Ci. e Nat., Santa Maria v.42, e29, 2020
DOI:10.5902/2179460X41375
ISSN 2179-460X
Received 28/11/20 Accepted: 16/01/20 Published:24/06/20
Environment
Luiz
Bueno da SilvaI
Alinny
Dantas AvelinoII
I Pós-doutor
(PPGEP/UFPE, 2009; PPGEB/UNB, 2018)); doutor em Engenharia de Produção (UFSC, 2001),
mestre em Engenharia de Produção (PPGEP/UFPB, 1996). Professor Titular da UFPB.
- bueno@ct.ufpb.br
II Mestre em
Engenharia de Produção (PPGEP/UFPB, 2017) - avelino.alinny@gmail.com
The homogeneity of the subjects that were studied to produce the PMV
model developed by Fanger and the evolution of the physical environment have an
impact on the usability of the model. Many studies show that the PMV model does
not represent the real thermal sensations of the occupants of the analyzed
building. The purpose of this review is to identify and group the studies that
show some discrepancy between the PMV and the opinions of the subjects
concerning modern climatized field environments in hot climates around the
world. The PRISMA statement was used to recover and analyze the articles, and
23 studies were selected for this review. The majority of the articles
indicated that the PMV model is not suited to evaluate this kind of
environment.
Keywords: Predicted Mean Vote.
Climatized Environment. Hot Climate.
1
INTRODUCTION
The predicted mean vote (PMV) is a mathematical model
developed by Fanger (FANGER; NGER, 1973) to evaluate moderate indoor environments regarding
their thermal comfort. Since its development between 1967 and 1973, there have
been many studies that indicate that the method does not agree with the reality
in a variety of environments (ANDREASI; LAMBERTS; CâNDIDO, 2010; ATTIA; HENSEN,
2014; AULICIEMS; SZOKOLAY, [s.d.]; CHOI; LOFTNESS; AZIZ, 2012; CONCEIÇÃO et
al., 2012; CORGNATI; ANSALDI; FILIPPI, 2009; DE DEAR et al., 2013; DHAKA et
al., 2015; FANGER; TOFTUM, 2002; HUMPHREYS; NICOL, 2002; KIM; MIN; KIM, 2013;
KIM et al., 2015; MAITI, 2014; MOREIRA et al., 2012; RAJA; NICOL, 1996;
RICCIARDI; BURATTI, 2012, 2015; STRAUB; KUCHEN, 2017; TALEGHANI et al., 2013). The reason for this may be that the original
research by Fanger was limited to American college-age students. To verify the
influence of national geographic location he considered a further set of 128
college-age Danish subjects in a climate chamber. This results in a lack of
heterogeneity in the subjects and environment because the summer in Denmark is
colder than the winter in some tropical regions.
The low heterogeneity in the subjects’ characteristics
and the winter climate in Denmark cause the model to deviate from the real
thermal sensations observed in field environments. This deficiency was
identified by Fanger and Toftum (2002) who tried to compensate for this deficiency with an
expectancy factor and a correction index for hot climates.
Over the last few years, the discrepancy has increase
due to the evolution that indoor environments have been going through in hot
climate countries. These environments have been climatized and received smart
equipment, such as computers, that influences the room temperature and has made
it unlikely that the PMV reflects the necessary conditions for thermal comfort (CHOI; LOFTNESS; AZIZ, 2012).
Therefore, this study aims to identify and group the
studies that show some discrepancy between the PMV and the opinion of its
subjects considering smart climatized field environments in hot climate
locations around the world in order to show a consistency in these differences
and identify the reasons identified by the researchers as to why this index
does not reflect the reality of the analyzed environment.
2 MATERIAL AND METHODS
This review was based on the PRISMA statement method
for systematic reviews and meta-analyses. To identify the studies to be
filtered, two online databases were used: Scopus and Web Of Science. They were
chosen because they both have similar filter options and search mechanisms,
and, consequently, it was possible to reproduce the same search in both
databases. The search occurred on January 8th, 2018. The terms used in the
research were identified through a narrative review to obtain the maximum
coverage of articles as in this phase nothing was excluded. The terms of the
search were: “Fanger” OR "thermal comfort" OR “iso7730” OR
"predicted mean vote" OR “PMV” OR "thermal sensation" AND
“NOT outdoor.”
The exclusion criteria in both databases were set to
include only articles or reviews written in English in the engineering or
environmental science area and to exclude studies from before 1963. Articles
from journals are usually peer reviewed and more reliable; therefore, all other
types of documents were excluded. The English language is universal and will
allow the information in this article to be reviewed by peers, which is something
other languages cannot provide. The combination of words used tends to return
results from biology and HRVAC fields that fall under the scope of this
research; therefore, these results had to be excluded by limiting the study
area. The year of 1963 is before the discussion about PMV began since the
7-point scale of opinion was only developed in 1967.
The eligibility criteria were that the study was
conducted in an air-conditioned space in an indoor environment in a hot climate
location. For the studies that did not use the term hot climate, the minimal
temperature to be included was considered 25°C. Studies found in the narrative review
were also considered after removing duplicates.
A quality assessment of the remaining articles was
conducted to keep the papers that contained a methodological comparison between
subjects’ opinions on thermal comfort and a measured, acquired PMV. It was also
considered if sufficient information on the locations and subjects of the study
was given in the methodological section of the paper.
The extraction form was elaborated based on the Data
Extraction Template for Included Studies from the Cochrane Consumers &
Communication Review Group because it consolidates information about
publication quality, the article, subjects of the research and the minimum
information required to answer this review’s research question. The extraction
form was tested and refined using 15 randomly chosen studies.
The information on the extraction sheet was divided
into four groups: (1) Characteristics and general information (including year,
journal, author, title and impact factor), (2) Paper basic information
(including objectives, methodology, existence of a new model, comparison of the
new model and outdoor climate), (3) participant characteristics (including
number of subjects, occupation, geographical location, activity, age and
gender) and (4) minimal information (i.e., if the PMV reflects the temperature
sensation vote (TSV) and the reasons given by the authors as to why it did not
when applicable).
An individual bias analysis was also made in each
study to identify bias, either appointed by the author of the study or noticed
by the reviewers. All information or lack thereof that could change or better
explain the results of the study was considered bias. Additionally, the number
of subjects and conditions of the experiment were considered as they radically
change the research and make it difficult to generalize.
Data were analyzed qualitatively through reading and
extraction of information from each article to identify key aspects of
frequency in them. All the information was organized in the extraction form and
later summarized in a sheet.
3 RESULTS
A total of 27,243 papers were identified through the
database search, and 110 papers were added from the narrative search. Of these,
28,801 studies were excluded because they were in a language other than English
and did not explore the research question from an engineering or environmental
science point of view. Of the remaining articles, 453 studies did not meet the
inclusion criteria as described. After carefully reading the remaining
articles, only 23 of them were used in this review as they answered the
proposed question and provided quality information about the research that led
to its publication. The corresponding flow diagram is in Figure 1.
Figure 1: PRISMA 2009 Flow Diagram
For each study, the characteristics of the
participants evaluated were the number of subjects, occupation, location of the
research (place, country, and continent), activity at the time of the research,
age and gender. Not all the studies showed all the characteristics, but they
were all included when present in Table 1.
Table 1 – Characteristics of the subjects
Occupation |
Number of subjects |
Continent |
Country |
Place |
Activity |
Age (years) |
Gender |
Bankers |
NI |
South America |
Brazil |
Bank |
Sedentary |
NI |
NI |
Welders |
9 |
South America |
Brazil |
metal-mechanic
industry |
Welding |
NI |
NI |
Diverse |
110 |
Asia |
Malaysia |
facility
department |
Sedentary/office/catering |
20-30 |
24.5% male and 75.5%
female |
Non-patient diverse work |
188 |
Asia |
Malaysia |
Malaysia’s
teaching hospitals |
Sedentary/office/catering |
NI |
28.2% male and
71.8% female |
NI |
836 |
Australia |
Australia |
12 office
buildings |
Sedentary/office |
Average: 33.5 |
41.5% male and
58.5% female |
NI |
235 |
Asia |
Singapore |
13 office
buildings |
Sedentary/office |
17 - 60 Mostly between
21-40 |
38.7% male and
61.3% female |
Students |
100 |
Asia |
Malaysia |
lecture halls,
labs and at work stations |
Sedentary |
18 - 28 Average: 23 |
NI |
Students |
2 |
North America |
USA |
Office/home |
Sedentary |
22 and 35 |
100% male |
Prayers |
NI |
Asia |
Malaysia |
Mosque |
Near sedentary |
NI |
100% male |
Office workers |
60 |
Asia |
North Korea |
Office |
Sedentary/office |
NI |
NI |
NI |
18 |
Asia |
South Korea |
NI |
Sedentary |
25.44 ± 2.91 |
NI |
Office workers |
238 |
Europe |
Greece |
Office |
Sedentary |
40% male and 60%
female |
|
Students and staff |
75 |
Asia |
India |
Electronics
Laboratory |
NI |
21.3% under 20; 76% 20-40; 2.7% over 40 |
96% male and 4%
female |
Office workers |
33 |
South America |
Brazil |
Office laboratory |
Sedentary |
20 - 40 |
51.5% male and
48.5% female |
Customers and staff |
1100 |
Europe |
Sweeden |
Supermarket |
Shopping |
Average: 45 |
46% male and 53%
female |
Office workers |
NI |
NI |
Iran |
Commercial and
office building |
Sedentary/Office
work |
37% under 30; 52% 31-50; 11% over 50 |
63% male and 37%
female |
Office workers |
NI |
Europe |
Italy |
Office space |
Sedentary/Office
work |
average: 35 |
NI |
Patient, visitors and medical staff |
928 |
Thailand |
Hospital |
NI |
Patients: 47; visitors: 42 Staff: 31 |
35% male and 65%
female |
|
Textile workers |
823 |
Asia |
China |
Textile company |
NI |
NI |
37.7% male and
62.3% female |
Textile workers and students |
192 |
Asia |
China |
Textile company |
Spinning Workshop |
workers average:
44 students average:
23.5 |
47.4% male and
52.6% female |
Diverse hospital occupation |
114 |
Asia |
Malaysia |
Hospital |
Diverse hospital
activities |
NI |
12.3% male and
87.7% female |
NI |
28 |
Asia |
Malaysia |
National Museum |
NI |
20-28 |
71.4% male and
28.6% female |
NI – Not Identified in the study
All the environments depicted in the studies are
mechanically ventilated through air conditioning. Also, they are all located in
a hot climate considering the minimal external temperature to be included was
considered 25°C.
The studies were also read to determine whether the
PMV matched the TSV and for the cases when they did not match, why they did not
match. This information is summarized in Figure 2.
Figure 2: Does the PMV represent the TSV and why not?
The other items in the extraction table were to
organize and assess the quality of each research. The summary of these data is
available in Table 2.
Biases were identified for each study individually
through reading. The authors of the studies pointed some out, and some were
identified as bias by the reviewers. They were: clothing (Andreasi, Lamberts and Cândido, 2010), date of data collection (Andreasi, Lamberts and Cândido, 2010), definition and differentiation of groups (GILANI; KHAN; ALI, 2016; SATTAYAKORN; ICHINOSE; SASAKI,
2017), number of subjects (HASAN; ALSALEEM; RAFAIE, 2016), lack of characterization of the subjects (HUMPHREYS; NICOL, 2002; HUSSIN et al., 2015), measure points (HUSSIN et al., 2015), unorganized display of results(KOSMOPOULOS et al., 2012) and existing noise on the equipment(KUMAR; SINGH; SUD, 2010).
These results were grouped into two kinds of bias:
technical and communication. The technical biases were clothing, date of data
collection, number of subjects, measure points and existing noise on the
equipment. They represent research choices that may have influenced the results
of the studies. The other biases were considered communication biases that
happen when the authors of the article do not display some of the information
necessary to characterize the article in this review.
Table 2 – Summary of the research data
Year |
Journal |
JCR |
Number |
Title |
Is there a new
model |
Outdoor climate |
Is the new model
more adjusted than the PMV? |
2010 |
Building and
Environment |
4.053 |
(Andreasi, Lamberts and Cândido, 2010) |
Thermal
acceptability assessment in buildings located in hot and humid regions in
Brazil |
No |
Hot |
Does not apply |
2014 |
International Journal
of Industrial Ergonomics |
1.415 |
(BRODAY; XAVIER; DE OLIVEIRA, 2014) |
Comparative
analysis of methods for determining the metabolic rate in order to provide a
balance between man and the environment |
Yes |
Hot |
Yes |
2013 |
Indoor and Built
Environment |
1.181 |
(AZIZPOUR et al., 2013a) |
A Thermal Comfort
Investigation of a Facility Department of a Hospital in Hot-Humid Climate:
Correlation between Objective and Subjective Measurements |
No |
Hot |
Does not apply |
2013 |
Energy and
Buildings |
4.067 |
(AZIZPOUR et al., 2013b) |
Thermal comfort
assessment of large-scale hospitals in tropical climates: A case study of
University Kebangsaan Malaysia Medical Center (UKMMC) |
No |
Hot |
Does not apply |
|
ASHRAE
Transactions: Research |
|
(DE DEAR, RICHARD J; FOUNTAIN, [s.d.]) |
Field experiments
on occupant comfort and office thermal environments in a hot-humid climate |
No |
Hot |
Yes |
1991 |
International
Journal Of Biometeorology |
2.204 |
(DE DEAR, 2004) |
Thermal comfort
in the humid tropics: Field experiments in air conditioned and naturally
ventilated buildings in Singapore |
No |
Hot |
Does not apply |
2016 |
Applied Thermal
Engineering |
3.356 |
(GILANI; KHAN; ALI, 2016) |
Revisiting
Fanger’s thermal comfort model using mean blood pressure as a bio-marker: An
experimental investigation |
Yes |
Hot |
Yes |
2016 |
Building and
Environment |
4.053 |
(HASAN; ALSALEEM; RAFAIE, 2016) |
Sensitivity study
for the PMV thermal comfort model and the use of wearable devices biometric
data for metabolic rate estimation |
Measure through fitbit |
Hot |
Yes |
2002 |
Energy and
Buildings |
4.067 |
(HUMPHREYS; NICOL, 2002) |
The validity of
ISO-PMV for predicting comfort votes in every-day thermal environments |
No |
Does not apply |
|
2015 |
Architectural
Science Review |
- |
(HUSSIN et al., 2015) |
The reliability
of Predicted Mean Vote model predictions in an air-conditioned mosque during
daily prayer times in Malaysia |
No |
Hot |
Does not apply |
2015 |
Energy and
Buildings |
4.067 |
(KIM et al., 2015) |
Development of
the adaptive PMV model for improving prediction performances |
Yes |
Hot and cold |
Yes |
2013 |
International
Journal of Smart Home |
- |
(KIM; MIN; KIM, 2013) |
Is the PMV Index
an Indicator of Human Thermal Comfort Sensation? |
No |
Does not apply |
|
2012 |
International
Journal of Ventilation |
0.391 |
(KOSMOPOULOS et al., 2012) |
An Assessment of
the Overall Comfort Sensation in Workplaces |
Yes (non substitutive model) |
Hot |
Does not apply |
2010 |
International
Journal On Smart Sensing And Intelligent Systems |
- |
(KUMAR; SINGH; SUD, 2010) |
An approach
towards development of PMV based thermal comfort smart sensor |
Yes |
Hot |
No |
2006 |
HVAC and R
Research |
0.928 |
(LEITE; TRIBESS, 2006) |
Analysis of
thermal comfort in an office environment with underfloor air supply in a
tropical climate |
No |
Hot |
Does not apply |
2017 |
International
Journal of Refrigeration |
2.779 |
(LINDBERG et al., 2017) |
Thermal comfort
in the supermarket environment – multiple enquiry methods and simultaneous
measurements of the thermal environment |
No |
Hot and cold |
Does not apply |
2008 |
Indoor and Built
Environment |
1.181 |
(NASROLLAHI; KNIGHT; JONES, 2008) |
Workplace
satisfaction and thermal comfort in air-conditioned office buildings:
Findings from a summer survey and field experiments in Iran |
No |
Hot |
Does not apply |
2012 |
Building and
Environment |
4.053 |
(RICCIARDI; BURATTI, 2012) |
Thermal comfort
in open plan offices in northern Italy: An adaptive approach |
No |
Hot |
Does not apply |
2017 |
Energy and
Buildings |
4.067 |
(SATTAYAKORN; ICHINOSE; SASAKI, 2017) |
Clarifying
thermal comfort of healthcare occupants in tropical region: A case of indoor
environment in Thai hospitals |
No |
Hot |
Does not apply |
2015 |
Mathematical
Problems in Engineering |
0.802 |
(YANG; LIU; ZHOU, 2015) |
Predicted Thermal
Sensation Index for the Hot Environment in the Spinning Workshop |
Yes |
Hot |
Yes |
2015 |
Energy and
Buildings |
4.067 |
(YANG; LIU; REN, 2015) |
Thermal
environment in the cotton textile workshop |
yes |
Hot |
Yes |
2009 |
indoor air |
4.383 |
(YAU; CHEW, 2009) |
Thermal comfort
study of hospital workers in Malaysia |
No |
Hot |
Does not apply |
2013 |
Indoor and Built
Environment |
1.181 |
(YAU; CHEW; SAIFULLAH, 2013) |
A Field Study on
Thermal Comfort of Occupants and Acceptable Neutral Temperature at the
National Museum in Malaysia |
No |
Hot |
Does not apply |
4 DISCUSSION
In 18.18% of the reviewed papers, the PMV was
considered adequate to predict the TSV among the subjects of each research.
Predominantly, the PMV was found to be inadequate. In these cases, it more
frequently overestimates the TSV for hotter votes while underestimating colder
votes in the 7-point scale (HUMPHREYS; NICOL, 2002; KIM et al., 2015; KOSMOPOULOS
et al., 2012; YAU; CHEW; SAIFULLAH, 2013).
Although many reviews have been made to show the
discrepancies between the PMV and the TSV, this one shows that the PMV is also
inaccurate to air-conditioned spaces in a hot climate, going against what’s
stated by Fanger and Toftum (FANGER; TOFTUM, 2002) that the PMV model agrees well in buildings with HVAC
systems, situated warm climates and studied during the summer.
Studies indicate that individuals residing in hot
humid regions have a higher tolerance to high temperatures than those residing
in temperate climates. The comparison of the thermal sensation indicates that
those subjects have significantly higher or wider ranges of thermal comfort for
tropical climates than those obtained in Central and Western Europe. (HIRASHIMA; ASSIS; NIKOLOPOULOU, 2016)
Research in air-conditioned buildings started in 1991 (DEDEAR; LEOW; FOO, 1991), mostly in university environments and offices and
focusing on sedentary work. In university and industrial environments, the
subjects are mostly male, while in hospitals and offices the subjects are
mostly female. The papers do not classify their results based on the subjects’
characteristics such as gender or age.
China has been given attention as an emergent country
in thermal comfort research (DE DEAR et al., 2013), and though investigations conducted in China appear
in the review, Malaysia is the country that has been developing the majority of
the studies in the field.
The main purpose of the articles was not in most cases
to simply evaluate the environment. Of the papers, 31.81% presented a new model
to evaluate thermal comfort in the said environments, and some of them included
a comparison between PMV and the adaptive model, which is also listed as one of
the tendencies of research in this field in the last few years (DE DEAR et al., 2013; DJAMILA, 2017). Of the new models proposed, 85.71% showed better
results than the PMV in the environments to which they were applied.
The reasons appointed to justify the discrepancies
found in the papers from the PMV to the TSV varied between the metabolic rate,
acclimation, air velocity, clothing insulation, chair insulation, lack of
gender differentiation, psycho-physiological reasons, environment temperature,
scale, inconsideration of personal variables and limitations from the
questionnaire.
The majority of the articles presented either metabolic
rate or some criteria associated with it (such as personal variables) as the
reason the opinions disagree with the PMV. A 15% error in the assessment of
metabolic rate can easily lead to errors in the PMV greater than 0.3 depending
on other conditions (HAVENITH et al., 2002), which can explain why the metabolic rate and
associated factors appear as the most frequent bias in the papers reviewed.
As identified by some of the authors (ANDREASI; LAMBERTS; CÂNDIDO, 2010; HUSSIN et al.,
2015) the lack of agreement between TSV and PMV is often
due to sensitivities of the input values (ANDREASI; LAMBERTS; C??NDIDO, 2010; AZIZPOUR et al.,
2013b; BRODAY et al., 2014; GILANI; KHAN; ALI, 2016; HASAN; ALSALEEM; RAFAIE,
2016; HAVENITH et al., 2002; HUSSIN et al., 2015; KIM et al., 2015; KUMAR;
SINGH; SUD, 2010; LINDBERG et al., 2017; YANG; LIU; ZHOU, 2015). The reasons
appointed to justify the discrepancies found in the papers from the PMV to the
TSV varied between the metabolic rate, acclimation, air velocity, clothing
insulation, chair insulation, lack of gender differentiation,
psycho-physiological reasons, environment temperature, scale, inconsideration
of personal variables and limitations from the questionnaire.
The main appointed reason for the discrepancy was the
metabolic rate or activity levels (BRODAY; XAVIER; DE OLIVEIRA, 2014; GILANI; KHAN; ALI,
2016; HASAN; ALSALEEM; RAFAIE, 2016; KIM et al., 2015; KUMAR; SINGH; SUD, 2010;
LINDBERG et al., 2017). Therefore, it is possible to infer that unrealistic
values for the metabolic rate can be the reason of
overestimation/underestimation of the experienced thermal sensation. This can
result in systematic errors which have just recently begun to be highlighted in
the literature.
The papers do not disclosures enough of the
questionnaires used in each of the studies to evaluate their elaboration, but
one(RICCIARDI; BURATTI, 2012) of the 23 identifies the questionnaire as a possible
reason to the inadequacy of the PMV to the studied environment.
The main limitation of this review is that the
diagnosis of the reason as to why the PMV was inadequate for the environments
was given by the author of each study, and therefore, each author limits what
is adequate and what is inadequate.
The models presented in the studies that show a new
model cannot be generalized as they were produced in a specific environment and
can only be applied to that environment.
5 CONCLUSION
The data collected and analyzed through this review
show that the PMV is not generally adequate to express people’s sensation
considering just smart climatized field environments in hot climate locations.
The studies selected included a variety of environments of the selected type
showing that this issue is not concentrated to a specific kind of environment
or related to a specific activity. It is obvious that the evolution in this
field is steady, and people are constantly looking for models that best suit
the environment researched.
As expected, the number of articles that fitted the
research eligibility and exclusion criteria was very limited due to the
bottleneck imposed by the searched criteria. As already known at the beginning
of Fanger research activity, PMV model cannot be generalized in all conditions
and cannot be applied to this specific type of environment.
In practical terms, the use of this model may cause
excessive use of energy due to miscalculations of comfortable temperatures.
Theoretically, it shows a gap that needs to be filled with models that consider
the reasons discussed in this article as to why the PMV is not adequate for
said environments. Findings from field
surveys like the ones presented in this paper are a step forward to improve the
applicability of the PMV model.
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