ASHRAE FUN IP CH 4 HEAT TRANSFER
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ASHRAE FUN IP CH 4 Document Information:
Title
HEAT TRANSFER
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
Publication Date:
Jan 1, 2009
Scope:
Two-phase flow is encountered extensively in the HVAC&R
industries. A combination of liquid and
vapor refrigerant exists in flooded coolers, direct-expansion coolers,
thermosiphon coolers, brazed
and gasketed plate evaporators and condensers, and tube-in-tube
evaporators and condensers, as well
as in air-cooled evaporators and condensers. In heating system pipes,
steam and liquid water may
both be present. Because the hydrodynamic and heat transfer aspects of
two-phase flow are not as
well understood as those of single-phase flow, no comprehensive model
has yet been created to
predict pressure drops or heat transfer rates. Instead, the
correlations are for specific thermal
and hydrodynamic operating conditions.
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