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Thermodynamics Water is being cooledd in a closed container while being stirred by a paddle wheel. During thisprocess, 25 kJ of heat is taken away from the water, and 15 kJ of heat is added to the water. Thepaddle-wheel work amounts to 5 N.m. Determine the final energy of the system if its initialenergy is 10 kJ. (Sketch the system boundaries)

Between 300K and 600K is the operating temperature of a pair of heat pumps connected in series. The efficiency of the second heat pump is three times that of the first. Find the input work for the first and second heat pumps if the second heat pump absorbs 20kW of heat and the heat release in the first heat pump is the same.      Solve the following problems and sketch the schematic diagram describing the system. Show pertinent and complete solutions.

The thermal effiency of a general heat engine is 35 percent, and it produces 60 hp. At what rate is heat transferred to this engine, in kJ/s?

5. A refrigerator is to remove heat from the cooled space at a rate of 300 kJ/min to maintain its temperature at 28°C. If the air surrounding the refrigerator is at 25°C, determine the minimum power input required for this refrigerator. in min 300 Odo Refrigerator kJ/min -8°C 25°C

A refrigerated compartment is maintained at a temperature of -5°C. Heat from the surroundings, at 25°C, leaks into the compartment at a rate of 1.2 kW. Find the compressor power required to maintain the temperature difference for the following scenarios:

3.5 A novel heat engine is being considered for producing work from the thermal energy contained in the wastewater discharge from a large food-processing plant. On an average day, 35 ° C wastewater leaves the plant and is discharged into the ocean at 1,000 gallons per minute. If the average annual ocean temperature is 10 ° C at that location, what is the maximum power that could be produced by this heat engine? What would be the thermal cycle efficiency of your maximum power engine? You can assume that the heat capacity of water at constant pressure is constant at 4,200 J/kg K.

The temperature inside a kitchen freezer is a constant 256 K, while the temperature of the air in the kitchen is a constant 302 K. The freezer's insulation is imperfect, and it conducts energy into its interior at a rate of 0.150 W. Assuming the freezer can be approximated as ideal (operating in a Carnot cycle), what is the average power required by the freezer's motor to maintain the constant interior temperature? W Need Help? Read It DETA LC

A heat pump is used for warming a house during winter and cooling it over summer. The temperature inside the house is set to 19o C during winter and 24o C during summer. The heat is transferred through the house walls and is estimated to be 2200 kJ/hro C. During winter, the outside temperature is 2o C. What is the maximal power required to operate the pump engine? Using the maximal power obtained for (a) to cool down the house during summer. If the house temperature should be maintained on 24o C, what will be the maximum temperature outside?