FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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A refrigerator cycle uses refrigerant R-134a and operates between a low-side pressure of 1.5 Bar and high side of 10 Bar. The power input to the compressor 1.88 Kw. find the refrigerant mass flow rate, condensing heat load, and COP of this machine
A refrigeration system operates an ideal vapor compression using R-143a with an evaporator temperature of-30°C and the condenser exist temperature of 50°C and requires 75 KW motor to drive the compression. What is the cooling capacity of the refrigerator in KW? And find COP.
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- Refrigerators currently being manufactured in the United States are using______as their refrigerant.arrow_forwardIt has been suggested that a building could be heated by a refrigeration engine operating in a Carnot cycle. The engine takes heat from the outside at 280 K and delivers heat to the building a 295 K. How much work would have to be done for every kilo joule heat delivered to the building?arrow_forwardThe refrigeration system of a food production firm is run using the Reversed Carnot Cycle. The temperature of the hot refrigerant supply in the system should be 52°C, while the temperature of the sink should be -14°C. Its capacity is projected to be at least 24 tons. It's important not to disregard losses. Find and Show unit analysis and conversion: a. COP and COP of Heat Pump b. Heat rejected from the system in kW c. Network in, Hp and Energy Efficiency Ratioarrow_forward
- A reversed carnot cycle that operates between -2 degrees celsius and 50 degrees celsius needs 45 KW compressor power. Find the tons of refrigeration.arrow_forwardThe thermal efficiency of a Carnot heat engine is 30%. If the engine is reversed in operation to work as a heat pump with same operating conditions then what will be the COP for heat pump?arrow_forwardSolve fast..arrow_forward
- The first of the two heat pumps operating on the reverse Carnot cycle 0between 0C and 22oC, and the second between -18oC and 22oCis working. Find the percentage increase between the compressor powers since both are heating at the same value.arrow_forward. In an absorption type refrigerator, the heat is supplied to NH3 generator by condensing steam at 200 kPa and 90% dry. The temperature in the refrigerator is to be maintained at -5 OC. Find the maximum COP possible. If the refrigeration load is 18 tons and actual COP is 70% of the maximum COP, find the mass of steam required per hour. Assume an atmospheric temperature of 37OC.arrow_forwardCogeneration is often used where a steam supply is needed for industrial process energy. Assume a supply of 5 kg/s steam at 0.5 MPa is needed. Rather than generating this from a pump and boiler, the setup in below. is used so the supply is extracted from the high-pressure turbine. Find the power the turbine now cogenerates in this process. 2 3 HP LParrow_forward
- Find the COP of heat pump operating between 1000K and 300Karrow_forwardi need the answer quicklyarrow_forwardQ6) A refrigerator with R-12 as the working fluid has a minimum temperature of -10°C and a maximum pressure of 1 MPa. Assume an ideal refrigeration cycle. Find the specific heat transfer from the cold space and that to the hot space, and the coefficient of performance. [107 kJ/kg, 133.9 kJ/kg, 3.98]arrow_forward
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