Chapter 5, Problem 5.19P

Suppose 400 kW of power potential is wasted during the process as a result of irreversibility. Let say the heat pump received heat at a rate of 1000 kJ/s from a heat source. The reversible power of the present process is found to be 800 kW. Find unavailable heat, which is rejected to the sink.

2.A steam throttling valve with inlet conditions of 2MPA and 400C is connected to the inlet of the turbine. The turbine has 200kW power output and heat abstracted of 100kW. If the mass flow rate is 1kg/s and the exit temperature of steam is 300C, find the exit turbine pressure.

A water pump is used in a heating system to deliver hot water at 91 GPM and 121 ft w.c. The pump efficiency is 90%. What is the water horsepower?

Cogeneration is often used where a steam supply is needed for industrial process energy. Assume a supply of 5 kg/s steam at 0.5 MPa is needed. Rather than generating this from a pump and boiler, the setup in below. is used so the supply is extracted from the high-pressure turbine. Find the power the turbine now cogenerates in this process. 2 3 HP LP

Concentrating solar power plants are frequently located in desert areas where they can collect a lot of solar energy. If the power plant produces steam at a temperature of 1,016 oF and is cooled with ambient air at a temperature of 106 oF what is the maximum efficiency of the conversion of solar energy to electricity? Give your answer in percent (%).

Q.7 The COP of the heat pump is found to be 5.62, and the heat pump operates with the source at 25°C, while the heat absorbed is 2.12 kW. What is the amount of heat rejected ?

A heat engine of 30% efficiency drives a heat pump of COP 5. The heat is transferred both from engine and the heat pump to circulating water for heating the building in winter. Find the ratio of heat transfer to the circulating water from heat pump to the heat transfer to the circulating water from the heat

An air conditioner using refrigerant 134a as work fluid It is used to keep the temperature of a room at 23 ° C by giving heat to the environment. The house from the walls and heat gain from windows is 250 kJ / min ; 900 W of heat from computer, TV and lamps to the room spreads. The refrigerant is 100 L / min in the form of saturated vapor at 400 kPa pressure to the compressor entering with flow and it left from the compressor 1200 kPa pressure and 70 ° C. a) real COP value b) max COP value c) Calculate the min volumetric flow rate for the refrigerant can have for the same compressor inlet and outlet conditions

A heat pump operates between temperature ranges of 100 C and 250 C. Find its COP. What will be its efficiency if the heat engine operates in the same temperature range?