First, you need to determine the incoming water temperature, the water temperature you require and the flow rate. Then, follow these steps:

1. Subtract the water temperature you require from the incoming water temperature (e.g., 72°F - 58°F = 14°F)
2. Calculate BTU/hour by multiplying the total from the last step, the gallons per hour, 60 and 8.33 (e.g., 14°F x 10 x 60 x 8.33 = 69,972 BTU/hour)
3. Calculate the tons of cooling capacity by dividing the BTU/hour by 12,000 (e.g., 69,972 ÷ 12,000 = 5.831 tons)
4. Oversize the chiller by 20% by multiplying the tons by 1.2 (e.g., 5.831 x 1.2 = 6.9972)
5. This is the ideal size for your chiller (e.g., 6.9972 = 7-ton chiller)

Need more help? Contact a United Rentals representative for help with your air chiller rental.

Air chillers are industrial refrigeration systems that use evaporators, chemical refrigerants, compressors, condensers and expansion units to collect heat and reject it through a transfer of energy to water or air. This process also pumps condensed cool air inside to maintain the preset temperature.

Air-cooled chillers are usually placed outside and require free-flowing air. They are easy to install and take up less space than water-cooled chillers. Water-cooled chillers are usually placed inside, and they require a constant water supply and a cooling tower system that sits outside. They are more power efficient and last longer than air-cooled chillers.