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Coil Bypass Factor problem.

Hi!! I am modeling a large building, this warning presented, please anyone could said me how fix it?

************* Beginning Plant Sizing Calculations
** Warning ** In calculating the design coil UA for Coil:Cooling:Water OS:COIL:COOLING:WATER 3
**   ~~~   ** the coil bypass factor is unrealistically large;
**   ~~~   ** The initial design conditions are: Tair,in = 32.1967
**   ~~~   **                                    Wair,in = 1.759751E-002
**   ~~~   **                                    Twater,in = 7.2200
**   ~~~   **                                    Tair,out = 12.8000
**   ~~~   **                                    Wair,out = 8.500000E-003
Jlerazo's avatar
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Jlerazo
asked 2014-12-19 13:15:24 -0500
Julien Marrec's avatar
29.7k
Julien Marrec
updated 2020-06-09 03:15:10 -0500
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Can you also post how you defined this coil "Coil:cooling:water:os:coil:cooling:water 3"? Is it autosized?

Julien Marrec's avatar Julien Marrec (2014-12-22 06:58:52 -0500) edit

yes, it is autosized.

Jlerazo's avatar Jlerazo (2014-12-22 08:57:13 -0500) edit

Can you include the full definition of this object please? Also, which climate data are you using?

Julien Marrec's avatar Julien Marrec (2014-12-23 03:43:16 -0500) edit

Dear @Julien Marrec, I have the same as described here, I would appreciate it if you help me.

Mehrdad Vojdani's avatar Mehrdad Vojdani (2020-05-31 07:07:07 -0500) edit
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1 Answer

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You might find it helpful to read the engineering reference on the coil bypass factor, here I can't link to the exact paragraph but if you search in your browser for "bypass" you will see the series of equations that are used to calculate the bypass factor. Since your cooling coil is autosized then I suggest that you scrutinize your inputs for the Sizing:Plant and Sizing:System.

Kyle Benne's avatar
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Kyle Benne
answered 2015-01-16 11:50:29 -0500
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