06-06
1. All items of the cooling system, that is, chillers, circulating
pumps, cooling tower fans, and associated automatic control
circuits.
2. All heat tracing circuits for chilled water and cooling tower
freeze protection.
6. ENERGY CONSERVATION
6.1 GENERAL
The project design including mechanical systems shall use the
provisions outlined in this document, and criteria from other
technical disciplines, to meet the requirements of the DOE regulations
10-CFR Part 435 Energy Conservation Voluntary Performance Standards
for Commercial and Multi-Family High Rise Residential Buildings;
Mandatory for new Federal Buildings. To demonstrate compliance with
the "DOE Interim Standards", should it become necessary to change any
requirement outlined in the VA HVAC Design Manual, the A/E shall
provide definite recommendations to do so after a careful review of
the Standards and VA Manual.
6.2 BUILDING THERMAL ENVELOPE
A. NEW CONSTRUCTION: The building thermal envelope for the new VA animal
research facilities shall be energy efficient to minimize the heat
gain and loss due to conduction and solar radiation. The building
envelope shall minimize the air leakage to and from the occupied
spaces and shall also ensure condensation control.
1. Recommend "U" Values: The following represents the recommended "U"
values of walls, roof, and glass, and the Shading Coefficients
(SCs) of glass for new construction. These values should be used
to meet the overall Uo factor, for the building gross wall area,
defined under the next paragraph.
Table 6.1
Wall"U"
Glass"U"/SC
Roof"U"
Floor"U"
Degree-Days
3000 & Below
0.27(0.13)
2.3(1.13)/0.6
0.10(.05) 0.24(0.12)
3001 to 5000
0.20(0.10)
1.02(0.5)/0.5
0.10(.05) 0.20(0.10)
5001 & Above
0.14(0.07) 1.02(0.5)/0.33 0.06(.03) 0.16(0.08)
Notes:
1.
The degrees days are based on heating season below 18oC
(65oF) outdoor temperature in accordance with the
ASHRAE Handbooks of Fundamental and Systems.
2.
The SCs of the glass windows are based on the intrinsic
property of the glass material only, that is, without
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