SAP 2005 Online Calculation of Annual Solar Contribution

The Valentin Energy Software Online Calculation based on the United Kingdom Government's Standard Assessment Procedure (SAP) for Energy Rating of Dwellings (2005 Edition)

The following calculation provides a theoretical annual thermal energy yield figure generated from a typical solar domestic hot water system (SDHW) fitted in the UK. This figure is used as part of a longer assessment within the ‘Standard Assessment Procedure’ (SAP) which is intended to provide the UK government with an average estimate of energy of a whole house which is independent of geographical location as well as individual hot water patterns. SAP also provides a general basis to report carbon dioxide collector

mitigation.

The resulting figure on this site is intended as a comparative guide and should be checked against the published manual method before overshading using this to complete a full SAP calculation. The calculated figure shown here should not be used alone as indicative solar performance as other factors will be required in SAP for the complete analysis of the DHW system. For example pump electrical losses and back-up appliance efficiency are not considered here.

The calculated SAP figure for solar DHW will have reduced accuracy in the following cases:

Untypical occupancy or hot water usage
Coastal, mountainous or extreme UK latitudes
Non-domestic properties
Unusual systems
Systems not meeting UK Building Regulations guidance
Multiple collector, storage or heat dispersal locations
Extreme storage or collector values
Time periods less than a whole year

For a more complete analysis of a solar heating system, the T*SOL range of solar simulation software is available now in the following free demo versions:

The numeric references shown below (Hx) are equivalent to those found in Appendix H of SAP. The calculated result (Line H17) is automatically calculated when the boxes are completed. If you require further clarification of the terminology and units used for the SAP calculation, you are recommended to read Appendix H of the SAP document which can be viewed here.

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