Re: [TRNSYS-users] problem about type 121b auxiliary heating

[Jay Zhu <zhujiang1124@gmail.com>]

Dear Mr Duffy :

Sorry to make you misunderstanding.

i intend to make the heating not working, then i set the heating point as a low level instead of a normal 20 C.

because i wanna see the comparison and differences between the case with type 121 and without type 121, as i said i made the heating not running,

So i meaned the results for the two cases should be the same, the type 121 which is added for heating doesnt running.

 

However, cooling consumption of the case with type 121(but i set it not work at all ) is lower than the case wihout it, and the plot for the room temperature is also different.

 

Thank you !

On Tue, Mar 29, 2011 at 9:13 AM, Matt Duffy <duffy@tess-inc.com> wrote:

Dear Jay Zhu,

"but i set heating point of the thermostat  as low as 5 C, it means the heating will still not running based on the Tampa, Fl weather condition. "

Tampa, FL is a moderately warm climate - I don't think the ambient temperature would ever drop below 5 C. Thus, that is probably why the control signal to your furnace is not going on.

When we teach TRNSYS to new users, we always stress to take their simulation one component at a time. Using the online plotter, dynamically watch what is going into the component (outputs of other components) and what is going out of the component. Thus, watching the control signals, flow rates, and temperatures into/out of your component of interest with the Type65 online plotter, will shed some light on what is happening in your system.

Best regards,

Matt Duffy

----- Original Message -----
From: "Jay Zhu" <zhujiang1124@gmail.com>
Sent: Mon, March 28, 2011 22:35
Subject: [TRNSYS-users] problem about type 121b auxiliary heating

Hey There:
I tried to use unitary air conditioner type 651 (for cooling) and type 121 auxiliary heating  (for heating) to connect with type 56 house controlled by thermostat type 108 , i found a very curious result after testing these types by adding and deleting them

First time, When i totally delete the type 121, make the system runs, the simulation obvious will show the cooling only.
Second time, when i add the type 121 auxiliary heating, but i set heating point of the thermostat  as low as 5 C, it means the heating will still not running based on the Tampa, Fl weather condition.  So the result will shows the cooling only also without heating.  

it is supposed the plot for these two cases should be exactly same in my opinion. However, cooling consumption of the second case with type 121(but i set it not work at all ) is lower than the first case, and the plot for the room temperature is also different.

Am i wrong somewhere ? i am so confused for this problem. Thank you in advance

I changed my simulation to air source heat pump now, but i still wanna know what the exactly problem is for the two simulation cases

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