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- The most popular refrigerant used in the past for residential air-conditioning is R- ________.A compressor serves two evaporators, one providing 5 tons of cooling at -20 degree F and the other, 10 tons of cooling at 10F. The system is a vapor-compression refrigeration system using R-12 with the condenser pressure at 200 psia. Assume saturated conditions leaving the condenser and evaporators and isentropic compression. Determine (a) the refrigerant flow through each evaporator, (b) the R-12 state entering the compressor, and (c) the compressor power.Is it true or false for any gas? Cp - Cv = R also , the Whp = Wr + 1 for control refrigerator
- Condenser pressure is 1200 kPa, Intermediate pressure 500 kPa and evaporator pressure 200 kPa, T7 = 40 Celsius degree, system cooling load QL = 25kW, compressor isentropic efficiency 0.8. Condenser outlet is saturated liquid, evaporator outlet is saturated steam. Draw the T-s diagram, please.In a certain refrigeration system for low temperature application , a two- stage operation isdesirable which employs ammonia system that serves a 30 ton evaporator at -30 OC .The systemuses a direct contact cascade condenser and the condenser temperature is 40 OC . How muchbigger is the mass of the high pressure loop compared to the mass of the low pressure loop?A) 0.112 kg/sec B) 11.38 ??/???C) 1.56 ??/???D) 0.26 kg /secA two stage double acting compressor operating at 150 rpm takes in air at 100 kpaa, 27°c. The low pressure cylinder is 35 x 38 cm the stroke of the high pressure cylinder is 38 cm and clearance of both cylinder is 4%. Air is discharge at 385 kpaa from the LP cylinder passes through the intercooler and enters the HP cylinder at 370 kpaa, 27°c. it leaves the HP cylinder at 148 kpaa. The polytropic exponents n= 1.3 for the cylinde. Atmospheric conditions are 101.325 kpaa, 21°c. Find (a) volume of free HP cylinder. (b) diameter of HP cylinder. (c) work required for compressor.
- qThe Rheem RA1724AJ2 residential air conditioner provides 24,000Btu/hr total cooling capacity and delivers a claimed EER of 12.20 which indicates a COP of 3.57 rather than the actual refrigerant, assume that R-134a is the working fluid and that the compressor inlet and exit conditions are as shown a)What is the power (in kW) required for the specified cooling b)What is the refrigerant mass flow rate needed given the compressor inlet and exit conditions?A single-acting, single-cylinder air compressor is rated at 4.25 m3/min of air. The suction conditions are 1 atm and 27 C and discharge pressure is 1034 kPa. The compression process follows the equation PV1.35 = A. Determine the power, in kW, required to compress the air. B.)what is the engine kW power needed to drive the unit if the combined engine-compressor efficiency is 84%? C.)if the compressor is to run two-stage at optimum intercooler pressure with perfect intercooling, what will be percentage of power saved?In a refrigerant 12 system which serves a 250 kw evaporator at -30°C. The system uses two stage compression with intercooling and removal of flash gas. The condenser temp is 40°C. h2 = 357 kJ/kg, h4 = 365 kJ/kg Compute the ff:- mass flow rate at low stage compressor (m1), answer must be in kg/s- mass flow rate at high stage compressor (m3), answer must be in kg/s- low stage compressor work, answer must be in kw
- A two-stage refrigeration system operates with ammonia refrigerant flowing at the rate of 15 kg/min through the evaporator. The saturation temperature in the condenser and evaporator units have been noted to be 40⁰C and - 15⁰C respectively. If the system has intercooling by liquid refrigerant at 4.25 bar, determine (a) The capacity and COP of the system. (b) How will these parameters be affected if the compression is carried out in a single stage unit ; the operating temperature limits remaining the same? Use the p-h chart and property tables for saturated ammonia refrigerantCan you also show the plot on the chart provided? The mass flow rate of the refrigerant in a Single Stage Vapor Compression (SSVC) refrigeration system is 0.015 kg/s and the evaporating and condensing temperatures shall be -20°C and 50°C, respectively. Determine the following: (1) cooling capacity in tons, (2) work of compressor in kW, (3) COP of the system, (4) EER of the system, and (5) refrigerating efficiency. Can you also show the plot on the chart provided?PROBLEM 2Consider a Brayton refrigeration cycle where air enters the compressor at 100 kPa, 280Kand is compressed to 400 kPa. The temperature at the turbine inlet is 340K. Thecompressor and turbine have isentropic efficiencies of 70% and 80%, respectively.Questions:Determine:(a) The refrigeration capacity per unit of mass flowing.(b) The net work input.(c) The Coefficient of Performance.