Support structure shall allow access to all equipment for maintenance,
repair, and replacement.
2.6
STORAGE TANK
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NOTE: Storage tank volume should be between 61 to
81 liters per square meter (1.5 to 2 gallons per
square foot) of collector area. This range of
acceptable values should be inserted in the blanks
provided based on the array area inserted in
paragraph Net Absorber Area and Array Layout.
Storage volume outside of this range becomes
undesirable from a system performance point of view.
Items to be shown on the drawings must include:
a. Range of acceptable storage tank volumes
b. Number of liters (gallons) of storage provided
per square meter (square foot) of collector area for
given tank
c. Minimum R value of tank insulation
d. Type of lining in tank.
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Solar system hot water storage tank shall have a storage volume between
[_____] and [_____] liters gallons and shall be as shown. Solar system
storage tank shall conform to specifications for hot water storage tanks in
Section 15400A PLUMBING, GENERAL PURPOSE. Insulation shall be in
accordance with Section 15080A THERMAL INSULATION FOR MECHANICAL SYSTEMS,
except that insulation shall have an R value of not less than 30. Tank
penetrations shall be designed to allow for connections to copper piping
without risk of corrosion due to dissimilar metals, and shall be factory
installed as indicated.
2.7
TRANSPORT SUBSYSTEM
2.7.1
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NOTE: Although solar energy system performance is
not strongly dependent on the effectiveness of the
particular heat exchanger used, it is very important
to ensure that it is sized properly. Use of the
approach and return temperatures stated in this
paragraph ensures that the effectiveness of the heat
exchanger is within acceptable limits. The hot side
return temperature can be less than 49 degrees C
(120 degrees F) if the designer feels that the
effectiveness should be greater than 0.5. When
multiplate heat exchangers are used, the
effectiveness can be significantly increased above
0.5 for a small increase in heat exchanger cost.
Both shell-and-tube and multiplate or
plate-and-frame heat exchangers are allowable for
solar systems. Although the shell-and-tube
exchangers are more common, multiplate heat
exchangers are becoming readily available from a
variety of manufacturers. The multiplate heat
exchanger has the advantages over shell-and-tube of
SECTION 13600A
Page 18
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