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.
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- 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.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.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%.
- 3.13 A refrigeration plant is modeled as a closed system operating steadily between the cold space T = 280 K and the ambient at To = 300 K. The refrigeration load extracted from the cold space is QL, and the power input is W. Define the refrigerator coefficient of performance COPR and complete the inequality COPR < ?.The heat loss from a chicken coop (chicken house) is K(Tnside - Totside) during the winter, where K is 1.5 kW/K. The chicken coop temperature can vary between 15 °C and 25 °C without harming egg production. A heat pump with a coefficient of performance of 40% of that of a reversible heat pump is used to heat the chicken coop. What are the minimum power requirements if the outside temperature is -5 °C? .1. The co-efficient of performance of a Carnot refrigerator, when it extracts 8350 kJ/min from a heat source, is 5. Find power required to run the compressor. (Ans. 27.83 kW)
- 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 1.787Q1. 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…A heat engine has a solar collector receiving 600 Btu/h per square foot, insidewhich a transfer medium is heated to 800 R. The collected energy powers aheat engine that rejects heat at 100 F. If the heat engine should deliver 8500Btu/h, what is the minimum size (area) of the solar collector?
- SL-4 A reversible refrigerator is driven by a (non-reversible) heat engine with e-0.250. Both operate between two heat reservoirs at 300K and 450K. The power output of the engine is 5,000W, which is the entire power input to the refrigerator. a) Write down or calculate the magnitudes of the Wk, Qhe and Q. for one second of operation of the b) Write down or calculate the magnitudes of the Wk, Qn, and Q. for one second of operation of the refrigerator. c) Calculate the magnitudes of the Wkest, Qhnet, and Qenet for one second of operation of the system. d) Show on a diagram like the one above for problem SL-1 the energy flow for the engine and refrigerator individually on the left and the net energy flow for the engine-refrigerator system on the right. e) Does this net result violate the second law of thermodynamics? EXPLAIN your answes. 2.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.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.