A simple saturation cycle of refrigeration system is operating on R22. This system has an evaporator...

A simple saturation cycle of refrigeration system is operating on R22. This system has an evaporator pressure of 350 kPa, condensing pressure of 1550 kPa and a discharge temperature of 80°C. Degree of sub cooling of 8 K and degree of superheat of 5 K. Draw p – h diagram and calculate the following.

a. Refrigeration Effect.

b. Refrigerant mass flow rate, at a plant capacity of 196 kW.

c. Power input into the compressor.

d. Coefficient of performance of the plant.

e. Compressor efficiency.

f. Total heat rejection.

g. Amount of condenser water required if LMTD of the water cooled condenser is limited to 8 K and the design ambient temperature is 20°C wet bulb.

Expert Solution

samet mamat answered 3 years ago

Refrigerant 134a enters the evaporator of a refrigeration system operating at steady state at -4oC and...

Refrigerant 134a enters the evaporator of a refrigeration system operating at steady state at -4oC and a quality of 20% at a velocity of 6 m/s. At the exit, the refrigerant is a saturated vapor at -4oC. The evaporator flow channel has constant diameter of 1.7 cm. Determine the mass flow rate of the refrigerant, in kg/s, and the velocity at the exit, in m/s.

refrigerant 134a enters the evaporator of a refrigeration system operating at steady state at -12°C and...

refrigerant 134a enters the evaporator of a refrigeration system operating at steady state at -12°C and a quality of 20% at a velocity of 7 m/s. At the exit, the refrigerant is a saturated vapor at -12°C. The evaporator flow channel has constant diameter of 1.7cm. Determine the mass flow rate of the refrigerant in kg/s Determine the velocity at the exit in m/s

A vapor-compression refrigeration cycle working with R22 contains a liquid-to-suction heat exchanger.

A vapor-compression refrigeration cycle working with R22 contains a liquid-to-suction heat exchanger. The saturated liquid refrigerant at 40 ℃ leaving the condenser and enteringthe heat exchanger is used to superheat the saturated vapor refrigerant leaving the evaporator at 7 ℃ by 8 ℃. If the compressor is capable of pumping 5 1/s of vapor refrigerant measuredat the inlet to the compressor and the compression processes are considered isentropic in both cases listed below, determine; (a) The refrigerating capacity in kW,...

A single stage simple vapr compression refrigeration cycle using R12 refrigerant is operating at a condenser...

A single stage simple vapr compression refrigeration cycle using R12 refrigerant is operating at a condenser temperature of 40 degrees C and an evaporator temperature of -5 degrees C. If the compressor is a reciprocating type compressor with 4 cylinder, rotating at 1800 RPM, has a cylinder diameter of 5cm, stroke length to diameter ratio of 1.4, and clearance ratio of 5%. Assume a polytropic index to be 1.13. 1- Sketch the cycle flow diagram, and identify the states on...

A vapor-compression refrigeration cycle working with R22 contains a liquid-to-suction heat exchanger. The saturated liquid refrigerant...

A vapor-compression refrigeration cycle working with R22 contains a liquid-to-suction heat exchanger. The saturated liquid refrigerant at 40 °C leaving the condenser and entering the heat exchanger is used to superheat the saturated vapor refrigerant leaving the evaporator at 7 °C by 8 °C. If the compressor is capable of pumping 5 l/s of vapor refrigerant measured at the inlet to the compressor and the compression processes are considered isentropic in both cases listed below, determine; (a) The refrigerating capacity...

Q/ A vapor-compression refrigeration cycle working with R22 contains a liquid-to-suction heat exchanger. The saturated liquid...

Q/ A vapor-compression refrigeration cycle working with R22 contains a liquid-to-suction heat exchanger. The saturated liquid refrigerant at 40 °C leaving the condenser and entering the heat exchanger is used to superheat the saturated vapor refrigerant leaving the evaporator at 7 °C by 8 °C. If the compressor is capable of pumping 5 l/s of vapor refrigerant measured at the inlet to the compressor and the compression processes are considered isentropic in both cases listed below, determine; (a) The refrigerating...

A Food storage locker requires a refrigeration system of 42kW(12TR) capacity at an evaporator temperature of...

A Food storage locker requires a refrigeration system of 42kW(12TR) capacity at an evaporator temperature of -5°C and condenser temperature of 40°C. The refrigerant, R-12, is sub-cooled 5°C before entering the expansion valve, and the vapour is super-heated 6°C before leaving the evaporator coil. The compression of the refrigerant is isentropic. A two-cylinder vertical single acting compressor with stroke equal to 1.5 times the bore is to be used operating at 960 r.p.m. Determine (i) refrigerating effect/kg. (ii) mass of...

12-5. An air-cycle unit operating on the simple system is designed for the following conditions: 15...

12-5. An air-cycle unit operating on the simple system is designed for the following conditions: 15 lb/min of conditioned air, air entering the turbine at 60 psia, cabin pressure 14 psia, dry-air rated discharge temperature 20 F, and a turbine efficiency of 80 per cent. a. At what temperature does air enter the turbine? b. How much power does the turbine supply to the fan?

A refrigeration system is working on vapour compression cycle using R134a as refrigerant. The objective is...

A refrigeration system is working on vapour compression cycle using R134a as refrigerant. The objective is to keep the refrigerated space at temperature of 243K. The vapours enter the compressor at 0.6 bar and at 239K and after compression leaves at 12 bar and 338K. The condenser is water cooled, in which water is supplied at 291 K at mass flow rate of 15 Kg/hr. and leaves at 299K. The refrigerant leaves the condenser temperature of 315K after rejecting heat....

Statement: Selection of compressor and refrigerant for HVAC system that is operating on Vapor Compression Refrigeration...

Statement: Selection of compressor and refrigerant for HVAC system that is operating on Vapor Compression Refrigeration System. The heat load is 120,000 BTU/hr and temperature is to be maintained at space is 50C. Step 1: Select ambient and environmental conditions Step 2: Select refrigerant, preliminary calculations, use of property charts, suction discharge pressure of compressor to achieve required cooling, compressor capacity etc. Step 3: Select compressor (Stage, rpm, displacement, size etc) need detailed solution

Question