Discussion

I'm looking for some assistance regarding summertime overheating analysis via Hevacomp. For a specific building, I require to determine the number of areas that will overheat above 25degC for 5% of the occupied time, and also those that will overheat above 28degC for 1% of the occupied time. I've used the CIBSE Guide A method previously, but given the scale of the job this is not practical in this case. I beleive this calaculation is possible in IES but not so sure about Hevacomp. The overheating tool in the Part L module only provides info on overheating above 28degC and there doesn't seem to be any way of modifying the parameters.

Any assistance would be appreciated.

Regards,

Kenny

This option is available in Hevacomp but you need to have the Simulator for it. Under 2006 Regs (L2A) it specified that you must use the CIBSE Design Summer Year which isn't part of the standard Hevacomp weather data and must be purchased from CIBSE.

This requirement has disappeared from 2010 L2A, I believe because the Regs now make you limit the amount of solar gain on the building regardless of comfort.

The option on Hevacomp Simulator is easy to use, it will give you a graph of %of year over the different temps etc. I don't know of a way to do it without that other doing one of the other calcs once a week for a year, putting it in a spreadsheet etc and then you still wouldn't be using the proper weather data anyway.