Open Loop Ground Source Heat Pump in E+ - Unmet Hours

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Open Loop Ground Source Heat Pump in E+

asked 3 years ago

njharvey1994
73 ●4

updated 3 years ago

flag of United States of America

4446 ●5 ●17 http://bleedinggreenna...

I am working on modeling an open loop geothermal heat pump in E+ and am having issues with my water temperature. I have read one post about how to model an open loop system by using PlantComponent:TemeratureSource which is what I used for model. I specify a PlantComponent:TemperatureSource with a constant temperature of 47 F (local deep ground water temperature). I have coupled this with setpointmanager:scheduled (which is a schedule of 47 F for all days) and PlantEquipmentOperation:Uncontrolled. When I run my model and look at the CondenserLoopDemandReport:Monthly, the report is indicating a loop supply temperature of -37 C (~ -35 F) which is WAY too low. Any thoughts on why this is happening and how I might be able to fix it?

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attached is a link to my IDF file. https://drive.google.com/file/d/1vpgl...

njharvey1994 ( 3 years ago )

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answered 3 years ago

flag of United States of America

2124 ●42 ●8 http://ericmartinpe.com/

The main issue is using PlantEquipmentOperation:Uncontrolled for your Condenser loop control scheme. If you replace this with PlantEquipmentOperation:HeatingLoad it works as expected.

Also, your IDF is missing the Version object (I guessed 9.3 and it ran fine). And while not entirely necessary, you may consider changing your SetpointManager:FollowGroundTemperature to SetpointManager:Scheduled since you just want to maintain a constant 8.3C supply water setpoint.

I sorted the original and fixed IDFs so you can easily compare the two files to see what changed.

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Asked: 3 years ago

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Last updated: Jun 11 '21

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