ASHRAE Journal - September 2019 - 11

LETTERS

of fuel options, especially because
oil and natural gas are becoming
more expensive in developing countries, increasing costs of operating
such plants substantially. Biomass
options should be highlighted, as
in Pakistan and other agro-based
economies a large number of highpressure steam boilers are fired by
biomass (mostly bagasse, sugarcane
waste) in combined heat and power
mode, providing both economical
process steam and electrical energy,
some even exporting to the national
grid and making good money.
2. Solar Option. There is a big
opportunity for concentrated solar
power (CSP)-based thermal energy
to supplement boiler feed water
heating, which could considerably
reduce boiler fuel costs. I am not
aware of any industrial or large commercial installation of this option,
but technically this is feasible if roof
or open space allows this.
Mr. Copeland's comments could
clear the above options for possible
implementation.
Ainul Abedin, P.E., Fellow ASHRAE, Karachi, Pakistan

The Author Responds
Comments as follows:
1. Biomass is certainly an option as
the primary form of heating for boilers where oil and gas in parts of the
world are becoming more expensive.
2. I'm not familiar with concentrated solar power (CSP) to produce
heat; usually solar panels these days
produce electricity. In the 1970s we
worked on an early thermal solar
collector on New York's lower east
side to heat domestic hot water. The
building later installed a windmill
on the roof, which produced electricity, exporting some of it to the grid.
When the local utility objected, the

former attorney general Ramsey
Clark defended it with the Public
Service Commission, which gave
rise to the Public Utilities Regulation
Policies Act, which recently celebrated its 40th anniversary. This
permits the export of electricity from
localized generation such as cogeneration along with proper safeguards
to be exported into the grid.

Charles C Copeland, P.E.,
Fellow/Life Member ASHRAE, New York, N.Y.

Desiccant
Dehumidification
Process for Energy
Efficient AC

The August 2019 article "Desiccant
Dehumidification Process For
Energy Efficient Air Conditioning"
details a first-generation device
consisting of a desiccant belt, aimed
at reducing energy consumption
for HVAC. Though the article is
well-written and well-presented,
it represents a substantial "step
backward" in desiccant technology,
using a methodology of a poorly
sealed desiccant laden belt, and
insufficient desiccant mass for the
application.
In comparison, multiple manufacturers use a similar, though patented and proven, approach in this
very same application-minimizing
HVAC energy consumption using
desiccant technology. I am baffled
as to why ASHRAE Journal would
publish an article on an unproven,
"step backward," single example of
a technology which is already sold
commercially and is already saving
energy cost in use.
I request that ASHRAE Journal clarify
for its readers that the method

presented in the article is a single
example experimental device, and
that there are multiple equipment
offerings incorporating desiccant
technology that are currently used to
reduce HVAC energy consumption.
Spencer Goland, Baton Rouge, La.

The Authors Respond
Thank you to Mr. Goland for the
interest taken in our article. We fully
acknowledge that desiccant is widely
used and effective in commercially
packaged and well-proven desiccant systems, such as the desiccant
wheel discussed in the article. The
belt design from our article is absolutely a first-generation experimental model. That being said, we saw
design benefits in the belt that are
not present in other commercially
available desiccant technologies,
including the use of low-cost silica
beads and operation at low regeneration temperatures.
Our article illustrated a limited
example including application
of a relatively small system (i.e.,
not much desiccant) to a building
with low outdoor airflow located
in a climate with comparatively
low humidity, and yet potential for
energy savings was still observed.
Using a commercial product with
optimized design and size, being
in high humidity climate, and/or
requiring a higher amount of outdoor air would greatly increase the
potential of the desiccant technology
for energy saving. We recommend
that anyone interested in reducing
system latent loads contact a local
commercial HVAC supplier or representative to see all the options and
have them assist in the selection.

Tom B. Cremonte, Associate Member ASHRAE, Troy, Mich.,
and Jonathan Maisonneuve, Ph.D.,
Auburn Hills, Mich.

S E P T E M B E R 2 0 19

ashrae.org

ASHRAE JOURNAL

11


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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
ASHRAE Journal - September 2019 - 22
ASHRAE Journal - September 2019 - 23
ASHRAE Journal - September 2019 - 24
ASHRAE Journal - September 2019 - 25
ASHRAE Journal - September 2019 - 26
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
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ASHRAE Journal - September 2019 - Cover3
ASHRAE Journal - September 2019 - Cover4
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