Heating profile for residential

ApacheCalc – Heat loss/gain calculations using CIBSE procedures to determine design heating/cooling loads.
ApacheLoads – Design heating/cooling loads calculations using ASHRAE Heat Balance Method.
mcbni
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Heating profile for residential

Postby mcbni » Mon Sep 07, 2015 11:45 am

Hello,

I am working in a residential project which needs an SBEM calculation and I have a question in relation with the heating profile. As the building is formed with different homes, in reality each is going to be heated depending on the owner wishes. But I need to simulate if in theory.

First, I chose a heating profile which would work 2 h in the morning and 4h in the afternoon in Winter season and dependending on if the temperature is less than 20 for Summer season. The set temperature was 21 degrees. The loads were 0.00 kw.

Then, I chose an "on continuously" heating profile and then set the temperature to timed (2 h in the morning and 4h in the afternoon in Winter season and dependending on if the temperature is less than 20 for Summer season). I got a very low load for this simulation.

Finally, I tried setting "on continuously" for the heating profile and 21 degrees as a set point. In this case, I got an expected load but I think the simulation is not very real as the system was considered to be on continuously.

Any idea of how to simulate the building operation?

Thanks

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Terence
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Re: Heating profile for residential

Postby Terence » Mon Sep 14, 2015 10:20 am

I think you should not be using VE-SBEM for this analysis. Firstly, because it is for non-domestic only and domestic properties should be assessed under Part L1 (SAP). Secondly, SBEM is a compliance tool, not a design tool.

See paragraph 173 – 174 of the NCM Modelling Guide

http://www.ncm.bre.co.uk/filelibrary/NCM_Modelling_Guide_2013_Edition_06April2014.pdf

For UK Compliance the occupancy and other inputs must be the same for each building and as such they can’t be edited by the user.

I would recommend reading the following post on our user forum as it explains the difference between the Real Building and the Actual & Notional Buildings used for Part L2 Compliance

http://bit.ly/HkSPgf

UK Compliance should really only be used a guide and should not be used as a basis for making design decisions for your building. If you want to learn more about this then read the following article on “Closing the performance gap” - http://www.iesve.com/discoveries/article/closing-the-performance-gap
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