ASHRAE Journal - May 2020 - 32
TECHNICAL FEATURE
Another HVAC Design Parameter to Consider
Stack Pressure-Created
Airflows in Insulation
Envelopes, Part 2:
Passenger Aircraft
BY DOUGLAS S. WALKINSHAW, PH.D., P.ENG., FELLOW/LIFE MEMBER ASHRAE; RAYMOND H. HORSTMAN, P.E., FELLOW ASHRAE
Aircraft design codes do not address stack pressure-driven air circulation through
insulation envelopes. While the moisture problems associated with these flows
(condensation, microbial growth, corrosion, dead weight) are well known, the effect
on ventilation flow due to them is not. The authors' measurements and calculations
indicate that if 25% or more of the cabin conditioned air travels through the insulation envelope (the space between the cabin liner-the cabin walls and ceiling-and the
aircraft skin), up to 11.6% of the cabin conditioned air (half of which is filtered, recirculated air and the other half engine bleed air) effectively bypasses the occupants.
This paper provides the science behind these stack
pressure effects, reviews the limitations of current
measures and details a set of proposed measures that,
if taken together, will offset these stack pressures and
eliminate all their negative consequences.
This article addresses a specific aspect of the design of
passenger aircraft. It proposes small additions/changes
within the interior wall lining and fuselage, which
would reduce condensation, yet provide benefits for the
interior aircraft air for some cabin designs.
This is the second of a two-part series of papers on
the subject of insulated envelope stack pressures.
Part 1,1 which was in the April issue of ASHRAE Journal,
addressed buildings.
When water condenses on the airplane structure in
flight, it freezes and remains there until the airplane
is in an environment warm enough to melt the ice and
allow the water to flow with gravity. Water can also condense on the cold structure in humid environments
for some period after the plane lands. The water can
Douglas S. Walkinshaw, Ph.D., P.Eng., is president, Indoor Air Technologies, Inc., VEFT Aerospace Inc., and ECHO Air Inc, Canada and USA. Raymond H. Horstman, P.E., is an Indoor
Air Technologies affiliate.
32
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ASHRAE Journal - May 2020
Table of Contents for the Digital Edition of ASHRAE Journal - May 2020
Contents
ASHRAE Journal - May 2020 - Intro
ASHRAE Journal - May 2020 - Cover1
ASHRAE Journal - May 2020 - Cover2
ASHRAE Journal - May 2020 - 1
ASHRAE Journal - May 2020 - Contents
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ASHRAE Journal - May 2020 - Cover3
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