Question

A simple saturated refrigeration cycle for R-12 system operates at an evaporating temperature of -5°C and a condensing temperature of 40°C. For a refrigerating capacity of 100 KW, determine the following:

a. the useful refrigeration in TR;

Answer 1

To calculate the refrigeration in TR, the refrigerating capacity of 100 kW is divided by 3.517 kW/TR, yielding approximately 28.44 TR for the given R-12 refrigeration system operating between -5°C and 40°C.

Step-by-step explanation:

To convert the refrigerating capacity from kilowatts to tons of refrigeration (TR), we use the relationship that 1 TR is equivalent to 3.517 kW. Therefore, for a refrigerating capacity of 100 kW, the useful refrigeration in TR is:

Useful refrigeration in TR = 100 kW / 3.517 kW/TR = 28.44 TR (approximately)

The simple saturated refrigeration cycle operates with R-12 refrigerant between a low temperature of -5°C (evaporator) and a high temperature of 40°C (condenser). The refrigeration effect, which is the heat absorbed in the evaporator, is what the system can use to cool the environment or substance of interest. The coefficient of performance (COP) of such a cycle can be determined using thermodynamic relations for the refrigerant properties at the given temperatures, but it is not asked for in this question.