You mentined that a boiler and chiller running the four pipe ssystem, and then add the heat pump.
If the heat pump is to heat the boiler, then the heat supply is still the same.
If it is a commn boiler, then there are two coils heating it. I do not know how the heat supply are controlled. Normally, it is water to water heatpump with an auxiliary heater arrangement. The heat supplied by the pump and the auxilaiary heater would be the same as the other heat source alone.
For cooling, the heat pump replaces he chiller with the same capacity.
There may be slight differences due to the different efficiency of the systems. My answer is general and is not restricted only to EPlus simulation.
Any extra supply capacity is not fed to the demand coils, and either by-passed.or by stopping the heting/cooling system. That is the reason for providing the storage tank.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: kapitalos@xxxxxxxxxxx
Date: Wed, 25 Aug 2010 20:38:52 +0000
Subject: [EnergyPlus_Support] Re: Problem modelling geothermal heat pumps
I didn't make myself clear. I want to lower the boiler/chiller characteristics.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
>
>
> I have no idea. Why should a pump changes the building heating/cooling characteristic.
>
> That is why you have a bypass loop.
>
> Dr. Li
>
>
>
>
>
>
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: kapitalos@...
> Date: Sat, 21 Aug 2010 21:25:42 +0000
> Subject: [EnergyPlus_Support] Problem modelling geothermal heat pumps
>
>
>
>
>
>
> Hello all.
>
> For a project in my university, i have to model a geothermal heat pump in a building, in order to lower heating and cooling loads.
>
> I simulated the building at first, 4 zones, each with a fancoil (heating and cooling) connected to a hot boiler and a chiller. Up to this point everything is working fine.
>
> When i try to model a pump in that system, whatever the case, there seems to be no effect in the capacity of the boiler and the chiller. I've tried water to water, water to air, nothing works.
>
> Maybe i am missing some point in all this. Can anyone care to explain what the strategy should be in order to achieve lower loads?
>
> Thanks, Michael.
>
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
>
>
> I have no idea. Why should a pump changes the building heating/cooling characteristic.
>
> That is why you have a bypass loop.
>
> Dr. Li
>
>
>
>
>
>
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: kapitalos@...
> Date: Sat, 21 Aug 2010 21:25:42 +0000
> Subject: [EnergyPlus_Support] Problem modelling geothermal heat pumps
>
>
>
>
>
>
> Hello all.
>
> For a project in my university, i have to model a geothermal heat pump in a building, in order to lower heating and cooling loads.
>
> I simulated the building at first, 4 zones, each with a fancoil (heating and cooling) connected to a hot boiler and a chiller. Up to this point everything is working fine.
>
> When i try to model a pump in that system, whatever the case, there seems to be no effect in the capacity of the boiler and the chiller. I've tried water to water, water to air, nothing works.
>
> Maybe i am missing some point in all this. Can anyone care to explain what the strategy should be in order to achieve lower loads?
>
> Thanks, Michael.
>
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