Re: [TRNSYS-users] TRNSYS model and simulation

[thornton@tess-inc.com]

On 2023-03-31 03:30, ARCHIT MAHAWAR 19BME0489 via TRNSYS-users wrote:

> Here the TRNSYS model and simulation results have been attached. The
> results needed should be temperature within 55 to 60 deg C. The blue
> line denotes the AVG TANK TEMP and red line shows TANK OUTLET TEMP.
> The red line has max temp of 48 deg C and is not falling within the
> required temp range.
> This model is for a solar assisted heat pump for hot water generation.
> Can anyone suggest whether a thermostat should be used and how to
> connect it.

From your TRNSYS schematic, I can see that you are probably very new to 
TRNSYS.  So let me first ask you a question that we ask many of our 
TRNSYS students.  If you built this system in real life would it work?  
The answer is no for several reasons.

1) You have no pumps to move fluid between the collector/tank and the 
tank/heat pump and no control of the pumps.
2) You have no control of the solar collectors.
3) Your thermostat is sensing the device that it is turning on and not 
sensing the device .
4) You are using a water-source heat pump to make hot water and while 
that's not unheard of, most systems like this would use an air-to-water 
heat pump as they are designed to provide higher temperature hot water.

I would strongly suggest that you review the SDHW example in TRNSYS as 
it is somewhat relevant and also consider taking an online TRNSYS 
training course (they are relatively inexpensive and VERY helpful).

TRNSYS is a powerful tool but it is not the easiest to pick up right out 
of the box.  Good luck with your simulations!

Jeff

----
Jeff Thornton
President
Thermal Energy System Specialists (TESS)
3 N. Pinckney Street - Suite 202
Madison WI 53703
(608) 274-2577
www.tess-inc.com