Re: [TRNSYS-users] Type56 problem

[Ben Heymer via TRNSYS-users <trnsys-users@lists.onebuilding.org>]

Thanks for providing more details. It's pretty easy to do some hand calculations of heat loss and compare that to the heat transfer charts in TRNSYS. I did both a TRNSYS model and hand calcs for my own well insulated house (15 cm polyiso insulation) and the results were nearly identical.

The other area to explore is the basement or slab surface of the model. Is the heat transfer there reasonable? You could temporarily delete or disable the slab surface in the model to make sure the above ground surfaces are acting appropriately. Also, double check that the infiltration values are appropriate.

On Wed, Jun 8, 2016 at 10:02 AM, Dragos Bogatu via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:

Ben,

Unfortunately I cannot change the system as I am simulating this model based on a real one. Yes it is true, I could raise the temperature to 30 C, but the problem is that I find the heat loss too high for a highly insulated house. I have the earth to air heat exchanger that brings my temperature to about 10 C during winter (t_put) then the heat recovery unit that brings it to about 20 C (t_rec) and after that an auxiliary heater which brings the temperature to 25 C (with a daily schedule from 8 AM to 8 PM) and the temperature during daytime reaches about 21 C but during the night it goes to about 15 C (considering that the EAHX and the heat recovery unit are still working). The exterior wall is made of 30 cm brick and about 20 cm mineral wool while the windows are triple glazed. Do you think this is normal?

Thank you,

Dragos Bogatu

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