ASHRAE Journal - August 2023 - 56
HONORABLE MENTION 2023 ASHRAE TECHNOLOGY AWARDS
sweep air across the pool surface to remove harsh chemicals.
As a result, removing chlorine byproducts (hydrochloric
acid, ammonia, etc.) reduces the chlorine smell
and eye irritation and helps ease occupants' breathing.
Innovation
The geothermal heating and cooling system with the
DOAS and the stand-alone pool conditioning provide
flexibility. DCV and appropriate heat pump zoning
allow airflow and load shifting as occupancy changes
throughout the building. Based on historical data and
calculated block load, the wellfield is sized at 705 ft2/ton
(19 m2/kW), eliminating 45 wells, compared to a typical
average size of 400 ft2/ton (11 m2/kW).
The wellfield was installed in summer and data trends
showed remarkably low loop temperatures following a
full cooling season. In August 2022, after a year of operation
and following a hot summer season, the wellfield
temperatures entering and leaving the building were
measured to be 65.2°F and 69.2°F (18.4°C and 20.7°C),
respectively. Expected wellfield temperatures entering
CASE STUDY
and leaving the building would be 85°F and 95°F (29°C
and 35°C), respectively. These temperatures indicate the
wellfield can take more heat rejection from the building.
The test bore drilled before the wellfield installation
revealed a high-water table on-site and indicated good
groundwater movement, which is suspected to be the
reason for excellent heat dissipation from the wells to
the ground. This site knowledge, paired with monitoring
data trends, enables us to capitalize on an even higher
square foot per ton wellfield to serve MHP's new pharmacy
being built on the same campus.
The pool operation trend data is being monitored to
understand the amount of heat rejection produced. Data
shows that the heat rejection from the pool space is not
being rejected to the atmosphere via the fluid cooler but
is being used to warm the pool. The pool heat was not
rejected to the wellfield in this design, but with the new
information learned from the trend data, we would confidently
put a similarly designed pool on the wellfield
and use a water-to-water heat exchanger in lieu of a gasfired
pool boiler to heat the pool water.
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ashrae.org/elearning
or contact elearning@ashrae.org
56
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ASHRAE Journal - August 2023
Table of Contents for the Digital Edition of ASHRAE Journal - August 2023
ASHRAE Journal - August 2023 - Intro
ASHRAE Journal - August 2023 - Cover1
ASHRAE Journal - August 2023 - Cover2
ASHRAE Journal - August 2023 - 1
ASHRAE Journal - August 2023 - 2
ASHRAE Journal - August 2023 - 3
ASHRAE Journal - August 2023 - 4
ASHRAE Journal - August 2023 - 5
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ASHRAE Journal - August 2023 - Cover3
ASHRAE Journal - August 2023 - Cover4
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