Hot 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. (more…)
How Cooling Towers Work - Cooling towers use evaporation cooling to cool condenser water from a chiller. Water is pumped to the top of the cooling tower where the water flows down some flow plates to the cooling tower basin. As the water is flowing down the flow plates air is pulled through the plates and over the water where it releases heat through evaporation. (more…)
Heat Exchanger & Domestic Hot Water Storage Tank - In the front is a commercial heat exchanger. Behind the commercial heat exchanger is a domestic hot water storage tank.
The supply water from the city is directed through the heat exchanger where it is heated to a set point temperature. This is usually 120 to 130 degrees Fahrenheit. 180-degree water from the boilers run through tubes inside the heat exchanger while the cold water runs through the inside of the heat exchanger in separate channels outside the tubes where the hot boiler water is. The water is heated and then delivered to the community where it used for showers and washing dishes and other hot water uses. (more…)