I'm modelling the server rack room of data center, using the ElectricEquipment:ITE:AirCooled for rack simulation.
I use the model 2ZoneDataCenterHVAC_wEconomizer.idf of EnergyPlus and change the value from 200 to 1000 Watts/m2 in Field Watts per Zone Floor Area of ElectricEquipment:ITE:AirCooled.
I used Output:Diagnostics, DisplayAllWarnings and Output:Diagnostics, DisplayExtraWarnings and received the severe errors below:
** Severe ** Temperature (high) out of bounds (210.55] for zone="WEST ZONE", for surface="ZN001:ROOF001W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** ~~~ ** Zone="WEST ZONE", Diagnostic Details:
** ~~~ ** ...Internal Heat Gain [1001.699] W/m2
** ~~~ ** ...Infiltration/Ventilation [0.000] m3/s
** ~~~ ** ...Mixing/Cross Mixing [0.000] m3/s
** ~~~ ** ...Zone is part of HVAC controlled system.
** Severe ** Temperature (high) out of bounds (230.00] for zone="WEST ZONE", for surface="ZN001:FLR001W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** Temperature (low) out of bounds [-135.02] for zone="WEST ZONE", for surface="ZN001:ROOF001W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** Temperature (high) out of bounds (202.37] for zone="WEST ZONE", for surface="ZN001:WALL001W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** Temperature (high) out of bounds (202.37] for zone="WEST ZONE", for surface="ZN001:WALL003W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** Temperature (high) out of bounds (218.11] for zone="WEST ZONE", for surface="ZN001:WALL002W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** Temperature (high) out of bounds (218.11] for zone="WEST ZONE", for surface="ZN001:WALL004W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** Temperature (low) out of bounds [-109.21] for zone="WEST ZONE", for surface="ZN001:FLR001W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** Temperature (low) out of bounds [-1339.92] for zone="WEST ZONE", for surface="ZN001:WALL001W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** Temperature (low) out of bounds [-2153.29] for zone="WEST ZONE", for surface="ZN001:WALL002W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** Temperature (low) out of bounds [-1339.91] for zone="WEST ZONE", for surface="ZN001:WALL003W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** Temperature (low) out of bounds [-2153.29] for zone="WEST ZONE", for surface="ZN001:WALL004W"
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Severe ** CalcHeatBalanceInsideSurf: The temperature of 28095.56 C for zone="WEST ZONE", for surface="ZN001:WALL001W"
** ~~~ ** ..is very far out of bounds during warmup. This may be an indication of a malformed zone.
** ~~~ ** During Warmup, Environment=WHOLEYEARDAY, at Simulation time=01/01 02:45 - 02:46
** Fatal ** Program terminates due to preceding condition.
*************
************* ===== Final Error Summary =====
************* The following error categories occurred. Consider correcting or noting.
************* Temperature (low) out of bounds
************* ..A temperature out of bounds problem can be caused by several things. The user should check:
************* ..1) the weather environment (including the horizontal IR from sky)
************* ..2) the level of interal gains with respect to the zone
************* ..3) the thermal properties of their materials. And other things.
************* ..A common cause is a building with no or little thermal mass - all materials with Material:NoMass definitions.
************* Temperature (high) out of bounds
************* ..A temperature out of bounds problem can be caused by several things. The user should check:
************* ..1) the weather environment (including the horizontal IR from sky)
************* ..2) the level of interal gains with respect to the zone
************* ..3) the thermal properties of their materials. And other things.
************* ..A common cause is a building with no or little thermal mass - all materials with Material:NoMass definitions.
*************
I think that my dx cooling coil (my model) could not maintain the air temperature in the zone because the power is high. Can someone give me the advice to solve this errors and modify the cooling coil to maintain the high loads?
Thank all your support.
