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How to model a Water Sourced Heat Pump (wshp) with a cooling tower on a condenser loop?

asked 2015-04-15 11:41:11 -0500

MatthewLynch's avatar

updated 2015-07-12 14:12:05 -0500


I am building an Open Studio model that requires multiple water sourced heat pumps that are located throughout a two story office building and are on a condenser loop with a cooling tower. The wshp models are:

My issue is that the heat pump model only allows for evaporative cooling and once a water sourced loop is chosen, a Chiller is required.

My question is: how has this been modeled in the past? If there is a solution with the HVAC Systems layout tab within Open Studio that would be preferable!

Thank you,


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answered 2015-04-15 12:10:34 -0500

You can create a condenser loop, add a cooling tower and boiler on it, and then connect "Water to Air HP" coils to it (see below).

image description

When you add a "Water to Air HP" in a zone it gives you the option on the top to connect it to loops, choose the condenser loop you created.

image description

Also, you can use the script on the BCL called "WSHP with DOAS (More Design Parameters)". This will build the system and then you can edit it as you wish in OS.

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Taylor, thank you for answering my question!


MatthewLynch's avatar MatthewLynch  ( 2015-04-16 15:03:13 -0500 )edit

Taylor, I had a follow up question as well.

There are about 16 package roof top units feeding one thermal zone in the same facility. So, my question is can you add multiple air loops to one thermal zone? When I attempt to add a thermal zone to a new Package roof top unit Open Studio deletes that thermal zone from my other package roof top units.

Thank you in advance!


MatthewLynch's avatar MatthewLynch  ( 2015-04-16 17:36:04 -0500 )edit

Can someone provide screen shots of what the air side loop should look like for a water source heat pump loop. I keep getting error messages related to missing node connections at the wshp.

Zarmbo's avatar Zarmbo  ( 2015-07-21 12:04:04 -0500 )edit

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Asked: 2015-04-15 11:41:11 -0500

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Last updated: Jun 30 '15