A refrigerator is required to remove heat from the cooled space at a rate of 150...
A refrigerator is required to remove heat from the cooled space at a rate of 150 kJ/min to maintain its temperature at -5 degrees celsius. The ambient air surrounding the refrigerator is at 25 degrees celsius.
(a) What is the maximum coefficient of performance for this refrigerator?
(b) What is the minimum power input required to run this refrigerator?
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A refrigerator is required to remove heat from the cooled space
at a rate of 150...
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finite element method
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A heat pump is to be used to heat a house in winter and then reversed...
A heat pump is to be used to heat a house in winter and then
reversed to cool the house in summer. The interior space is to be
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estimated to be χ = 0.525 kJ/sec per degree difference in
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Page 2 of4 Problem A Carnot heat engine received heat from a reservoir at 900 °C...
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QS. An air-conditioner with a power input of 1.5 kW is working as a refrigerator (B-3) or as a heat pump (B' 4). It maintains an office at 20C year round which exchanges 0.5 kW per degree temperature difference with the atmosphere. There is a range of the outside temperatures for which this unit is sufficient a) Write the expressions that define the coefficient of performance (COP) for a refrigerator (B) and a heat pump (B) b) Calculate the maximum...
Question 1 (10 marks) As shown in Fig. Q1, a house is cooled by an air conditioning system to maintain the temperature inside the house to be 25 °C during the summer. When the ambient temperature outside is 45 °C, the rate at which heat is transferred to the house is estimated to be Qleak .u HP 30 kW 1.1 Calculate the coefficient of performance (COP) of this air conditioning system if it operates on a Carnot cycle? Fig. Q1...
finite element method
2. Aluminum fins with rectangular profiles (5 mm wide and 1 mm thick) are used to remove heat from a surface whose temperature is 150°C. The temperature of ambient air is 20°C. The thermal conductivity of aluminium is 168 W/m.K. The natural convective coefficient associated with the surrounding air is 35 W/m2.K. The fins are 150 mm long and the heat loss from the tip of the fin may be neglected. (a) Determine the temperature distribution along...
A heat pump is to be used to heat a house in winter and then
reversed to cool the house in summer. The interior space is to be
maintained at 20oC. Heat transfer through walls and roof is
estimated to be χ = 0.525 kJ/sec per degree difference in
temperature between inside and outside. (6a) (8p) In winter if the
outside temperature is 5oC, what is the minimum power required to
drive the heat pump? (6b) (12p) For the same...
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