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Re: [EnergyPlus_Support] Temperatures in a water loop
Did you consider bypass branches?
Mit freundlichen Grü�en- Sent from my iPhone (excuse the brevity)
i. A.
Jean Marais
b.i.g. bechtold
Tel. +49 30 6706662-23
On 20.03.2014, at 12:38, <<mailto:fpasserini.tn@xxxxxxxxx>fpasserini.tn@xxxxxxxxx> wrote:
>
> Iâ??m modeling a DHW loop.
>
> PlantLoop,
> DHW Loop, !- Name
> WATER, !- Fluid Type
> , !- User Defined Fluid Type
> DHW Loop Operation, !- Plant Equipment Operation Scheme Name
> Water Heater Use Loop Outlet Node, !- Loop Temperature Setpoint Node Name
> 100, !- Maximum Loop Temperature {C}
> 3, !- Minimum Loop Temperature {C}
> 0.00000283, !- Maximum Loop Flow Rate {m3/s}
> 0, !- Minimum Loop Flow Rate {m3/s}
> 0.015, !- Plant Loop Volume {m3}
> Water Heater Use Loop Inlet Node, !- Plant Side Inlet Node Name
> Water Heater Use Loop Outlet Node, !- Plant Side Outlet Node Name
> Water Heater Use Branches, !- Plant Side Branch List Name
> Water Heater Use Connectors, !- Plant Side Connector List Name
> Demand Inlet Node, !- Demand Side Inlet Node Name
> Demand Outlet Node, !- Demand Side Outlet Node Name
> Demand Branches, !- Demand Side Branch List Name
> Demand Connectors, !- Demand Side Connector List Name
> OPTIMAL; !- Load Distribution Scheme
>
> The water temperature delivered by the municipality is modeled as constantly equal to 15°C:
>
> Site:WaterMainsTemperature,
> Schedule, !- Calculation Method
> temp15C; !- Temperature Schedule Name
>
> Schedule:Compact,
> temp15C, !- Name
> Temperature, !- Schedule Type Limits Name
> Through: 12/31, !- Field 1
> For: AllDays, !- Field 2
> Until: 24:00, 15; !- Field 4
>
> As I would expect, when there is water flow the temperature of the â??Demand Side Outlet Nodeâ?? (Demand Outlet Node) is equal to 15°C: <http://oi60.tinypic.com/2mnq0km.jpg><http://oi60.tinypic.com/2mnq0km.jpg>http://oi60.tinypic.com/2mnq0km.jpg
>
> Among the output data, the water temperature of the â??Plant Side Inlet Nodeâ?? (Water Heater Use Loop Inlet Node) is much higher: <http://oi60.tinypic.com/5zgv9i.jpg><http://oi60.tinypic.com/5zgv9i.jpg>http://oi60.tinypic.com/5zgv9i.jpg
>
> I donâ??t understand why the temperature in the â??Plant Side Inlet Nodeâ?? is higher than the temperature in the â??Demand Side Outlet Nodeâ??. There is no element between them.
> I have found in the .bnd file:
> Plant Loop Return Connection,DHW LOOP,DEMAND OUTLET NODE,WATER HEATER USE LOOP INLET NODE
>
> The water heater is on the supply side and its setpoint temperature is 40°C. No recirculation should occur.
>
> WaterHeater:Mixed,
> Water Heater, !- Name
> 0.1, !- Tank Volume {m3}
> RISC Temp Schedule, !- Setpoint Temperature Schedule Name
> 0, !- Deadband Temperature Difference {deltaC}
> 61, !- Maximum Temperature Limit {C}
> Cycle, !- Heater Control Type
> 1200, !- Heater Maximum Capacity {W}
> , !- Heater Minimum Capacity {W}
> , !- Heater Ignition Minimum Flow Rate {m3/s}
> , !- Heater Ignition Delay {s}
> Electricity, !- Heater Fuel Type
> 1, !- Heater Thermal Efficiency
> , !- Part Load Factor Curve Name
> , !- Off Cycle Parasitic Fuel Consumption Rate {W}
> , !- Off Cycle Parasitic Fuel Type
> , !- Off Cycle Parasitic Heat Fraction to Tank
> , !- On Cycle Parasitic Fuel Consumption Rate {W}
> , !- On Cycle Parasitic Fuel Type
> , !- On Cycle Parasitic Heat Fraction to Tank
> Zone, !- Ambient Te
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