Chapter hvac engineering Fundamentals: Part 1 Introduction

6.6.7
Insulation
Pipe insulation is required whenever the temperature of the fluid in
the pipe is significantly different from the ambient temperature
around the pipe. This covers most heating and cooling applications.
An exception is condensate return piping which may be left uninsu-
lated to allow any flash steam to condense. In such a case, vagrant
heat should be determined not to be a problem.
The required thermal resistance of the insulation is determined
from applicable energy or building codes, the insulation manufac-
turer’s recommendations, and calculations based on acceptable energy
losses in the piping system.
Design Procedures: Part 4
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