The general purpose of heat recovery can be said to be threefold: to reduce energy use; to reduce peak power need; to increase the time constant of the building for heating and ventilation as well as domestic hot water production. In this documant the interest is concentrated on heat recovery in ventilation systems and theirinfluence on power and energy balance for buildings.
The HVAC system for the new Standard Federal Bank headquarters in Troy, Michigan, the United States, was designed for energy efficiency, low operating costs and a high quality indoor environment. Ice thermal storage and heat reclaim from the building's data centre, in combination with a well insulated building envelope, have resulted in calculated savings of USD 62,000 per year with a payback period of 3.3 years. The design of this building's HVAC system, completed in 1989, exceeds all codesand standards for energy efficiency in the United States.
Balanced ·mechanical ventilation with heat recovery (MYHR) offers, in principle, a way of reducing carbon dioxide emissions from dwellings. In order for such systems to produce a clear reduction in C02 it is necessary for the emissions from the low temperature heat saved to exceed those from the electricity used to drive them. This condition places a lower limit on the coefficient of performance (COP) of MYHR systems, which in the UK is around 3. The major variable in system performance is the electrical input to the fans.
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