(1) A two-stage cascade refrigeration system uses ammonia as the working substance. The evaporator is at -35°C and the high-pressure condenser is at 1514.2 kPa. The cascade condenser is a direct-contract type. The refrigeration load is 90 tons. Determine (a) the mass flow rate in the low-pressure loop, (b) the mass flow rate in the high-pressure loop, (c) the power required, (d) the COP, and (e) the quantity of the fluid entering the evaporator. Ans. (a) 0.2572 kg/s, (b) 0.341 kg/s,

(1) A two-stage cascade refrigeration system uses ammonia as the working substance. The evaporator is at -35°C and the high-pressure condenser is at 1514.2 kPa. The cascade condenser is a direct-contract type. The refrigeration load is 90 tons. Determine (a) the mass flow rate in the low-pressure loop, (b) the mass flow rate in the high-pressure loop, (c) the power required, (d) the COP, and (e) the quantity of the fluid entering the evaporator. Ans. (a) 0.2572 kg/s, (b) 0.341 kg/s,

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

Chapter47: High-pressure, Low-pressure, And Absorption Chilled-water Systems

Section: Chapter Questions

Problem 13RQ: The subcooling temperature in a condenser can be measured by taking the difference between the A....

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?
The subcooling temperature in a condenser can be measured by taking the difference between the A. suction pressure converted to temperature and the boiling refrigerant. B. boiling temperature and the condensing temperature. C. condensing temperature and the leaving-refrigerant temperature. D). condensing temperature and the entering-refrigerant temperature.
The condensing pressure is 260 psig and the condenser outlet temperature is 108F for R-22. By how many degrees is the liquid subcooled in the condenser? A. 12F B. 42F C. 7F D. 14F
What are the approximate temperature ranges tor low-, medium-, and high-temperature refrigeration applications?
Condensers in these refrigerators are all_______cooled.
Define flash gas, and explain how it applies to the net refrigeration effect of the refrigeration cycle.
Compare the standard conditions of high-efficiency and standard air-cooled condensers.
What is the common refrigerant used in absorption refrigeration machines?
Define net refrigeration effect as it applies to the refrigeration cycle.
Why is a circulating brine system more attractive for ship refrigeration than individual evaporators?
8.) Two-stage cascade refrigeration system uses R-22 as the working substance. The evaporator is at - 20C and the high pressure condenser is at 775 kPa. The cascade condenser is direct contact type. The refrigeration load is 70 tons. Determine (a) Mss flow rate in lower pressure loop (b) mass flow rate in a high pressure loop (c) COP