The thermal efficiency of a reversible power cycle operating between hot and cold reservoirs is 60%. Evaluate the coefficient of performance of: (a) a reversible refrigeration cycle operating between the same two reservoirs. (b) a reversible heat pump cycle operating between the same two reservoirs.
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- The heat pump cycle shown in the figure below operates at steady state and provides energy by heat transfer at a rate of 15 kW to maintain a dwelling at 22°C when the outside temperature is Toutside 5°C. The manufacturer claims that the power input required for this operating condition is W cycle = 4 kW. 0 = i Is this cycle possible? Yes No QH = 15 kW bok and Modia Tinside = 22°C kW/K = Heat pump cycle Applying energy and entropy rate balances determine the rate of entropy production, in kW/K. Toutside W cycle3. 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 coefficient of performance. (C) If QC = 500 Btu, QH = 800 Btu, and TC = 20 deg F, determine TH, in deg F. (d) If TC = 30 deg Fand TH = 100 deg F, determine the coefficient of performance. (e) If the coefficient of performance is 8.9 and TC = -5 deg C, find TH, in deg C.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
- Referring to the reversible heat pump cycle shown in the figure, p₁ = 14.7 lby/in². Pa = 34.7 lb/in², v₁ = 12.6 ft3/lb, v4 = 7.0 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 Save for Later P4 °R PI V4 VI Ty Attempts: 0 of 4 used Submit Answer Activa Go to SeA 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.The thermal efficiency of a reversible power cycle operating between hot and cold reservoirs is 50%. Evaluate the coefficient of performance of: (a) a reversible refrigeration cycle operating between the same two reservoirs. (b) a reversible heat pump cycle operating between the same two reservoirs. Part A Evaluate the coefficient of performance of a reversible refrigeration cycle operating between the same two reservoirs. B = i
- Q.1 A refrigerator is being driven by a heat engine and coefficient of performance of refrigerator is 4.The heat taken by the refrigerator is 3500 kJ and the combined engine and refrigerator work output is 300 kJ.The work output (in KJ) of the heat engine isA steam power plant operates in cycle as shown.The rating of the power cycle is 100,000 kW. Determine the m, Qh, Qc and n of the plant.Qin DD0000 Wnet Qout Qout The diagram above represents the thermodynamic cycle of a power plant that has a power output of 500 Megawatts (MW). The cycle parameters are: • Maximum cycle temperature (high temp reservoir): T = 610 °C • Temperature of reservoir (river) to which heat is rejected: T, = 20 °C • Power Output: Wnet = 500 MW Problem: Consider a “new technology" plant that operates on the Carnot cycle. Find the following quantities: MW a. The rate at which heat must be put into the cycle: Qin MW b. The rate at which waste heat is rejected to the river: Q.out
- A vapor-compression refrigeration system operates on the cycle shown below. The refrigerant is tetrafluoroethane. For the following set of operating conditions, determine the circulation rate of the refrigerant, the heat-transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle, and the coefficient of performance of a Carnot refrigeration cycle operating between the same temperature levels. Use the table containing the properties of saturated 1,1,1,2-tetrafluoroethane (R134A) and the PH diagram for tetrafluoroethane (HFC-134a). (Include a minus sign if required.) T S Vapor-compression refrigeration cycle. Evaporation T= -12°C Condensation T = 26°C n(compressor) = 0.77 Refrigeration rate = 400 kJ-s¯1 4 Throttle valve Condenser 3 Compressor Evaporator 2A Carnot vapor refrigeration cycle operates between thermal reservoirs at 40 ⁰F and 100 ⁰F. Determine the coefficient of performance.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 %.