This paper presents the experimental investigation of the thermal and hydraulic characteristics of a novel bare tube heat exchanger prototype, manufactured by using stainless steel tubing with outer diameter of 0.8 mm, under wet condition.
This novel bare tube heat exchanger (BTHX) was manufactured using stainless steel tubes with an outer diameter of 0.8 mm and inner diameter of 0.6 mm, as shown in Figure 1 (a).
These are the separators, the thingies inside that turn a bare tube
into a series of small chambers, trapping gas and allowing a slower release than would otherwise occur.
(2007) Heyns and Bare tube
HX 4500-11,750 Kroger (2010) (1011-2639.5) Bell et al.
It incorporates a volume control damper, bare tube
frost coil (LPHW), panel filters to F4 efficiency, bag filters to G6, CHW cooling coil, LPHW reheat coil, fan and motors.
The refrigeration system features a low maintenance bare tube
condenser coil that reduces the amount of trapped debris, eliminating unnecessary labor costs by requiring cleaning typically only once a year.
Nomenclature Re Reynolds number St Stanton number with insert q Wall heat flux (W/[m.sup.2]) e1, e2 wire diameter (2mm, 3.4mm) h heat transfer coefficient (W/[m.sup.2]K) p1, p2, p3 pitch of the wire insert coil (66mm, 38mm, 22mm) [T.sub.o] outlet temperature (K) of air [T.sub.w] Temperature on the outer wall of the pipe (K) [T.sub.b] Bulk temperature, K [D.sub.e] Equivalent diameter (m) [St.sub.0] Stanton number for bare tube Experimental Setup and Procedure
Experiments are conducted with air to find the forced convection heat transfer coefficient for bare tube. The setup is shown in figure below.
About two years ago, a customer within ABB reported problems with accelerated wastage and corrosion at specific bare tube
regions within the combustor of a municipal incinerator.
In addition, it has a new bare tube
condenser coil in its refrigeration systems, replacing regular fin type condenser coils which tend to trap dirt and debris that can cruise premature failure of the refrigeration compressor.
The modified tubes detected five gases, two of which bare tubes
can't sense: the explosive dinitrotoluene and a derivative of the poison sarin.
Instead, bare tubes
stand on their caps in permanent display holders.