[TRNSYS-users] Type2b

[Flynn Ciaran]

Hello,

After having read the documentation and online help, I am still having trouble with the type 2b and I was wondering if you could please help me out. My problem is the following:

I used the example file SDHW, where the Type2b is connected as follows:
Upper limit TH = solar collector output temperature
Lower limit TL = tank to heat source temperature
Monitoring temperature TIN = tank to load temperature
Upper deadband ΔTH = 15 degrees
Lower deadband ΔTL = 0 degrees

Then I went through the documented equations (Eq. 4.1-1 to Eq.4.1-4). However in the simulation results, when I take a look at time steps 4064.25 to 4065 (as an example), I find the following:

Time step


4064.25


4064.5


4064.75


4065


(TH-TL)


-1.373


7.008


1.618


2.304


γi


0


0


0


1


γo


0


0


1


1


>From what I see, time step 4064.75 does not agree with Eq. 4.1-3 since (TH-TL) is still below the upper deadband even though the controller is turned on (it should remain off until (TH-TL) is greater than or equal to the upper deadband). Maybe I am misreading the input/output controller values?

Any help would be greatly appreciated.
Thanks,
Ciaran


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