Re: [TRNSYS-users] Average tank temperature

["Matt Duffy" <duffy@tess-inc.com>]

Dear Muhammad Farooq,

There are a few fundamental problems with your simulation before being concerned about the tank temperature. First of all, your heat pumps and pumps do not have any controls - they are simply operating the entire year according to the *.tpf that you sent. I would recommend that you refer to the TESS GHP Example in the ".\Tess Models\Examples\GHP..." directory. Second, you are not using an online plotter device to view your inlet/outlet temperatures, flow rates, etc, thus making it very difficult to see how your system and subsystems are responding. You will likely see that your heat pump is operating outside of the desired range. Last, when you do implement controllers, your timestep is going to have to be much lower as controllers make a decison (on or off) once per timestep.

Best regards,

Matt Duffy

----- Original Message -----
From: "Muhammad Farooq" <engr_farooq85@yahoo.com>
Sent: Tue, August 30, 2011 18:25
Subject: Average tank temperature

hi,

     I have modeled ground source heat pump (type 927) with horizontal heat exchangers (Type 997). I am getting high average tank temperature of 100 degree celcius throughout the simulation results.Also, the maximum heating rate of the element 1(Parameter 20) and maximum heating rate of the element 2 (Parameter 25) of the storage tank (type 60c No heat) has a value of 0,meaning both heat exchangers are turned to zero. 

               can you tell me what parameters of the system's components (ground source heat pump, horizontal heat exchangers or any other parameter) can reduce the average tank temperature to 60 degree celcius. i am sending the TRNSYS file as an attachment.

                                                                                      Muhammad farooq