A refrigerator removes 25 kW of heat from a cold space while rejecting 35 kW of heat to the warm space. Determine the power used and the coefficient of performance of the refrigerator.

Given: Q?C = 25 kW; Q?H = ?35 kW

What will be an ideal response?


For a cycle, Wcycle = Qcycle
There are two heat transfers and one power, so Q?cycle = Q?H + Q?C = W?
Therefore, W? = - 10 kW
The coefficient of performance is then ? = Q?C/|W?|=2.50

Trades & Technology

You might also like to view...

The surveys of the property lines shown in Figure P7–6 were plotted using traversing by angles-to-the-right. Use the appropriate formula to verify that your calculations equal 360° for each survey.

What will be an ideal response?

Trades & Technology

What helps to filter water before it reaches open areas that store surface water?

a. Weeds c. Sand in the soil b. Wetlands d. Strainers

Trades & Technology

A special-purpose digitizing system just acquired by Bzybee Consultants has B = $50,000 and a 4?year recovery period. (a) What is the accumu­lated depreciation after year 3 if the salvage value of the system is $5000? (b) What is the total amount of depreciation remaining?

What will be an ideal response?

Trades & Technology

The refrigerant in a mechanical compression refrigeration system absorbs and releases heat by:

A) Changing its physical state. B) Converting energy to mass. C) Changing its molecular composition. D) Changing its temperature.

Trades & Technology