Problem 06.058 - COP of heat pump using refrigerant Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 35°C at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid. The compressor consumes 1.250 kW of power. Use data from the tables. 800 kPa x=0 Он 800 kPa 35°C Condenser Je Expansion valve Compressor Evaporator Q₁ Problem 06.058.a - COP of heat pump using refrigerant Determine the COP of the heat pump. The COP of the heat pump is Required information Problem 06.058 - COP of heat pump using refrigerant Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 35°C at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid. The compressor consumes 1.250 kW of power. Use data from the tables. 800 kPa x=0 Он 800 kPa 35°C Condenser Expansion valve Compressor Win Evaporator QL Problem 06.058.b - Rate of heat absorption of heat pump Determine the rate of heat absorption from the outside air. The rate of heat absorbed from the outside air is kW.

Problem 06.058 - COP of heat pump using refrigerant Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 35°C at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid. The compressor consumes 1.250 kW of power. Use data from the tables. 800 kPa x=0 Он 800 kPa 35°C Condenser Je Expansion valve Compressor Evaporator Q₁ Problem 06.058.a - COP of heat pump using refrigerant Determine the COP of the heat pump. The COP of the heat pump is Required information Problem 06.058 - COP of heat pump using refrigerant Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 35°C at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid. The compressor consumes 1.250 kW of power. Use data from the tables. 800 kPa x=0 Он 800 kPa 35°C Condenser Expansion valve Compressor Win Evaporator QL Problem 06.058.b - Rate of heat absorption of heat pump Determine the rate of heat absorption from the outside air. The rate of heat absorbed from the outside air is kW.

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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Condensers in these refrigerators are all_______cooled.
Problem 06.059- Mass flow rate and the heat rejected Refrigerant-134a enters the evaporator coils placed at the back of the freezer section of a household refrigerator at 100 kPa with a quality of 20 percent and leaves at 100 kPa and -26°C. The compressor consumes 600 W of power and the COP of the refrigerator is 1.250. Use data from the tables. Он 100 kPa x=0.2 Expansion valve Condenser Evaporator Compressor Win ė 100 kPa -26°C Problem 06.059.a - Refrigerant mass flow rate Determine the mass flow rate of the refrigerant. (Round the final answer to three decimal places.) The mass flow rate is kg/s.
I need help on the following question: The vapour compression cycle (picture provided), utilises the refrigerant R134a flowing at 0.05 kg s-1. Assuming that the compression is adiabatic and reversible. If the actual input power to the compressor is 2 kW, then: 1. You need to determine the theoretical input power to the compressor and the heat transfer (Φ) to theevaporator. Take the enthalpies h1, h2, and h3 to be 238.41, 263.68 and 81.5 kJ kg-1 (use the 'NH3 Refrigeration Table' where you can find online). 2. You need to determine the coefficient of performance based on your answer to the previous question (1). 3. You need to determine the compressors mechanical efficiency.
Only solve last 2 parts ok Problem 2 – Heat Pump Thermodynamic Analysis Refrigerant-134a enters the condenser of a residential heat pump at 800 kPa and 50°C at a rate of 35 L/min and leaves at 750 kPa subcooled by 3°C. The refrigerant enters the compressor at 200 kPa superheated by 3°C. Neglecting changes in kinetic and potential energy and any stray heat transfer, please answer the following.a. Create a schematic of the cycle, use the same numbers used in your textbook for the inlet and exit states of each device, and include the energy exchanges between the cycle devices and the surroundings.b. Sketch the cycle processes on a T-s diagram.c. Determine the isentropic efficiency of the compressor.d. Compute the rate of heat supplied to the heated room.e. Determine the COP of the heat pump.
Simple saturated vapour compression refrigeration system using NH3 has a capacity of 25 TR. Evaporator and condenser temperature are -5℃ and 40 ℃ respectively. Calculate: (a) Mass flow rate of refrigerant (b) COP Take cpv = 2.1897 kJ/kgK. Properties are given below
A compressor serves two evaporators, one providing 5 tons of cooling at -20 degree F and the other, 10 tons of cooling at 10F. The system is a vapor-compression refrigeration system using R-12 with the condenser pressure at 200 psia. Assume saturated conditions leaving the condenser and evaporators and isentropic compression. Determine (a) the refrigerant flow through each evaporator, (b) the R-12 state entering the compressor, and (c) the compressor power.
: Refrigerant 134a enters a compressor of a vapour compression of a refrigeration cycle at 120Kpa as a saturated vapour and leaves at 900 Kpa and 75oc. The refrigerant leaves the condenser as a saturated liquid. The rate of cooling provided by the system is 18000 Btu/hr. Determine (1) Mass flow rate of R134a (2) The Cop of the cycle (3) Also determine the Cop of the cycle if the expansion valve is replaced by an isentropic turbine. Do you recommend such a replacement for the refrigeration system? (4) Determine the Cop if the evaporator pressure is 160Kpa and otheer values remains the same. (5) Determine the Cop if the condenser pressure is 800 Kpa and other values remain the same.
The evaporator (a heat exchanger) in an A/C unit has R-410A entering at -20 °C and a quality of 30% and leaves at the same temperature and a quality of 100%. The COP of the air conditioner is known to be 1.3 and the mass flow rate is given as 0.013 kg/s. Find the power input to the cycle. (Note that, here, the evaporator is the part of the A/C unit that accepts [i.e., withdraws] heat from the room maintained at a cold temperature)
A refrigeration system with a capacity of 15 tons of refrigeration, operates at 150 kPa in the evaporator, while in the condenser it is 1100 kPa. If R-134a refrigerant is in a saturated state, calculate the theoretical power required to operate the compressor. Compressor Power. Answer in kW
A heat pump with refrigerant-134a (R-134a) as the working fluid is used to keep a space at 21 °C by absorbing heat from geothermal water that enters the evaporator at Ti,water = 60 °C at a rate of 0.067 kg/s and leaves at To,water = 40 °C. The specific heat of liquid water is 4.18 kJ/(kg∙K). Refrigerant enters the evaporator at TR-134a = 10 °C with a quality of x = 12 % and leaves at the same pressure as saturated R-134a vapor at the same temperature. The compressor consumes 1.4 kW of power. 1)Determine the mass flow rate (in kg/s) of the refrigerant. 2)Determine the rate of heat (in kW) supplied to the space. 2)Determine the COP of the heat pump. 4)Determine the ideal minimum power input (in kW) to the compressor for the same rate of heat supply
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Borgnakke and Sonntag 11.89 The air conditioner in a car uses R-134a and the compressor power input is 15 kW bringing the R-134a from 201.7 kPa to 1200 kPa by compression. The cold space is a heat exchanger that cools atmospheric air from the outside 30°C down to 10°C and blows it into the car. What is the mass flow rate of the R-134a and what is the low temperature heat transfer rate. How much is the mass flow rate of air at 10°C? Standard Refrigeration Cycle Table B.5: h, = 392.28 kJ/kg; s = 1.7319 kJ/kg K, h h, 266 kJ/kg C.V. Compressor (assume ideal)