ASHRAE Journal - September 2019 - 51

TECHNOLOGY UPDATE

in resiliency: backup cooling during power outages,
supplemental cooling during equipment failures and
supplemental cooling during heat waves and high ambient temperatures.

Strategies
Using backup cooling during power outages is a strategy.
Thermal storage can maintain temperature stability when
the grid ﬂuctuates when coupled with a small generator or electrochemical battery, which powers pumps and
fans. This can save money by preventing food spoilage and
buying enough time to get refrigerated truck or backup
generator on site for longer duration outages, said Lerch.
Thermal storage can provide cooling services if a compressor, condenser or another piece of equipment fails
or underperforms. During heat waves, thermal storage can supplement the cooling capacity, he said. This
redundancy provides a level of resilience.
Another strategy is connecting thermal storage to a
small, on-site generate or a small lithium ion battery to
power case fans. If the power goes out on-site, this can

provide cooling to the cases and the walk-in freezers for
an extended period.
When frozen food experiences temperature changes,
micro-thawing and micro-freezing create larger ice
crystals that degrade cell structure and reduce food
quality and shelf life, Vance said.
Thermal energy storage systems provide a key element
of resiliency for long-term duration power outages and
normal daily business operations, which can also affect
temperature, food quality and product shelf life, said
Vance. He said TES systems use latent heat to absorb
50%-85% of the heat inﬁltration, consolidate the heat
near the top of the room directly in the refrigeration
airﬂow and shift more compressor runtime to nighttime
hours. The result is systems with thermal energy storage
use an average of 25% less energy while improving temperature stability.
"When all of this is understood, engineers and facility
operators can use TES for disaster back-up, temperature
stability during normal daily operations and for broader
energy reduction strategies," Vance said.

Desiccant and Energy Recovery wheels
available in standard and custom sizes.
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ASHRAE Journal - September 2019

Table of Contents for the Digital Edition of ASHRAE Journal - September 2019

Contents
ASHRAE Journal - September 2019 - Intro
ASHRAE Journal - September 2019 - Cover1
ASHRAE Journal - September 2019 - Cover2
ASHRAE Journal - September 2019 - 1
ASHRAE Journal - September 2019 - Contents
ASHRAE Journal - September 2019 - 3
ASHRAE Journal - September 2019 - 4
ASHRAE Journal - September 2019 - 5
ASHRAE Journal - September 2019 - 6
ASHRAE Journal - September 2019 - 7
ASHRAE Journal - September 2019 - 8
ASHRAE Journal - September 2019 - 9
ASHRAE Journal - September 2019 - 10
ASHRAE Journal - September 2019 - 11
ASHRAE Journal - September 2019 - 12
ASHRAE Journal - September 2019 - 13
ASHRAE Journal - September 2019 - 14
ASHRAE Journal - September 2019 - 15
ASHRAE Journal - September 2019 - 16
ASHRAE Journal - September 2019 - 17
ASHRAE Journal - September 2019 - 18
ASHRAE Journal - September 2019 - 19
ASHRAE Journal - September 2019 - 20
ASHRAE Journal - September 2019 - 21
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ASHRAE Journal - September 2019 - 27
ASHRAE Journal - September 2019 - 28
ASHRAE Journal - September 2019 - 29
ASHRAE Journal - September 2019 - 30
ASHRAE Journal - September 2019 - 31
ASHRAE Journal - September 2019 - 32
ASHRAE Journal - September 2019 - 33
ASHRAE Journal - September 2019 - 34
ASHRAE Journal - September 2019 - 35
ASHRAE Journal - September 2019 - 36
ASHRAE Journal - September 2019 - 37
ASHRAE Journal - September 2019 - 38
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ASHRAE Journal - September 2019 - 49
ASHRAE Journal - September 2019 - 50
ASHRAE Journal - September 2019 - 51
ASHRAE Journal - September 2019 - 52
ASHRAE Journal - September 2019 - 53
ASHRAE Journal - September 2019 - 54
ASHRAE Journal - September 2019 - 55
ASHRAE Journal - September 2019 - 56
ASHRAE Journal - September 2019 - 57
ASHRAE Journal - September 2019 - 58
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ASHRAE Journal - September 2019 - 60
ASHRAE Journal - September 2019 - 61
ASHRAE Journal - September 2019 - 62
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ASHRAE Journal - September 2019 - Cover3
ASHRAE Journal - September 2019 - Cover4
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