ASHRAE Journal - July 2019 - 18
TECHNICAL FEATURE
and the ranges of temperatures
leading to slightly warm, slightly
cool, and neutral thermal sensation. In these figures, the ±0.5 PMV
comfort zone is shown shaded.
Note that the temperatures have
been rounded to 0.5°C (0.9°F) for
simplicity.
As indicated in Figures 5 and 6,
the range of activity levels from
Table 3 leads to a corresponding
range of PMV values from slightly
cool to slightly warm. Essentially, at
higher activity levels, a slightly warm
thermal sensation is expected, while
for lower activity levels, a slightly
cool thermal sensation is expected.
However, the slightly cool sensation
can simply be overcome with the use
of a vest. These results agree with the
TSV results from the field study.
These ranges of temperatures are
not intended to provide thermal
comfort for patients, only for nurses.
The thermal conditions and needs of
patients need to be studied carefully.
These conditions will differ from
those for nurses but may overlap to
some degree.
FIGURE 3 Neutral PMV for the corresponding neutral temperature from the field (basic uniform + chair).
FIGURE 4 Neutral PMV for the corresponding neutral temperature from the field (add uniform vest).
Conclusions
Many health-care settings challenge the design for thermal
comfort for its occupants due to
diversity in the occupants' thermal comfort factors. However,
assessing thermal comfort in health-care settings
requires consideration of multiple contextual factors inherent to each specific medical/support service. Regardless of the complexity, thermal comfort
tools and analyses need to be conducted to examine
design and operation alternatives that would aim
at providing thermally acceptable conditions for
each representative occupant in a thermal zone. The
tools, methods, and metrics provided by Standard
55-2017 can be used for thermal comfort analyses
as long as the standard's conditions and limitations
18
ASHRAE JOURNAL
ashrae.org
J U LY 2 0 19
are met. A patient's conditions and/or treatments
will commonly eliminate or question the applicability of using Standard 55-2017 to establish a patient's
thermal comfort factors. The thermal requirements
of patients need to be carefully analyzed. The thermal
comfort design and operational solutions also need to
support their treatment and conditions. For the other
typical adult occupants, such as nurses, doctors,
medical support staff, and visitors, Standard 55-2017
methods would commonly apply. The case study on
nurses supports its use in one such example.
https://www.ashrae.org/
ASHRAE Journal - July 2019
Table of Contents for the Digital Edition of ASHRAE Journal - July 2019
Contents
ASHRAE Journal - July 2019 - Intro
ASHRAE Journal - July 2019 - Cover1
ASHRAE Journal - July 2019 - Cover2
ASHRAE Journal - July 2019 - 1
ASHRAE Journal - July 2019 - Contents
ASHRAE Journal - July 2019 - 3
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ASHRAE Journal - July 2019 - Cover3
ASHRAE Journal - July 2019 - Cover4
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