A Carnot refrigerator absorbs heat from a space at 15°C at a rate of 16000 kJ/h and rejects heat to a reservoir at 36°C. Determine theCOP of the refrigerator, the power input, in kW, and the rate of heat rejected to high-temperature reservoir, in kJ/h.36°CR15°CThe COP of the refrigerator is2.11(Round the final answer to three decimal places.) kW.The power input isThe rate of heat rejected to the high-temperature reservoir iskJ/h.

Answered: A Carnot refrigerator absorbs heat from…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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QI Two reservoirs 727 °C and 23 °C are used to operate heat engine. 50% from the power output of heat engine is employed to drive a reversed Carnot refrigerator that absorbs heat from the cooled space at -2 °C at a rate of 6.7 Kw and rejects heat to the surrounding at 200 °C. Calculate the rate of heat supplied to the heat engine.
A heat engine has a thermal efficiency of 40 percent and it produces 600 kJ of work. What is the heat input to the heat engine, in MJ? Report your answer to one decimal place.
In a refrigeration cycle, the refrigerant gains heat in the evaporator and in thesuction line. In a certain refrigeration system, R-134a gains 67.8 Britishthermal units per pound (Btu/lb) in the evaporator. It then gains 2.5 Btu/lb inthe suction line. Find in Btu/lb the total heat gained by the R-134a.
The food compartment of a refrigerator is maintained at 4°C by removing heat from it at a rate of 347 kJ/min. If the required power input to the refrigerator is 3 kW, determine the rate of heat rejection to the room that houses the refrigerator. Select one: a. 480 kJ/min b. 610 kJ/min c. 394 kJ/min d. 527 kJ/min
A heat pump with a coefficient of performance of 3.5 provides energy at an average rate of 70000 kJ/h to maintain a building at 20 °C on a day when the outside temperature is -5 °C. If the electricity costs 8.5 cents per kWh. Assume heating is 24 hours a day. (1) Determine the actual operating cost in $/day. (2) Determine the minimum theoretical operating cost in $/day.
A heat engine is a device able to transform work into heat true or false
Q1. Solve all parts Depicted in Fig. Q1 is an irreversible refrigerator whose compressor is powered by a reversible heat engine that operates between temperature extremes Thot = 473K and cold = 293 K. The refrigerator depicted uses a dichlorodifluoromethane refrigerant (Refrigerant 12) circulating by means of the compressor at mass flow rate = 0.15 kg/s. The other components of the refrigerator are two heat exchangers in the form of an evaporator and a condenser, and a throttle valve. Information recorded at the state points depicted in Fig. Q1 is as follows: State point 1: dryness fraction x₁ = 1 and temperature t₁ = 15 °C. State point 2: dryness fraction x2 = 0 and temperature t₂ = 15°C. State point 3: wet vapour at temperature t₁ = -20°C. State point 4: wet vapour at temperature t₁ = -20°C. (a) Determine the thermal efficiency NR of the reversible heat engine depicted in Fig. Q1, and consequently determine power -W4-1 supplied to the compressor given that the rate of heat supplied…
The inventor decides to lower the temperature of the low-temperature reservoir using a Carnot refrigerator. This refrigerator is powered by the heat engine itself, not an external source, consuming part of the work output of the heat engine. Let the high temperature reservoir be at Th, the original low temperature reservoir be at T₁, and the even-lower temperature achieved by the refrigerator be Tr. a) Find the ratio of the net (available) work to the heat Qh supplied by the high-temperature reservoir. [You do not need to worry about the process of lowering part of the reservoir to Tr. Assume that this has already been done, and the Carnot refrigerator only needs to remove as much heat from the T, reservoir as the heat engine is supplying.] b) It is possible to obtain a higher net efficiency this way?
I have been working on this problem for a while and keep getting wrong answers with many different meathods how do I solve for Q0 here?
A perfectly insulated cubical office with length 10 m3 has an air conditioner that cools the house to 17 °C from 38 °C within 15 min with COPref of 3. If the density of air is taken as 1.225 kg/m3 with cy=0.72 kJ/kg °C and cp = 1.0 kJ/kg °C, determine the rate of heat removal (in kW) from the house, power used by the air conditioner and the cost of electricity (in Rands) for 3 hours in a building with six similar offices at a tariff of 280 c/kWh.
A heat pump with a coefficient of performance of 3.5 provides energy at an average rate of 70,000 kJ/h to maintain a building at 20 deg C on a day when the outside temperature is -5 deg C. If electricity costs 8.5 cents per kWh, (a) determine the actual operating cost and the minimum theoretical operating cost, each in $/day. (b) compare the results of part (a) with the cost of electrical-resistance heating.
A thermal machine operates between 2 tanks at 800ºC and 20ºC; half of the power produced by this machine is used to drive a fully reversible heat pump that absorbs heat from the cold environment at 2ºC and transfers it to a house that is maintained at 22ºC. If the house loses heat at a rate of 62,000 kJ/hr, determine the minimum heat flux that must be supplied to the heat engine in kJ/hr. show step by step a) 11,565.3 kJ/hra. b) 8,406.8 KJ/hra c) 3,158.5 KJ/hra d) 6,110.9 KJ/hra d) N.A.

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