Hi
I am modelling an existing flat in UK where the DHW is provided by an electric immersion tank.
How should I define such system in Apache Systems? Is it correct if I set the UK NCM wizard as "GENERIC Heating only - Electric resistance", then tick the box "DHW served by the ApacheHVAC boiler"? What can I assume to be the delivery efficiency? And why, if these assumptions are correct, the electricity consumption that I obtain from the simulation is far above the actual one given by the utility bills?
Any help would be greatly appreciated!
Michela
Electric DHW immersion tank
Re: Electric DHW immersion tank
Hi Michela, are you doing a Part L/Section 6 assessment or an EPC? If it's for an EPC, it might be worth contacting your accreditation scheme.
I think that for IES you can ignore the system type, as long as the heating fuel is correct. Delivery efficiency is the sum of storage + circulation losses. It can be either assumed as a figure, or set to 100% and account for detailed storage and circulation losses in the fields below.
I'm not sure why your DHW usage is high without looking at the model, but I remember once I had the "changing facilities" NCM activity assigned to a vast changing area, only to find out that it's only actually supposed to include showers and smaller changing areas associated with them. This reduced DHW use to a great extent.
I think that for IES you can ignore the system type, as long as the heating fuel is correct. Delivery efficiency is the sum of storage + circulation losses. It can be either assumed as a figure, or set to 100% and account for detailed storage and circulation losses in the fields below.
I'm not sure why your DHW usage is high without looking at the model, but I remember once I had the "changing facilities" NCM activity assigned to a vast changing area, only to find out that it's only actually supposed to include showers and smaller changing areas associated with them. This reduced DHW use to a great extent.