![]() ![]() Therefore, any insulation installed outdoors must have a protective coating or covering to meet energy codes. In addition to the insulation thickness, section 6.4.4.1.1 in ASHRAE 90.1 and section C402.2.10.1 of the IECC require that all insulation installed outdoors must be protected from damage due to sunlight, moisture, maintenance, and wind. 2 Hot pipes require anywhere from 1" to 5" of insulation depending on size and temperature. ![]() The thickness required for low temperature pipes, like refrigerant and chiller water, is less than higher temperature pipes and smaller pipes require less insulation as well.1 In general, refrigerant suction lines and chilled water pipes require either 1/2" or 1" insulation depending on the size and temperature of the pipes. If the insulation is not within the range, it can still be used but a thickness must be calculated using a supplied calculation. These sections also give the thermal conductivity range at a specified mean temperature that the insulation must meet for the table to be applicable. (Example, “old” value for offices = 1.3 watts per square foot, “new” value for offices = 1.0 watt per square foot).For pipes, section 6.4.4.1.3 in ASHRAE 90.1 and section C403.2.10 in the IECC contain the identical table that shows the insulation thickness required depending on the pipe operating temperature and the size of the pipe. Potential loophole for indoor lighting power density in that Standard 90.1-2001 has the “old” lighting power densities, while Chapter 8 of the 2003 IECC has the “new” lighting power densities.More detailed outdoor lighting power requirements in Standard 90.1-2007.Revision of the additional lighting power allowance for retail displays to lower the allowance for some categories of merchandise in Standard 90.1-2007.More strict requirements for VAV fan control in Standard 90.1-2007.Energy recovery ventilation systems in Standard 90.1-2007.Fan power limitation in Standard 90.1-2007.A requirement for demand controlled ventilation in high occupancy spaces in Standard 90.1-2007.Less strict requirements for vestibules in cold climates in Standard 90.1-2007. ![]() ![]()
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