ASHRAE Journal - July 2024 - 8

LETTERS
Condensation With Insulation Thicknesses
I have read the article " How Much Condensation
Occurs With Various Insulation Thicknesses " by Gökhan
Kahraman and Erdem Isik in the April 2024 Issue of
ASHRAE Journal several times and
have questions for the author.
Q1: What was the relative
humidity in each zone?
Q2: What specifi c insulation was
in the wall?
Q3: Most important, what was the
Kahraman and Erdem Isik in the April 2024 Issue of
perm rate (in grain/h·ft2·in.Hg) of
wall components?
I have been involved with
condensation issues since the 1940s,
and I am still working. My father started
out in the insulation business in 1910.
William A. Lotz, P.E.,
thermal insulation. Its main material is polystyrene, and
cell forming, fl ame retardant paint and environmentally
friendly gases are used in its
formation.
friendly gases are used in its
formation.
Q3: What was the perm rate
Q3: What was the perm rate
(in grain/h·ft2·in.Hg) of wall
components?
(in grain/h·ft
components?
The heat conduction coeffi cients
and I am still working. My father started
William A. Lotz, P.E.,
Felellow/Liflow/Life Member ASHRAE
St. Albans, VT
e Member ASHRAE
St. Albans, VT
THE AUTHORS RESPOND
Thank you very much for your valuable questions.
First of all, I would like to point out that it is an honor for
academics like us that someone like you, who has years
of experience in insulation, has read our article. I will
try to answer your questions in points below.
Q: What was the relative humidity in each zone?
For region 1, 65%
For region 2, 79%
For region 3, 75%
For region 4, 78%
Q2: What specifi c insulation was in the wall?
XPS was used as insulation material. XPS thermal
insulation boards are thermoplastic materials with a
homogeneous cell structure, produced and used for
The heat conduction coeffi cients
of the wall components are given
in Table 3 in the article. The heat
resistance of each wall component
was calculated. Since the calculated
resistances were connected in
series, the total resistance was
calculated by adding the thermal
resistances. According to the total
heat transfer formula, the total
heat transfer coeffi cient was
of the wall components are given
in Table 3 in the article. The heat
resistance of each wall component
was calculated. Since the calculated
resistances were connected in
series, the total resistance was
calculated by adding the thermal
resistances. According to the total
calculated for each region and each thermal insulation
calculated for each region and each thermal insulation
thickness by taking the inverse of the total thermal
resistance value according to the multiplication process.
Gökhan Kahraman, Ph.D.
Erdem Isik, Ph.D.
Tunceli, Turkey
ERRATUM
In the article " Advanced Energy Design for Obihiro
Kosei Hospital " published in the March 2024 issue, on
page 56 the term " reduction " should be " emissions " in
the following sentence: " The combined CO2 reduction
of electricity and gas is 0.101 t-CO2/m2, which is lower
than the emission rate of 0.120 t-CO2/m2 in a large-scale
Japanese hospital database. " You can fi nd the corrected
version at technologyportal.ashrae.org and in the
ASHRAE Bookstore.
Doug Reindl and Stet Sanborn
talk about the the transition
from high GWP to ultralow GWP
refrigerants and the A1, A2 and
A3 refrigerants marketplace.
8
ASHRAE JOURNAL ashrae.org J U LY 2 0 2 4
Scan the QR code or visit:
https://tinyurl.com/
Low-GWP-AJP
http://technologyportal.ashrae.org https://tinyurl.com/Low-GWP-AJP http://www.ashrae.org

ASHRAE Journal - July 2024

Table of Contents for the Digital Edition of ASHRAE Journal - July 2024

Contents
ASHRAE Journal - July 2024 - Intro
ASHRAE Journal - July 2024 - CT1
ASHRAE Journal - July 2024 - CT2
ASHRAE Journal - July 2024 - Cover1
ASHRAE Journal - July 2024 - Cover2
ASHRAE Journal - July 2024 - 1
ASHRAE Journal - July 2024 - Contents
ASHRAE Journal - July 2024 - 3
ASHRAE Journal - July 2024 - 4
ASHRAE Journal - July 2024 - 5
ASHRAE Journal - July 2024 - 6
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ASHRAE Journal - July 2024 - Cover3
ASHRAE Journal - July 2024 - Cover4
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