Energy efficient hvac design for cold storage
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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

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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


Hot aisle cold aisle arrangement

Hot Aisle/Cold Aisle Arrangement


Ucd primate center

UCD Primate Center

BARD units

~50 ULT Freezers of various size/capacity

No economizer

Wall mounted BARD units


Heat gradient across room

Heat Gradient Across Room


Engineering model

Engineering Model


Ucd primate center1

UCD Primate Center


Cold aisle

Cold Aisle


Hot aisle

Hot Aisle


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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