Combined Space and Water Heating: Next Steps to Improved Performance
- NorthernSTAR Building America Partnership, Minneapolis, MN (United States)
A combined space- and water-heating (combi) system uses a high-efficiency direct-vent burner that eliminates safety issues associated with natural draft appliances. Past research with these systems shows that using condensing water heaters or boilers with hydronic air handling units can provide both space and water heating with efficiencies of 90% or higher. Improved controls have the potential to reduce complexity and improve upon the measured performance. This project demonstrates that controls can significantly benefit these first-generation systems. Laboratory tests and daily load/performance models showed that the set point temperature reset control produced a 2.1%-4.3% (20-40 therms/year) savings for storage and hybrid water heater combi systems operated in moderate-load homes.
- Research Organization:
- NorthernSTAR Building America Partnership, Minneapolis, MN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1263541
- Report Number(s):
- NREL/SR-5500-63459; DOE/GO-102016-4600
- Country of Publication:
- United States
- Language:
- English
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