Chapter 5, Problem 5.94EP

The efficiency of the heat engine is 36 %. The COP of heat pump is.

.The thermal efficiency of a heat engine is 30%, the heat rejected from the engine is 30kJ, evaluate the heat input to the engine.

A tank of water has a shaft rotating at 60 rpm with a torque of 40 N-m that is stirring the water. A heater is also present that operates at 120V and draws 4A of current. Heat is then removed from the water such the total energy content of the water is constant. How much heat is removed?

A refrigeration system is used to cool water in the evaporator at 5 kg/s of water from 30 °C to ice. Find the tons of refrigeration required.

Kentaja is volunteering with Doctors Without Borders, and is distributing the Maderna vaccine in Libya. She is in a region wheré the average Summer temperature is 104°F, but the Moderna vaccine must bé kept in a 50°F refrigerator for distribution. Kentaja remenmbers her Physics training and designs a refrigerator that uUseš retrigerant 12 and has a mass flow rate 0.004 kg/s that 'does the job. For Kentaja's refrigerator calculate : A.) Power input required by the compressor B.) Coefficient of performance

A belt-driven compressor is used in refrigeration system that will cool 10 liters per second of water from 130C to 10C. The belt efficiency is 98%, motor efficiency is 85% and the input of the compressor is 0.7kW per ton of refrigeration. Find the actual COP if the overall efficiency is 65%.

The evaporator of a refrigeration system is to be maintained at-12°C.If degree superheat is 7℃, find the temperature of refrigerant entering the compressor.

The first of the two heat pumps operating on the reverse Carnot cycle 0between 0C and 22oC, and the second between -18oC and 22oCis working. Find the percentage increase between the compressor powers since both are heating at the same value.

Thermodynamics