[TRNSYS-users] control problem for type 927

[Jeff Thornton]

Emre,

Your timestep is one hour and you have NO thermal capacitance in either of your water loops.  Add some realistic pipes to your model and get the timestep down to around a minute and you should see a noticeable improvement in the control and operation of your system.  You should also take a look back through the mailing list archives and read the detailed responses that have been posted about controlling HVAC equipment.

Jeff

Sent from my iPhone

> On Aug 17, 2019, at 8:44 AM, Emre Arpaci via TRNSYS-users <trnsys-users at lists.onebuilding.org> wrote:
> 
> Hi trnsys users
> I have a new problem. :) 
> 
> I m heating a greenhouse with a heat pump.I m currently trying to control this heat pump. I want to work  this heat pump when temperature is below 8 degree and stop that heat pump when temperature rises 8 degree in the greenhouse. To make it I used five stage room thermostat. I connected grenhouse temp to monitoring temperature of thermostat and entered 8 degree value for 1 stage heating setpoint. But I got this error messagas in the figure.
> I connected control signal for 1 st stage heating in the thermostat to fan coil and heat pump as you see in the picture.
> 
> Now how can ı control to start and stop of this heat pump as I want. Because I don't want this heat pump to work for 24 hours. I tried the differentual equation control but I got the same error messages.
> 
> I added also my deck file.
> Please help me.
> Thanks
> Regards
> 
> 
> 
> <deck.txt>
> <heatpump4.jpg>
> <heat5.jpg>
> <heatpump1.jpg>
> <heatpump2.jpg>
> <heatpump3.jpg>
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