Heat Recovery Service
From Heating Services
Building systems are tasked with generating heat for a variety of uses: space and ventilation heating, domestic water heating, process heating etc; too often heat is allowed to escape a building becoming waste heat. It is wasted heat if it is exhausted or leaks from a buildings ventilation system, or, is produced internally by a production process than exhausted outside (air) or put down the drain (water). It is considered waste heat because it is exhausted at a temperature warmer than the outside air, instead of being put to use heating the building; or because it is drained at a temperature warmer than the incoming building water supply where it could have been used for water or process heating. Opportunities often exist to recover this wasted heat, allowing a building owner to use less energy heating their building (recovered heat offsets the production of required heat).
How It Works
Heat recovery is based on identifying the sources of and uses for waste heat in order to find practical and cost effective ways of reclaiming the wasted energy for use. The final goal of any heat recovery system is to preheat air or water before it is introduced into a building’s air or water heating, or process systems.
- Ventilation Heat Recovery - In the harsh Canadian prairie climate, the ventilation system in commercial and industrial buildings is where heat recovery is commonly used. A heat recovery ventilation system can be either an open or closed process. In an open process system, a percentage of room temperature exhaust air is physically mixed with the incoming air supply. This system is the most efficient, but allows cross-contamination of the fresh air supply. If cross-contamination is not desired, then a closed system must be used. Here, exhausted air (at room temperature), is forced through a heat exchanger which transfers the heat energy to the incoming air supply of the building without allowing any mixing of the two air sources.
- Water Heat Recovery - The same principles underlie water heat recovery systems, where used hot water is diverted through a heat exchanger to reclaim the wasted heat; offsetting some of the demand on domestic water heating, hydronic heating, or process heating.
- Other Types – More complex types of heat recovery where waste heat is in the form of air and is recovered as a preheat to water or the opposite is also possible in certain circumstances.
Benefits
- Heat recovery systems are typically low maintenance
- Ventilation heat recovery systems reduce the cost of a buildings’ ventilation heating requirements by 50% and up
- Water heat recovery systems reduce the cost of a buildings’ water heating requirements by 60% and up
- Heat recovery systems preheat supply air or water, which can increase the lifecycle of older heating systems by reducing the operating demand on these systems
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