This method can be used with most commodities but is slow compared methods discussed below. Used refrigerated truck bodies make excellent small storage rooms. Fans should be equipped with a thermostat that automatically shuts them off as soon as the desired product temperature is reached. Do not operate forced-air fans after the commodity has been cooled to its optimum temperature. Water removes heat about 5 times faster than air, but is less energy efficient.
Mechanical refrigeration is the most efficient method of cooling water.
A thermal storage immersion hydrocooler system can be economically fabricated for various volume needs. Ice in water will also provide a source of coolant. Used, stainless steel bulk farm milk coolers may be excellent options for some growers. If hydrocooling water is recirculated, it should be chlorinated to minimize disease problems. Because of its residual effect ice methods work well with high respiration commodities such as sweet corn and broccoli.