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Re: [EnergyPlus_Support] Re: Energyplus IDF for hybid ground source heat pump



Hello,

I have modeled a system in EnergyPlus where you couple a boiler and cooling tower to a plant loop.  The attached file shows the setup.  I believe you could do something similar with a GLHX, just replace the boiler with the GLHX, and change your operation schemes to allow the ground loop to do cooling as well.

One note of caution: the attached file uses a HeatExchanger:WatersideEconomizer to link the PlantLoop and CondenserLoop.  I have found this object to be problematic in the current version of EnergyPlus, as it does not transfer all energy to the CondenserLoop.  In other production projects I am using instead a water-cooled chiller with a very high COP in order to link the two loops.

Hope this helps,

--
Karen

On Wed, Aug 3, 2011 at 11:35 PM, Xing <xing.shi.2006@xxxxxxxxx> wrote:
 

The system is located near Nanjing, China. Usually, the GSHP in this area cannot achieve heating and cooling balance. If we design GSHE based on the larger cooling load in summer, it will result in excessive GSHE in winter, meaning large initial cost (more bore holes, longer pipes, etc.).

A common way is to combine a second loop into the system, using a cooling tower to provide needed cooling capacity in summer. The warm water coming out of condenser is split into the GSHE and the cooling tower. This is the basic idea.

We just don't know how to model this in EnergyPlus.

Thank you!



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
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> I cannot visualize what you are doing. GSHP uses a GS Heat exchanger to cool the condenser coil of the HP. The tower method is the usual way to cool a chiller, which can be a HP.. If you wanted to run the tower and the GSHE at the same time, there must be a reason. If the GS heat exchanger does not have enough capacity, you wanted to connect the GSHE cooling water to the towerl. Is that the problem? GSHE is a closed loop water system. Cooling tower method let the condenser coil evaporate some water with a fan or funnel to carry away the water vapour. How is your hybrid system designed? Dr. Li
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: xing.shi.2006@...

> Date: Wed, 3 Aug 2011 07:35:12 +0000
> Subject: [EnergyPlus_Support] Energyplus IDF for hybid ground source heat pump
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> I am working on using EnergyPlus to simulate a hybrid ground source heat pump (with a cooling tower). We ran into some difficulties. Just wondering where we can find an example IDF we can learn from. EnergyPlus official website offers a web-based example IDF generator but we couldn't find hybrid ground source heat pump there.
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> Thanks!
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Attachment not found:
d:\eudora\attach\WLHP CT.idf