This presentation was given during a lecture at the Tshwane University of Technology in South Africa and provides information on the measurement and verification standard guidelines and procedures applied to calculate the energy savings resulting from domestic solar water heating systems (SHWS). This guidelines have been developed to assess the performances of high pressure and low pressure solar water heating systems. The measurement of the high pressure solar water heating system is based on a series of parameters, such as the geographic location, ambient temperature changes and water usage patterns. 2 other important criteria’s are the location of the installation and the number of people living in a household.
For the low pressure system, the main focus is to identify the electricity consumption and the time of use to heat water after retrofit. To do so, the researchers have interviewed inhabitants and measured the electricity prior and after retrofit.
The analysis of all data showed that after the installation of SWHS, the hot water consumption increased substantially and amounted to almost the whole volume of the hot water tank.
It has however been noticed that in some cases the savings were low and further developments were needed.
Author: O.D. Dintchev
Date of publication: 10 April 2013