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unexpected PMV results

asked 2015-07-16 05:58:42 -0600

thiathia's avatar

updated 2015-11-07 17:40:52 -0600

Hi! The PMV results I get after running a simulation with open studio are not normal (-20 and more ) . What can be the problem?

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More information on inputs used would be helpful.

David Goldwasser's avatar David Goldwasser  ( 2015-07-16 09:58:56 -0600 )edit

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answered 2015-07-30 19:13:44 -0600

updated 2015-07-30 19:21:51 -0600

The Engineering Reference in the Fanger Comfort Model section shows the detailed calculation of PMV. This model is based on the zone conditions (T and w) as well as the schedules used for activity level, work efficiency, clothing level, and air velocity. Any one or more of these values will affect the resulting PMV. The first step in diagnosing the simulation results would be to report the zone temperature and relative humidity. Keeping the zone conditions within the comfort zone would be one of the first things to implement. The clothing schedule and air velocity schedule would be the second things to look at to ensure the occupants are wearing the correct apparel and see the expected skin air velocity. Then the choice of work efficiency for the type of zone being modeled would be a final check of the model inputs (see People object for model inputs).

PMV = ThermSensTransCoef*(IntHeatProd - EvapHeatLoss - RespHeatLoss - DryHeatLoss)

where:

ThermSensTransCoef = 0.303*EXP(-0.036*ActLevel) + 0.028 (activity level is scheduled)

IntHeatProd = ActLevel - WorkEff; (both scheduled)

EvapHeatLossRegComf = 0.42*(IntHeatProd - ActLevelConv)

EvapHeatLossDiff = 0.4148*(SkinComfVpress - VapPress)

EvapHeatLoss = EvapHeatLossRegComf + EvapHeatLossDiff

LatRespHeatLoss = 0.0023*ActLevel*(44. - VapPress)

DryRespHeatLoss = 0.0014*ActLevel*(34.- AirTemp)

RespHeatLoss = LatRespHeatLoss + DryRespHeatLoss

ConvHeatLos = CloBodyRat*Hc*(CloSurfTemp - AirTemp) (clothing level is scheduled)

RadHeatLoss = RadSurfEff*CloBodyRat*SkinEmiss*StefanBoltz*(AbsCloSurfTemp**4 - AbsRadTemp**4)

DryHeatLoss = ConvHeatLoss + RadHeatLoss

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Asked: 2015-07-16 05:58:42 -0600

Seen: 276 times

Last updated: Jul 30 '15