As I have mentioned in this forum before, EPlus does not operate exactly as a real system. It is a simulation.
The diagram in the example file has two tanks.
Tank 1 source side connected to the solar panel. A pump with small head is used to simulate the thermal circulation.
Tank 1 use side is the DHW water supply, it is looped to the secnod tank, (tank 2)
Tank 2 has a electric heater with a small volume to simulate an instaneous tank. This is to simulate immediate transfer of heat to the DHW without having to heat up the tank 2 first.
You may be able to replace this with a gas heater (Propane Boiler), if you specify the tank 2 as a heater tank with a natural gas heater instead of electricity.
The gas heater can in fact be shared.
The third tank is there for isolation of fluid to the radiant panel. It is considered as part of the DHW. When the DHW is hot, the storge tank is charged. The charging stops, when the temerature is low. This is exactly the same way as the solar panel operation.
When the gas heater is on, the temperature of the DHW tank supply is always high, then both DHW and storage tank can be operting at the same time.
I am typing this from memory. It has been sume time when I last looked at the solar panel example. E&OE.
Recently (last year), another user use the cut and paste to use this model to a building system.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: mneves32@xxxxxxxxx
Date: Thu, 5 Apr 2012 14:55:05 +0000
Subject: [EnergyPlus_Support] Re: Solar Collectors - Heating and DHW
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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/
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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The diagram in the example file has two tanks.
Tank 1 source side connected to the solar panel. A pump with small head is used to simulate the thermal circulation.
Tank 1 use side is the DHW water supply, it is looped to the secnod tank, (tank 2)
Tank 2 has a electric heater with a small volume to simulate an instaneous tank. This is to simulate immediate transfer of heat to the DHW without having to heat up the tank 2 first.
You may be able to replace this with a gas heater (Propane Boiler), if you specify the tank 2 as a heater tank with a natural gas heater instead of electricity.
The gas heater can in fact be shared.
The third tank is there for isolation of fluid to the radiant panel. It is considered as part of the DHW. When the DHW is hot, the storge tank is charged. The charging stops, when the temerature is low. This is exactly the same way as the solar panel operation.
When the gas heater is on, the temperature of the DHW tank supply is always high, then both DHW and storage tank can be operting at the same time.
I am typing this from memory. It has been sume time when I last looked at the solar panel example. E&OE.
Recently (last year), another user use the cut and paste to use this model to a building system.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: mneves32@xxxxxxxxx
Date: Thu, 5 Apr 2012 14:55:05 +0000
Subject: [EnergyPlus_Support] Re: Solar Collectors - Heating and DHW
Hello,
Thank You for your time.
The system I want to study is:
- DHW.
.........Main Heating source - Solar Collectors;
.........Auxilary heating System - Propane Boiler.
- Heating System (Radaint Underfloor Heating)
......... Main Heating source - Propane Boiler;
..........During Daytime when DHW is not needed and solar conditions are good - Solar Collectors.
Objectives:
Evaluating the contrubuition of the Solar Collectors, funtion of it´s area for heating and DHW;
Problem In Energy Plus:
How to manage the control of the source side plant energy for the heating and Domestiec Hot Water Systems, considering we have a boiler in the mix.
Thanks
MN
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
>
>
> I mentioned it is capacity problem, because you may not get enough heat in Winter for heating. The surface collector may need to be insulated from OD convection, etc. filled with anti-freeze as well. These are not in the example. Since you will be using three tanks in my suggestion, the radiant system tank is charged when ever possible, when the interfacing tank temperature is right. The water main water should not enter this third tank. Dr. Li
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: mneves32@...
> Date: Thu, 5 Apr 2012 10:06:56 +0000
> Subject: [EnergyPlus_Support] Re: Solar Collectors - Heating and DHW
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> I´ll give it a try.
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> MN
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> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@> wrote:
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> > Solar system into primary tank. draw side of primary split to DHW Tank and Radiant system. setting the radiant system to off when the DHW tank draws heat is possibly tricky, but definately possible with EMS.
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>
Thank You for your time.
The system I want to study is:
- DHW.
.........Main Heating source - Solar Collectors;
.........Auxilary heating System - Propane Boiler.
- Heating System (Radaint Underfloor Heating)
......... Main Heating source - Propane Boiler;
..........During Daytime when DHW is not needed and solar conditions are good - Solar Collectors.
Objectives:
Evaluating the contrubuition of the Solar Collectors, funtion of it´s area for heating and DHW;
Problem In Energy Plus:
How to manage the control of the source side plant energy for the heating and Domestiec Hot Water Systems, considering we have a boiler in the mix.
Thanks
MN
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
>
>
> I mentioned it is capacity problem, because you may not get enough heat in Winter for heating. The surface collector may need to be insulated from OD convection, etc. filled with anti-freeze as well. These are not in the example. Since you will be using three tanks in my suggestion, the radiant system tank is charged when ever possible, when the interfacing tank temperature is right. The water main water should not enter this third tank. Dr. Li
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: mneves32@...
> Date: Thu, 5 Apr 2012 10:06:56 +0000
> Subject: [EnergyPlus_Support] Re: Solar Collectors - Heating and DHW
>
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> Thank´s
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> I´ll give it a try.
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> MN
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> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@> wrote:
>
> >
>
> > Solar system into primary tank. draw side of primary split to DHW Tank and Radiant system. setting the radiant system to off when the DHW tank draws heat is possibly tricky, but definately possible with EMS.
>
> >
>
__._,_.___
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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