A refrigeration condensing unit pumps a fluid that absorbs heat from an area and releases it elsewhere The fluid rises in temperature as it goes through the system and a more powerful unit can produce a greater temperature rise. You also need a more powerful unit to pump the fluid through the system at a higher speed. The temperature rise and the flow rate together determine unit's cooling rate, which corresponds with the unit's total size.
Subtract the fluid's temperature when it leaves the refrigeration area from its temperature on entering it. If, for instance, fluid enters the chamber at 51 degrees Fahrenheit and leaves it at 62 degrees:
62 - 51 = 11 degrees.
Multiply the temperature rise by the fluid's volumetric flow. With a flow, for instance, of 270 gallons per minute:
11 x 250 = 2,750.
Multiply the result by 500, a conversion constant, to determine the total cooling requirements in British Thermal Units:
2,750 x 500 = 2,750 x 500 = 1,375,000.
Divide the result by 12,000 to convert it to refrigeration tons:
1,375,000 / 12,000 = 114.58.
Rounding up, you need a 115-ton condensing unit.
- Photo Credit Jupiterimages/Photos.com/Getty Images
Where Is a Condenser on a Refrigerator?
The condenser fan is a radiator-like device responsible for warming your refrigerator before the heat is transferred to cool areas. To maintain...
How to Install a New HVAC Condenser Unit
HVAC condenser units allow people to be comfortable in their homes. Using refrigerant, they pull the heat and humidity out of the...
How to Read What Ton AC Unit I Have
Within an air conditioner a specific substance known as a refrigerant is changed between gaseous and liquid states by applying pressure changes...
How to Wire an Outside AC Condenser
An air conditioning system uses the outside condensing unit to force liquid refrigerant through a metering valve, found in the inside unit's...
How to Change an AC Condenser
An air-conditioning condenser contains a compressor, fan and coil. The condenser's compressor pumps refrigerant through the condensing unit to the evaporator coil,...
How to Charge Refrigeration Systems
From the largest walk-in freezer to the smallest water cooler, all refrigeration systems work with the same principles. A refrigerant absorbs heat...
How to Replace a Refrigeration Dryer
Air conditioning systems use refrigeration dryers to remove contaminants from the refrigerant. Many air conditioning systems use two refrigerant dryers. The refrigerant...
How to Calculate Evaporator Sizing
Like similar Heating, Ventilation and Air Conditioning (HVAC) appliances, an evaporator pumps a refrigerant to lower the temperature. Larger evaporators cool larger...
How to Size Refrigeration Systems
Refrigeration systems include refrigerators, chillers, air conditioners and evaporators. The devices differ in their specific mechanisms, but all work by pumping a...
How to Find the Tons on an A/C Unit
Central air conditioning systems are rated by tons and British Thermal Units (BTUs). When replacing your old central air system, you will...
How to Determine a Condensing Unit Size
The size of an air conditioner's condensing unit is key to its cooling performance. It's actually better to have an air conditioner...
Why Must an Air Conditioner Condensor Match the Evaporator?
Whole building air conditioners are split systems consisting of outside components — the condenser and compressor — and an inside component, the...
How Do Refrigerators Work?
A refrigerator works by circulating a refrigerant through evaporator coils, so that heat is released and the refrigerant gets very cold. Discover...