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[EnergyPlus_Support] Re: Why the generators stop working when selected "Follow Thermal"

Hello Brent,

Thank you very much for your reply! I really appreciate it! I have tried the MicroCoGeneration.idf already, and I got some problem. As I asked in message # 17081. I reproduce the question and paste here:
Thanks a lot again!

Hello,
I have tried the MicroCoGeneration.idf file. The MicroCHP unit is currently providing around 50% of the total heating load (generator operation scheme: follow thermal), but I want the MicroCHP unit provide 100% heating load. Because the Generator:MicroCHP is not normalized, I can not simply increase its capacity from currently 5kW to 10kW, so I added another MicroCHP unit working parallel with the first one. But the simulation result is: the total thermal output of
the two MicroCHP units is still 50% of the total heating load, both of them are working, but both of their thermal and electric output reduced to 50% rated output, My question is: How can the two MicroCHP units working parallel at their rated output to meet the thermal load?

Thank you very much! I am looking forward to discussing with you.
Best,
Peng


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent" <brent.griffith@...> wrote:
>
> Switching to FollowThermal requires also moving the CHP unit from the demand side to the supply side of the plant loop.  You can't just make a change in ElectricLoadCenter:Distribution, you need to rearrange the plant loop as well.  You might want to look at the example file called MicroCogeneration.idf.
> 
> 
> ________________________________
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of pzhaocsm
> Sent: Wednesday, June 09, 2010 10:05 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Why the generators stop working when selected "Follow Thermal"
> 
> 
> 
> Hello,
> I have tried the HeatRecoveryPlantLoop.idf for CHP application.
> I selected "follow thermal" of "Generator Operation Scheme Type" in "ElectricLoadCenter:Distribution" object. When the "follow thermal" option is selected, the three generators all stopped working and of course no thermal energy output. But I found the output of "HOT WATER LOOP:Plant Loop Unmet Demand" was zero, so the thermal demand must be met by the water heater on the heating loop.
> Then I checked the "Big Water Heater" of "WaterHeater:Mixed", which is on the heat recovery loop (and also on the supply side of heating loop) and supposed to collect the hot water from generators for heating coils. I found the "Big Water Heater" is running on electricity with maximum "200000 W", I turned it to be "0", because I want the heating demand met by recovered hot water from generators.
> But the simulation result is: The generators are still not working (no electricity output, not thermal output), the output of "HOT WATER LOOP:Plant Loop Unmet Demand" to be very high, so all of the heating demand was not met, and room temperature goes down to be -1 or -2 in the winter. So the thermal output (now is zero) of generators are not following the demand.
> How does this happen? How can I make the generators working on following the thermal load? How can I use the recovered hot water for heating instead of electric water heaters?
> 
> Thanks a lot!
> Peng
>




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