Six errors have been identified in SAP (UK’s Methodology for Calculating Residential Energy Consumption) and they are all to do with the way that it calculates the energy saved from Waste Water Heat Recovery (WWHR) systems.
With some at over 60 per cent efficient, these systems are more cost effective to install than almost any other energy saving product.
These issues will be explored further at a Press Conference on Thursday 3rd December. Speakers will include Danny Kinahan, MP.
The fix is simple and would take less than two days to implement. Recommendations have been taken to Lord Bourne, the Under Secretary State for Climate Change, but he will not sign it off, claiming it to be Cabinet matter.
WWHR systems transfer the heat, usually thrown down the drain during showering, back into the house by warming the incoming cold water feed. These systems are already used in the UK, but not in the volumes found in other countries.
That something was suspicious about the UK’s SAP calculations first came to light when WWHR was first used in the government funded AIMC4 project. WWHR was installed in a number of homes and their measured performance was 1.4 to 2.7 times better than calculated by SAP. These results were consistent with field measurements obtained elsewhere in Europe and North America, where WWHR technology receives much more credit in regulations and codes.
AIMC4 caused two competitors to join forces and carry out some research of their own:
“I am still amazed with the types of errors.”
Said Tony Gordon CEO of BPD the makers of the Showersave Waster Water Heat Recovery product line, which is well known in Holland.
“Some were really basic, even an algebraic error. These errors are just plain wrong, and need to be fixed. “
Gerald Van Decker, CEO of Power-Pipe Energy Systems, comments:
“When all the errors were found we took the findings to civil servants in DECC who agreed SAP should be changed. They worked with us, and highly regarded independent consultants to jointly come up with a simple recommendation to Lord Bourne to undo the errors without having to change the core of SAP itself. We know that Lord Bourne, to use his words, wants “more breathing
room for builders”, fixing these errors will provide just that, but he has refused to meet with us to discuss how WWHR can help.”
House Builders have to make major changes as they try and make UK homes more energy efficient. By not being given the full benefit of Waste Water Heat Recovery they will need to install other measures which could cost them £0.8 – £2 billion by 2023.