being more compact, more efficient, easier to clean,
and it is commonly produced from superior materials.
They can also be easily expanded to larger sizes if
necessary, and many require little or no insulation.
The designer should consider use of these
exchangers whenever practical. Because of the wide
variety of configurations used by these heat
exchangers, they must often be sized by the
individual manufacturers. In accordance with TM
5-804-2, the flow rate on the storage side of the
heat exchanger should be 1.25 times that on the
collector side. Items to be shown on the drawings
must include:
a. Type of heat exchanger and heat exchanger
materials
b. Flow rates on both sides of heat exchanger
c. Plate or tube heat transfer area.
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The heat exchanger construction and testing shall be in accordance with
ASME BPVC SEC VIII D1. Minimum design pressure rating shall be 862 kPa 125
psig. Heat exchanger shall be capable of returning a hot-side exit
temperature of [49] [_____] degrees C [120] [_____] degrees F or less given
a hot-side approach temperature of 60 degrees C 140 degrees F and a
cold-side approach temperature of 38 degrees C 100 degrees F. Heat
exchanger shall be capable of withstanding temperatures of at least 116
degrees C 240 degrees F. Heat exchanger shall be capable of operation at
the flow rates as shown.
2.7.1.1
Plate Heat Exchanger
Heat exchanger shall be constructed of multiple plates of 316 stainless
steel, titanium, copper, copper-nickel, or brass. Plates shall be
frame-mounted, mechanically bonded, welded, or brazed at edges. Plate-type
heat exchanger shall be able to be cleaned. Gaskets shall be of EPDM
rubber or Viton. All plate heat exchanger characteristics shall be as
indicated.
2.7.1.2
Tube-in-Shell Heat Exchanger
Heat exchanger shall be [fixed] [removable] bundle, shell-and-tube type.
Shell, tube sheets, and end plates shall be constructed of nonferrous,
brass, copper-nickel, or 316 stainless steel. Shell insulation shall be in
accordance with Section 15080A THERMAL INSULATION FOR MECHANICAL SYSTEMS,
except that insulation shall have a minimum R value of not less than 12.
Tubes shall be seamless copper or copper alloy and shall be mechanically
bonded, welded, or brazed to the end tube plates. Tubes shall be straight
and supported by tube sheets which maintain the tubes in alignment.
[Straight tube heat exchanger shall be arranged for mechanical cleaning.]
All tube-in-shell heat exchanger characteristics shall be as indicated.
2.7.2
Pumps
Circulating pumps shall be electrically-driven, single-stage, centrifugal
type. The pumps shall be supported [on a concrete foundation] [or] [by the
piping on which installed]. The pumps shall have a capacity not less than
that indicated and shall be either integrally-mounted with the motor or
direct-connected by a flexible-shaft coupling on a cast-iron or steel
SECTION 13600A
Page 19
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