Simply connect the boiler pipe to the solar collector example electric heater connections, and you have the complete DHW system.
In the example (and Figure 118) the DHW temperture can be adjusted in two ways. One mixing with the cold water main water as shown ( tap controlled), and the other by limiting the storage tand temperature, which turns off the boiler loop when the desired temperature is reached. The solar collector is isolated and connector using set point managers..
A storage tank is acturally three heat exchangers in one.
The solar collector example file does not show the boiler and the HW loop. There are many examples which show the normal boiler and tanks with both the HW and DWH.
EPlus do not generate efficiency curves. YOu have to get them from the manufacturer or carry out a real test in the laboratory as used by the manufaturer.
I am not sure what you are trying to do.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: direzionecontraria@xxxxxxxx
Date: Thu, 19 Jul 2012 08:51:44 +0000
Subject: [EnergyPlus_Support] Re: connections of the hot water storage tank
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Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
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EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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In the example (and Figure 118) the DHW temperture can be adjusted in two ways. One mixing with the cold water main water as shown ( tap controlled), and the other by limiting the storage tand temperature, which turns off the boiler loop when the desired temperature is reached. The solar collector is isolated and connector using set point managers..
A storage tank is acturally three heat exchangers in one.
The solar collector example file does not show the boiler and the HW loop. There are many examples which show the normal boiler and tanks with both the HW and DWH.
EPlus do not generate efficiency curves. YOu have to get them from the manufacturer or carry out a real test in the laboratory as used by the manufaturer.
I am not sure what you are trying to do.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: direzionecontraria@xxxxxxxx
Date: Thu, 19 Jul 2012 08:51:44 +0000
Subject: [EnergyPlus_Support] Re: connections of the hot water storage tank
A problematic issue is that in the real HVAC plant the hot water does not pass directly from the hot water storage tank to the DHW loop but there is a heat exchanger. The water in the hot water storage tank, whichin the real HVAC plant is connected to the HW loop as well, can be much warmer than the water that is necessary as domestic hot water and the heat exchanger solves that problem. Therefore the real boiler does not produce water at 40°C (which are requested by the DHW loop) but the waterheater of my model does.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "FrancescoP" <direzionecontraria@...> wrote:
>
> I created the HW loop as independent and within the HW loop I defined the boiler as Boiler:HotWater. The DHW loop and the solar collector loop are connected to the same waterheater.
> You can see an image taken from the svg file:
> http://imageshack.us/f/140/loops.jpg/
> I imposed Heater maximum capacity [W] of the waterheater equal to Nominal capacity of the boiler and Heater thermal efficiency of the waterheater equal to Nominal thermal efficiency of the boiler. Unfortunately the waterheater has not got any Efficiency curve. Do you think that it could be an acceptable solution? Otherwise, how could I improve my model?
> Thank you for your attention and for your help!
> Best Regards
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "FrancescoP" <direzionecontraria@> wrote:
> >
> > As you can see in the image http://img607.imageshack.us/img607/5029/hwdhwsolar.jpg
> > I'm modelling a HVAC plant in which a hot water storage tank is connected with a boiler (hot water is produced by the combustion of natural gas), a solar thermal loop, the hot water loop, and the domestic water loop. Therefore the network of inlet and outlet nodes is quite complicated.
> > The "Water Heater Configuration" of EnergyPlus (Figure 65 of input/output Reference) seems much more schematic.
> > Do you have any suggestion for my modelling work, please? Should I work with nodes, splitters, and mixer (e.g. the connection of the hot water storage tank with the HW loop and with the DHW loop could be common and then a splitter could divide the HW loop from the DHW loop)?
> > Best Regards
> >
>
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "FrancescoP" <direzionecontraria@...> wrote:
>
> I created the HW loop as independent and within the HW loop I defined the boiler as Boiler:HotWater. The DHW loop and the solar collector loop are connected to the same waterheater.
> You can see an image taken from the svg file:
> http://imageshack.us/f/140/loops.jpg/
> I imposed Heater maximum capacity [W] of the waterheater equal to Nominal capacity of the boiler and Heater thermal efficiency of the waterheater equal to Nominal thermal efficiency of the boiler. Unfortunately the waterheater has not got any Efficiency curve. Do you think that it could be an acceptable solution? Otherwise, how could I improve my model?
> Thank you for your attention and for your help!
> Best Regards
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "FrancescoP" <direzionecontraria@> wrote:
> >
> > As you can see in the image http://img607.imageshack.us/img607/5029/hwdhwsolar.jpg
> > I'm modelling a HVAC plant in which a hot water storage tank is connected with a boiler (hot water is produced by the combustion of natural gas), a solar thermal loop, the hot water loop, and the domestic water loop. Therefore the network of inlet and outlet nodes is quite complicated.
> > The "Water Heater Configuration" of EnergyPlus (Figure 65 of input/output Reference) seems much more schematic.
> > Do you have any suggestion for my modelling work, please? Should I work with nodes, splitters, and mixer (e.g. the connection of the hot water storage tank with the HW loop and with the DHW loop could be common and then a splitter could divide the HW loop from the DHW loop)?
> > Best Regards
> >
>
__._,_.___
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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