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# How to solve the warnings as follow?

The error report show that,

1. * Warning * Calculated design heating load for zone=F1-ADDITIONAL is zero.

* ~~~ * Check Sizing:Zone and ZoneControl:Thermostat inputs.

2. * Warning * SizeDXCoil Coil:Cooling:DX:VariableRefrigerantFlow ADDITIONAL-1 VRF DX COOLING COIL

* ~~~ * ...Gross Rated Total Cooling Capacity [W] will be limited by the minimum rated volume flow per rated total capacity ratio.

* ~~~ * ...DX coil volume flow rate (m3/s ) = 1.241784 * ~~~ * ...Requested capacity (W ) = 36544.966 * ~~~ * ...Requested flow/capacity ratio (m3/s/W ) = 3.397E-005 * ~~~ * ...Minimum flow/capacity ratio (m3/s/W ) = 4.027E-005 * ~~~ * ...Adjusted capacity ( W ) = 30836.470 I have checked sizing zone and zone control:thermostat, but I fial to solve this problem.

Any suggestion is appreciative

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These are not necessarily problems that need to be fixed, but...

For # 1, some zones just have no heating load. You can add some infiltration or a fake cooling load during the winter design day to get a non-zero design heating load.

For #2, you could increase the resulting design air flow rate by raising the value for Zone Cooling Design Supply Air Temperature from 12.5C to something higher, say 14.0 C. Then you won't trip the minimum limit on the Flow/Capacity ratio. The idea is that DX coil models have a range of flow/capacity that is valid and when autosizing the range is enforced, so there needs to be an appropriate balance between air flow rate and cooling capacity.

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Thank you for your helps, rely on your suggestions, I have solved my problems

( 2016-12-29 07:33:22 -0600 )edit

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Last updated: Dec 27 '16