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Air Cooled Heat Pumps to Provide Chilled and Hot Water

asked 2019-12-06 09:08:11 -0500

jzaidi's avatar

updated 2020-01-07 17:20:49 -0500

I am working on a building which has radiant floor cooling and heating provided by chilled/hot water generated by air-to-water heat pumps. The building is located in New York City. The building will have heating in perimeter areas and cooling in core areas during winter. It will have simultaneous heating and cooling during winter. The heating efficiency of the heat pumps is affected by outdoor temperatures in winter. I want to use air cooled heat pump. I tried using WaterHeaterHeatPumpStratifiedtank.idf example and modified it to incorporate radiant floor and also added air cooled chiller for cooling. The water heater has a water heater tank and a DX coil. The water heater tank has two electric heaters and all the heating load is taken by these heaters and no heating load is passed to the DX coil. If I reduce the size of the electric heaters, the heating load disappears. Many thanks for any help I can get for simulation of this problem.

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Which software are you using?

Luis Lara's avatar Luis Lara  ( 2019-12-23 09:34:07 -0500 )edit

2 Answers

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answered 2019-12-23 02:22:52 -0500

Marco Furlani's avatar

Usually i delete WaterHeater:Sizing and adjust Indirect Water Heating Recovery Time that is referenced to the DX coil. I'm not sure it work at the same for WaterHeater:Stratified, because i usually use WaterHeater:Mixed with WaterHeater:HeatPump:PumpedCondenser.

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answered 2019-12-20 10:03:49 -0500

Did you solve this problem? I'm working on a similar problem. I did notice that the heating load disappears and the water systems load greatly increases. I would assume because the system is considered a domestic hot water heater, not a hot water boiler. At any rate, it does seem like the electric heaters are taking all of the load and the DX isn't doing anything. I have the HPWH set point set to 110°F and the compressor set to 120°F.

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Asked: 2019-12-06 09:08:11 -0500

Seen: 404 times

Last updated: Dec 23 '19