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Article: Development of a model predictive controller for tankless water heaters.(Report)
- Article from:
- HVAC & R Research
- Article date:
- January 1, 2009
- Author:
CopyrightCOPYRIGHT 2009 American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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INTRODUCTION
Tankless water heaters (TWHs), also called instantaneous or demand water heaters, have both advantages and disadvantages when compared to storage water heaters. Some of the advantages are that they are smaller, they have a longer life, they can provide a continuous stream of heated water, and they typically use less energy than their storage counterparts. Two main disadvantages are that they require a large power input and that the outlet temperature is difficult to control.
There are several mechanisms that lead to reduced energy consumption when using TWHs instead of storage water heaters. Storage water heaters use a tank to store hot ...