Heat exchange – Side-by-side tubular structures or tube sections – With manifold type header or header plate
Patent
1999-02-09
2000-12-19
Lazarus, Ira S.
Heat exchange
Side-by-side tubular structures or tube sections
With manifold type header or header plate
165148, 165153, 165152, F28D 706
Patent
active
061616168
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a dual flow or double-flow hard-soldered or brazed flat tube evaporator for a motor vehicle air conditioning equipment with one row in the air flow direction, the evaporator being made of aluminum or an aluminum alloy and having the features of the preamble of claim 1. Such a double-flow flat tube evaporator is known from the DE-195 15 526 C1 among further embodiments with more than two flows.
Commercially available flat tube evaporators of such a construction have a structural depth of 60 mm in prototypes which just have become public, while the standard structural depth in comparable plate evaporators is 66 to 100 mm.
As the mentioned publication, according to which the preamble of claim 1 is formed, already shows, in the past efforts have been made to increase the efficiency going over to evaporators with more than two flows, if desired.
Moreover, in double-flow evaporators as well as in evaporators having more than two flows, efforts have been made to feed the individual flat tubes in a proportion of liquid to gaseous refrigerant which is as constant as possible, and for this purpose to distribute the refrigerant to the inlets of groups of flat tubes on the inlet side, as it is already provided in the mentioned kind of evaporators, according to which the preamble of claim 1 is formed. In equivalence thereto, the idea to carry out this distribution furthermore with respect to each individual flat tube, which idea is at present not traceable in the prior art, is considered to be included in the kind of evaporators referred to in the preamble of claim 1. Such a distribution to individual tubes of an evaporator, but not expressively of a flat tube evaporator, is known per se from the EP-A1-0 566 899.
In all such distributions of the refrigerant to flat tubes on the inlet side, at the same time a distribution to all chambers of the respective flat tube is effected, which chambers extend one after the other in the direction of the structural depth of the evaporator. In this case, the structural depth of the evaporator is identical to the corresponding breadth dimension of the flat tube in a borderline case. The breadth dimension of the flat tube, however, can also be somewhat smaller, in particular if a corresponding overhang of the zig zag fins is included on a front side.
The fitting space available in the motor vehicle is always a main problem, in particular when fitting structural members into motor vehicles. Therefore, with structural members to be fitted into motor vehicles, there generally always is a tendency to minimize the outer dimensions with a useful effect being predetermined. It has to be taken as granted that this basic idea was also the basis in all known generic flat tube evaporators referred to in the preamble of claim 1 which are on the market. One can derive from this fact that the experts did not consider a structural depth of less than 60 mm to be appropriate in such flat tube evaporators, taking into consideration all requirements.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is based on the recognition that this assumption is based on a precondition.
The invention is rather based on the recognition that even with otherwise constant parameters of known generic flat tube evaporators, a reduction of the structural depth is at least partially compensated by the fact that in the process the efficiency of the distribution means is increased. For with a reduced structural depth, on the inlet side the refrigerant only has to be distributed to a smaller number of chambers of the flat tubes per inlet chamber fed by the distribution duct.
In this sense, the invention describes a way to achieve an optimization by reducing the structural depth instead of by increasing the number of flows to be higher than two.
Correspondingly, the object underlying the invention is to increase the efficiency of a double-flow flat tube evaporator of the type referred to in a manner very simple as to the construction.
This object is solved in a flat tube e
REFERENCES:
patent: 1454107 (1923-05-01), Curran
patent: 3605882 (1971-09-01), Smith et al.
patent: 5076354 (1991-12-01), Nishishita
patent: 5318114 (1994-06-01), Sasaki
patent: 5431217 (1995-07-01), Kadle et al.
patent: 5448899 (1995-09-01), Ohara et al.
Lazarus Ira S.
McKinnon Terrell
Valeo Kilmatechnik GmbH & Co., KG
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