Chilled Water Temperature Reset, Does It Save Energy? (BMS)
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- เผยแพร่เมื่อ 29 ส.ค. 2024
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Professor great speaker
Clockworks analytics is a very good tool to monitor a strategy like this in realtime
And it gets worse .......in VAV systems higher air off temps = more not necessary air flow = more fan power !!
BTW I am a big believer in CHW reset ......correctly
Yep..
The actual point here, which you have touched on with your final comment. Is that all these little things that we can do to save energy, do actually save energy (chiller COP increasing), but the SMARTS are not in the control strategy, not the lines or blocks of code, but in the engineers understanding of the impact across all other associated systems.
I honestly reviewed a BMS design this last week that had a chiller supply water temperature reset and the default min and max limits (that the chiller set point was capable of being reset between), was 6°C to 12°C. They were going to allow the chiller set point to reset up to 12°C.
Start with 1°C, maybe 2°C.
Get a feeling for it..
most chilled water system are only supplied in the AHU not through the VAV where a reset can be useful.
It sure takes a holistic approach. But a 800 ton chiller has 500 hp compressor while pump could be a fraction of that. So temp rest should be the hanging fruit in most of cases.
Hi Towing bull, LOL. You are probably right. However, the point is that no BMS company understands the relationship. And if we are going to deploy a chiller temperature reset, then we should understand the addiitonal power from the pumps over the saving of the chiller. I have seen BMS engineers programming a reset that resets from 6°C up to 12°C, that can't be good? Cheers.
Is there any software available for simulating the chiller set reset strategy
Not that I know of. However, the AI/ML cloud companies are getting closer. I am working with a couple of machine learning tech companies that are busy working out how to do this. This will happen soon.
A human could actually do it if they built the right trends and spent some time studying the amount of increased pumping power for each °C raised in chiller supply water temperature. It's just BMS service techs are not taught how to do complex system analysis.
Does anyone know what effective cooling and a effective heating means as in setpoints? I have a occ and unocc setpoint for heat and cool, but not sure what the effective means.
Hi, in my experience.
We have a common set point, 22.5°C.
0.5°C dead band.
Effective cooling set point 23°C
Effective heating set point 22°C
The common set point could shift for occupancy or unoccupancy, and then the effective set points would also shift.
The effective set point is the actual real set point that the PID loop is working to after any off sets, additions and subtractions, dead bands etc.
just use Avasva Solutions :)))