An R-22 vapor compression system utilizes liquid to suction heat exchanger in the system. The condenser pressure is 1191.90 kPa and the evaporator pressure is 354.30 kPa. The heat exchanger warms the refrigerant from the evaporator to 5OC. If the compression is isentropic, calculate the COP. Calculate: (a) the mass of refrigerant flow;(b) the refrigerating capacity if the compressor draws in 12 liters per second of R-22; (c)the compressor work and (d) the amount of cooling water in the condenser in kg/hr if ∆t of water is 10OC

An R-22 vapor compression system utilizes liquid to suction heat exchanger in the system. The condenser pressure is 1191.90 kPa and the evaporator pressure is 354.30 kPa. The heat exchanger warms the refrigerant from the evaporator to 5OC. If the compression is isentropic, calculate the COP. Calculate: (a) the mass of refrigerant flow;(b) the refrigerating capacity if the compressor draws in 12 liters per second of R-22; (c)the compressor work and (d) the amount of cooling water in the condenser in kg/hr if ∆t of water is 10OC

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

See similar textbooks

Similar questions

When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.
Why is two-stage compression popular for extra-low-temperature refrigeration systems?
Welded ______sealed compressors are normally used in household refrigerators.
A refrigerant 22 vapor compression system includes a liquid-to-suction heat exchanger in the system. The heat exchanger cools the saturated liquid from the condenser from 32°C to 21°C with vapor which comes from the evaporator at -10°C. The compressor is capable of pumping 20 L/sec of refrigerant. What is the enthalpy of the refrigerant at the suction of the compressor neglecting the heat exchanger? What is the isenthalpic value of the refrigerant in the system neglecting the heat exchanger? What is the refrigerant's enthalpy after compression? What is the COP of the system neglecting the heat exchanger? What is the enthalpy of the refrigerant before it enters in the expansion valve? What is the approximate enthalpy of the refrigerant at the suction of the compressor? What is the estimated enthalpy of the refrigerant after compression? What is the COP of the system? What is the refrigerating capacity of the system in TOR if: a.) without hex and b.) with hex?
A refrigerant 22 vapor compression system includes a liquid-to-suction heat exchanger in the system. The heat exchanger cools the saturated liquid from the condenser from 32 deg C to 21 deg C with vapor which comes from the evaporator at -10 deg C. The compressor is capable of pumping 20 L/sec of refrigerant. What is the enthalpy of the refrigerant at the suction of the compressor neglecting the heat exchanger? What is the isenthalpic value of the refrigerant in the system neglecting the heat exchanger? What is the refrigerant's enthalpy after compression? What is the COP of the system neglecting the heat exchanger? What is the enthalpy of the refrigerant before it enters in the expansion valve? What is the approximate enthalpy of the refrigerant at the suction of the compressor? What is the estimated enthalpy of the refrigerant after compression? What is the COP of the system? What is the refrigerating capacity of the system in TOR if: a.) without hex and b.) with hex?
A food storage locker requires a refrigeration system of 2,400 kJ/min capacity at an evaporator temperature of -10OC and a condenser temperature of 30OC. The refrigerant used is freon-12 and sub-cooled by 6OC before entering the expansion valve and vapor is superheated by 7OC before leaving the evaporator coil. The compression of refrigerant is isentropic. The refrigeration compressor is two-cylinder, single-acting with stroke equal to 1.25 times the bore diameter and operates at 1000 rpm. Determine: (a) refrigerating effect, (b) mass of refrigerant to be circulated, (c) theoretical piston displacement per minute, (d) theoretical power to run the compressor in kW, (e) heat removed from the condenser per min. (f) theoretical bore and stroke of compressor.
vi) The vapour-compression heat pump system below uses a heat exchanger to superheat the vapour entering the compressor while sub-cooling the liquid exiting the condenser. The refrigerant used (R134a) is at -10.1°C in the evaporator and is sub-cooled by 11.3°C at the throttle valve entrance. If the condenser pressure is 800 kPa, the maximum temperature reached by the refrigerant throughout the cycle is closest to: Condenser Compressor Heat exchanger Throttle Evaporator work ratin n
A R134a vapour compression system includes a liquid suction heat exchanger in the system. The heat exchanger cools saturated liquid coming from the condenser from 31.31OC to 20OC with vapour which comes from the evaporator at –10.09OC. If the compressor is capable of pumping 20 L/s measured at the compressor suction, calculate (a) the COP of the system, (b) the cooling load, TOR, and (c) the work of compression, KW.
A vapor-compression refrigeration system uses R-134a. The evaporator pressure is 200.60 kPa and a condenser pressure of 770.20 kPa. The refrigerant enters the compressor as a saturated vapor and leaves the condenser as subcooled liquid at 20°C (there is subcooling from Tsatn to 20°C). Calculate the following: (a) The flowrate of R-134a in kg/s, if the refrigeration capacity is 35.5 kw (b) Work requirement in the compressor in kl/kg, if the compressor efficiency is 0.80 (c) COP of the refrigeration cycle. (d) Provide the P-H diagram of the cycle.
3. A vapour compression refrigeration system of 2400 kJ/min capacity works at an evaporator temperature of 263 K and a condenser temperature of 303 K. The refrigerant used is R-12 and is subcooled by 6°C before entering the expansion valve and vapour is superheated by 7°C before leaving the evaporator coil. The compression of refrigerant is reversible adiabatic. The refrigeration compressor is two-cylinder, single acting with stroke equal to 1.25 times the bore and runs at 1000 r.p.m. Determine: 1. Refrigerating effect per kg ; 2. Mass of refrigerant circulated per minute ; 3. Theoretical piston displacement per minute; 4. Power required to run the com pressor; 5. Heat removed in through condenser; and 6. Bore and stroke of the compressor.
The mass Q3// The Lithium bromide (Li Br) - water absorption refrigeration system as flow rate delivered by the solution pump is 0.4 kg/s. The temperatures in the: generator = 105 °C; condenser = 35 °C; evaporator = 5°C; and absorber = 30 °C. Determine: - 1- The mass flow rates of solution returning from the generator to the absorber 2- The mass flow rate of refrigerant flowing in the condenser. 3- The amount of heat in each component. 4- The COP.
An ideal vapor compression cycle operates between the temperature limits of -5 °c and 30 °C and uses R134a as the refrigerant, which flows at a rate of 0.6 kg/s. The P-h- as well as T-s-diagrams that illustrate the refrigerating process is given in diagram, and respectively. Refigerant is compressed to the state in the compressor and heat is rejected in the condenser at constant for ideal Vapour compression cycle.