Tag Archives: cold water supply

Hot Water Boiler Economizer PreHeater | Energy Efficiency

Hot Water Boiler Economizer PreHeaterHot Water Boiler Economizer PreHeater | Energy Efficiency

This is a hot water economizer and is a big preheater for domestic hot water use. This boiler plant serves a large community for heating and domestic hot water use. Domestic hot water is used for showers, washing dishes, laundry, ect, ect, ect…. The cold water supply from the city is routed through the economizer to be pre-heated before it goes through a heat exchanger and then the hot water storage tank. This system saves money because it uses the exhaust gases from the boiler to pre-heat the city water supply which is normally 50 degrees Fahrenheit. The exhaust gases from the boiler would otherwise be vented to the atmosphere and would be considered wasted heat.

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Commercial Boiler Stack with Economizer | HVAC Heating

Commercial Boiler Stack with EconomizerCommercial Boiler Stack with Economizer | HVAC Heating

Commercial Boiler Stack with Economizer – This is not a normal commercial boiler stack in this boiler room. It has a bypass stack for an commercial hot water economizer. All boilers have make-up water to make up for water lost in the systems especially for domestic hot water use. This hot water boiler system also served the domestic water needs for the local community where these boilers provided heat. Notice the dampers on the stacks (both the vertical and the horizontal stacks). These are controlled by a direct digital controller, located in the boiler room, and cause the hot gas to be diverted to an commercial hot water economizer instead of outside. Inside the boiler economizer were coils where the cold water supply water from the city was routed. This cold water supply was for domestic hot water use. Domestic hot water use is hot water for showers or the sinks for washing dishes or your hands. The water supplied from the city was typically fifty degrees Fahrenheit. After running through this cold supply water from the city through the boiler economizer the water was almost ninety degrees Fahrenheit. This system saved the organization money by using the heat from the gas stack gases. Instead of dumping it outside where it would be dissipated into the outside air it was routed through the commercial hot water economizer where it pre-heated the cold water supply for domestic hot water use. The commercial hot water economizer will help pay for itself and many other things by making the boiler room more efficient.

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SUNDAY, OCTOBER 19, 2014