A 3 cylinder 100 x 200 mm ammonia compressor with a compression efficiency of 86% operates with a suction pressure of 291.57 kPa and a condenser pressure of 1557 kPa at 18 rps. The refrigerant cools 1.8 kg/s of water from 28 0C to 3 0C and assuming 7 % of the useful refrigerating effect is lost due to the process of cooling and h2 = 1710 kJ/kg and clearance volume is 7 %. determine: G. volume flow rate at suction H. displacement volume I. clearance volumetric efficiency J. actual volumetric efficiency

A 3 cylinder 100 x 200 mm ammonia compressor with a compression efficiency of 86% operates with a suction pressure of 291.57 kPa and a condenser pressure of 1557 kPa at 18 rps. The refrigerant cools 1.8 kg/s of water from 28 0C to 3 0C and assuming 7 % of the useful refrigerating effect is lost due to the process of cooling and h2 = 1710 kJ/kg and clearance volume is 7 %. determine: G. volume flow rate at suction H. displacement volume I. clearance volumetric efficiency J. actual volumetric efficiency

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

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 12RQ: Refrigerators currently being manufactured in the United States are using______as their refrigerant.

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A 3 cylinder 100 x 200 mm ammonia compressor with a compression efficiency of 86% operates with a suction pressure of 291.57 kPa and a condenser pressure of 1557 kPa at 18 rps. The refrigerant cools 1.8 kg/s of water from 28 0C to 3 0C and assuming 7 % of the useful refrigerating effect is lost due to the process of cooling and h2 = 1710 kJ/kg and clearance volume is 7 %. determine: (D) ideal COP (E) actual work of comprssion (F) actual COP
A 3 cylinder 100 x 200 mm ammonia compressor with a compression efficiency of 86% operates with a suction pressure of 291.57 kPa and a condenser pressure of 1557 kPa at 18 rps. The refrigerant cools 1.8 kg/s of water from 28 0C to 3 0C and assuming 7 % of the useful refrigerating effect is lost due to the process of cooling and h2 = 1710 kJ/kg and clearance volume is 7 %. determine: A. Refrigerating capacity B. mass flow of ammonia C. ideal work of compression
100 x 200 mm ammonia compressor with a compression efficiency of 82% operates with a suction pressure of 291.57 kPPa and a condenser pressure of 1203.7 kPa at 22 rps. The refrigerant cools 100 kg/min of water from 250C to 20C and assuming 5% of the useful refrigerating effect is lost due to the process of cooling, determine: a) RE in tons of refrigeration h2 = 1653 kJ/kg b) mass flow rate of ammonia c) actual work of compression kW d) find Brake work (kW) if mechanical eff is 90% e) Actual volumetric eff f) clearance volumetric eff if c=6%
The catalogue for a refrigerant 22, four-cylinder, hermetic compressor operating at 29 r/s. a condensing temperature of 40 °C and an evaporating temperature of -4 °C shows a refrigeration capacity of 96.4 kW. At this operating points the motor (whose efficiency is 90 percent) draws 28.9 kW. The bore of the cylinders is 87 mm and the piston stroke is 70 mm. The performance data are based on 8 °C of subcooling of the liquid leaving the condenser. Compute 3.1 the actual volumetric efficiency and 3.2 the compression efficiency.
Show also the P-s and T-s diagram. Catalogue data for R-134A compressor with a displacement of 75 L/s show the capacity to be 8 tons when the suction conditions are 0.1 MPa and -20°C and condensing temperature is 50°C. The refrigerant leaves the condenser as saturated liquid. Calculate the actual volumetric efficiency and the brake work of the compressor if the compressor efficiency is 70%
A 100 x 300 mm ammonia compressor with a compression efficiency of 82% operates with a suction pressure of 291.57 kPa and a condenser pressure of 1203.7 kPa at 30 rps. The refrigerant cools 100 kg/min of water from 250C to 20C and assuming 5% of the useful refrigerating effect is lost due to the process of cooling, give that, h2 = 1653 kJ/kg, h1 = 1450.22 kJ/kg, h3 = 346.614 kJ/kg, v1 = 417.477 L/kg determine: a.) RE in tons of refrigeration b.) mass flow rate of ammonia c.) actual work of compression kW d.) find Brake work (kW) if mechanical eff is 90% e.) Actual volumetric eff f.) clearance volumetric eff if c=6%
A six-cylinder refrigerant 22 compressor operating at 29 r/s indicate a refrigerating capacity of 96.4 kW and a power requirement of 28.9 kW at an evaporating temperature of 5°C and condensing temperature of 50°C. The performance data are based on 3°C liquid sub-cooling and 8°C superheating of the suction gas entering the compressor. The cylinder bore is 67 mm and the piston stroke is 57 mm. Compute (a) the clearance volumetric efficiency if the clearance volume is 4.8 percent, (b) the actual volumetric efficiency, and (c) the compression efficiency.
Can I ask for the schematic diagram of this? and also the Ts diagram and Ph diagram. Thank You! Catalogue data for R-32 compressor with a displacement of 80 L/s show the capacity to be 8 tons when the suction conditions are 0.2 MPa and -20°C and condensing temperature is 50°C. The refrigerant leaves the condenser as saturated liquid. Calculate the actual volumetric efficiency and the brake work of the compressor if the compressor efficiency is 65%.
In a refrigerator the pressure in the evaporator us 2.72 kg/cm sq. and the refrigerant entry is 0.12 dry while at the exit 0.91 dry. During the compression, the work done per kg is 17,033 kg-m/kg. Calculate the COP. The rate of refrigerant circulation is 5.64 kg/min. The given latent heat and specific volume at 2.72 kg/cm sq are 320 kcal/kg ang 0.436 cu m/kg.
An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF (-28.9oC) and a quality of 95%. The compressor discharges at a pressure of 100 psi (689.5 kPa), liquid ammonia leaves condenser at 50oF (10oC). Properties of Ammonia: At 689.6 kPa (Tsat = 13.3oC)      h = 1,568 kJ/kg; s = 5.7676 kJ/kg.K At 10oC:      hf = 246.531 kJ/kg At -28.9oC by interpolation      hf = 68.5 kJ/kg; hg = 1424.5 kJ/kg             sf = 0.49366; sg = 6.0452Find the COP. a. 4 b. 4.25 c. 5 d. 5.25
An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF (-28.9oC) and a quality of 95%. The compressor discharges at a pressure of 100 psi (689.5 kPa), liquid ammonia leaves condenser at 50oF (10oC). Properties of Ammonia: At 689.6 kPa (Tsat = 13.3oC)      h = 1,568 kJ/kg; s = 5.7676 kJ/kg.K At 10oC:      hf = 246.531 kJ/kg At -28.9oC by interpolation      hf = 68.5 kJ/kg; hg = 1424.5 kJ/kg             sf = 0.49366; sg = 6.0452Find the horsepower per ton of refrigeration. a. 1.044 b. 0.987 c. 1.404 d. 0.897
An ammonia refrigeration compressor takes its suction from the evaporator at a temperature of -20oF (-28.9oC) and a quality of 95%. The compressor discharges at a pressure of 100 psi (689.5 kPa), liquid ammonia leaves condenser at 50oF (10oC). Properties of Ammonia: At 689.6 kPa (Tsat = 13.3oC)      h = 1,568 kJ/kg; s = 5.7676 kJ/kg.K At 10oC:      hf = 246.531 kJ/kg At -28.9oC by interpolation      hf = 68.5 kJ/kg; hg = 1424.5 kJ/kg sf = 0.49366; sg = 6.0452Find the heat absorbed by the evaporator in kJ/kg.