Information Sheet. Thermal Performance of a Factory Made Thermal Solar Domestic Hot Water System

Transcription

1 FORSCHUNGS- UND TESTZENTRUM FÜR SOLARANLAGEN Institut für Thermodynamik und Wärmetechnik Universität Stuttgart in Kooperation mit Professor Dr. Dr.-Ing. habil. H. Müller-Steinhagen Information Sheet Thermal Performance of a Factory Made Thermal Solar Domestic Hot Water System based on test report 09SYS81, ITW, University of Stuttgart, January 8 th 2010 Stuttgart, January 11 th 2010 Client Manufacturer Brand name Energie, est Zona Industrial de Laúndos, Lote Laúndos Póvoa de Varzim, Portugal Energie, est Eco 300IS Year of production 2009

2 Information Sheet based on test report No. 09SYS81 page 2 of 8 1 General specifications (acc. to manufacturer) Manufacturer Energie est Zona industrial de Laúndos, Lote 48, Laúndos Póvoa de Varzim, Portugal Contact person Type Serial product or prototype Tiago Costa Tel.: Fax: tiagocosta@energie.pt Eco 300IS Serial no year of production 2009 serial product Description of the system 1) Absorber 2) Hot water store 3) Soloar loop heat exchanger 4) Auxiliary emergency heater 5) Compressor 6) Accumulator for refrigerant 7) Thermostatic expansion valve 8) Magnesium anode The system under investigation is a solar domestic hot water system in which the solar loop operates on the principle of a heat pump. It is composed of two unglazed absorber with 3.20 m² total aperture area, an insulated, stainless steel hot water store (300 l), a so-called thermoblock, which comprises the electrical powered compressor, the thermostatic expansion valve, the electrical heating element and the controller. The heat transfer fluid in the solar loop is the refrigerant R134a. The refrigerant is passing the absorber and evaporates while collecting energy from the surroundings. The evaporated refrigerant is sucked by the compressor which raises the pressure. In the condenser, which is integrated as an immersed solar-loop heat exchanger in the lower part of the store, the refrigerant condenses while transferring its condensing heat to the domestic water in the store. Before the refrigerant is returning to the absorber, a thermostatic expansion valve is reducing the pressure. As emergency heater an electrical heating element is located in the lower part of the store at the height of the solar-loop heat exchanger.

3 Information Sheet based on test report No. 09SYS81 page 3 of 8 Total store volume No. of collectors or absorbers respectively 300 l 2 Total collector area (aperture) 3.20 m² 2 Thermal performance characterisation Based on the results of the thermal performance characterization indicated in the test report 09SYS81, ITW, University of Stuttgart, January 8 th 2010 the following performance indicators can be determined using the equation specified below: Solar fraction Coefficient of Performance () Seasonal Performance Factor () Energy amount from renewable energy (solar irradiation, ambient heat) to cover the hot water demand () f sol L L d L par par s, a L par

4 Information Sheet based on test report No. 09SYS81 page 4 of 8 Draw-off: 100 %, 6 hours after solar noon on annual base for a demand volume of 200 l/d on annual base for a demand volume of 250 l/d

5 Information Sheet based on test report No. 09SYS81 page 5 of 8 on annual base for a demand volume of 300 l/d on annual base for a demand volume of 400 l/d

6 Information Sheet based on test report No. 09SYS81 page 6 of 8 Draw-off: at 7 00 : 40 %; at : 20 %; at : 40% on annual base for a demand volume of 200 l/d on annual base for a demand volume of 250 l/d

7 Information Sheet based on test report No. 09SYS81 page 7 of 8 on annual base for a demand volume of 300 l/d on annual base for a demand volume of 400 l/d ** ** **

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