEM 1: A 20-ton vapor compression refrigeration system is to evaporate R-12 at -20°C and to condense it at 40°C. The vertical compressor is to run at 10000 rpm; it is single acting, has the bore equal to the stroke, and has 5% clearance. Vapor enters the compressor at -10°C and liquid enters the expansion valve at 30°C. 1.1 What refrigeration flow rate is required? 1.2 What would be the bore and stroke of the compressor? 1.3 What power is required by the compressor? 1.4 What is the quantity of the cooling water required in the condenser for a 8-degree increase in temperature?
- Problem 6 The refrigeration system using R-22 refrigerant consists of 3 evaporators of capacities 30 ŤR, 20 TR and 10 TR with individual expansion temperature in the 3 evaporators is to be maintained at -10°C, 5ºC and 10°C respectively. The vapor leaving the evaporator is dry and saturated. The condenser temperature is 40°C and the liquid refrigerant leaving the condenser is sub cooled to 30°C. Assuming isentropic compression, find: a) Mass of refrigerant flowing through each evaporator, b) Power required to drive the system and c) COP of the system. as valves and compressors. ThePROBLEM 1: A 50-ton vapor compression refrigeration system is to evaporate R-12 at -20°C and to condense it at 40°C. The vertical compressor is to run at 10000 rpm; it is double acting, has the bore equal to the stroke, and has 10% clearance. Vapor enters the compressor at -10°C and liquid enters the expansion valve at 30°C. 1.1 What refrigeration flow rate is required? 1.2 What would be the bore and stroke of the compressor? 1.3 What power is required by the compressor? 1.4 What is the quantity of the cooling water required in the condenser for a 8-degree increase in temperature?Draw the Ts/Ph Diagram A 50-ton vapor compression refrigeration system is to evaporate R-12 at -20°C and to condense it at 40°C. The vertical compressor is to run at 10000 rpm; it is double acting, has the bore equal to the stroke, and has 10% clearance. Vapor enters the compressor at -10°C and liquid enters the expansion valve at 30°C. What refrigeration flow rate is required? What would be the bore and stroke of the compressor? What power is required by the compressor? What is the quantity of the cooling water required in the condenser for a 8-degree increase in temperature?