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