The ratio of the actual C.O.P to the theoretical C.O.P. is known as relative coefficient of performance. The relative coefficient of performance is equal to (Actual C.O.P.) /(Theoretical C.O.P.)

A ton of refrigeration (TR), also called a refrigeration ton (RT), is a unit of power used to describe the heat-extraction capacity of refrigeration and air conditioning equipment. It is defined as the rate of heat transfer that results in the melting of 1 short ton of pure ice at 0 °C (32 °F) in 24 hours.

3.517 kW

A good COP for heat pump units starts at about 2.0 for an air source heat pump and about 3.1 for geothermal, but heat pump COP can be well above 4.0 too, as seen in the chart below. A geothermal heat pump is also called a ground source heat pump.

To improve the coefficient of performance, its requires that the compressor work should decrease and refrigeration effect should increase. It means that decrease in condenser pressure and temperature so the refrigeration effect will increase and compressor input work due to this cop will increase.

10 Ways to Improve the Energy Efficiency of Your Refrigerator (and Freezer)

1. Replace the Rubber Seal on the Door.
2. Protect Your Fridge From High Heat Sources.
3. Tidy up Your Condenser Coils.
4. Cool Off Your Leftovers.
5. Keep the Doors Closed.
6. Take Advantage of In-Door Water & Ice.
7. Organize & Remove Clutter From Your Refrigerator.

So, to increase COP for a given evaporator temperature you would have to decrease the temperature of the heat sink (condenser). Practically, this means you have to place your refrigerator in a cool place so the heat transfer from the condenser coil to the ambient is maximized.

1. 6 Ways to Optimize Your Refrigeration Efficiency and Lower Energy Costs.
2. Optimize settings.
3. Size compressors to match loads as closely as possible.
4. Install VFDs on screw compressors.
5. Install VFDs on condenser motors.
6. Use floating head pressure to maintain ideal temperatures.
7. Use a completely integrated automation system.

The steam economy of an evaporator can be improved by adding more effects. The first effect has the highest boiling temperature, while the last effect has the lowest. Each successive effect uses the vapor from the previous effect as a heat source.

It’s cool that you want to keep your fridge humming efficiently, but the amount of food you store in it doesn’t matter. “A full refrigerator doesn’t decrease energy use,” says researcher Jacob Talbot of the nonprofit American Council for an Energy-Efficient Economy (ACEEE).