3. A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures TC and TH, respectively.(a) If the coefficient of performance is 3.5 and TC = -40 deg F,determine TH, in deg F.(b) If TC = -30 deg C and TH = 30 deg C, determine the coefficientof performance.(C) If QC = 500 Btu, QH = 800 Btu, and TC = 20 deg F, determineTH, in deg F.(d) If TC = 30 deg Fand TH = 100 deg F, determine the coefficientof performance.(e) If the coefficient of performance is 8.9 and TC = -5 deg C,find TH, in deg C.

As per our guidelines we are supposed to solve only 3 subparts if multiple subparts are asked .…

Answered: 3. 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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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- -30°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-30°F and TH-100°F, determine the coefficient of performance. (e) If the coefficient of performance is 8.9 and Te--5°C, find TH, in °C.
A reversible heat pump cycle operates at steady state between hot and cold reservoirs at TH = 30°C and Tc 10°C, respectively. The rate of heat transfer at the high temperature is 10 kW. a. Determine the net power input, in kW. b. Determine the heat transfer rate from the cold reservoir at Tc, in kW. c. Determine the coefficient of performance of the cycle.
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
CO2 enters a compressor at 1 bar, 34 ° C, with a velocity of 28.4 m / s through a 150 mm diameter pipe located 7 m below the discharge line and exits at 8 bar and 265 ° C through a 120 mm diameter pipe. The heat losses are 4.5 kJ / kg. It is asked to calculate:Data: CP = 0.85 kJ / kg. °C Molar mass = 44 Local electricity tariff = S /. 0.2780 / kWh a) The velocity of the gas at the outlet, in m / sb) The mechanical power (shaft), if the compression efficiency is 78%, in kWc) If the compressor must deliver 15,000 m3 of compressed air per day, continuously, what consumption (kWh) and what monthly cost (S /.) Does this compressor originate, if the efficiency of its motor is 80%?
-Gas supply line- Gas A 1.5 m3 tank initially contains a gas at 140 kPa, 340 K. The tank is connected a line carrying same gas at 1400 kPa and 340 K. What should be heat transfer during this process, in kJ, so that the final pressure and temperature are 1400 kPa and 340 K, respectively. (cp=0.72 kJ/kg.K, cv=0.48 kJ/kg.K).
3.14 A heat-driven refrigeration plant operates steadily as a closed system. There is no mechanical power input or output. The refrigeration load extracted from T, = 280 K is O1. The plant receives the heat input QH from the high temperature TH = 1000 K. The plant rejects Qo to the ambient at To = 300 K. The efficiency of this power plant is defined as n = OL/ÕH• Complete the inequality n < ?.
4. Two and one-half pounds of air actuate a cycle composed of the following processes: polytropic compression 1-2, with n = volume 3-1. The known data are: D1 = 20 psia, ti = 100°F, Qr = -1682 Btu. Determine (a) T2 nd Ts, (b) the work of the cycle using the pV plane, in Btu; (c) Qu (d) the thermal 1.5; constant pressure 2-3; constant efficiency, and (e) pn. Ans. (a) 1120°R, 4485°R; (b) 384.4 Btu; (c) 2067 Btu; (d) 18.60%: (e) 106.8 psia
Question 2
10. A thermodynamic cycle using water is shown on the T-s diagram of Figure 7.26. Calculate the coefficient of performance for this cycle using the equation h, – h, COP = (h, – he) – (h, – hɔ) State A State B State C State D X = 1.00 P = 300. psia X = 0.00 Po = 10.0 psia P = 10.0 psia The processes are A → B = isentropic compression, B → C = isobaric expansion, C →D= isentropic expansion, D - A = isothermal compression. FIGURE 7.26
The manufacturer of the device claims that it accepts a heat transfer at a rate of QH = 3.0 kW from a low-grade source of geothermal heat at TH = 80ºC and rejects heat at rate QC to the atmosphere at TC = 20ºC. The device operates at steady state and produced work at a rate of W= 2.5 kW. There are no other heat or work transfers from the device. a.) What is the rate at which the device rejects heat to the atmosphere, QC ? b.) Is this device possible? Justify your answer using an entropy balance.
a) A refrigeration cycle is chosen to maintain a freezer compartment at 10.0°F in a room that is at 90.0°F. If 200. Btu/min are extracted from the freezer compartment by heat transfer and the freezer is driven by a 1.00 hp electric motor, determine the dimensionless coefficient of performance (COP)of the unit, defined as the cooling rate divided by the input power. b) Determine the energy transport rate for the system shown in Figure below. Fuel flow Top heat loss Exhaust flow Epuet=15,000 Btu/min 180,000 Btu/h Ecshaut =500. Btu/min System boundary Engine-generator set 200. hp Bottom heat loss 54,000 Btu/h 50.0 hp Electrical workout
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

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