[TRNSYS-users] indoor temperature is unstable

[zhichen]

Thanks, Toni.


I will carefully check my windows’ configuration and  set ground temperature in another way to see if there any improvements.


Regards,
Zhichen 



发自我的iPhone


------------------ Original ------------------
From: Toni Calabrese via TRNSYS-users <trnsys-users at lists.onebuilding.org>
Date: Thu,Jul 15,2021 1:51 PM
To: TRNSYS users mailing list at OneBuilding.org <trnsys-users at lists.onebuilding.org>
Cc: Toni Calabrese <toni.calabrese at ost.ch>
Subject: Re: [TRNSYS-users] indoor temperature is unstable



  
Hi Zhichen,
 
I think that two are the crytical point that you should check and they are:
 
1.      Influence of the window. In your experimental room there is a window if I am not wrong. Did you check in your  model if all the parameters of the window (g value, U value, shading control) are implemented correctly?
 
2.      As I understand in your model, you set the ground temperature to 5°C, correct? Why did you implemented like this?  I think that the real ground temperature under the room is pretty different and follows the behavior of the outside temperature in terms of annual oscillations and not a constant value….
 
 
 
Are my comments useful or did I not understand what/how you implemented everything in your model?
 
 
 
 
 
 
 
 
 
From: TRNSYS-users  <trnsys-users-bounces at lists.onebuilding.org> On Behalf Of ??? via TRNSYS-users
 Sent: Thursday, July 15, 2021 5:32 AM
 To: trnsys-users <trnsys-users at lists.onebuilding.org>
 Cc: 大大宝 <805520662 at qq.com>
 Subject: [TRNSYS-users] indoor temperature is unstable
 
 
  
Dear TRNSYS users, 
 
  
 
 
  
I am validating my model with a experimental room (room). The room has a floor heating system and I simulated the indoor temperature in the case of floor heating turning off. 
 
  
 
 
  
I input the collected weather data(weather1.txt) into the simulation (room.b18 & room.tpf). 
 
  
 
 
  
I compared my simulated indoor temperature with the measured one. I found that the simulated indoor temperature is unstable when the measured temperatures fluctuate similarly for each day (indoor temperature.png). I just don't known what  would contribute to this mismatch when they shared the same weather condition. 
 
  
 
 
  
Have anyone faced this problem before? any ideas to figure out this mismatch?
 
  
 
 
  
I will very appreciate for any helps!
 
  
 
 
  
Regards,
 
  
Zhichen
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