A refrigerator uses refrigerant-134a as the working fluid and follows the ideal vapor-compression refrigeration cycle with a non isentropic compressor. The refrigerant enters the evaporator at 120 kPa with a quality of 34 percent and leaves the compressor at 70°C. The compressor consumes 600 W of power. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Expansion valve (4 120 kPa x = 0.34 QH Condenser Evaporator QL Warm environment The condenser pressure is [ Cold 70°C Compressor environment Determine the condenser pressure. (Take the required values from saturated refrigerant-134a tables.) kPa.

A refrigerator uses refrigerant-134a as the working fluid and follows the ideal vapor-compression refrigeration cycle with a non isentropic compressor. The refrigerant enters the evaporator at 120 kPa with a quality of 34 percent and leaves the compressor at 70°C. The compressor consumes 600 W of power. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Expansion valve (4 120 kPa x = 0.34 QH Condenser Evaporator QL Warm environment The condenser pressure is [ Cold 70°C Compressor environment Determine the condenser pressure. (Take the required values from saturated refrigerant-134a tables.) kPa.

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

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

See similar textbooks

Similar questions

NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A refrigerator uses refrigerant-134a as the working fluid and operates on the vapor-compression refrigeration cycle. The evaporator and condenser pressures are 100 kPa and 1400 kPa, respectively. The isentropic efficiency of the compressor is 88 percent. The refrigerant enters the compressor at a rate of 0.022 kg/s superheated by 26.37°C and leaves the condenser subcooled by 4.4°C. Problem 11.021.a - Actual refrigeration cycle Determine the rate of heat removal from the refrigerated space, the rate of heat rejection from the refrigerant to the environment, the power input, and the COP. (Take the required values from saturated refrigerant-134a tables.) The rate of heat removal from the refrigerated space is kW. The rate of heat rejection from the refrigerant to the environment is kW. The power input is kW. The COP is .
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A refrigerator uses refrigerant-134a as the working fluid and operates on the vapor-compression refrigeration cycle. The evaporator and condenser pressures are 100 kPa and 1400 kPa, respectively. The isentropic efficiency of the compressor is 88 percent. The refrigerant enters the compressor at a rate of 0.022 kg/s superheated by 26.37°C and leaves the condenser subcooled by 4.4°C. Problem 11.021.b - Comparison to ideal vapor compression cycle Determine the rate of heat removal from the refrigerated space, the rate of heat rejection from the refrigerant to the environment, the power input, and the COP if the cycle is operated on the ideal vapor-compression refrigeration cycle between the same pressure limits. (Take the required values from saturated refrigerant-134a tables.) The rate of heat removal from the refrigerated space is kW. The rate of heat rejection from…
. A steady-flow Carnot refrigeration cycle uses refrigerant-134a as the working fluid. The refrigerant changes from saturated vapor to saturated liquid at 608C in the condenser as it rejects heat. The evaporator pressure is 140 kPa. Show the cycle on a T-s diagram relative to saturation lines, and determine (a) the coefficient of performance, (b) the amount of heat absorbed from the refrigerated space, and (c) the net work input.
Problem 1 (Using thermodynamic tables)A large refrigeration plant is to be maintained at -12 C. It requires refrigeration at a rate of 120 kW.The condenser of the plant is to be cooled by liquid water, which experiences a temperature rise of 10 C as it flows over the coils of the condenser. Assuming the plant operates on the ideal vapor-compression cycle using refrigerant- 134a between the pressure limits of 100 and 700 kPa, determine (a) the mass flow rate of the refrigerant, (b) the power input to the compressor, and (c) the mass flow rate of the cooling water
Problem A compression refrigeration system operating with refrigerant R-134a has two stages. The maximum system pressure is 1.4 MPa while the minimum system pressure is 0.10MPa. After leaving the condenser as a saturated liquid, the working fluid is throttled to a flash chamber operating at 0.4 MPa. The vapor from the flash chamber is mixed with the refrigerant leaving the low pressure compressor before entering the high pressure compressor. The liquid leaving the flash chamber is throttled to the evaporator pressure. Assume the refrigerant leaves the evaporator as a saturated vapor and the compressors are isentropic. First, draw the T-s diagram of the system. Then find (i) the fraction of refrigerant that leaves the flash chamber as a vapor, (in) the rate of heat removal from the refrigerated space if the mass flow rate through the condenser is 0.25 kg/s, and (ili) the coefficient of performance.
A vapor-compression refrigeration cycle with refrigerant-134a as the working fluid operates between pressure limits of 240 and 1600 kPa. The isentropic efficiency of the compressor is 78%. Determine (a) the heat absorption in the evaporator, (b) the heat rejection in the condenser, (c) the work input, and (d) the COP
If an ideal refrigeration cycle (using R-134a) operation at evaporator temperature -10 °C and Condenser temperature +30 °C, what is the dryness factor of the Refrigerant at entering evaporator?
Why is the throttling valve not replaced by an isentropic turbine in the ideal vapor-compression refrigeration cycle?
A vapor-compression refrigeration cycle with refrigerant-134a as the working fluid operates between pressure limits of 240 and 1600 kPa. The isentropic efficiency of the compressor is 78%. The refrigerant is superheated by 5.4 °C at the compressor inlet and subcooled by 5.9 °C at the exit of the condenser. Determine (a) the heat absorption in the evaporator, (b) the heat rejection in the condenser, (c) the work input, and (d) the COP. (e) Also determine all parameters if the cycle operated on the ideal vapor-compression refrigeration cycle between the same pressure limits.
An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at 15 kPa. Given 300 kW of cooling load, determine the following: 1. Construct didactic sketches, showing the operating principles of a refrigeration system.2. When you select a refrigerant for a certain application, what qualities would you look for in the refrigerant?3. Estimate the reversible COP values, if the low and high medium temperature are as for the evaporator and condenser.
A R-134A vapor refrigeration cycle cycle operates at an evaporator temperature of 20 Celsius and a condensing temperature of 35 Celsius. Determine the coefficient performance for. Ideal saturation cycle. Wet compression with saturated vapor leaving the compressor . Suction to the compressor is superheated by 7 degrees Celsius. Using this table https://www.docdroid.net/VkxK8WH/refrigerant-134a-pdf
An ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid operates between pressure limits of 200 and 1600 kPa. The refrigerant absorbs heat from a space at 3°C and rejects heat to ambient air at 27 °C. Determine (a) the heat absorbed in the evaporator and the work input, (b) the COP, (c) the exergy destruction in each component of the cycle and the total exergy destruction in the cycle, (d) the second-law efficiency of the cycle.