Energy savings for solar heating systems - phase 1
This project is first phase of a project aiming to determine energy savings in practice for different solar heating systems. Installers and solar collector manufacturers will be invited to install state of the art solar heating systems in Department of Civil Engineering's test facility for solar heating systems. Both solar domestic hot water systems and solar combi systems are considered. Systems with and without a new natural gas boiler/oil boiler are considered. In the test facility measurements of the thermal performance of the systems are carried out during a long test period. Simulation models calculating the yearly thermal performance of the systems are carried out with the validated models. A number of calculations with different changes of the design of the systems are carried out. In this way the manufacturers can be assisted in their efforts to improve their systems. A number of information meetings for interested home owners will be organized at the Technical University of Denmark. Information on solar heating systems, on energy savings for solar heating systems and on the project will be presented. The tested systems will be shown to interested home owners and the home owners can talk to researchers, solar collector manufacturers and installers
The aim of the project is to test marketed solar heating systems in a laboratory test facility and to establish contact between installers of solar heating systems and house owners wanting to install solar heating systems. Two small SDHW systems from Batec A/S and from Velux Danmark A/S have been tested under realistic conditions side-by-side with a small solar combi system from SONNENKRAFT Scandinavia A/S. The thermal performances of the systems have been measured for a long test period. Measured thermal performances have been compared to thermal performances calculated with detailed simulation models for a short period for the three systems. A good agreement between measured and calculated thermal performances was achieved for all the systems. The yearly thermal performance for the three systems was calculated for different hot water consumptions based on the weather data from the Danish Test ReferenceYear. The thermal performances are compared to the thermal performances of earlier tested marketed solar heating systems. The thermal performances for the three tested systems are lower than the thermal performances of the most efficient of the earlier tested systems. The reason is that the three systems are high flow systems with a hot water tank with a built in heat exchanger spiral, which equalize temperature differences in the hot water tank during operation periods of the solar collector. Low flow systems with a highly thermal stratified hot water tank, such as a mantle tank, have higher thermal performances than high flow solar heating systems based on spiral tanks. Further, two of the tested systems are based on hot water tanks with pipe connections to the upper part of the tank. These pipe connections results in high thermal bridges and thereby in a low thermal performance of the solar heating system. It is recommended to use hot water tanks with no pipe connections and penetrations through the insulation in the upper part of the tank. The tests form a good basis for development of improved marketed systems.
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Participants
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Contact
Brovej bygn. 118
DK-2800 Kgs. Lyngby
www.byg.dtu.dk
Furbo, Simon , 45251857, sf@byg-dtu.dk
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