Control device for an absorption system hot and cold water supply apparatus

Claim 2

In a control device for an absorption system hot and cold water supply apparatus for simultaneously supplying hot and cold water having a refrigeration circuit including a direct fired generator controlling the thermo-control capacity of the entire refrigeration circuit and being regulated by a fuel control valve, and hot and cold water circuits associated with said refrigeration circuits such that water in said hot and cold water circuits is repectively heated and cooled by heat exchange with said refrigeration circuit, the improvement comprising a proportional controller means responsive to the thermo-conditions in each of said hot and cold water circuits, each of said proportional controller means being adapted at any given time to control said fuel control valve to control the thermo-control capacity of the entire refrigeration circuit, and thermo-detector means for sensing the thermo-condition of at least one of said hot and cold water circuits and for controlling said thermocondition of the sensed circuit independently from the control of the thermo-control capacity of the entire refrigeration circuit by means of said fuel control valve.

Claim 3

A control device according to claim 1 further comprising selecting means regulated by the magnitude of the load of the cold water circuit and adapted to actuate the proportional controller means associated with the cold water circuit when the load of the cold water circuit is greater than a predetermined load value and to actuate the proportional controller means associated with the hot water circuit when the load of the cold water circuit is less than said predetermined load value.

Claim 4

In a control device for an absorption system hot and cold water supply apparatus supplying hot water and cold water simultaneously in proportion to the respective hot and cold water loads having a direct fired generator for heating a dilute solution comprising a refrigerant and an absorbent, a hot water heat exchange unit receiving the heated refrigerant from said generator, a hot water circuit in heat exchange relationship with said hot water heat exchange unit for supplying hot water, condenser means for cooling refrigerant from said generator, an evaporator comprising a cold water heat exchange unit receiving the cooled refrigerant from said condenser means and a cold water circuit in heat exchange relationship with said cold water heat exchange unit for supplying cold water, an absorber and a heat exchanger; the improvement comprising a first control valve regulating the heat provided by said generator; a hot refrigerant control valve for regulating the amount of refrigerant flowing in said hot water heat exchange unit; a cold refrigerant control valve for regulating the amount of refrigerant flowing in said condenser means; a first porportional controller means including a first thermo-detector sensing the thermo-condition of said cold water circuit, a first cooling-heating changeover switch having a fixed contact point and a pair of movable contact points, the fixed contact point being connected to said first thermo-detector and a first main thermo-controller connected to one of said movable point contacts adapted when actuated to regulate said fuel control valve; a first auxiliary thermo-controller connected to the other of said movable point contacts of said first changeover switch adapted when actuated to regulate said cold refrigerant control valve; a second proportional controller means including a second thermo-detector sensing the thermo-condition of said hot water circuit, a second cooling-heating changeover switch having a fixed contact point and a pair of movable contact points, the fixed contact point being connected to said second thermo-detector and a second main thermo-controller connected to one of said movable point contacts adapted when acutated to regulate said fuel control valve; and a second auxiliary thermo-controller connected to the other of said movable point contacts of said second changeover switch adapted when actuated to regulate said hot refrigerant control valve; and changeover control comparative means coupled to said changeover switches, wherein, said movable contact points of said changeover switches are adapted to be changed from one to another in parallel motion such that said fuel control valve is regulated by the first proportional controller means when the cold water load is greater and by the second proportional controller means when the hot water load is greater.

Claim 5

In a control device for an absorption system hot and cold water supply apparatus supplying hot water and cold water simultaneously in proportion to the respective hot and cold water loads having a direct fired generator for heating a dilute solution comprising a refrigerant and an absorbent, a hot water heat exchange unit receiving the heated refrigerant from said generator, a hot water circuit in heat exchange relationship with said hot water heat exchange unit for supplying hot water, condenser means for cooling refrigerant from said generator, an evaporator comprising a cold water heat exchange unit receiving the cooled refrigerant from said condenser means and a cold water circuit in heat exchange relationship with said cold water heat exchange unit for supplying cold water, an absorber and a heat exchanger; the improvement comprising a first control valve regulating the heat provided by said generator; a hot refrigerant control valve for regulating the amount of refrigerant flowing in said hot water heat exchange unit; a cold refrigerant control valve for regulating the amount of refrigerant flowing in said condenser means; a first porportional controller means including a first thermo-detector sensing the thermo-condition of said cold water circuit, a first cooling-heating changeover switch having a fixed contact point and a pair of movable contact points, the fixed contact point being connected to said first thermo-detector and a first main thermo-controller connected to one of said movable point contacts adapted when actuated to regulate said fuel control valve; a first auxiliary thermo-controller connected to the other of said movable point contacts of said first changeover switch adapted when actuated to regulate said cold refrigerant control valve; a second proportional controller means including a second thermo-detector sensing the thermo-condition of said hot water circuit, a second cooling-heating changeover switch having a fixed contact point and a pair of movable contact points, the fixed contact point being connected to said second thermo-detector and a second main thermo-controller connected to one of said movable point contacts adapted when acutated to regulate said fuel control valve; and a second auxiliary thermo-controller connected to the other of said movable point contacts of said second changeover switch adapted when actuated to regulate said hot refrigerant control valve; and changeover control comparative means coupled to said changeover switches, wherein, said movable contact points of said changeover switches are adapted to be changed from one to another in parallel motion such that said fuel control valve is regulated by the first proportional controller means when the cold water load is greater and by the second proportional controller means when the hot water load is greater.

Claim 6

A contRol device according to claim 3 wherein the refrigerant from said hot water heat exchange unit is recycled back to said generator and said hot refrigerant control valve is positioned in the recycle line.

Claim 7

A control device according to claim 3 wherein said absorption system hot and cold water supply apparatus is a double-effect system having a low pressure generator between a high pressure generator and said condenser means, said cold refrigerant control valve being located between said low pressure generator and said condenser means.