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[EnergyPlus_Support] How to setup such plan in EnergyPlus
Hi guys,
Is there anybody can help me to have a look how to setup such a ventilation and cooling plan in EnergyPlus. Thanks in Advance.
Regards,
Sharp
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The comfort region on the psychrometric chart is a parallelepiped, the boundaries of which are:
Top: Absolute moisture content = 12 g/kg
Bottom: Absolute moisture content = 0 g/kg (normally it is 4 g/kg but AccuRate will not invoke cooling merely because the air is too dry)
Right: ET* line passing through the point corresponding to (Cooling Thermostat + 2.5) degrees and 50% RH
Left: Not relevant
1. If at the end of the hour the zone temperature without cooling or ventilation is greater than a trigger temperature and greater than the outdoor air temperature - 4 degrees, ventilation is switched on (i.e. windows and other controlled openings in this zone are opened). The trigger temperature is generally 0.5 degrees below the cooling thermostat temperature, but with an upper limit of 26°C.
2. The new zone condition (i.e. temperature and moisture content) is calculated and an indoor air speed is estimated. If the indoor air speed is above 0.2 m/s, the comfort region described above is extended in two ways: the top boundary becomes the 90% RH line, and the right boundary becomes an ET* line passing through the point corresponding to (Cooling Thermostat + 2.5 + dT) and 50% RH, where
dT = 6*(v - 0.2) - 1.6*(v - 0.2)²,
where v is the indoor air speed (m/s). An upper limit of 1.5 m/s is imposed on the indoor air speed.
If the zone condition with natural ventilation is within the extended comfort region, cooling is not invoked.
3.If the zone condition with natural ventilation remains outside the extended comfort region, and ceiling fans are available in that zone, the indoor air speed calculated from natural ventilation is replaced by an indoor air speed appropriate to the number of fans and zone floor area (based on the cooling benefit of ceiling fans - see Zone details). If the zone condition with ceiling fans and natural ventilation is within the extended comfort region, cooling is not invoked.
4.If the zone condition with ceiling fans and natural ventilation is still outside the extended comfort region, the zone openings are closed, ceiling fans (if any) are switched off, and sufficient cooling is applied so that the zone temperature at the end of the hour is the cooling thermostat setting.
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