HVAC
4-3
DOD 4270 1-M, Chapters 8 and 9, establishes minimum
4-3.1 STANDARDS:
a c c e p t a b l e standards for Heating, Ventilating and Air Conditioning (HVAC)
systems
designed
for
new
club
faciIities
and
for
the
rehablitation
of
old
facilities.
Notes relating to preferred HVAC systems in club
f a c i l i t i e s are also included in DA PAM 230-1, C h a p t e r 5 , S e c t i o n s 9 - 1 1 ,
pages 5-6.
4-3.2 OBSOLESCENCE:
Due to physical wear over the service life of
e q u i p m e n t , and to the introduction of higher standards of code and
p e r f o r m a n c e criteria, many HVAC systems in older facilities do not
p r o v i d e an acceptable level of service.
I n the selection of HVAC systems, c o n s i d e r a t i o n should be given to the long
t e r m implications for obsolescence as they affect performance and cost.
4-3.3 SYSTEM EXTENSION:
In planning facilities for future change,
r e c o g n i t i o n of the need for extension of a single HVAC system, or series of
s i m i l a r s y s t e m s , should be made.
For heating this may involve the
p r o v i s i o n of space for the addition of furnaces and air handling units to
c o u p l e with the existing systems, o r for the addition of elements of
sectionalized equipment.
In either event the controls should be mutually
r e s p o n s i v e and complementary.
4-3.4 CONTROL:
Heating and cooling distribution systems should be
d e s i g n e d to respond to varying contributions of heat gain and loss due to
c o n d i t i o n s external to the systems themselves.
Notable causes of
differential temperatures are solar heat gain through the fabric of the
b u i l d i n g , loss due to exposure to prevailing winds, and independent
i n t e r n a l heat sources such as kitchen equipment, open fireplaces, and even
b o d y emissions in areas of dense occupancy.
4-3.5 NOISE AND DRAFTS:
Complaints of excessive noise are generally
attributable to excessive air velocities, poor positioning of air diffusers
a n d return air griIIes relative to the occupants, or to inadequacies in the
a t t a c h m e n t of the insulation of the duct system.
The first two also
c o n t r i b u t e to discomfort due to excessive drafts.
W h i l e occasional compromises must be made in the rehabilitation of
existing
b u i l d i n g s , o b s e r v a n c e of new construction standards defined
by
D O D 4270.1-M should result in no deficiencies in new buildings.
4-3.6 SUB-SYSTEM ALTERNATIVES:
A comprehensive
description of generic
Guide and Data
s y s t e m s for air conditioning can be found in the
Book, Chapter 1.
For the purpose of establishing eligibility and other limitations on design
c r i t e r i a and weather zones, reference should be made to document
DOD 4270.1-M, Table 8-2 and Table 8-3.
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