[TRNSYS-users] Inlet temperature of FP Collector

[Rm Chemilo]

<Thank you for your explanation. Actually, my main problem is with TES and
I thought by controlling the inlet temperature of solar coll can help to
maintain the low temperature of fluids inside the TES. So, I already got
the right amount of TES energy gain to meet the demand, but the problem is
the high temperature inside TES. I need to maintain the low temperature
inside TES but also produce high energy gain. Do you have any suggestion
what should I do?>

<Maintaining high energy gains while maintaining low temperatures is
difficult unless you have great stratification and/or a very large
storage.  Why are you trying to maintaain low storage temperatures?>
I'm using the large scale storage with 30 temperature levels of
stratification. On the attachment you can see the temperature profile
inside the TES.

The reason I'm trying to maintain low storage temperature is because the
needed temperature to deliver into the residents is only around 60C.


<I have another question still regarding SHW. I created another SHW
simulation and it consists of solar coll, TES, heat pump, and buffer tank.
The water to water heat pump (type 927) component acts as auxiliary heating
when the heat from solar coll is not sufficient. After I run the
simulation, the heat pump works but the outlet temperature really high. I
only need to increase the temperature from 40C to 60C but it goes up to
90C. What control should I apply for this problem?>

<Are you charging the buffer with the heat pump or are you charging the
main storage?  Typically you'd use an aquastat that watcxhes the tank
temperature and turns on/off the heat pump.>

I'm charging the buffer tank with the heat pump. And for the main storage
I'm charging it with the flat plate.

Aquastat controller:
Upper input temperature Th - Outlet load temperature (heat pump)
Lower input temperature Tl - Temperature to heat source (buffer)
Monitoring temperature Tin - Temperature to load (buffer)
are these connections correct?



 [image: Inline image 1]


On Tue, Oct 31, 2017 at 9:01 AM, Jeff Thornton via TRNSYS-users <
trnsys-users at lists.onebuilding.org> wrote:

> <Thank you for your explanation. Actually, my main problem is with TES and
> I thought by controlling the inlet temperature of solar coll can help to
> maintain the low temperature of fluids inside the TES. So, I already got
> the right amount of TES energy gain to meet the demand, but the problem is
> the high temperature inside TES. I need to maintain the low temperature
> inside TES but also produce high energy gain. Do you have any suggestion
> what should I do?>
>
> Maintaining high energy gains while maintaining low temperatures is
> difficult unless you have great stratification and/or a very large
> storage.  Why are you trying to maintaain low storage temperatures?
>
> <I have another question still regarding SHW. I created another SHW
> simulation and it consists of solar coll, TES, heat pump, and buffer tank.
> The water to water heat pump (type 927) component acts as auxiliary heating
> when the heat from solar coll is not sufficient. After I run the
> simulation, the heat pump works but the outlet temperature really high. I
> only need to increase the temperature from 40C to 60C but it goes up to
> 90C. What control should I apply for this problem?>
>
> Are you charging the buffer with the heat pump or are you charging the
> main storage?  Typically you'd use an aquastat that watcxhes the tank
> temperature and turns on/off the heat pump.
>
> Jeff
>
>
>
>
> ---
> Jeff Thornton
> President - TESS LLC
> 22 N. Carroll Street, Madison WI USA 53703
> Office: (608) 274-2577  Fax: (608) 278-1475www.tess-inc.com
> E-Mail: thornton at tess-inc.com
>
> On 10/26/2017 2:07 am, Rm Chemilo via TRNSYS-users wrote:
>
> Thank you for your explanation. Actually, my main problem is with TES and
> I thought by controlling the inlet temperature of solar coll can help to
> maintain the low temperature of fluids inside the TES. So, I already got
> the right amount of TES energy gain to meet the demand, but the problem is
> the high temperature inside TES. I need to maintain the low temperature
> inside TES but also produce high energy gain. Do you have any suggestion
> what should I do?
>
> I have another question still regarding SHW. I created another SHW
> simulation and it consists of solar coll, TES, heat pump, and buffer tank.
> The water to water heat pump (type 927) component acts as auxiliary heating
> when the heat from solar coll is not sufficient. After I run the
> simulation, the heat pump works but the outlet temperature really high. I
> only need to increase the temperature from 40C to 60C but it goes up to
> 90C. What control should I apply for this problem?
>
>
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> TRNSYS-users mailing listTRNSYS-users at lists.onebuilding.orghttp://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>
>
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