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Re: [EnergyPlus_Support] Heat pump: external air – water loop



How would you ensure that both heating and cooling is occurring at the same time? 
In this (One Chiller-or-heatpump) system configuration, when building is demanding both  cooling and heating, cooling should be prioritised and heating load is fulfilled by electric reheat coils.

2012/12/18 Karen Walkerman <kwalkerman@xxxxxxxxx>
 

On the heating side you would use a Coil:WaterHeating:AirToWaterHeatPump.

On the cooling side you would use an air-cooled chiller.

--
Karen

On Tue, Dec 18, 2012 at 12:42 PM, Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx> wrote:
 
I am not sure if this is the correct approach- but what I did was model a chiller and boiler with a AHU then a packaged heat pump in the zone. My thought was that the pre-heat/cooled air from the AHU would supply the air source heat pump in the zone to mimic the actual system. Where my work around is questionable is the efficiency between the AHU and the ASHP.. Possibly there is a better solution but I wanted to keep the project in DB so this was the best option I could come up with.. Possibly you could do the same..

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Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951
  






On Tue, Dec 18, 2012 at 9:25 AM, FrancescoP <direzionecontraria@xxxxxxxx> wrote:
 

I have to model a heat pump that outside the building exchanges heat with the external air and it exchanges heat with the building, i.e. with the internal part of the HVAC plant, thorough water. The scheme of the plant is like as follows: www.taec.co.uk/Airpumps
The heat pump works both in heating mode (winter season) and in cooling mode (summer season).
In cooling mode I could model such a system as a chiller. But how could I model it in heating mode?
Could I find an example file in the folder ExampleFiles? I found examples, like 5ZoneWaterLoopHeatPump.idf, in which heat is transmitted through air loops but in my case there is no air loop.
Best Regards






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