A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures Tc and TH, respectively.(a) If the coefficient of performance is 10 and Tc = -40°F, determine TH, in °F.(b) If Tc = 0°C and TH = 30°C, determine the coefficient of performance.(c) If Qc = 500 Btu, QH=600 Btu, and Tc = 20°F, determine TH, in °F.(d) If Tc = 50°F and TH = 100°F, determine the coefficient of performance.(e) If the coefficient of performance is 5.5 and Tc = -5°C, find TH, in °C.Part AIf the coefficient of performance is 10 and Tc = -40°F, determine TH, in °F.TH= iSave for Later°FAttempts: 0 of 4 used Submit Answer

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Answered: A reversible refrigeration cycle…

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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Ans. W12 = -1000KJ Q12 = ~-3845 KJ Q23 = ~ 667.8 KJ
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A heat pump is used to maintain the interior of a building at 21 °C. At steady state, the heat pump receives energy by heat transfer from well water at 9°C and discharges energy by heat transfer to the building at a rate of 120000 kJ/h. Over a period of 14 days, an electric meter records that 1490 kW-h of electricity is provided to the heat pump. 1. Draw a schematic diagram(s)
An air-conditioning system is shown in the figure below in which air flows over tubes carrying Refrigerant 134a. Air enters with a volumetric flow rate of (AV)1 = 190 m/min at 32°C, 1 bar, and exits at 22°C, 0.95 bar. Refrigerant enters the tubes at 5 bar with a quality of 20% and exits at 5 bar, 20°C. Air P1 = 1 bar T = 32°C = 305 K (AV), 3 Refrigerant 134a R-134a P3 = 5 bar X3 = 0.20 4 R-134a P4 = 5 bar T = 20°C Air 2+P2 = 0.95 bar T2 = 22°C = 295 K Ignoring heat transfer at the outer surface of the air conditioner, and neglecting kinetic and potential energy effects, determine at steady state: (a) the mass flow rate of the refrigerant, in kg/min. (b) the rate of heat transfer, in kJ/min, to the air from the refrigerant.
Referring to the reversible heat pump cycle shown in the figure, p₁ = 14.7 lb/in², p = 41.5 lb/in², v₁ = 12.6 ft³/lb, v4 = 6.0 ft³/lb, and the gas is air obeying the ideal gas model. Step 1 Determine TH, in °R, and the coefficient of performance. Determine TH, in °R. TH= i P4 ºR P1 V4 VI 3 Tμ V
A cycle has a qin=350Btu/lbm, and a thermal efficiency of 74%. In this case, the expected heat rejected qout is most likely: 320 Btu/lbm 90 Btu/lbm 350 Btu/lbm 260 Btu/lbm
As shown in the figure, an air conditioner operating at steady state maintains a dwelling at 70°F on a day when the outside temperature is 103.5°F. The rate of heat transfer into the dwelling through the walls and roof is 30,000 Btu/h and the net power input to the air conditioner compressor is 3.45 hp. Step 1 B Inside, 70° F Determine the coefficient of performance for the air conditioner. = Evaporator i 30,000 Btu/h Determine the coefficient of performance of the air conditioner. Determine the power input required, in hp, and the coefficient of performance for a reversible air conditioner providing the same cooling effect while operating between the same cold and hot temperatures. Refrigerant loop Compressor Outside Q + Condenser
5.7 In a continuous agitation heating tank, w=wi=200lb/min, Cp and density are constant, the volume of the heating tank V=1.63ft^3, the specific heat of the liquid is 0.32Btu/(lbF), and the density is 62.4lb/ft^3 am. The heat input Q from the heater is 1680 Btu/min, and the inflow temperature is maintained at 80F. (b) Find the response when the inlet temperature increases to 95F at any moment and the heat input decreases to 1400Btu/min at the same time.

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