G) bore and stroke of compressor in mm (k) power of motor to drive the compressor
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- Why is two-stage compression popular for extra-low-temperature refrigeration systems?The defrost cycle in a domestic refrigerator may be terminated by two methods: ___and___.Q2/ A vapor-compression refrigeration system operates on the cycle. The refrigerant is tetrafluoroethane. For Evaporation T = 0°C; condensation T = 26°C; n(compressor) = 0.79; refrigeration rate = 600 kJ-s—1., determine the circulation rate of the refrigerant, the heat-transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle
- Problem 3: The high_temperature evaporator (Refrigeration capacity 5 TR) of a multi-evaporator VCR system, working with ammonia, is operating at -6°C and the low temperature evaporator (Refrigeration capacity 10 TR) is operating at -34°C. The condenser pressure is 10.99 bar. The system using individual expansion valves for each evaporator. Assuming saturated conditions at the exit of evaporators and condenser and isentropic compression: a) Find the required power input and COP if a single compressor is used. b) If individual compressors are used for both stage find the power input and COP. c) Compare both cases.2. An R22 standard refrigeration system carries a refrigerating load of 82 kW. The suction and discharge pressures of the compressor are 354.3 kPa and 1460.1 kPa respectively. The liquid refrigerant is subcooled by 4° before entering the expansion valve and the vapor is superheated by 5° before entering the compressor. The twin- cylinder, single-acting efficiency, 82%; clearance volume, 6%; and mechanical efficiency, 78% compressor operates at 1680 rpm; stroke-to-bore ratio, 1.20; actual volumetric Determine (a) mass flow rate of refrigerant in kg/s (b) mass flow rate of refrigerant per ton of refrigeration in kg/s-ton (c) work on compressor in kWPROBLEM 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?
- 1. A Freon-12 refrigerator producing a cooling effect of 20 kJ/s operates on a simple cycle with pressure limits of 1.509 bar and 9.607 bar. The vapour leaves the evaporator dry saturated and there is no undercooling. Determine the power required by the machine. If the compressor operates at 300 rpm. and has a clearance volume of 3% of stroke volume, determine the piston displacement of the compressor. For compressor assume that the expansion following the law pv13 = constant.ASSIGNMENT 3 A Standard Refrigeration system using R22 has condensing pressure of 1812.1 kPa and vaporizing pressure of 421.35 kPa. The refrigeration capacity is 28 tons. A four-cylinder, double acting compressor has the following data: shaft speed, 1800 rpm; piston speed, 342 cm/s; bore-to-stroke ratio, 1.2; 5% clearance volume Determine (a) t, h, V, S, (b) t, ha, Va, S2 .. show double interpolation (c) P,, t, h, (d) Pa ha, X. (e) Draw the ph Diagram and system diagram (f) mass flow rate of refrigerant (g) isentropic work of compressor (h) ideal coefficient of performance (i) power per ton of refrigeration (i) volume flow capacity of compressor (k) Stroke in cm of compressor (I) Bore in cm of compressor (m) Volume displacement of compressor (n) actual volumetric efficiency (0) compression ratio (p) clearance volumetric efficiency (q) mechanical efficiency of compressor if motor is 46 kw5. 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 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?a standard vapor compression refrigeration system uses ammonia as refrigerant the amount of the evaporator negative 20 degrees centigrade on the condenser pressure is 1200 kpa. the flow rate is 30 kg/min. Determine a. the tons of refrigeration b. the power required c. the COPQ2/ 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).