F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
62/37
F25D 21/00 (2006.01)
Patent
CA 1276476
ABSTRACT The invention provides a full flow vaporizer for use in a refrigeration system employing hot gas from the compressor to periodically defrost the cooling coil, or coils where multiple coils are employed. The hot gas cooled in the defrosting coil produces liquid refrigerant droplets that may damage the expensive compressor. The vaporizer usually consists of three concentric circular cross-section tubes forming a first inner passage, a concentric second annular passage, and a concentric third annular passage. The inner tube receives the fluid from the coil and has one end blocked. It is provided in its wall with a plurality of fine bores directing the fluid forcefully radially outwards under the action of the high velocity gas component of the fluid against the inner wall of the middle tube, which is heated by the hot gas that is passed through the third annular passage before being fed to the coil to perform the defrost function. The flow capacities of the passages and the bores are chosen to be in a specific range of flow capacities relative to one another, usually in the range 0.5 to 1.5, preferably in the range 0.9 to 1.2, so that when not in use the vaporizer has no appreciable effect on the remainder of the system. The vaporizer allows refrigerant to pass through it in either direction, and this is particularly advantageous in a heat pump installation.
550010
Gowling Lafleur Henderson Llp
Gregory Charles
LandOfFree
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