ASHRAE Journal - November 2019 - 55

TECHNICAL FEATURE

Computational Fluid Dynamics

Simulation of Radiant
Cooling Systems in
Cleanroom Applications
BY MOHAMED AL BELTAGY, PH.D., P.E.; MOHAMED EL MORSI, PH.D.; AHMED EL BAZ, PH.D., AHMED EL ASSY, PH.D.

Radiant cooling systems rely on chilled-water pipes to distribute cooling throughout a building rather than a conventional system that uses chilled air and ductwork.
Radiant cooling systems rely mainly on the direct cooling of occupants by the radiation heat transfer because the pipes, which commonly run through ceilings or walls,
maintain surface temperatures of about 18°C (64.4°F). In a radiant cooling system,
ventilation and thermal space conditioning tasks are separated. Forced air is used to
fulfill ventilation requirements and radiant cooling panels are used to provide most of
the cooling.
There are at least three systems of delivering chilled
water in radiant cooling systems. The first and most
common system, the suspended ceiling panel system,
consists mainly of aluminum panels that carry tubing
that can be surface mounted or embedded on floors,
walls, or ceilings. In the second system, the capillary
tube system, cooling grids made of capillary tubes are
placed close to each other. The grids can be embedded
in plaster, gypsum board, or mounted on ceiling panels.
In the third system, the concrete core system, water is
circulated through plastic tubes embedded in the core
of a concrete ceiling. This layout allows the system to
take advantage of the storage capacity of the concrete.

Radiant cooling has difficultly providing dehumidification as the condensation on radiant surfaces may
create indoor rain. Thus, it is limited to spaces with relatively low latent loads. To overcome the condensation
issue, a radiant cooling device with a drip pan is used or
a separate air system is employed to bring in outdoor air
and remove humidity.
The goal of this research is to study the dynamic and
thermal distribution resulting from using radiant cooling techniques inside a simulated cleanroom using the
commercial computational fluid dynamics (CFD) code.
The steps conducted to achieve this goal are as follows:
1. Investigate the performance of the CFD software by

Mohamed Al Beltagy, Ph.D., P.E. is the chairman of Consolidated Consultants and the head of the Mechanical Department at Howeedy Consultant, Cairo. Ahmed El Baz, Ph.D.,
and Ahmed El Assy, Ph.D., are professors in the Mechanical Power Engineering Department at Ain Shams University, Cairo. Mohamed El Morsi is an associate professor in the
Department of Mechanical Engineering in the School of Sciences and Engineering at The American University in Cairo.
N O V E M B E R 2 0 19

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ASHRAE Journal - November 2019

Table of Contents for the Digital Edition of ASHRAE Journal - November 2019

Contents
ASHRAE Journal - November 2019 - Intro
ASHRAE Journal - November 2019 - Cover1
ASHRAE Journal - November 2019 - Cover2
ASHRAE Journal - November 2019 - 1
ASHRAE Journal - November 2019 - Contents
ASHRAE Journal - November 2019 - 3
ASHRAE Journal - November 2019 - 4
ASHRAE Journal - November 2019 - 5
ASHRAE Journal - November 2019 - 6
ASHRAE Journal - November 2019 - 7
ASHRAE Journal - November 2019 - 8
ASHRAE Journal - November 2019 - 9
ASHRAE Journal - November 2019 - 10
ASHRAE Journal - November 2019 - 11
ASHRAE Journal - November 2019 - 12
ASHRAE Journal - November 2019 - 13
ASHRAE Journal - November 2019 - 14
ASHRAE Journal - November 2019 - 15
ASHRAE Journal - November 2019 - 16
ASHRAE Journal - November 2019 - 17
ASHRAE Journal - November 2019 - 18
ASHRAE Journal - November 2019 - 19
ASHRAE Journal - November 2019 - 20
ASHRAE Journal - November 2019 - 21
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ASHRAE Journal - November 2019 - 37
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ASHRAE Journal - November 2019 - Cover3
ASHRAE Journal - November 2019 - Cover4
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