Q21 Carnot cycle refrigerator transfers Q₁ = 30 kW to the atmosphere at 35 °C. The lowtemperature is T₁ = 5 °C. Find1- The coefficient of performance COP of the refrigerator.2- The Heat removal inside the refrigerator QL.3- The power required to operate the refrigerator Win.4- The thermal efficiency of the refrigerator.112(6 marks)P₂

Given:Heat absorbed from the atmosphere, QH = 30 kWHigh temperature, TH=35∘C=308KLow…

Answered: Q21 Carnot cycle refrigerator transfers…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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Q21 Carnot cycle refrigerator transfers QH = 30 kW to the atmosphere at 35 °C. The low temperature is T₁ =5 °C. Find 1- The coefficient of performance COP of the refrigerator. (6 marks) 2- The Heat removal inside the refrigerator QL. 3- The power required to operate the refrigerator Win.
refrigerator. It is given that Q2 + Q4 3 Q1. Calculate the C.O.P. of the .refrigerator In figure shown, (E) is a heat engine with efficiency of 0.4 and ( R) is a Q3 Q1 Q2 C.O.P-5.00 O C.O.P=5.50 C.O.P=5.05 O C.O.P=5.55 O R.
Question 2. A household with electric resistance heating plans to switch from resistive heating to a ground source heat pump. Annual heat consumption of the house is 30 000 kWh. Investment cost of the heat pump is 21 000 €. Heat pumps COP is 4.0. How much are the annual savings compared to resistive heating after the change of the heating system (in kWh)? Average price of electricity is assumed to be 12 c/kWh. Round off your answer to one decimal digit and enter it without the unit.
Air refrigeration works between the pressure limits of 1 bar and 5 bar. The temperature of air entering thecompressor and expansion cylinder are 100C and 250C respectively. The expansion and compression follow thelaw pv1.3=Constant. Find the following:• The theoretical C.O.P of the refrigerating cycle.• If the load on the refrigerating machine is 10 tons, then find the amount of air circulated per minutethrough the system. Assuming the actual C.O.P is 50% of the theoretical C.O.P.• Length and diameter of the single acting compressor runs at 300 r.p.m and the volumetric efficiency is85%.
In an absorption refrigerator, the energy driving the process is sllPplied not as work, but as heat from a gas flame. (Such refrigerators commonly use propane as fuel, and are used in locations where electricity is unavailable. *) Let us define the following symbols, all taken to be positive by definition: Qf = heat input from flame Qe = heat extracted from inside refrigerator Qr = waste heat expelled to room Tf = temperature of flame Te temperature inside refrigerator Tr = room temperature Use the second law of thermodynamics to derive an upper limit on the COP, in terms of the temperatures Tf, Te, and Tr alone.
In an absorption refrigerator, the energy driving the process is sllPplied not as work, but as heat from a gas flame. (Such refrigerators commonly use propane as fuel, and are used in locations where electricity is unavailable. *) Let us define the following symbols, all taken to be positive by definition: Qf = heat input from flame Qe = heat extracted from inside refrigerator Qr = waste heat expelled to room Tf = temperature of flame Te temperature inside refrigerator Tr = room temperature Explain why the "coefficient of performance" (COP) for an absorption refrigerator should be defined as Qc/Qf.
Hi I need help with a thermo review question- thank you! A refrigerator transfers 6 kW of heat from the cold space at 277 K and transfers 10kW of heat to the surroundings at 300 K. a) Determine the Rate of Work input required (kW). b) Determine the Refrigerator Coefficient of Performance c) Determine the Coefficient of Performance if it’s a Carnot Refrigerator
Question 10 Consider a residential heat pump use to maintain the inside air temperature of the house at 23C. Assuming Carnot assumptions, estimate the minimum power requirements (kW) if the outside temperature is OC and the house requires 1 kW of heating per temperature difference between the indoors and the outdoors temperatures (C). 2.392 12.87 1.163 1.787
A refrigerator has a coefficient of performance equal to 7. If the refrigerator absorbs 137.5 J of thermal energy from a cold reservoir in each cycle, find a. the work done in each cycle in Joules, and b. the thermal energy expelled to the hot reservoir in Joules.
5. A 2000-KW diesel engine unit uses 1 US barrel (bbl) of oil per 525 kW-h produced. Oil is 25°API. Efficiency of generator is 93% and mechanical efficiency is 80%. The thermal efficiency based on indicated power is %.
27. If the system shown below is used to run a refrigerator, which of the following is true for the x to z step? pressure volume y Z A. The work is negative and heat is added to the system B. The work is positive and heat is added to the system C. The work is negative and heat is removed from the system D. The work is positive and heat is removed from the system 28. Refer to the y to z step in the PV diagram of the previous question. If heat was added to the system, which of the following must also be true? A. W 0 C. W = 0, and AU = 0 D. W = 0, and AU 0, and AU = 0
Q1. (Reading: Çengel and Boles, Thermodynamics: An Engineering Approach, 8th Ed., Pages 307-311) The amount of energy waste by a refrigerator increases by a number of malpractices. For example; opening the refrigerator door frequently will increase energy waste as the warmer air outside replaces the cool air inside. It is also not recommended to place the hot foods into the refrigerator before cooling them to the room temperature. Imagine a typical household refrigerator with an internal temperature of 4 °C. The refrigerator has a coefficient of performance of 1.4. The internal dimensions of this refrigerator are 186 cm (height) x 84 cm (width) x 75 cm (depth). The half of the refrigerator volume is used for storing food items. The air filling the other half of the refrigator volume contains 0.004 kg moisture/kg air on average. While the moisture content of the air in the kitchen is 0.01 kg/kg air, the temperature and pressure in the kitchen are 23°C and 97 kPa, respectively. Assuming…

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