IES-VE User Forum

Does anybody have any previous experience of comparing overheating results between IES and 4DFlo (the software Breathing Buildings use internally)?

We have used the Breathing Buildings plug in modules for the S1200 units within IES, but we cannot achieve as good a result as Breathing Buildings are ...

Hi Terence,

Thanks for your response - I also contacted CIBSE Certification and they have confirmed what you have said - but how does IES account for the 5% reduction in heat generator efficiency when DHW is generated by the HVAC system's heat generator as required on page 93 of the SBEM technical ...

Should both DHW delivery efficiency and circulation losses be included?

IES Guidance on the knowledge base states:

'If secondary circulation and/or storage losses are used, then the DHW delivery efficiency should be set to 1. Otherwise the losses are accounted twice.'

https://www.iesve.com ...