ASHRAE Journal - August 2019 - 43
SOLVING PROBLEMS
Solar cooling is more prevalent in Europe for a few reasons. While some Europeans countries do not require
a lot of air conditioning, the European market is more
green energy conscious, according to Merrigan.
Solar photovoltaic systems are already widely adopted
and will continue to grow in use. Morner, who is vice
president at HGA Inc., said he does not know if solar
cooling's current challenges will continue. The future
depends on economics and thermal performance. He
said mass production of solar cooling could help, and
economics will always vary based on solar resources and
energy prices.
The simplest solar cooling systems make electricity and
then run traditional cooling equipment. While there are
more options for these types of systems, Morner said,
climate and the applications available are concerns.
Another solar cooling method that can be cost effective
right now, depending on application and climate, is a
solar drying process that regenerates a dehumidification
wheel, he said.
Morner said solar cooling was being considered for
a project he was involved in a few years ago. The proposed system would use solar thermal energy to run
absorption coolers and chillers. The adsorption coolers
need relatively high temperature sources to achieve
higher efficiency, but it is the opposite with solar collectors where they get less efficient depending on temperatures. Morner said some absorption chiller type
of cycles are not made for solar applications, so they
might need higher temperatures. Equipment for lower
temperatures are currently prototypes and not widely
available.
"That might be a barrier for solar cooling," Morner
said, adding that another barrier is a lot of engineers do
not even consider solar cooling as a possible strategy.
System Options
There are different avenues to use solar cooling.
Options include solar thermal-based absorption,
adsorption, desiccant "solar cooling" systems, desiccant
dehumidification systems and solar electric-based "solar
air conditioning" systems that use PV modules to supply
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ASHRAE Journal - August 2019
Table of Contents for the Digital Edition of ASHRAE Journal - August 2019
Contents
ASHRAE Journal - August 2019 - Intro
ASHRAE Journal - August 2019 - Cover1
ASHRAE Journal - August 2019 - Cover2
ASHRAE Journal - August 2019 - 1
ASHRAE Journal - August 2019 - Contents
ASHRAE Journal - August 2019 - 3
ASHRAE Journal - August 2019 - 4
ASHRAE Journal - August 2019 - 5
ASHRAE Journal - August 2019 - 6
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ASHRAE Journal - August 2019 - Cover3
ASHRAE Journal - August 2019 - Cover4
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