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- A split air conditioner is used to heat an office in winter and cool it in summer.For this purpose, a split air conditioner with a cooling power of 1200 Btuh (3.5 kw) is used for the office. The power drawn by the split air conditioner is 1.2 kw accordingly. a) COP value b) If the outdoor temperature of the air conditioner is kept 22 C in summer, calculate the limit values for heating and cooling COP if the outdoor temperature in summer is 42C and the outside temperature in winter is -6CA heat engine with efficiency = 60 %, driving both a heat pump and refrigerator at the same time, the work generated by the heat engine (WH.E=W₁ + W₂). W₁ gose to heat pump which (COPH.P.= 2), and W₂ gose to Ref. From the Figure and missing 850 K Tmax=? Tmax =? values, Find: Pada =? Rada= 60 KJ a) The Qadd, Qrej, and Tmin of the Heat Pump, b) The Qadd, Qrej, and Tmax of the Heat Engine c) The Qrej, COPRef., and Tmax of the Refrigerator Qroj=? H.P. Tmin=? Qadd = ? W₁=150 KJ/ H.E. Qrej=? 75 K W₂=50 K/ Ref. Qrej=? 50 KA refrigeration unit with COP = 3.8 is being used to remove heat from a particular machine by 0.42 kg/s of water (C, = 4.18 kJ/kg.K) at 20 °C that is chilled from 40 °C as shown in the Figure. What is the power input (in kW) to the refrigeration unit? Select one: O 11.15 1 2 10.97 9.24 REF TH O 13.26 QH O 14.63 O 12.32
- In an R-22 based refrigeration system, a liquid-to-suction heat exchanger (LSHX) with an effectiveness of 0.65 is used. The evaporating and condensing temperatures are 7.2°C and 54.4°C respectively. Assuming the compression process to be isentropic, find:a) Specific refrigeration effectb) Volumetric refrigeration effectc) Specific work of compressiond) COP of the systeme) Temperature of vapor at the exit of the compressorComment on the use of LSHX by comparing the performance of the system with a SSS cycle operating between the same evaporator and condensing temperatures.A refrigeration cycle operating Qout = 1000 Btu and Wcycle = 300 Btu. Determine the coefficient of performance for the cycle (NOT in %).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? .
- For a power system operates with Wcycle = 810 BTU and Qout = 1769 BTU. What is the thermal efficiency?With a 1 kW pump, the energy leakage per unit time is 0.6 kW for a 1 ℃ temperature difference between a house to be heated and the outside environment. Coefficient of performance of the heat pump used to keep this house at a constant temperature of 20 ℃; If it is up to the theoretical heat pump performance coefficient; What is the minimum outdoor temperature ℃ for this heat pump to meet its needs and be used?A heat engine with efficiency - 60%, driving both a heat pump and refrigerator at the same time, the work generated by the heat engine (WHE=W₁+W₂) W₁ gose to heat pump which (COPH.P.= 2), and W₂ gose to Ref. From the Figure and missing 850 K Tmax =? Tmax=? values, Find: Qodd? a) The Qadd. Qrej, and Tmin of the Heat Pump. b) The Qadd. Qrej, and Tmax of the Heat Engine c) The Qrej. COPRef., and Tmax of the Refrigerator H.P. Tmin=? Qass=? W-150 K H.E. Qraj? 75 K W₂-50 K/ Redd 60 KJ Ref. 50 K
- A refrigerator like the one shown in the figure uses refrigerant 134a as the working fluid and operates in a vapor compression refrigeration cycle with an evaporator temperature of -4ºF and a condenser pressure of 130 Psia, the adiabatic efficiency of the compressor being 90%. The mass flow of the refrigerant is 6.5 lb / min. Calculate: a) the real power supplied to the compressor, in hp b) Refrigeration capacity in Ton, c) the COP1.)A heat engine is operating on a Carnot cycle and has a thermal efficiency of 58.65 percent. The waste heat from this engine is rejected to a nearby lake at 63.41 F at a rate of 823.19 Btu/min. Determine the temperature (R) of the source. 2.)A heat pump operates on a Carnot heat pump cycle with a COP of 8.87. It keeps a space at 27.97 C by consuming 2.52 kW of power. Determine the heating load (kW) provided by the heat pump.1. A geothermal heat pump with a COP of 1.3 provides 48000 BTU/hr of heat to a building. Assuming an electrical power rate of $0.20/kWh. answer the following questions for this system: a. What would be the monthly cost to provide heat at a rate of 48000 BTU/hr if the heat was delivered by a simple electrical resistance heater? b. How much heat is drawn from the ground by the heat pump in that month, in kWh? c. What is the savings per month enjoyed by operating this heat pump for a month vs. a simple electrical resistance heater?