Hi,
Please would someone be able to help me. I have been trying to complete an SBEM for a client and this one part of the BRUKL document won't show up when I run the compliance section of the Part L in Hevacomp.
On the roof of the building in question there is 1 solar thermal panel. When myself and my colleagues tried to input the data for this in the Part L of Hevacomp and then run the compliance to get the BRUKL document, nothing shows up under the 'Energy Production by Technology [kWh/m3]' table. The solar thermal system is just not showing up with anything, yet it is picking up our solar PV. What myself and 2 of my colleagues don't understand is why this is not showing up on the document. We have been fiddling around with all the settings and data in the Part L of Hevacomp and I have followed this how to page from Bently: http://communities.bentley.com/products/building/performance/w/building_performance__wiki/24566.solar-collectors but it's still not showing up on the document and it's infuriating.
Please can someone advise on how to do this please.
Thank you.
Good afternoon,
Could you please clarify if you are looking to model Solar Collectors or a Solar Thermal System for your HWS?
Shane Regan | Principle Building Performance Support Engineer
In that case I will need to take a look at the project to determine the reason for this.
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I can confirm that the calculation is working fine but the figures are so low that zero is being displayed. One reason for this is that the Solar storage cylinder is completely uninsulated. Changing this to 200mm factory insulation, for example, increases the figure in the Compliance report above zero straight away. Likewise for the Distribution Pipes. Also, please note that because the Collector Loop Heat Exchanger data has been set to default SBEM will take pessimistic values for this.
However changing all of the above will only provide marginal improvement so I would recommend checking your storage options, as these can have a huge impact. For example, including storage of 800l with your DHW 'Boiler System', and then selecting a 400l Combined cylinder for your Solar storage will greatly increase the result. After doing so this will also increase the effectivenss of additional panel area.
Please note that the above is general guidance and I would strongly recommend getting in touch with your accreditation scheme providers as they will be much better placed to offer specific design advice.
Answer Verified By: Stephen Brown