Absorption refrigeration unit

Details Absorption refrigeration unit Absorption refrigeration unit

1995-08-25

1997-04-15

Doerrler, William

Refrigeration

Automatic control

Of closed system sorbent type

62497, F25B 1500

Patent

active

056198590

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The present invention relates to a double effect absorption refrigeration unit which mainly uses water as a refrigerant and an aqueous solution of lithium bromide as an absorbent solution, respectively, and comprises an evaporator, an absorber, a high temperature generator, a low temperature generator and a condenser.
2. Background Art
A conventional absorption refrigeration unit comprises, as disclosed in Japanese patent application laid-open No. Sho 63-251764 and shown in FIG. 3, an evaporator A having a refrigerant applicator I and a water cooling pipe W; an absorber B which is disposed in a single vessel U, adjacent to the evaporator A across an eliminator M, and is provided with a concentrated solution applicator S and a cooling water piping R; a high temperature generator C, which is connected with the absorber B through a solution pump G, a low temperature heat exchanger L and a high temperature heat exchanger H and uses a burner V as a heating source, for generating a refrigerant from a diluted solution into which a large amount of refrigerant has been absorbed by the absorber B; a low temperature generator D, which has a heater K through which refrigerant vapors generated in the high temperature generator C are passed, for generating the refrigerant from the solution of intermediate concentration which has been regenerated by the high temperature generator C and passed through the high temperature heat exchanger H; and a condenser E, which is disposed in a single vessel T together with the low temperature generator D, for condensing the refrigerant vapors, generated in the respective generators C, D, by means of a cooling water piping J arranged in succession to a latter part of the cooling water piping R in the absorber B. The refrigerant spiraled in the evaporator A is evaporated and thereby cooled water to be supplied to a cooling load is taken into the water cooling pipe W.
In the above described construction, an amount of heat applied by the burner V is varied by adjustment of openings of a fuel control valve X, and an outlet temperature of cooled water is detected by temperature detecting means Y provided at an outlet of the water cooling pipe W. The opening of the valve X is controlled via a controller F according to changes of the temperature of the cooled water indicating the cooling load, as shown in FIG. 4. When outside air is equal in temperature but is lower in humidity, a real load decreases and accordingly the amount of heat applied by the burner V can be reduced to attain an energy-saving. Because of this, in the conventional type refrigeration unit, an inlet temperature of the cooling water downstream from an outside cooling tower (not shown), which correlates with a value of humidity, is detected by temperature detecting means Z, so that, when the inlet temperature of the cooling water is low, the change of the opening in relation to the inlet temperature of the cooled water is sloped gently and an upper limit of the openings is reduced to have a small value.
However, with this conventional construction, when the inlet temperature of the cooling water is low, the opening of the fuel control valve X is uniformly regulated to a small degree. Due to this, the amount of heat is governed and restricted by the inlet temperature of the cooling water, even when a related combustion of 100% is desired at for example start-up at which the cooling water is low in temperature, for a quick shift to a normal operation, or when full exertion of capacity is desired for quick response to a rapid increase of load. Due to this, a problem occurs that the capacity can be insufficiently exerted to cause a delay in response.
In addition, the construction, with which the amount of heat in the high temperature generator C is restricted in dependence on the inlet temperature of the cooling water when the inlet temperature of the cooling water is low, can restrict an increase of pressure in the high temperature generator C to some extent, but cannot cope with abnormal condit

REFERENCES:
patent: 4164128 (1979-08-01), Newton
patent: 4251997 (1981-02-01), Newton
patent: 4498307 (1985-02-01), Hibino et al.
patent: 4706464 (1987-11-01), Kreutmair
patent: 5156013 (1992-10-01), Arima et al.
patent: 5477696 (1995-12-01), Takahata et al.

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