Chiller with hybrid falling film evaporator

Details Chiller with hybrid falling film evaporator Chiller with hybrid falling film evaporator

1996-11-19

1998-11-24

Bennett, Henry A.

Refrigeration

Refrigeration producer

With lubricant handling means

165117, F25B 4302

Patent

active

058392947

ABSTRACT:
A vapor compression refrigeration system for cooling a liquid in which there is a spray dispenser for distributing liquid refrigerant over the tubes in a shell-and-tube type evaporator. The differential pressure in the refrigerant flow loop across the evaporator is the sole means of producing a flow through the spray dispenser. The evaporator is operated as a hybrid falling film heat exchanger, that is, in a semi-flooded condition. The lower portion of the evaporator shell is flooded with liquid refrigerant to wet the lower tubes in the tube bundle while the tubes in the upper portion are wetted only by refrigerant spray from the spray dispenser. The system is operated in a steady state condition whereby at least twenty-five percent (25%) of the tubes in the evaporator operate in a flooded heat transfer mode. The system allows a reduction in the amount of refrigerant charge in the system while at the same time avoiding the use of a recirculating system and pump.

REFERENCES:
patent: 3022638 (1962-02-01), Caswell et al.
patent: 3191396 (1965-06-01), Ruddock
patent: 3768539 (1973-10-01), Chamberlain et al.
patent: 4154642 (1979-05-01), Mattern et al.
patent: 4520866 (1985-06-01), Nakajima et al.
patent: 5561987 (1996-10-01), Hartfield et al.
patent: 5645124 (1997-07-01), Hartfield et al.

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