Community Research and Development Information Service - CORDIS


The report explains what requirements must be fulfilled in determining the size of a solar energy system to produce hot water for domestic use. Solar systems of this kind are usually installed alongside conventional systems in order to ensure a continuous supply of hot water even in the absence of sunshine. It is also necessary to calculate: (i) the amount of solar energy which one solar collector can supply in a year (which can be expressed as the fraction "f" of the total energy requirement to be satisfied by the solar system); (ii) the increased capital cost compared to the conventional system; (iii) the total operating costs for the life of the solar system, compared to the operating costs of a conventional system. The report illustrates the calculation of the solar fraction "f" and the DHW4 calculation programme, describes how to carry out the economic analysis of a project, and provides an example of the application of the DHW4 programme.

Additional information

Authors: COLOMBO R, JRC Ispra (IT);GILLIAERT D, JRC Ispra (IT)
Bibliographic Reference: EUR 13905 IT (1992) 27 pp., MF, ECU 6
Availability: (2)
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