I can only guess how you might have
changed the MicroCoGeneration file, but perhaps the fuel cell is picking up the
other half the thermal load.
From:
EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of pzhaocsm
Sent: Thursday, June 10, 2010
10:53 AM
To:
EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [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,
"
>
> 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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