06-06
perimeter insulation on the interior of foundation
walls. The requirements are listed below in Table 6.3.
Table 6 - 3 Perimeter Insulation
Degrees-Days
Insulation Thickness
3000 & Below
25 mm (1")
3001 & Above
50 mm (2")
The insulation shall have "R" value (Same Units as "U")
of 5.0.
B. EXISTING CONSTRUCTION: The designer shall examine the existing
building envelope and recommend the ways and means to improve its
thermal efficiency. It is recognized that retrofitting the existing
walls with new insulation is expensive; however, it should be
evaluated if economically and technically feasible. The existing
single pane windows shall, however, be replaced by insulating double
pane windows ("U" factor 0.5 & Shading Coefficient 0.5) as a part of
the major renovation effort involving heating, mechanical cooling,
and winter humidification.
6.3 DESIGN FEATURES
In addition to energy studies and decisions made in conjunction with
economic analysis, the following features shall be incorporated
without the need for an economic analysis.
A. Air conditioning systems shall be designed to operate below 9 C (48
F) outdoor temperature without refrigeration, unless such
refrigeration is used effectively as a heat pump with overall energy
savings.
B. For all locations where the outdoor winter design temperatures are
below -1 C (30 F) and the winter degree days are in excess of 3000,
heat recovery devices, comprising of either air to air plate heat
exchangers or glycol run around loop heat recovery coils, shall be
installed in all 100% outdoor air systems with capacities in excess
heat is to be extracted, shall also have capacity in excess of 85
operating type. Controls for heat recovery system shall be designed
to avoid defeating any "free cooling" (economizer cycle) operation.
Controls shall also be designed to avoid overheating the outdoor air
during mild or warm weather and prevent icing of the exhaust air coil
below 32 F ambient air temperatures.
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