1054Heat Recovery

Heat recovery systems are used during the heating season to extract waste heat and humidity from exhaust air which is used to preheat cold fresh air from outside. In warm weather, they may be used to extract heat and humidity from warm fresh air and dispel it into the exhaust air stream. Their use is particularly appropriate to buildings with high outside air requirements. Heat recovery systems are discussed in more detail in Chapter 8.

One special type of heat recovery, dubbed bootstrap heating, recovers waste heat from warm condenser water to provide nearly free heat to meet perimeter heating needs. This is most applicable to buildings in which interior zone cooling exceeds the requirements for perimeter heating. Care must be taken in utilizing bootstrap heating to avoid reducing the condenser water temperature below the chiller equipment's minimum entering water temperature.

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