Explain a method used to determine the correct operating discharge pressure of a commercial refrigeration system
What will be an ideal response?
The method used is as follows:
Step 1 – Measure the dry-bulb temperature of the air entering the condenser. (We will refer to this as the EAT – Entering Air Temperature).
Step 2 – Measure the system's operating suction pressure.
Step 3 – Using a Pressure/Temperature (P/T) chart, convert the suction pressure to its equivalent saturation temperature.
Step 4 – Determine the system's application: low temperature, medium temperature, or high temperature. A low temperature system is one that operates at an evaporating temperature of 0°F and below. A medium temperature system is one that operates at an evaporating temperature of between 0°F and 25°F. A high temperature system is one that operates at an evaporating temperature of between 25°F and 45°F.
Step 5 – Using the chart below, determine the appropriate Temperature Rise (TR). The TR is the difference between the EAT and the condensing temperature of the refrigerant in the condenser.
Step 6 – The Condensing Temperature
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