Evaporator with aerodynamic first dimples to suppress whistling noise
a technology of evaporator and dimple, which is applied in the direction of heat exchanger fins, stationary conduit assemblies, lighting and heating apparatus, etc., can solve the problems of tonal noise, tonal noise, and flow of cooling fluid in this type of evaporator can produce noise, so as to reduce refrigerant pressure drop, significantly sacrifice cooling capacity, and suppress or eliminate the effect of instability
Inactive Publication Date: 2006-10-19
DELPHI TECH INC
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Benefits of technology
The present invention relates to an improved design for an evaporator used in heating and air conditioning systems for automotive vehicles. The invention addresses the issue of tonal noise caused by the flow of cooling fluid over the first dimples in the evaporator. The invention provides aerodynamic first dimples with a unique shape that reduces the instability caused by the gaseous refrigerant flow and also reduces the refrigerant pressure drop. The invention also includes a plurality of pairs of plates with the aerodynamic first dimples in a heat exchanger assembly, which suppresses or eliminates the tonal noise without sacrificing cooling capacity.
Problems solved by technology
Unfortunately the flow of cooling fluid in this type of evaporator can produce a noise, particularly a “whistling”, i.e., a tonal noise emanating from a plate-type evaporator used in certain automotive climate control systems under transient conditions.
It is believed that this tonal noise occurs when gaseous refrigerant at sufficiently high velocities flows over the first dimples.
It is further believed that the tonal noise is caused by periodic flow instability (manifested as vortices) in the wake of the first dimples.
Method used
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[0015] A heat exchanger assembly is variously shown in the Figures and includes as a basic component at least one pair 20 of plates 22. The plates 22 can be identical and disposed in mirror relationship to one another. The plates 22 have mating edges 24 and a concave region delimited by the edges 24 to define a fluid passage 26. The assembly includes a plurality of pairs 20 of the plates 22 disposed in series for fluid flow from a pass through one pair 20 of plates 22 to a pass through the next pair 20 of plates 22, as illustrated by the arrows in FIG. 3. Each pair 20 of plates 22 includes a central rib 28 to define a U-shaped passage 26 having a fluid entering leg and a fluid exiting leg interconnected by an open bottom interconnecting the legs below the lower end of the engaging ribs 28. The plates 22 have tubular projections 30 defining an inlet for entering fluid to the passage 26 and an outlet for exiting fluid from the passage 26 to thereby establish a direction of fluid flow,...
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A heat exchanger assembly including a plurality of pairs of plates disposed in series for fluid flow from a pass through one pair of plates to a pass through the next pair of plates. Each pair of plates includes a central rib to define a U-shaped passage having a fluid entering leg and a fluid exiting leg interconnected by an open bottom interconnecting the legs below the lower end of the engaging ribs. A plurality of first dimples project into the passage to interact with fluid flow through the passage and each of the first dimples has an aerodynamic, e.g., tear-drop, shape to reduce whistling noise in the latter pairs of plates.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a heat exchanger assembly, and more particularly, to an evaporator for a heating and / or air conditioning system (HVAC) for automotive vehicles. [0003] 2. Description of the Prior Art [0004] An evaporator of the type to which the subject invention pertains exchanges heat between a cooling fluid and air. A stack of virtually identical plates are positioned symmetrically in pairs having mating edges and a concave region delimited by the edges to define a fluid passage. The plates have tubular projections defining an inlet for entering fluid to the passage and an outlet for exiting fluid from the passage to thereby establish a direction of fluid flow. Each inlet is connected to the outlet of the preceding pair of plates and each outlet is connected to the inlet of the next pair of plates. Actually, each pair of plates includes a central rib to define a U-shaped passage having a fluid ent...
Claims
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IPC IPC(8): F28D1/02
CPCF28D1/0341F28D2021/0085F28F2250/02F28F13/06F28F2265/28F28F3/044F28F2215/04
Inventor PAPAPANU, STEVEN J.MEHENDALE, SUNIL S.
Owner DELPHI TECH INC