[TRNSYS-users] SDHW example TRNSYS

[Jeff Thornton via TRNSYS-users]

<Why the outlet temperature of solar collector (type 1b) same as
temperature ambient when there is no mass flow rate and irradiance. As
you can see in the table below, ToColl = Tambient) 

If you leave water inside a solar collector and there is no radiation
incident upon the surface and no water flow, it will quickly degrade
towards the ambient temperature. Type1b has no mass (unlike the Tess
Type 539) so it immediately decays to the ambient temperature. 

<How TRNSYS calculate the outlet temperature of the solar collector if
there is no mass flow rate, but only the irradiance available?> 

It solves the same energy balance as it does when there is flow. The
no-flow solution is found when the solar gains match the thermal losses
from the collector (absorbed energy = losses). 

Jeff 

---
Jeff Thornton
President - TESS LLC
22 N. Carroll Street, Madison WI USA 53703
Office: (608) 274-2577 Fax: (608) 278-1475
www.tess-inc.com
E-Mail: thornton at tess-inc.com

On 06/06/2017 9:09 am, Rm Chemilo via TRNSYS-users wrote: 

> Dear all, 
> 
> I want to ask several questions about TRNSYS example solar domestic hot water (SDHW). 
> 
> - Why the outlet temperature of solar collector (type 1b) same as temperature ambient when there is no mass flow rate and irradiance. As you can see in the table below, ToColl = Tambient. 
> 
> - How TRNSYS calculate the outlet temperature of the solar collector if there is no mass flow rate, but only the irradiance available? 
> 
> Thanks. 
> 
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> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
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