s) Given a fixed sink temperature of 300 K, plot the thermal efficiency of a completelyreversible Carnot heat engine as a function of source temperature from 300 K up to 1000 K.High-temperature reservoir300 K

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Answered: s) Given a fixed sink temperature of…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.46P

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A Carnot heat pump to heat a house in the winter and keep the interior temperature of the house at 25 ° C. is used. The heat losses of the house in a day when the outdoor temperature is 2 ° C are approximately 55000 kJ / hour. determined. If the heat pump is drawing 6.6 kW of power from the grid while it is running a) How many hours the heat pump has been running on the specified day (outdoor temperature is 2oC) b) By accepting that the electricity price is 0.085 dollars / kWh c) Calculate the cost of heating the same day if a direct electric heater was used.
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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 is
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A 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 K
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A heat engine is supplied with 278 kJ/s of heat at a constant fixed temperature of 283 °C and the heat rejection takes places at 5 °C. Then results reported as: a. 208 kJ/s rejected b. 139 kJ/s rejected Classify which of the results report a reversible cycle or irreversible cycle or impossible cycle.
The Carnot efficiency of a heat engine running between two temperature limits 30 °C and 550 °C is. %. 75.0 96.2 37.8 63.2
A heat pump with COP of 2.0 is used to heat water to 90 oC for cleaning purpose. This heat pump absorb heat from surrounding at 30 oC and received the entire power, ̇ from a Carnot heat engine operating between 200 oC and 25 oC. The Carnot heat engine received 6.3 kW of heat from the high temperature source. i) Draw the schematic diagram of the above system. ii) Determine the power received by the heat pump, ̇ from Carnot heat engine, kW. iii) Calculate the rate of heat supplied to the water by the heat pump, kW. iv) Determine the COP of the heat pump if it operates on a reversed Carnot cycle.
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An irreversible heat pump with COP of 2.4 is used to heat water to 80°C for cleaning purposes. This heat pump absorbs heat from surrounding at 30°C and received the entire power, W from a Carnot heat engine operating between 250°C and 30°C. The Canot heat engine received 6.3 kW of heat from the high temperature source. i) Draw the schematic diagram of the above system. ii) Determine the power received by the heat pump, W from Carnot heat engine, kW. i1) Calculate the rate of heat supplied to the water by the heat pump, kW. iv) Determine the COP of the heat pump if it operates on a reversed Carnot cycle.

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