ASHRAE Journal - February 2015 - 28

TECHNICAL FEATURE | Fundamentals at Work

Part One

Radiant Heating and
Cooling Systems
BY KWANG WOO KIM, ARCH.D., MEMBER ASHRAE; BJARNE W. OLESEN, PH.D., FELLOW ASHRAE

The use of radiant heating systems has several thousand years of history.1,2 The early
stage of radiant system application was for heating purposes, where hot air from flue gas
(cooking, fires) was circulated under floors or in walls. After the introduction of plastic
piping water-based radiant heating and cooling with pipes embedded in room surfaces
(floor, wall, and ceiling), the application increased significantly worldwide. Earlier
application of radiant heating systems was mainly for residential buildings because of
its comfort and free use of floor space without any obstruction from installations. For
similar reasons, as well as possible peak load reduction and energy savings, radiant
systems are being widely applied in commercial and industrial buildings.
This two-part article describes basic knowledge of
radiant heating and cooling systems to give a principle
understanding of the design and operation of this
advantageous system including comfort, system load,
heating/cooling capacity, installation and application of
the system with examples.

Embedded Radiant Heating and Cooling System
Embedded radiant systems are used in all types of
buildings. Due to the large surfaces needed for heat
transfer, the systems work with low water temperature for heating and high water temperature for

cooling. The water temperatures are operated at very
close to room temperature, and, depending on the
position of the piping, the system can take advantage of the thermal storage capacity of the building
structure.
Figure 1 shows the available types of embedded
hydronic radiant systems. The embedded radiant systems, except thermally active building systems (TABS),
are usually insulated from the main building structure
(floor, wall and ceiling), and the actual operation mode
(heating/cooling) of the systems depends on the heat
transfer between the water and the space.

Kwang Woo Kim, Arch.D., is a professor of architecture at Seoul National University, Seoul, South Korea, and president of Architectural Institute of Korea. Bjarne W. Olesen, Ph.D., is
director, professor, International Centre for Indoor Environment and Energy, Technical University of Denmark in Lyngby, Denmark, and vice president of ASHRAE.
28

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ASHRAE Journal - February 2015

Table of Contents for the Digital Edition of ASHRAE Journal - February 2015

Contents
ASHRAE Journal - February 2015 - Cover1
ASHRAE Journal - February 2015 - Cover2
ASHRAE Journal - February 2015 - 1
ASHRAE Journal - February 2015 - 2
ASHRAE Journal - February 2015 - Contents
ASHRAE Journal - February 2015 - 4
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ASHRAE Journal - February 2015 - S1
ASHRAE Journal - February 2015 - S2
ASHRAE Journal - February 2015 - S3
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ASHRAE Journal - February 2015 - S5
ASHRAE Journal - February 2015 - S6
ASHRAE Journal - February 2015 - S7
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ASHRAE Journal - February 2015 - Cover3
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