a. the temperatures, in °F, of the refrigerant in each evaporator. b. the power input to each compressor stage, in horsepower. c. the overall coefficient of performance.
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- A typical temperature relationship between a high-efficiency condenser and the ambient temperature is A. 10F. B. 20F. C. 30F. D. 40F.The most popular refrigerant used in the past for residential air-conditioning is R- ________.Why is two-stage compression popular for extra-low-temperature refrigeration systems?
- Why is a circulating brine system more attractive for ship refrigeration than individual evaporators?The typical temperature relationship between a standard-efficiency air-cooled condenser and the ambient temperature is A. 50F. B. 40F C. 30F. D. 20F.A. Describe the four processes, which occur in the vapor-compression-refrigeration cycle that youtested.B. How did you figure out the enthalpy at the various entry / exit stages? (I know you lookedat the chart or table provided! I understand that you may have used interpolation.) I want you toexplain briefly how you determined, what principle(s) you used to determine the enthalpy at thevarious points.Sketch a p-h diagram. On this sketch of the p-h diagram you must sketch and show SOME constanttemperature lines, constant pressure lines, constant enthalpy lines, constant entropy lines, quality factorand other significant features of the p-h diagram to show your understanding of the p-h diagram. Labelx & y axis, indicate the units, indicate the critical point. Label various regions,
- 5. 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]Additional Instructions: Define each enthalpy obtained from tables and chart and draw the p-h diagram labeling the respective evaporating and condensing pressures and temperatures in each problem. Simple Vapor Compression Refrigeration System 53 PROBLEMS (1) An ammonia vapor refrigeration cycle operates at an evaporator temperature of-16 C and a condensing temperature of 32 C. Determine the coefficient of performance (a) for an ideal saturation eycle, (b) for wet compression with saturated vapor leaving the compressor, and (c) if the vapor at suction to the compressor is superheated 6 degrees. Ans. (a) 4.50, (b) 4.70, (e) 4.28! Room sat.liquid 50C Condenser Compressor stage 2 OValve Q2- Find the coefficient of performance for the fallowing cycle and coefficient of performance of simple refrigeration cycle for same temperatures at evaporator and condenser R-134a sat. vapor -20C Flash Mixing chamber chamber Sat. liquid -20°C Compressor stage 1 O Valve Evaporator sat liquid -40C Cold space
- an ammonia system supplies chilled brine for a 10 ton load at 0F, a 2 ton load at 20F, and 4 ton load at 35F and must operate at a -10F, suction temperature. Compare the theoretical power requirements with that for three separate F-12 compressors using direct expansion. Condesing os 80 F with 10F sub-cooling, saturared vapour enters the compressor.ASAPProblem 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.