ASHRAE Journal - July 2020 - 64

IEQ APPLICATIONS
COLUMN

Jerzy Sowa

Creation of the Indoor
Environment in Office
Buildings
BY JERZY SOWA, PH.D.

Almost all inhabitants of developed countries spend the majority of their time in
buildings. Therefore, high expectations regarding the environment of the rooms
they occupy should not surprise anyone. These expectations are addressed basically
by architects and HVAC engineers. Surprisingly, more or less consciously, they try to
reproduce the microclimate of the African savanna.
The conventional approach assumes that user satisfaction with the indoor environment is a result of an
excellent architectural design and well-coordinated
engineering and construction efforts. The less positive
view is that the construction of buildings is a process
to create an artificial environment for human life and
work. Ideally, interdisciplinary groups of specialists discuss the desired properties of such interiors in advance
because the indoor environment is full of interdependencies. Physiologists, social psychologists, sociologists and environmentalists can supplement technical knowledge and contribute to high levels of users'
satisfaction.
Anthropologists and researchers analyzing the mitochondrial DNA of modern humans and our ancestors
believe that the roots of humanity lay in the subtropical climate of Africa.1 The development of intellect and
inventions, such as using fire, clothing and construction of shelters, enabled people to migrate to areas with
more severe climates. People appeared in America and
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northern Europe only around 10 to 40 thousand years
ago. Because it is too short a time for fundamental
genetic changes, it is quite evident that minimal stress
to human physiology occurs in an environment of the
African mosaic of forest and savanna2 (Figure 1).

Thermal Comfort
The climate of the African savanna is quite stable
(Figure 2). In Dodoma, Tanzania, the average monthly
air temperatures throughout the year are almost constant, between 20.7°C and 25.4°C (69.3°F to 77.7°F), and
the extreme values are within a quite narrow range of
14.5°C to 31.6°C (58.1°F to 88.9°F). Nowadays, people
live permanently in regions with a much wider span
of air temperatures. Official weather stations measured the lowest temperatures, below −70°C (−94°F)
in Yakutia, Russia, and the highest temperature of
55°C (131°F) in Kebili, Tunisia. Nevertheless, probably
Jerzy Sowa, Ph.D., is an assistant professor at Warsaw University of Technology, Faculty of
Building Services, Hydro and Environmental Engineering, Warsaw, Poland.



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ASHRAE Journal - July 2020

Table of Contents for the Digital Edition of ASHRAE Journal - July 2020

Contents
ASHRAE Journal - July 2020 - Intro
ASHRAE Journal - July 2020 - Cover1
ASHRAE Journal - July 2020 - Cover2
ASHRAE Journal - July 2020 - 1
ASHRAE Journal - July 2020 - Contents
ASHRAE Journal - July 2020 - 3
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ASHRAE Journal - July 2020 - Cover3
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