[TRNSYS-users] An abnormal problem occurs in type 170a & 170d

[张潇寒]

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
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