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Energy Efficient HVAC Design for Cold Storage. Michael Huang, LEED AP Energy Engineer UC Davis. What’s an Ultra Low Freezer?. Ultra-low temperature (ULT) freezers reach -86 o F 400,000 units nationwide, 650-1000 at UCD. Why do we care about them?.

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Energy efficient hvac design for cold storage

Energy Efficient HVAC Design for Cold Storage

Michael Huang, LEED AP

Energy Engineer

UC Davis


What s an ultra low freezer
What’s an Ultra Low Freezer?

  • Ultra-low temperature (ULT) freezers reach -86oF

  • 400,000 units nationwide, 650-1000 at UCD


Why do we care about them
Why do we care about them?

  • Very low cost to store priceless samples


If your freezer is operating efficiently
If Your Freezer is Operating Efficiently...

  • Samples are safer

  • Energy is saved


Conventional cooling approach
Conventional Cooling Approach

  • Size plug load in kW, convert to kBtu/hr, convert to tons, then purchase AC unit (or CHW HX) to cool space

X

Q = 1.08 × m × ∆T

heat load

1.08



Ucd primate center
UCD Primate Center

BARD units

~50 ULT Freezers of various size/capacity

No economizer

Wall mounted BARD units







Estimated savings
Estimated Savings

Based off economizer savings & EER rating


Conclusion
Conclusion

  • Hot aisle/cold aisle containment

  • Maintenance, maintenance, maintenance!


Thank you
Thank you

Michael Huang

UC Davis

[email protected]


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