Heat exchange – Side-by-side tubular structures or tube sections – With manifold type header or header plate
Patent
1995-12-29
1998-09-15
Ferensic, Denise L.
Heat exchange
Side-by-side tubular structures or tube sections
With manifold type header or header plate
165175, 165907, 165153, F28F 902
Patent
active
058065865
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
BACKGROUND OF THE RELATED ART
In the case of the parallel duct system of a plate heat exchanger, it is difficult to achieve a uniform distribution of the refrigerant mass flow. The non-uniform distribution is attributable, above all, to a buildup of the liquid refrigerant components at the end of the distributor duct. This means that the exchanger sections located at the rear end are loaded with more liquid refrigerant than those on the inlet side. In this case, it may even happen that only gaseous refrigerant flows through the inlet-side sections, while the liquid component flows through the rear sections. This is accompanied by poor regulatability in the partial-load mode and a power loss under full load.
In a metering device for the refrigerant, it is known per se (U.S. Pat. No. 5,097,866) to arrange a porous body in the flow duct of the refrigerant. The porous body serves there as a filter and throttle element.
SUMMARY OF THE INVENTION
Proceeding from this, the object on which the invention is based is to develop a device which guarantees a largely uniform allocation of the oncoming two-phase refrigerant mass flow to the individual exchanger ducts.
To achieve this object, the feature combination specified in Patent Claim 1 is proposed. Advantageous embodiments and developments of the invention emerge from the dependent claims.
The solution according to the invention is based primarily on the notion that the liquid component of the oncoming refrigerant mass flow can be prevented from "shooting through" as far as the end of the distributor duct by the incorporation of suitable parallel-throughflow pores into the distributor duct and can be allocated more uniformly to the individual distributor sections by means of neutralizing flow within the distributor duct. In order to achieve this, it is proposed, according to the invention, that a porous body having a multiplicity of parallel-throughflow pores or passage orifices be arranged in the distributor duct between the refrigerant inlet and the branch points of the exchanger ducts, that the porous body be arranged in an outer throttle insert extending at least over part of the length of the distributor duct, and that throttle orifices leading to the exchanger ducts be arranged in the wall of the throttle insert.
According to a preferred embodiment of the invention, the porous body is designed as a hollow body with a cavity open on the inlet side and extending along the distributor duct and with an outer surface containing the pores or passage orifices, the hollow body being closed on its bottom located opposite the inlet side and likewise provided with passage orifices and being capable of extending partially or completely over the length of the distributor duct. In adaptation to the flow-off to the exchanger ducts, the hollow body expediently has an outer surface tapered conically from the inlet side towards the closed distributor end.
The throttle orifices of the outer throttle insert are expediently designed as radial bores in its wall. The preferably hollow-cylindrical outer throttle insert closed at the bottom is arranged releasably, together with the porous body, in the distributor duct and can therefore easily be exchanged for another or be subsequently inserted into an already existing evaporator. In order to guarantee a controlled distribution to the individual exchanger ducts, the throttle orifices of the throttle insert are preferably at a . . . the distance between the branch points of the exchanger ducts . . .
FIG. 1 shows a diagram of a conventional plate evaporator in a refrigerant circuit without a throttle insert;
FIG. 2 shows a diagram corresponding to that of FIG. 1, with a throttle insert in the distributor duct of the plate evaporator;
FIG. 3 shows a partial cross sectional side view of a throttle insert with a porous body for a plate evaporator.
FIGS. 1 and 2 show diagrammatically a detail of a refrigerant circuit with an expansion valve 10 and an evaporator 12. The evaporator 12 is designed as a plate heat
REFERENCES:
patent: 1662236 (1928-03-01), Coupland
patent: 2097602 (1937-11-01), Rohlin
patent: 2555055 (1951-05-01), Ort
patent: 2934322 (1960-04-01), Hazard
patent: 3610538 (1971-10-01), Enders
patent: 3976128 (1976-08-01), Patel et al.
Patents Abstracts of Japan; M-1048, Nov. 14, 1990, vol. 14, No. 519, English language abstract for Japanese Patent No. 2-217764, dated Aug., 1990.
Patents Abstract of Japan; M-1213, Feb. 21, 1992, vol. 16, No. 72, English language abstract for Japanese Patent No. 3-260567, dated Nov., 1991.
Osthues Josef
Petz Manfred
Zeitvogel Bernd
Atkinson Christopher
Ernst Flitsch GmbH & Co.
Ferensic Denise L.
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