[TRNSYS-users] Type 1231 with type 700 and type 941

[Mukhtar Abeid]

Hi Meriam

I'm interested in your model, but what's about the heat transfer through
the ground.

Good luck

في السبت، ٢٦ يونيو ٢٠٢١ ٠٠:١١ miriam di matteo via TRNSYS-users <
trnsys-users at lists.onebuilding.org> كتب:

> Dear all, I'm modeling on Trnsys an radiators heating system of a 3 story
> building from the 1980s. I'm using the Type 1231 as radiators and type 700
> as Boiler. Types 1231 are connected by Type 56 as internal gain(0.8
> convective; 0.2 radiative).
> I have two questions / problems:
>
> 1) The internal rooms temperatures are below 20°C (comfort temperature)
> when the system is on.  I don't understend why.
> The parameters and input are:
> Type 700
> -Rated Capacity  248400 kJ/hr (69kW)
> -Minimum Turn-Down Ratio 0.51; If I understod right it is the ratio
> between minimum and maximum Boiler capacity. (35kW/69kW)
> - Intel fluid tempertature: i connected this input with radietors outlet
> temperature trought a mixing valve (type 649);
> - Intel fluid flowrate: like intel fuid temperature.
> - input control signal: the system work from 14.00pm to 22.00pm
> - set point temperature : 80 °C
>
> Type 1231
> I inserted 13 different Type 1231, one per appartament.
> - Design surface temperature is 65°C
> - Design Air temperature is 20 °C
> - I calcolate the flowrate as (radiator capacity)/(Cpw*deltaT)
> deltaT=Tin-Tout=20°C, for each type 1231
>
> 2) I want to replace the boiler with a heat pump (A-W HP Type 941) but
> leaving the existing radiators.
> do i have change the type 1231 parameters?
> For example Tsd from 65°C to 50/45°C?
>
> Thanks a lot to everyone,
> Best regards
> Miriam
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>
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