provide solutions (7) An industrial plant has available a 4-cylinder, 76-mm boreby 102-mm stroke, 800 rpm, single-acting compressor for use withRefrigerant 12. Proposed operating conditions for the compressorare 38°C condensing temperature and 5°C evaporating temperature.It is estimated that the refrigerant will enter the expansion valveas a saturated liquid, that the vapor will leave the evaporator at atemperature of 7°C, and will enter the compressor at a temperatureof 13°C. Assume a compressor volumetric efficiency of 70 per cent.Assume frictionless flow. Calculate the refrigerating capacity inkW for a system equipped with this compressor.Ans. 40.96 kW

(7) An industrial plant has available a 4-cyl by 102-mm stroke, 800 rpm, single-acting compressor for use wit Refrigerant 12. Proposed operating conditions for the compressc are 38°C condensing temperature and 5°C evaporating temperatur It is estimated that the refrigerant will enter the expansion valw as a saturated liquid, that the vapor will leave the evaporator at temperature of 7°C, and will enter the compressor at a temperatur of 13°C. Assume a compressor volumetric efficiency of 70 per cen Assume frictionless flow. Calculate the refrigerating capacity kW for a system equipped with this compressor.

(7) An industrial plant has available a 4-cyl by 102-mm stroke, 800 rpm, single-acting compressor for use wit Refrigerant 12. Proposed operating conditions for the compressc are 38°C condensing temperature and 5°C evaporating temperatur It is estimated that the refrigerant will enter the expansion valw as a saturated liquid, that the vapor will leave the evaporator at temperature of 7°C, and will enter the compressor at a temperatur of 13°C. Assume a compressor volumetric efficiency of 70 per cen Assume frictionless flow. Calculate the refrigerating capacity kW for a system equipped with this compressor.

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 8RQ: Four methods for controlling head pressure in an air-cooled condenser are ______, ______, _______,...

See similar textbooks

Similar questions

A refrigerant 22 , four-cylinder, 85 mm x 70 mm compressor operating at 28 rev/sec, condensing temp of 38OC and an evaporating temp of-2OC carries a refrigerating load of 112 kW. The motor driving the compressor has an efficiency of 92% and draws 32.5 kW. There is a 5OC subcooling and 7OC superheating of the suction gas entering the compressor. Compute (a) the actual volumetric efficiency (b) the compression efficiency.
An industrial plant has available a 4-cylinder, 76-mm bore by 102-mm stroke, 800 rpm, single-acting compressor for use with Refrigerant 12. Proposed operating conditions for the compressor are 38°C condensing temperature and 5°C evaporating temperature. It is estimated that the refrigerant will enter the expansion valve as a saturated liquid, that the vapor will leave the evaporator at a temperature of 7°C, and will enter the compressor at a temperature of 13°C. Assume a compressor volumetric efficiency of 70 per cent. Assume frictionless flow. Calculate the refrigerating capacity in kW for a system equipped with this compressor. Ans. 40.96 kW
Determine the total power required for individual compressors for evaporator loads of 20 tons at 24ᵒF, 30 tons at 34ᵒF and 10 tons at 44ᵒF for an ammonia vapor compression system. Condensing temperature is 104 ᵒF. Two flash tank intercooler were used.
An industrial plant has available a 4 cylinder, 6 - mm bore by 2 - mm stroke, 800 rpm, single-acting compressor for use with Refrigerant 12. Proposed operating conditions for the compressor are 38 degrees * C condensing temperature and 5 degrees * C evaporating temperature. It is estimated that the refrigerant will enter the expansion valve as a saturated liquid, that the vapor will leave the evaporator at a temperature of 7 degrees * C and will enter the compressor at a temperature of 13 degrees * C . Assume a compressor volumetric efficiency of 70%. Assume frictionless flow. Calculate the refrigerating capacity in kW for a system equipped with this compressor.
An industrial plant has available a 4 cylinder, 76-mm bore by 102-mm stroke, 800 rpm, single-acting compressor for use with Refrigerant 12. Proposed operating conditions for the compressor are 38 degrees * C condensing temperature and 5 degrees * C evaporating temperature. It is estimated that the refrigerant will enter the expansion valve as a saturated liquid, that the vapor will leave the evaporator at a temperature of 7 degrees * C and will enter the compressor at a temperature of 13 degrees * C . Assume a compressor volumetric efficiency of 70%. Assume frictionless flow. Calculate the refrigerating capacity in kW for a system equipped with this compressor.
A 140 mm x 140 mm single effect , twin -cylinder , single acting Freon 12 compressorwith a refrigeration capacity of 40 Kw operates between a discharge pressure of 1300 KPa and asuction pressure of 350 KPa . The speed of the compressor is 600 rpm . If the discharge pressureshall be raised to 1400 KPa , at what speed (rpm) should the compressor be run to produce thesame refrigeration capacity and assuming the volumetric efficiency to remain the same ?A) 613 C) 630B) 621 D) 650
an ammonia refrigeration system has a capacity of 210 kw at an evaporation temperature of - 20F when the condensing pressure is 1431 kpa (a) compute the power requirement for a system with a single compression. (b) compute the power requirement by the two compressor in the system shown below
derive the general formula for the intercooling related to the number of stage of compressor
3.) An ammonia compressor operates at evaporator pressure of 316.02 kPa and a condenser pressure of 1557 kPa. A twin-cylinder compressor with bore to stroke ratio of 0.85 is to used at 1200 rpm. The actual volumetric efficiency is 92% and compression and mechanical efficiency is 78% and 80% respectively. For a cooling capacity of 25 TR, (a) the sketch the p-h diagram labeling the evaporating and condensing temperature and pressures (b) define the all properties of ammonia taken from saturation table. Determine (c) the quantity of cooling water in the condenser in kg/min if the increase in temperature is 8°C, (d) the bore and stroke expressed in cm and (e) the size of the driving motor in hp. Given: h2 = h at 1557 kPa and s2 = s1 1695 kJ/kg
1) A singe acting, twin cylinder, ammonia compressor with bore equal to stroke is driven by an engine at 250 rpm. The machine is installed in a chilling plant to generate 700 kW of refrigeration at -18C evaporating temperature. At this temperature, the cooling effect per kg mass is 1160 kJ. The sp volume of vapor entering the compressor is 0.592 m³/kg. Assume 85% volumetric efficiency. Calculate the bore in mm.
b. A refrigerating system using Freon-12 has an evaporator saturation temperature of - 25°C and a condenser saturation temperature of 35°C. The vapor is dry saturated at entry to the compressor and has a temperature of 65°C after compression to the condenser pressure. There is no undercooling of the liquid in the condenser. i. Calculate the input power required by the compressor per kW of refrigeration. ii. Calculate the COPRef of the refrigerating system. ii. Show the operating cycle of the refrigerating system on a T-s diagram.
A two-stage R-22 system uses flash-gas remoal and intercooling as in the previous problem. The evaporating temperature is -40 C and the condensing temperature is 30 C. The pumping capacity of the high and low stage compressors is shown below: (from picture solve a and b)