Refrigeration – Refrigeration producer – Sorbent type
Patent
1996-08-15
1998-03-31
Doerrler, William
Refrigeration
Refrigeration producer
Sorbent type
62148, 62480, F25B 1708
Patent
active
057325693
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an adsorption type heat exchanger utilizing for cooling operation the coolant adsorbing and desorbing functions of a solid adsorbent, a method of controlling the cold output of the same cooler, and a fin type adsorbent heat exchanger used for the same cooler. More particularly, the invention concerns an adsorption type cooler, which has high COP (coefficient of product), can suppress variations of the adsorption efficiency of adsorbent and can provide stable cold blast for long time.
PRIOR ART
Adsorption type coolers which utilize the coolant adsorbing/desorbing function of a solid adsorbent for cold generation or heat pump operation, have many advantages such as the capability of effectively utilizing low class heat sources (at 50.degree. to 85.degree. c.), for instance plant waste heat, hot water obtainable with solar heat collectors or the like, etc. and also less movable parts of compressors and the like, low equipment cost, less operating noise, etc. compared to compressor type coolers.
This type of adsorption type cooler usually uses water, alcohol, etc. as coolant, and employs a plurality of juxtaposed adsorbent heat exchangers accommodating a solid adsorbent, such as silica gel, zeolite, active carbon, active alumina, etc. In operation, adsorption and desorption of the coolant to and from the adsorbent are caused repeatedly while supplying the low class heat source for regeneration and the cooling water alternately to the heat exchanger. Thus, the evaporation latent heat of the coolant is utilized to obtain cold load output.
FIG. 8 shows the structure of an adsorption type cooler, to which the invention is applied. This cooler comprises two adsorbent heat exchangers 1 and 2 accommodating a solid adsorbent, a condenser 7 coupled to the heat exchangers 1 and 2 via respective vapor discharge valves 3 and 4, an evaporator (or coolant tank) 9 coupled to the heat exchangers 1 and 2 via respective vapor suction valves 5 and 6, a load water duct line HI for outputting cold water while heat exchange with coolant is carried out in the evaporator 9, a cooling water supply duct line B for supplying cooling water for adsorbing coolant, having been evaporated through heat exchange with load water in the evaporator 9, to heat exchange tubes in the heat exchangers 1 and 2, a cooling water return duct line E for draining heat-absorbed cooling water having been passed through one of the adsorbent heat exchangers 1 and 2 to the outlet side, a heat source water supply duct line C for supplying regeneration heat source water to the heat exchange tube of the other one of the heat exchangers 1 and 2 that has sufficiently adsorbed coolant to cause the coolant to be evaporated and desorbed from the adsorbent, a heat source water return duct line D for draining the heat source water heat robbed through the desorption to the outlet side, and a condensing cooling water duct line A for heat robbing and condensing evaporated coolant having been evaporated in the desorbing operation noted above and led into the condenser 7 through the vapor discharge valves 3 and 4.
The adsorbent heat exchangers 1 and 2 are housed in a vacuum housing 33 and isolated from each other by a partitioning wall 34, and they are capable of normal temperature evaporation of the coolant which is constituted by alcohol and water. The same structure and principles apply to the case where three or more adsorbent heat exchangers are employed.
The cooling water supply duct line B is branched from the condensing cooling water duct line A, which is coupled via a pump 23 to the heat exchange tube 8 in the condenser 7 and thence to the downstream side of the cooling water return duct line E.
Designated at 15 is an inlet valve assembly comprising four valves for switching supply duct lines. That is, the valve assembly is used to switch the cooling water supply duct line B and the heat source water supply duct line C to bring about an adsorbing and a desorbing process of the adsorbent heat exchangers 1 and 2 alter
REFERENCES:
patent: 1774820 (1930-09-01), Williams
patent: 1897980 (1933-02-01), Hulse
patent: 1908413 (1933-05-01), Elfving
patent: 2340887 (1944-02-01), Erland Af Kleen
patent: 4694659 (1987-09-01), Shelton
patent: 4976117 (1990-12-01), Crozat et al.
patent: 5024064 (1991-06-01), Yonezawa et al.
patent: 5359864 (1994-11-01), Yamada
Fujii Makoto
Komatu Fujio
Sanada Masaru
Yamamoto Makota
Doerrler William
Mayekawa Mfg. Co., Ltd.
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