A theoretical analysis of differently designed solar combi systems is performed with weather data from the Danish Design Reference Year (55 deg N). Three solar combi system designs found on the market are investigated. The investigation focuses on the influence of stratification on the thermal performance under different operation conditions with different domestic hot water and space heating demands. The solar combi systems are initially equipped with heat exchanger spirals and direct inlets to the tank. A step-by-step investigation is performed demonstrating the influence on the thermal performance of using inlet stratification pipes at the different inlets. Also, how the design of the space heating system, the control system of the solar collectors, and the system size influence the thermal performance of solar combi systems are investigated. The work is carried out within the Solar Heating and Cooling Programme of the International Energy Agency (IEA SHC), Task 32.

Issue Section:
Research Papers
Keywords:
solar combi system design, solar combi system size, space heating system, inlet stratifier, net utilized solar energy, solar fraction, heat exchangers, pipes, solar absorber-convertors, solar heating, space heating, thermal analysis
Topics:
Heating, Solar collectors, Solar energy, Hot water
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Copyright © 2007
 by American Society of Mechanical Engineers
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