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Re: [EnergyPlus_Support] Re: DX:coil:heatpumpwaterheater, Minimum Evaporator Temperature
Yes, we have answered this before. The problem is that if the air
entering the DX cooling coil is less than about 5C, the coil will freeze
up. There is currently no frost control in the heat pump water heater
model. Usually this type of water heater would be protected from the
environment in a mechanical room.
JV Dirkes II wrote:
>
> This sounds failiar. Have you checked previous posts? I think this
> was a topic about 6 months ago.
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>, "aymericnovel"
> <aymericnovel@...> wrote:
> >
> > Hi all,
> >
> > I have been modelling a building with an air to water heat pump as
> > heating plant. I used the object DX:COIL:HEATPUMPWATERHEATER, which is
> > then connected to a WATERHEATER:MIXED (tank) and a FAN:ONOFF.
> >
> > In the principle it works well BUT: The heat pump does not work if the
> > air temperature at the evaporator is less than 5°C!! Is there any way
> > to make it work at less than 5°C so that my heat pump produces heat
> > during the whole winter even if COP is low?
> >
> > If this is not possible, is there another way (other object) to
> > simulate this kind of heat pump?
> >
> > Thanks for your help,
> > Best regards,
> > Aymeric
> >
>
>
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Richard A. Raustad
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