Absorption refrigeration system with multiple absorption

Claim 2

A refrigeration system comprising the following connected to form a closed system; generator means for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; an absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means; a preheat exchanger thermally disposed to absorb heat given off by the action within said absorber; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporater means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therein; another absorber operatively associated with the second compartment of said evaporation heat exchanger so as to draw refrigerant vapor therefrom and thus reduce the pressure with such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus redUce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means for delivering a portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger and into said another absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said another absorber the saturation concentration of refrigerant in solution of refrigerant and absorbent material and for delivering another portion of the solution of refrigerant and absorbent material of increased refrigeration concentration from the first compartment of said evaporation heat exchanger through said preheat exchanger and into said generator means; and second delivery means for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said another absorber and into said generator means.

Claim 3

The refrigeration system in accordance with claim 1 in which said first delivery means and said second delivery means each includes a pump.

Claim 4

The refrigeration system in accordance with claim 1 in which a heat exchanger is interposed in the system so as to effect heat exchange between at least a portion of the condensed refrigerant passing from said condenser into the second compartment of said evaporation heat exchanger and at least a portion of the solution of refrigerant and absorbent material of increased refrigerant concentration that is delivered by said first delivery means from the first compartment of said evaporation heat exchanger.

Claim 5

A refrigeration system comprising the following connected to form a closed system; generator means, including a rectifier section, for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; an absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means; a preheat exchanger thermally disposed to absorb heat given off by the action within said absorber; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporator means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therein; another absorber operatively associated with the second compartment of said evaporation heat exchanger so as to draw refrigerant vapor therefrom and thus reduce the pressure within such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus reduce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means for delivEring a portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger and into said another absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said another absorber the saturation concentration of refrigerant in solution of refrigerant and absorbent material and for delivering another portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger through said preheat exchanger and into said generator means; and second delivery means for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said another absorber to the rectifier section of said generator means.

Claim 6

A refrigeration system comprising the following connected to form a closed system; generator means, including a rectifier section, for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; an absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means; a preheat exchanger thermally disposed to absorb heat given off by the action within said absorber; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporator means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therein; another absorber operatively associated with the second compartment of said evaporation heat exchanger so as to draw refrigerant vapor therefrom and thus reduce the pressure within such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus reduce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means for delivEring a portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger and into said another absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said another absorber the saturation concentration of refrigerant in solution of refrigerant and absorbent material and for delivering another portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger through said preheat exchanger and into said generator means; and second delivery means for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said another absorber to the rectifier section of said generator means.

Claim 7

The refrigeration system in accordance with claim 4 in which said first delivery means and said second delivery means each includes a pump.

Claim 8

A refrigeration system comprising the following connected to form a closed system: generator means, including a rectifier section and an analyzer section, for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; a first absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said first absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said first absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporator means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therewithin; an ambient cooled absorber operatively associated with the second compartment of said evaporation heat exchanger so as to receive refrigerant vapor therefrom and thus reduce the pressure within such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus reduce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of the refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means for delivering at least a portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger and into said ambient cooled absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said ambient cooled absorber the saturation concentration of refrigerant in the solution of refrigerant and absorbent material; second delivery means for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said ambient cooled absorber to the rectifier section of said generator means; a generator fluid heat exchanger; third delivery means for delivering absorbent material from the analyzer section of said generator means to said generator flUid heat exchanger and from said generator fluid heat exchanger and into said first absorber; and fourth delivery means for delivering a solution of refrigerant and absorbent material from the rectifier section of said generator means to said generator fluid heat exchanger and from said generator fluid heat exchanger and into said generator means.

Claim 9

A refrigeration system comprising the following connected to form a closed system: generator means, including a rectifier section and an analyzer section, for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; a first absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said first absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said first absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporator means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therewithin; an ambient cooled absorber operatively associated with the second compartment of said evaporation heat exchanger so as to receive refrigerant vapor therefrom and thus reduce the pressure within such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus reduce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of the refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means for delivering at least a portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger and into said ambient cooled absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said ambient cooled absorber the saturation concentration of refrigerant in the solution of refrigerant and absorbent material; second delivery means for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said ambient cooled absorber to the rectifier section of said generator means; a generator fluid heat exchanger; third delivery means for delivering absorbent material from the analyzer section of said generator means to said generator flUid heat exchanger and from said generator fluid heat exchanger and into said first absorber; and fourth delivery means for delivering a solution of refrigerant and absorbent material from the rectifier section of said generator means to said generator fluid heat exchanger and from said generator fluid heat exchanger and into said generator means.

Claim 10

The refrigeration system in accordance with claim 6 in which said first delivery means and said second delivery means each includes a pump.

Claim 11

A refrigeration system comprising the following connected to form a closed system: generator means, including a rectifier section and an analyzer section, for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; a first absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means; a preheat exchanger thermally disposed to absorb heat given off by the action within said absorber; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said first absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said first absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporator means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therein; an ambient cooled absorber operatively associated with the second compartment of said evaporation heat exchanger so as to draw refrigerant vapor therefrom and thus reduce the pressure within such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus reduce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means for delivering a portion of the solution of refrigerant and absorbent material of increased refrigeration concentration from the first compartment of said evaporation heat exchanger and into said ambient cooled absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said ambient cooled absorber the saturation concentration of refrigerant in solution of refrigerant and absorbent material and for delivering another portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger through said preheat exchanger and into said generator means; second delivery means for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said ambient cooled absorber to the rectifier section of said generator means; a generator fluid heat exchanger; third delivery means for delivering absorbent material from the analyzer section of said generator means to said generator fluid heat exchanger and from said generator fluid heat exchanger and into said first absorber; and fourth delivery means for delivering a solution of refrigerant and absorbent material from the rectifier section of said generator means to said generator fluid heat exchanger and from saiD generator fluid heat exchanger and into said generator means.

Claim 12

A refrigeration system comprising the following connected to form a closed system: generator means, including a rectifier section and an analyzer section, for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; a first absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means; a preheat exchanger thermally disposed to absorb heat given off by the action within said absorber; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said first absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said first absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporator means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therein; an ambient cooled absorber operatively associated with the second compartment of said evaporation heat exchanger so as to draw refrigerant vapor therefrom and thus reduce the pressure within such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus reduce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means for delivering a portion of the solution of refrigerant and absorbent material of increased refrigeration concentration from the first compartment of said evaporation heat exchanger and into said ambient cooled absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said ambient cooled absorber the saturation concentration of refrigerant in solution of refrigerant and absorbent material and for delivering another portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger through said preheat exchanger and into said generator means; second delivery means for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said ambient cooled absorber to the rectifier section of said generator means; a generator fluid heat exchanger; third delivery means for delivering absorbent material from the analyzer section of said generator means to said generator fluid heat exchanger and from said generator fluid heat exchanger and into said first absorber; and fourth delivery means for delivering a solution of refrigerant and absorbent material from the rectifier section of said generator means to said generator fluid heat exchanger and from saiD generator fluid heat exchanger and into said generator means.

Claim 13

The refrigeration system in accordance with claim 8 in which said first delivery means and said second delivery means each includes a pump.

Claim 14

A refrigeration system comprising the following connected to form a closed system: generator means, including a rectifier section and an analyzer section, for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; a first absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said first absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said first absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporator means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therewithin; a preheat exchanger thermally disposed to absorb heat given off by the action within said first absorber to preheat and supply to said generator means solution of refrigerant and absorbent material that originates from said evaporation heat exchanger; another absorber operatively associated with the second compartment of said evaporation heat exchanger so as to receive refrigerant vapor therefrom and thus reduce the pressure within such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus reduce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of the refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means for delivering at least a portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger and into said another absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said another absorber the saturation concentration of refrigerant in the solution of refrigerant and absorbent material; second delivery means for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said another absorber to the rectifier section of said generator means; an inductor having a secondary inlet connected to receive refrigerant vapor from said evaporator means, a primary nozzle for receiving absorbent material, and a discharge connected to discharge absorbent material into said first absorber; a generator fluid heat exchanger; third delivery means for delivering absorbent material from the analyzer section of said generator means to said generator fluid heat exchanger and from said generator fluid heat exchanger to the primary nozzle of said inductor; and fourth delivery means for delivering a solution of refrigerant and absorbent material from the rectifier section of said generator means to said generator fluid heat exchanger and from said generator fluid heat exchanger and into said generator means.

Claim 15

A refrigeration system comprising the following connected to form a closed system: generator means, including a rectifier section and an analyzer section, for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; a first absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said first absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said first absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporator means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therewithin; a preheat exchanger thermally disposed to absorb heat given off by the action within said first absorber to preheat and supply to said generator means solution of refrigerant and absorbent material that originates from said evaporation heat exchanger; another absorber operatively associated with the second compartment of said evaporation heat exchanger so as to receive refrigerant vapor therefrom and thus reduce the pressure within such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus reduce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of the refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means for delivering at least a portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger and into said another absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said another absorber the saturation concentration of refrigerant in the solution of refrigerant and absorbent material; second delivery means for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said another absorber to the rectifier section of said generator means; an inductor having a secondary inlet connected to receive refrigerant vapor from said evaporator means, a primary nozzle for receiving absorbent material, and a discharge connected to discharge absorbent material into said first absorber; a generator fluid heat exchanger; third delivery means for delivering absorbent material from the analyzer section of said generator means to said generator fluid heat exchanger and from said generator fluid heat exchanger to the primary nozzle of said inductor; and fourth delivery means for delivering a solution of refrigerant and absorbent material from the rectifier section of said generator means to said generator fluid heat exchanger and from said generator fluid heat exchanger and into said generator means.

Claim 16

A refrigeration system comprising the following connected to form a closeD system: generator means, including a rectifier section for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means, the vapor pressure within said condenser being at substantially the same value as the vapor pressure within said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; an absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means, at least a portion of said absorber being ambient cooled; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporator means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therewithin; another ambient cooled absorber operatively associated with the second compartment of said evaporation heat exchanger so as to receive refrigerant vapor therefrom and thus reduce the pressure within such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus reduce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of the refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means, including a pump, for delivering at least a portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger and into said another ambient cooled absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said another ambient cooled absorber the saturation concentration of refrigerant in the solution of refrigerant and absorbent material; and second delivery means, including a pump, for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said another ambient cooled absorber to the rectifier section of said generator means.

Claim 17

A refrigeration system comprising the following connected to form a closeD system: generator means, including a rectifier section for vaporizing refrigerant; a condenser for condensing refrigerant received from said generator means, the vapor pressure within said condenser being at substantially the same value as the vapor pressure within said generator means; evaporator means for evaporating refrigerant and providing a cooling effect; an absorber for receiving absorbent material from said generator means and for absorbing refrigerant vapor received from said evaporator means, at least a portion of said absorber being ambient cooled; an evaporation heat exchanger having a first compartment and a second compartment disposed in heat transfer relationship with the first compartment, said evaporation heat exchanger being operatively associated with said absorber and with said condenser so that a solution of refrigerant and absorbent material passes from said absorber into the first compartment of said evaporation heat exchanger and so that condensed refrigerant passes from said condenser into the second compartment of said evaporation heat exchanger, said evaporation heat exchanger also being operatively associated with said evaporator means so that a portion of the refrigerant evaporated within said evaporator means passes into the first compartment of said evaporation heat exchanger and is absorbed by the absorbent material disposed therewithin; another ambient cooled absorber operatively associated with the second compartment of said evaporation heat exchanger so as to receive refrigerant vapor therefrom and thus reduce the pressure within such second compartment and thereby effect evaporation of at least a portion of the condensed refrigerant within such second compartment and thus reduce the temperature of the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger and thus increase the saturation concentration of the refrigerant in the solution of refrigerant and absorbent material disposed within the first compartment of said evaporation heat exchanger; first delivery means, including a pump, for delivering at least a portion of the solution of refrigerant and absorbent material of increased refrigerant concentration from the first compartment of said evaporation heat exchanger and into said another ambient cooled absorber at a pressure that is higher than the pressure within the first compartment of said evaporation heat exchanger to thereby further increase within said another ambient cooled absorber the saturation concentration of refrigerant in the solution of refrigerant and absorbent material; and second delivery means, including a pump, for delivering at least a portion of the solution of refrigerant and absorbent material that is further increased in concentration of refrigerant from said another ambient cooled absorber to the rectifier section of said generator means.