Dear Officer of Trnsys:
I have encountered an abnormal problem when using type 170a & type 170 d. A detailed description is shown below. Please check if it's a programming bug.
Type 170a:
When parameters are set as the table below and leave other parameters as default, the output of the Required cooling water flow rate is 1.417,
|
Number of cells in series per stack |
100 |
|
Electrode area |
7500 |
|
Current needed from stack |
1000 |
While if set Electrode area to 8500, the Required cooling water flow rate would be 11.18, which is an abnormal increase.
The table below shows outputs under other conditions, the heat energy calculated according to the water flow rate and temp rise, and the power out given by the unit.
|
Electrode area |
Required cooling water flow rate (m3/hr) |
Calculated heat(default TEMPrise = 20 C)/ FC Power out(W) |
|
9000 |
4.344 |
101118(W)/83279 |
|
8400 |
42.02 |
978134/82707 |
|
8300 |
0 |
0 |
|
8200 |
0 |
0 |
|
8100 |
0 |
0 |
|
8000 |
0 |
0 |
|
7900 |
0.3359 |
7819/82189 |
|
7800 |
0.7451 |
17344/82081 |
|
7200 |
1.753 |
40805/81388 |
|
7000 |
1.900 |
44227/81141 |
The above trend of hot water flow rate change with the Electrode area is abnormal, the hot water flow rate between 8000 and 8300 should not be 0.
Similar mistakes happen in Type 170d:
When parameters are set as below:
1: Number of cells in series per stack 100
2: Number of stacks in parallel per module 25
3: Electrode area 8000
4: Required Current 1000
The hot water flow rate is 0.
When parameters are set as below:
1: Number of cells in series per stack 100
2: Number of stacks in parallel per module 2
3: Electrode area 7500
4: Required Current 1000
The hot water flow rate is 0.
Best regards,
XH Zhang