2.6.2.2
Heat Pipe
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NOTE: The designer will research local conditions
to determine the effect of corrosive atmosphere on
dissimilar metals. Where condenser or evaporator
coils are to be installed in corrosive atmospheres,
the specification for coils and fins will be
rewritten for these specific conditions.
Consideration should be given to the following coil
and fin combinations based on past experience with
the suitability of these materials in dealing with
the local conditions.
a.
Copper coil and aluminum fins, coated.
b.
Copper coil and copper fins, coated.
c.
Aluminum coil and aluminum fins, coated.
d.
Aluminum coil and aluminum fins, uncoated.
e.
Copper coil and copper fins, uncoated.
Coating may be either phenolic or vinyl. For coils
with relatively close fin spacing such as those
found in most unitary equipment, the phenolic
coating is preferred. Phenolic has less tendency to
bridge across the fins than vinyl, has better
thermal conductivity than vinyl and in many
conditions weathers better than vinyl.
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Heat pipe coils shall be of the extended-surface fin-and-tube type and
shall be constructed of seamless [copper] [or] [aluminum] tubes with
compatible [copper] [or] [aluminum] fins. On heat pipes with all aluminum
construction, tubes shall conform to ASTM B 210M ASTM B 210, alloy 1100 and
aluminum alloy conforming to chemical requirements of ASTM B 209M ASTM B 209;
alloy 7072 shall be used for the fins and end sheets. Fins shall be
soldered or mechanically bonded to the tubes and installed in a metal
casing. Coils shall be tested after assembly at pressure specified in
ASHRAE 15 for the refrigerant employed in the system. [After testing of
the heat pipe coils, coils shall be dried to remove free moisture, and
capped to prevent entrance of foreign matter.]
2.6.2.3
Refrigerants
Refrigerants shall be one of the hydrocholrofluorocarbon or
hydrofluorocarbon gases. Refrigerants shall have number designations and
safety classifications in accordance with ASHRAE 34. Refrigerants shall
meet the requirements of ARI 700 as a minimum. Refrigerants shall have an
Ozone Depletion Potential (ODP) of less than or equal to 0.05 and shall be
in compliance with pertinent EPA regulations. The unit shall be factory
leak tested and dehydrated, as specified in Section [15181 CHILLED,
CHILLED-HOT, AND CONDENSER WATER PIPING SYSTEMS] [15182 REFRIGERANT PIPING]
[[_____]].
SECTION 15500A
Page 14
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