06-06
2.
There are no specific requirements for the door "U"
values. Insulated doors are recommended.
3.
Perimeter Insulation: For heated occupied spaces, the
slabs-on-grade shall be thermally isolated by providing
perimeter insulation on the interior of foundation walls.
The requirements are listed below in Table 6.3.
Table 6.3
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 48oF
outdoor temperature without refrigeration.
B. For all locations where the outdoor winter design temperatures are
below -1oC (30oF) 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
of 85 m3/min (3000 CFM). The general exhaust air systems, from which
the heat is to be extracted, shall also have capacity in excess of 85
m3/min (3000 CFM) per exhaust fan, and shall be of continuously
operating type. 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 OoC (32oF) ambient air temperatures.
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