Chapter 5, Problem 5.9P

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A reversible engine converts one-sixth of heat input into work. When temperature of sink is reduced by 70 degree Celsius, its efficiency is doubled. Fin temperature of source and sink.

A heat pump shown is driven by 3.0 MW motor and receives heat from a source at 60C and deliver energy to a boiler that operates at constant pressure and saturation temperature of 140 C. The water enters the boiler as saturated liquid and leaves as saturated vapor at the same temperature. The heat pump operates with a COP (coefficient of performance) that is 60% of a Carnot heat pump COP. Find : 1- the maximum mass flow rate of water the system can deliver 2- the heat received from the source Q, boiler mter TH VHP - w T 60°C

A heat pump shown is driven by 2.5 MW motor and receives heat from a source at 80 C and deliver energy to a boiler that operates at constant pressure and saturation temperature of 130 C. The water enters the boiler as saturated liquid and leaves as saturated vapor at the same temperature. The heat pump operates with a COP (coefficient of performance) that is 70% of a Carnot heat pump COP. Find: 1- the maximum mass flow rate of water the system can deliver 2- the heat received from the cold source Q, boiler mwater eb TH V HP 2.5 MW TL=80°C

Find the COP of refrigerator working between temperatures 350 K and 1050 K. What will be efficiency of heat engine operating in same temperature range?

Find COP of a reversible heat pump operating between temperatures 20 and 200 °c

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A heat engine receives 5 kW at 800 K and 15 kW at 1000 K rejecting energy by heat transfer at 600 K. Assume it is reversible and find the power output, W.?