Hi all,
Consider the following type of equipment: http://www.advantageengineering.com/portableChillers/index.php
I've observed a few times now small, process chillers used to pull heat from small hydronic loops in laboratory operaitons. Sometimes they're stuck in a corner out of the way, and other times they're on casters, typically with some kind of special plug to pull higher amperage/voltage.
I know I can consider the whole kit as an electric process load, and that's what I've done for situations like this to-date, but to make sure I'm not missing something: Is it possible to actually define a packaged CHILLER + process loop in an eQuest model that rejects heat into an indoor zone?
~Nick
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Nick Caton, P.E., BEMP
Senior Energy Engineer
Regional Energy Engineering Manager
Energy and Sustainability Services
Schneider Electric
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E nicholas.caton at schneider-electric.com
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Lenexa, KS 66219
United States
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Hi Nick,
You could try modeling these portable process chillers as refrigerated casework. There are refrigeration capabilities in eQUEST v3.64 and v3.65 running in DOE-2.2 mode, accessible through Refrigeration tabs at systems and zones. There are options to model auxiliary loads that can be seen as cooling loads in the zone(s) that contain the "casework". See the DOE-2 documentation for REFG-AUX-KW, REFG-ASH-KW and REFG-AUX-FRAC. I don't see an option for an indoor condenser (to model portable chillers with no outside condenser), so you would need to adjust the condenser and performance curve keywords accordingly to keep compressor power independent of ambient temperature.
Regardless of how you account for the process chiller energy, you need to have a good estimate of the process load on the laboratory hydronic loops. My preference would be to adjust the process load and/or load schedule at the space(s) using EQUIPMENT-KW or SOURCE-BTU/HR to account for the refrigeration energy, and use the SPACE:EQUIP-SENSIBLE or SPACE:SOURCE-SENSIBLE to model heat rejected to indoor zones.
Regards,
~Bill
William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer
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