Chapter 8, Problem 8.117EP

Heat is transferred to a heat engine from a fumace at a rate of 120KW. If the rate of waste heat rejection to a nearby river is 50000W. Find the net Power output and the thermal efficiency for this heat engine.

The refrigeration system of a food production firm is run using the Reversed Carnot Cycle. The temperature of the hot refrigerant supply in the system should be 52°C, while the temperature of the sink should be -14°C. Its capacity is projected to be at least 24 tons. It's important not to disregard losses. Find and Show unit analysis and conversion: a. COP and COP of Heat Pump b. Heat rejected from the system in kW c. Network in, Hp and Energy Efficiency Ratio

In a certain steam plant the turbine develops 703.72 kJ/kg. The heat supplied to the steam in the boiler is 2800 kJ/kg, the heat rejected by the steam to the cooling water in he condenser is 2100 kJ/kg and the network of the cycle is -995 kW. Calculate the pump work in kJ/kg and steam flow rate.

Water at 55°C is cooled in a The temperature of the surrounding air is from the condenser is 2,300,000 kJ/h. Find the capacity in liters per second of the pump used in the cooling tower. cooling tower which has 32°C dry bulb and 70% RH. an efficiency of 65%. The heat dissipate

For a 4 stage compression refrigeration system with evaporator pressure of 1atm and condenser pressure of 16atm. find the pressure ratio, hence find the intermediate pressures

An 80 ton refrigeration system requires 105 KW from VECO. If motor compressor efficiency is 60%, find the COP.

complt solution

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Note: Use the relevant chart for each problem.in addition to having the solution on a piece of paper Q2/ A refrigeration system operates according to reversed Carnot cycle, low temperature is -40 °C and the work done is 1.2 kW/TR. Find; the coefficient of performance as refrigerator and heat pump, absorbed heat and rejected heat.