An adsorption heat pump is provided in which water vapor can be efficiently adsorbed and desorbed using a heat source having a lower temperature than ones heretofore in use because the pump employs an adsorbent which has a large difference in water adsorption amount in adsorption/desorption and can
An adsorption heat pump is provided in which water vapor can be efficiently adsorbed and desorbed using a heat source having a lower temperature than ones heretofore in use because the pump employs an adsorbent which has a large difference in water adsorption amount in adsorption/desorption and can be regenerated (release the adsorbate) at a low temperature. The invention provides an adsorption heat pump which comprises an adsorbate, an adsorption/desorption part having an adsorbent for adsorbate adsorption/desorption, a vaporization part for adsorbate vaporization which has been connected to the adsorption/desorption part, and a condensation part for adsorbate condensation which has been connected to the adsorption/desorption part, wherein the adsorbent, when examined at 25�� C., gives a water vapor adsorption isotherm which, in the relative vapor pressure range of from 0.05 to 0.30, has a relative vapor pressure region in which a change in relative vapor pressure of 0.15 results in a change in water adsorption amount of 0.18 g/g or larger.
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What is claimed is: 1. An adsorption heat pump which comprises (a) an adsorbate, (b) an adsorption/desorption part having an adsorbent for adsorbate adsorption/desorption, (c) a vaporization part for adsorbate vaporization which has been connected to the adsorption/desorption, part, and (d) a conde
What is claimed is: 1. An adsorption heat pump which comprises (a) an adsorbate, (b) an adsorption/desorption part having an adsorbent for adsorbate adsorption/desorption, (c) a vaporization part for adsorbate vaporization which has been connected to the adsorption/desorption, part, and (d) a condensation part for adsorbate condensation which has been connected to the adsorption/desorption part, wherein (1) the adsorbent comprises a zeolite containing aluminum and phosphorus in the framework structure, and (2) the adsorbent is a water vapor adsorbent having a region in which the adsorption amount difference as determined with the following equation is 0.15 g/g or larger in the range in which the relative vapor pressure φ2b during adsorption operation in the adsorption/desorption part is from 0.115 to 0.18 and the relative vapor pressure φ1b during desorption operation in the adsorption/desorption part is from 0.1 to 0.14: description="In-line Formulae" end="lead"Adsorption amount difference=Q2-Q1description="In-line Formulae" end="tail" wherein Q1=adsorption amount at φ1b as determined from a water vapor desorption isotherm obtained at a temperature (T3) used for desorption operation in the adsorption/desorption part Q2=adsorption amount at φ2b as determined from a water vapor adsorption isotherm obtained at a temperature (T4) used for adsorption operation in the adsorption/desorption part, provided that φ1b (relative vapor pressure during desorption operation in the adsorption/desorption part)=[equilibrium water vapor pressure at the temperature of coolant (T2) cooling the condenser]/[equilibrium water vapor pressure at the temperature of heat medium (T1) heating the adsorption/desorption part] φ2b (relative vapor pressure during adsorption operation in the adsorption/desorption part)=[equilibrium vapor pressure at the temperature of cold (T0) generated in the vaporization part]/[equilibrium vapor pressure at the temperature of coolant (T2) cooling the adsorption/desorption part] (wherein T0=5 to 10�� C., T1=T3=90�� C., and T2=T4=40 to 45�� C.). 2. The adsorption heat pump as claimed in claim 1, wherein T0 is 10�� C. and T2 is 40�� C. 3. The adsorption heat pump as claimed in claim 1, wherein T0 is 5�� C. and T2 is 40�� C. 4. The adsorption heat pump as claimed in claim 1, wherein T0 is 10�� C. and T2 is 45�� C. 5. The adsorption heat pump as claimed in claim 1, wherein the adsorbent has a region in which the adsorption amount difference is 0.15 g/g or larger in the range in which φ1b and φ2b are from 0.115 to 0.18 and φ1b is equal to or higher than φ2b. 6. The adsorption heat pump as claimed in claim 1, wherein the zeolite comprises a heteroatom in the framework structure. 7. The adsorption heat pump as claimed in claim 6, wherein the proportions of aluminum, phosphorus, and the heteroatom present in the zeolite are as follows: description="In-line Formulae" end="lead"0.001≦x≦0.3description="In-line Formulae" end="tail" (x=molar proportion of the heteroatom in the framework structure to the sum of aluminum, phosphorus, and the heteroatom in the framework structure); description="In-line Formulae" end="lead"0.3≦y≦0.6description="In-line Formulae" end="tail" (y=molar proportion of aluminum in the framework structure to the sum of aluminum, phosphorus, and the heteroatom in the framework structure); description="In-line Formulae" end="lead"0.3≦z≦0.6description="In-line Formulae" end="tail" (z molar proportion of phosphorus in the framework structure to the sum of aluminum, phosphorus, and the heteroatom in the framework structure). 8. The adsorption heat pump as claimed claim 1, wherein the zeolite is a zeolite having a framework density of from 10.0 T/1,000 Å3 to 16.0 T/1,000 Å3. 9. An air conditioning system for vehicles which employs the adsorption heat pump as claimed in claim 1. 10. The adsorption heat pump of claim 1, wherein the vaporization part cools an air stream. 11. The adsorption heat pump of claim 1, wherein the vaporization part is a cooling source. 12. The adsorption heat pump of claim 1, wherein the vaporization part generates cold. 13. A method for using an absorbent which comprises heating the adsorbent having an adsorbate to desorb the adsorbate, cooling the adsorbent dried to a temperature to be used for adsorbate adsorption, and again adsorbing the adsorbate, wherein (1) the adsorbent comprises a zeolite containing aluminum and phosphorus in the framework structure, and (2) the adsorbent is a water vapor adsorbent having a region in which the adsorption amount difference as determined with the following equation is 0.15 g/g or larger in the range in which the relative vapor pressure φ2b during adsorption operation in the adsorptionldesorption part is from 0.115 to 0.18 and the relative vapor pressure φ1b during desorption operation in the adsorptionldesorption part is from 0.1 to 0.14: Adsorption amount difference =Q2-Qi wherein Q1=adsorption amount at φ1b as determined from a water vapor desorption isotherm obtained at a temperature (T3) used for desorption operation in the adsorption/desorption part, and Q2=adsorption amount at φ2b as determined from a water vapor adsorption isotherm obtained at a temperature (T4) used for adsorption operation in the adsorption/desorption part, provided that φ1b (relative vapor pressure during desorption operation in the adsorption/desorption part)=[equilibrium water vapor pressure at the temperature of coolant (T2) cooling the condenser]/[equilibrium water vapor pressure at the temperature of heat medium (Ti) heating the adsorptionldesorption part], and φ2b (relative vapor pressure during adsorption operation in the adsorption/desorption part)=[equilibrium vapor pressure at the temperature of cold (T0) generated in the vaporization part]/[equilibrium vapor pressure at the temperature of coolant (T2) cooling the adsorption/desorption part](wherein T0=5 to 10�� C., T1=T3=90�� C., and T2=T4=40 to 45�� C.). 14. The method for using an absorbent as claimed in claim 13, wherein T0 is 10�� C. and T2 is 40�� C. 15. The method for using an absorbent as claimed in claim 13, wherein T0 is 5�� C. and T2 is 40�� C. 16. The method for using an absorbent as claimed in claim 13, wherein T0 is 10�� C. and T2 is 45�� C. 17. The method for using an absorbent as claimed in claim 13, wherein the adsorbent has a region in which the adsorption amount difference is 0.15 g/g or larger in the range in which φ1b and 2b are from 0.115 to 0.18 and φ1b is equal to or higher than φ2b. 18. The method for using an absorbent as claimed in claim 13, wherein the zeolite comprises a heteroatom in the framework structure. 19. The method for using an absorbent as claimed in claim 18, wherein the proportions of aluminum, phosphorus, and the heteroatom present in the zeolite are as follows: description="In-line Formulae" end="lead"0.001≦��≦0.3description="In-line Formulae" end="tail" (x=molar proportion of the heteroatom in the framework structure to the sum of aluminum, phosphorus, and the heteroatom in the framework structure); description="In-line Formulae" end="lead"0.3≦y≦0.6description="In-line Formulae" end="tail" (y=molar proportion of aluminum in the framework structure to the sum of aluminum, phosphorus, and the heteroatom in the framework structure); description="In-line Formulae" end="lead"0.3≦z≦0.6description="In-line Formulae" end="tail" (z=molar proportion of phosphorus in the framework structure to the sum of aluminum, phosphorus, and the heteroatom in the framework structure). 20. The method for using an absorbent as claimed in claim 13, wherein the zeolite has a framework density of from 10.0T/1,000Å3 to 16.0 T/1,000 Å3. 21. The adsorption heat pump of claim 13, wherein the vaporization part cools an air stream. 22. The adsorption heat pump of claim 13, wherein the vaporization part is a cooling source. 23. The adsorption heat pump of claim 13, wherein the vaporization part generates cold.
Wilson Stephen T. (Shrub Oak NY) Lok Brent M. (New York NY) Flanigen Edith M. (White Plains NY), Catalytic uses of crystalline metallophosphate compositions.
Lok Brent M. (New City NY) Messina Celeste A. (Ossining NY) Patton Robert L. (Katonah NY) Gajek Richard T. (New Fairfield CT) Cannan Thomas R. (Valley Cottage NY) Flanigen Edith M. (White Plains NY), Crystalline silicoaluminophosphates.
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