Chapter 8, Problem 8.90P

Find COP of refrigerator and heat pump operating between temperatures 300 K and 900 K

Find out the COP of a Carnot heat pump operating between temperatures 6o C and 37o C.

A cycle HE does 60kJ of work per cycle. If the efficiency of the heat engine is 60%. The heat rejected per cycle is.

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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

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

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Find the power output and the low T heat rejection rate for a Carnot cycle heat engine that receives 6 kW at 250 ℃ and rejects heat at 30 ℃.

A water cooler for drinking water should cool 25 L/h water from 18 C to 10 C while the water reservoirs also gains 60 W from heat transfer. Assume that a small refrigeration unit with a COP of 2.5 does the cooling. Find the power input to the unit.