Hi,
I'm modeling a manufacturing plant. The issues I'm looking for advises are related to modeling the manufacturing process and specifically:
Cooling. There are several molding presses, which are cooled with cold water via their cooling shell (closed loop). The cold water is provided by two air cooled chillers having the total capacity of 128 tons. The chillers are designed to operate with an integrated free cooling package whenever the weather allows it.
The questions are:
1. How could this cooling system be assigned to any of the app. G3.1 table. The building as a whole (area, floors..) belongs to System 5, but I'm not sure how to actually proceed - may be exceptional calculation method?
2. In case the cooling system should be identical for Proposed and Baseline (industrial process), should the free cooling option also to be applied to the Baseline model or there should be just an air cooled chiller. The presumption is that the Proposed building is investing more for increasing the energy efficiency.
Thanks.
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
September 10, 2014 - 8:38 am
This cooling is a process load.
1. Table G3.1.1A does not apply. You must model this process identically in the Baseline unless you are trying to claim savings. If you are trying to claim savings then follow the exceptional calculation method.
2. You would need to justify any savings association with the free cooling as an exceptional calculation. A narrative should describe all Baseline and Proposed case assumptions included for this measure as well as the calculation methodology used to determine the projected savings. The narrative and energy savings should be reported separately from the other efficiency measures in Section 1.7 - Table EAp2-7. The Baseline case description should verify that the efficiency measure is not standard practice for a similar newly constructed facility. Baseline justification must be provided by referencing a recently published document (published within five years of the project registration date), utility program that incentivizes the equipment installed, or by documenting systems used to perform the same function in other newly constructed facilities (three facilities built within the past five years of the project registration date). Savings associated with the proposed case measure should also be justified with published or monitored data.
Vassil Vassilev
ManagerTermoservice
13 thumbs up
September 10, 2014 - 9:35 am
Markus, thanks again for your answer.
For this particular project I've not been provided with any data of the manufacturing equipment (molding press), so I can't make any exceptional calculation for it. In one previous project I've been receiving such data and when I've made there the exceptional calculation as explained by you, I've received the reviewr's approval.
But here I'm asking only about the way of organizing the cold water supply.
In principle there are standart cooling options - air cooled chiller or water cooled with a cooling tower. In this case it was selected one of these typical solution, but with one extra - free cooling option.
If I make an exceptional calculation method just for this cooling part by comparing a standart air cooled chiller with an air cooled with free cooling, will this be accepted?
If not, then all process loads will be identical. So , again my question is just for the cooling.
Thanks
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
September 10, 2014 - 9:58 am
If it were me I would tell my client that I cannot complete the model without data on the equipment.
If you try to claim savings for a component of a system but you do not have any real basis for that system I would certainly not accept it. The Baseline must be well defined and in this case you are making a big assumption.
If you make it identical it should be accepted.
Vassil Vassilev
ManagerTermoservice
13 thumbs up
September 10, 2014 - 10:25 am
Thanks for the reply, Markus.
I have the data of the manufacturing equipment, but the client didn't provide data that he has purchased equipment which is different from the standart practice regardless how many time I've mentioned about it. Even quoting my previous project where such approach was approved.
The cooling option was reported to me as a free coise, which are to be made by client's specialists, base on the climate zone analysis. So their final decision was to an air cooled chiller with free cooling pacage.
Modeling everything identical is not a problem, I've been just thinking whether it desrves a trial for cooling exceptional calculation, but as you say that it will not be accepted, then better save time in this issue,
Thanks
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
September 10, 2014 - 1:21 pm
So again if you can define the baseline within an exceptional calculation method you can certainly pursue it. You will need to make the case for a baseline. Perhaps the manufacturer can help you with that instead of the client.