A heat pump operating at steady state maintains a dwelling at 23°C on a day when the outside temperature is -2°C. Energy is loss by heat transfer from the dwelling at a rate of 22000 J/s while the heat pump's power input is 5kW. ● a) Determine the coefficient of performance of the heat pump.

An inventor claims to have developed a refrigerator that at steady state requires a net power input of 1.1 horsepower to remove 12,000 Btu/h of energy by heat transfer from the freezer compartment at -30°F and discharge energy by heat transfer to a kitchen at 70°F. Evaluate this claim.   This claim is a) impossible b) possible

A domestic refrigerator with a COP of 1.2 removes heat from the refrigerated space at a rate of 60 kJ/min. Determine a) the electrical power consumed by the refrigerator and b) the rate of heat transfer to the kitchen air.

3.5 A heat pump is a closed system that operates steadily (or in cycles) while requiring the mechanical power input W, absorbing the heat transfer rate 2o from the ambient, and transferring heat at the rate Qu to the inside of a house. In the steady state, the house temperature remains constant as the heating effect QH is balanced by the heat that leaks to the ambient through the house insulation. The heat pump operates irreversibly. Show that the power requirement of the heat pump is proportional to the rate of entropy generation in the entire region where the temperature is higher than the ambient temperature To. Which features and components are responsible for this entropy generation rate?

In your own words, define efficiency as it applies to a device designed to perform an energy transformation.

SU-1 A heat engine with &=0.400 operates between two heat reservoirs at 250K and 450K. The energy amounts and heat flow diagram for one cycle of operation of the engine is shown to the right. a) What is the change in entropy for the engine for one cycle of operation of the engine? b) Find the change in entropy for the engine surroundings for one cycle of operation of the engine. c) Find the change in entropy for the universe for one cycle of operation of the engine. d) Is this engine real, reversible, or impossible? Explain why using your results from the previous parts. Th-450K 500 200J Engne 300J T-250K

Please answer all questions or leave for someone else to answer. A feedwater heater, operating in steady state, has 2 inlets and one outlet, at inlet 1 steam enters at a pressure of 5Mpa, a temperature of 275°C with a mass flow rate of 40kg/s. At input 2 it is liquid water at a pressure of 5Mpa at 40°C and through a surface of 25cm ^2, at output 3 there is a volumetric flow of 0.06m^3/sec. Determine: a) mass flow of input 2 and 3 b) speed at input 1 c) enthalpy at output 3 d) outlet temperature in 3 e) the quality value if any

Half of the power produced by a Carnot engine is used to operate a Carnot heat pump, which must maintain the interior of a house at 22 ° C, when the ambient temperature is 2 ° C and it is estimated that the house it has heat losses of 62,000 kJ / h. The motor is known to operate between the temperature limits of 800 ° C and 20 ° C. Determine: a) The power required to operate the heat pump b) The heat flux supplied to the motor c) The coefficient of operation of the heat pump d) The efficiency of the motor

Two heat engines operating according to the Carnot cycle are arranged in series. The first machine A receives heat at 500 ° C and expels heat to a tank at temperature T. The second machine B receives the heat that the first expels and in turn expels heat to a tank at a temperature of 30 ° C. a) Calculate the temperature T for the case in which the jobs in the two machines are equal. b) Calculate the temperature T for the case in which the efficiencies in the two machines are equal.

Thermal efficiency of a power cycle is 0.8. For the cycle, Wnet = 250 kJ. Determine Qout in kJ. Enter the answer without units and without rounding.