Abstract:
The behaviour of natural convective buoyancy-driven flows within
a hot-water store due to the forced passage of colder water
through the heat-exchanger's pipe are reviewed in the light of
recent advances in experimental
throughout the literature. The
exchanger designs, for natural
unworkable for the engineer
complication arises because the
heat exchanger are sensitive to
and numerical studies, reported
empirical development of heat
convection problems, are often
with a specification. The
heat transfer performance of the
the initial boundary conditions
of the problem, ranging from the initial charged temperature of
the water in the insulated tank of a fixed
dimensíon, to the
physical properties of the heat-exchanger's pipe. It was
concluded that an improvement in the heat transfer performance
can be derived by determining the optium length and the
orientation of the
heat-exchanger's arrangement. Further benefits
are derived by correlating the thermal convective behaviour,
within the hot-water store, with the forced passage of colder
water through the heat exchanger's pipe. A convective flow model,
based upon the experimental results, is described to advance the
heat
exchanger design principles in the situation of transient
natural convection. Assumptions employed in the experimental work
confirm that realistic and reasonable results can be obtained
from the thermal analysis of the vertical cylindrícal store in
two-dimensions.