Sorption heat pump and sorption cycle

Abstract

A sorption heat pump including a gaseous refrigerant and a liquid solvent; a diluted solution and a concentrated solution, wherein the diluted solution and the concentrated solution are single phase mixes of the solvent and the refrigerant; an absorber in which the diluted solution absorbs the refrigerant at a high-pressure level and emits a first heat; and a cooling device including plural cooling registers, each cooling register including an air cooler and an expansion valve in which the concentrated solution is expanded to a low-pressure level during normal operation of the cooling register so that the concentrated solution absorbs a second heat from ambient air in the air cooler and expels the refrigerant, wherein each air cooler is defrostable individually by supplying a third heat to the air cooler in a defrost operation of the air cooler that interrupts the normal operation of the air cooler.

What is claimed is: 
     
         1 . A sorption heat pump, comprising:
 a gaseous refrigerant and a liquid solvent;   a diluted solution and a concentrated solution, wherein the diluted solution and the concentrated solution are single phase mixes of the solvent and the refrigerant;   an absorber in which the diluted solution absorbs the refrigerant at a high-pressure level and emits a first heat; and   a cooling device including plural cooling registers, each respective cooling register including a respective air cooler and a respective expansion valve in which the concentrated solution is expanded to a low-pressure level during normal operation of the respective cooling register so that the concentrated solution absorbs a second heat from ambient air in the respective air cooler and expels the refrigerant, wherein each respective air cooler is defrostable individually by supplying a third heat to the respective air cooler in a defrost operation of the respective air cooler that interrupts the normal operation of the respective air cooler,   wherein the cooling device includes a bypass that runs a partial flow of the concentrated solution through the respective cooling register at the high-pressure level during the defrost operation of the respective cooling register so that the partial flow of the concentrated solution emits the third heat.   
     
     
         2 . The sorption heat pump according to  claim 1 , wherein the partial flow is run through a respective check valve parallel to the respective expansion valve of the respective cooling register after emitting the third heat in the defrost operation and thereafter the partial flow is run back into the concentrated solution. 
     
     
         3 . The sorption heat pump according to  claim 1 , wherein the cooling device includes cut off valves which alternatively run the concentrated solution out of the respective air cooler to the absorber in the normal operation of the respective cooling register or run the concentrated solution out of the bypass to the respective air cooler in the defrost operation of the respective cooling register. 
     
     
         4 . The sorption heat pump according to  claim 1 , wherein the cooling device includes a control valve that controls a residual flow of the concentrated solution parallel to the bypass. 
     
     
         5 . The sorption heat pump according to  claim 1 , wherein the solvent is water and the refrigerant is ammonia. 
     
     
         6 . A sorption cycle including
 a gaseous refrigerant and a liquid solvent, and   a diluted solution and a concentrated solution, wherein the diluted solution and the concentrated solution are single phase mixes of the solvent and the refrigerant, the sorption cycle comprising:   the diluted solution absorbing the refrigerant and emitting a first heat at a high-pressure level;   expanding the concentrated solution to a low-pressure level during normal operation in plural cooling registers, each respective cooling register including a respective air cooler, so that the concentrated solution absorbs a second heat from ambient air in the respective air cooler and thereby expels the refrigerant, the respective air cooler being defrosted by supplying a third heat to the respective air cooler in a defrost operation of the respective air cooler that interrupts the normal operation of the respective air cooler; and   a respective partial flow of the concentrated solution emitting the third heat at the high-pressure level during the defrost operation in the respective air cooler.   
     
     
         7 . The sorption cycle according to  claim 6 , further comprising: running the concentrated solution through each respective air cooler in one direction during the normal operation and in an opposite direction during the defrost operation.