Recovering Heat Lost By Your Air Compressor

Air compressors can provide a great source of heat when converted from electrical energy

. With the increase in electric costs, recovering heat from air compressors is more important than ever in having an efficient air system.

The transference and transportation of heat from a medium to a compartment where it can be utilized is the guiding principle of heat recovery.

Heat can be recovered from electrical energy from three parts of a screw compressor: the fluid cooler, the aftercooler and the drive motor. The heat recovered from both the fluid cooler and aftercooler is dissipated heat, whereas the heat recovered from the drive motor is radiated heat. Together, the heat recoverable from these three parts (theoretically) totals ninety-four percent of the electrical energy consumption.

The greatest percentage of heat that can be recovered in the fluid cooler is seventy-two percent of the electrical energy consumption. The total heat recoverable from the drive motor and compressed air aftercooler is nine and thirteen percent respectively. The six percent of heat lost comes from the heat radiated from the compressor (two percent) and heat remaining in the in the compressed air (four percent). Being able to recover the ninety-four percent of heat largely depends on the options available in your industrial air compressor.

Redirection of heat can be achieved by using conventional HVAC ductwork and controls. This allows warm air from compressors to either provide or remove heat in the compressor room or adjacent areas. Practical applications of the redirection of heat can be used as auxiliary or primary heating for warehouses and workshops, drying air for paint spraying or washing, air curtains, and improving oil burner efficiency.

Space heating, PTG water heating systems and SWT water heating systems can all be used to redirect heat. If your space heating has a ducting system, it can redirect the heat made by the air compressor. The air compressor makes heat which then flows through the vents and is redirected throughout the facility.

A PTG water heating system is composed of a compressor, plate-type heat exchanger and hot water storage tank. The plate surface allows for heat exchange, created through turbulence, and is ideal for hot water supply plants where mixing water and cooling fluids should be avoided. It automatically directs the flow of water through the standard fluid cooler if minimal hot water is needed.

A SWT water heating system is made of tubes with a heat transfer medium fitted between adjacent tubes.

An expansion tank maintains the pressure of the heat transfer medium; the pressure system is controlled by a pressure switch, which can shut down the compressor in the event of breakage or corrosion. This system ensures constant compressor cooling whether or not hot water is needed.

by: Bill Fitzell

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