Uses of mof in an adsorption cooling/heating system

Abstract

The present invention relates to a trithermal adsorption cooling/heating system for refrigerating machine, based on MOF as the solid adsorbent, in certain specific operating ranges, depending on the MOF used. The invention also relates to cooling floor-type or cooling ceiling-type air-conditioning systems, as well as to dehumidification systems, implementing the method or comprising the system according to the present invention.

1 . Trithermal adsorption cooling/heating method or system for refrigerating machine, comprising:
 a. a refrigerating fluid selected from water and alcohols;   b. a condensation module for condensation of said refrigerating fluid, in thermal connection with a water circuit wherein the water temperature at the outlet from the circuit is T c3 ;   c. an evaporation module for evaporation of said refrigerating fluid, in thermal connection with a water circuit wherein the water temperature at the outlet from the circuit is T e3 ;   d. at least one adsorption/desorption module containing a solid adsorbent composed of a porous hybrid metal-organic metal-organic material, selected from zirconium aminoterephthalates such as Zr-UiO-66-NH2, zirconium methanetetrabenzoates such as Zr-UiO-MTB, and aluminium fumarates such as Basolite A520, the adsorption/desorption module being alternately in fluid connection with said condensation module and then said evaporation module, said MOF material being able to adsorb or desorb the refrigerating fluid depending on whether the adsorption/desorption module is in fluid connection with the evaporation module and condensation module respectively, and depending on the temperature T MOF  to which the MOF material is subjected;   characterised in that the system is used alternately in adsorption/desorption mode according to the following operating parameters:   
       in adsorption mode:
 the adsorption/desorption module is in fluid connection with the evaporation module; 
 the MOF material is subjected to a temperature T MOF =T c3  wherein T c3  represents 25° C.±4° C. or 30° C.±4° C., for use of the system in a fan coil unit, or 35° C.±4° C. or 40° C.±4° C., for use of the system in a cooling surface; 
 0.10<p e /P sat(e) ≦0.35; preferably p e /p sat(e) =0.20 or 0.25; and 
 T c3  represents 5° C.±2° C. or 12° C.±3° C., for use of the system in a fan coil unit or cooling surface, respectively; 
 in which: 
 p e /p sat(e)  represents the relative humidity in the evaporation module; 
 p e  represents the pressure of the refrigerating fluid in gaseous phase in the evaporation module; 
 p sat(e)  represents the saturation vapour pressure of the refrigerating fluid at the temperature of absorption of said refrigerating fluid by the porous hybrid metal organic material; 
 
       in desorption mode:
 the adsorption/desorption module is in fluid connection with the condensation module; 
 the MOF material is subjected to a temperature T MOF  such that T max ≧T MOF >T c3 ; wherein T max  is from 60° C. to 100° C.; 
 0.10≦p c /p sat(c) ≦0.20 or 0.15≦p c /p sat(c) ≦0.25; and 
 T c3  represents 25° C.±4° C., 30° C.±4° C., 35° C.±4° C. or 40° C.±4° C., for use of the system as in fan coil unit or cooling surface, respectively; 
 in which: 
 p c /p sat(c)  represents the partial vapour pressure of the refrigerating fluid (or the relative humidity when the refrigerating fluid is water) in the condensation module; 
 p c  represents the pressure of the refrigerating fluid in gaseous phase in the condensation module; 
 p sat(c)  represents the saturation vapour pressure of the refrigerating fluid at the temperature of desorption of said refrigerating fluid from the porous hybrid metal organic material. 
 
     
     
         2 . Method or system according to  claim 1 , wherein the solid adsorbent composed of a porous hybrid metal organic material selected from zirconium aminoterephthalates such as Zr-UiO-66-NH2, and the adsorption/desorption operating parameters are as follows: 
       in adsorption mode:
 the MOF material is subjected to a temperature T MOF =T c3  wherein T c3  represents 30° C.±4° C. or 40° C.±4° C., for use of the system in a fan coil unit or cooling surface, respectively; 
 0.10<p e /p sat(e) ≦0.30; preferably p e /p sat(e) =0.20; and 
 T c3  represents 5° C.±2° C. or 12° C.±3° C., for use of the system in a fan coil unit or cooling surface, respectively; 
 
       in desorption mode:
 the MOF material is subjected to a temperature T MOF  such that T max ≧T MOF >T c3 ; wherein T max  is from 60° C. to 100° C.; 
 0.10≦p c /p sat(c) ≦0.20; and 
 T c3  represents 30° C.±4° C. or 40° C.±4° C., for use of the system in a fan coil unit or cooling surface, respectively. 
 
     
     
         3 . Method or system according to  claim 1 , wherein the solid adsorbent composed of a porous hybrid metal organic material selected from zirconium aminoterephthalates such as Zr-UiO-66-NH2, zirconium methanetetrabenzoates such as Zr-UiO-MTB (MOF-814), and aluminium fumarates such as Basolite A520, and the adsorption/desorption operating parameters are as follows: 
       in adsorption mode:
 the MOF material is subjected to a temperature T MOF =T c3  wherein T c3  represents 25° C.±4° C. or 35° C.±4° C., for use of the system in a fan coil unit or cooling surface, respectively; 
 0.15<p e /p sat(e) ≦0.35; preferably p e /p sat(e) =0.25; and 
 T e3  represents 5° C.±2° C. or 12° C.±3° C., for use of the system in a fan coil unit or cooling surface, respectively; 
 
       in desorption mode:
 the MOF material is subjected to a temperature T MOF  such that T max ≧T MOF >T c3 ; wherein T c3  is as defined above and T max  is from 60° C. to 100° C.; 
 0.15≦p c /p sat(c) ≦0.25; and 
 T c3  represents 25° C.±4° C. or 35° C.±4° C., for use of the system in a fan coil unit or cooling surface, respectively. 
 
     
     
         4 . Method or system according to  claim 1 , wherein the system contains two adsorption/desorption modules and, each alternately in fluid connection with the condensation and evaporation modules, so that, when is in fluid connection with the condensation module, then is in fluid connection with the evaporation module, and vice versa. 
     
     
         5 . Method or system according to  claim 4 , wherein the two adsorption/desorption modules contain the same solid absorbent. 
     
     
         6 . Method or system according to  claim 1 , wherein, when the adsorption/desorption module or is in desorption mode, the heat source for heating the MOF material at the temperature T max ≧T MOF >T c3  is selected from solar panels, atmospheric burners such as natural-gas boilers, geothermal energy or free heat. 
     
     
         7 . Method or system according to  claim 1 , wherein the thermal connection between the refrigerating fluid and the water circuits of the condensation and evaporation modules respectively, is provided by a heat exchanger. 
     
     
         8 . Method or system according to  claim 1 , wherein T e3  represents 5° C.±2° C. in adsorption mode, and T c3  represents 25° C.±4° C. or 30° C.±4° C. in desorption mode. 
     
     
         9 . Method or system according to  claim 1 , wherein T e3  represents 12° C.±3° C. in adsorption mode, and T c3  represents 35° C.±4° C. or 40° C.±4° C. in desorption mode. 
     
     
         10 . Fan coil-type air-conditioning system implementing a method or comprising a system according to  claim 8 . 
     
     
         11 . Cooling floor-type, or cooling ceiling-type, air-conditioning system implementing a method or comprising a system according to  claim 9 . 
     
     
         12 . Method or system according to  claim 1  configured for cooling or heating, in a cooling floor-type or cooling ceiling-type air-conditioning system.