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A desiccant air conditioning system for treating an air stream entering a building space, including a conditioner configured to expose the air stream to a liquid desiccant such that the liquid desiccant dehumidifies the air stream in the warm weather operation mode and humidifies the air stream in t

A desiccant air conditioning system for treating an air stream entering a building space, including a conditioner configured to expose the air stream to a liquid desiccant such that the liquid desiccant dehumidifies the air stream in the warm weather operation mode and humidifies the air stream in the cold weather operation mode. The conditioner includes multiple plate structures arranged in a vertical orientation and spaced apart to permit the air stream to flow between the plate structures. Each plate structure includes a passage through which a heat transfer fluid can flow. Each plate structure also has at least one surface across which the liquid desiccant can flow. The system includes a regenerator connected to the conditioner for causing the liquid desiccant to desorb water in the warm weather operation mode and to absorb water in the cold weather operation mode from a return air stream.

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1. A desiccant air conditioning system for treating an air stream entering a building space, the desiccant air conditioning system being switchable between operating in a warm weather operation mode and in a cold weather operation mode, comprising: a conditioner configured to expose the air stream t

1. A desiccant air conditioning system for treating an air stream entering a building space, the desiccant air conditioning system being switchable between operating in a warm weather operation mode and in a cold weather operation mode, comprising: a conditioner configured to expose the air stream to a liquid desiccant such that the liquid desiccant dehumidifies the air stream in the warm weather operation mode and humidifies the air stream in the cold weather operation mode, the conditioner including a plurality of plate structures arranged in a vertical orientation and spaced apart to permit the air stream to flow between the plate structures, each plate structure including a passage through which a heat transfer fluid flows, each plate structure also having at least one surface across which the liquid desiccant flows;a regenerator connected to the conditioner for receiving the liquid desiccant from the conditioner, said regenerator causing the liquid desiccant to desorb water in the warm weather operation mode and to absorb water in the cold weather operation mode from a return air stream, the regenerator including a plurality of plate structures arranged in a vertical orientation and spaced apart to permit the return air stream to flow between the plate structures, each plate structure having an internal passage through which a heat transfer fluid flows, each plate structure also having an outer surface across which the liquid desiccant flows;a liquid desiccant loop for circulating the liquid desiccant between the conditioner and the regenerator;a heat source or cold source system for transferring heat to the heat transfer fluid used in the conditioner in the cold weather operation mode, for receiving heat from the heat transfer fluid used in the conditioner in the warm weather operation mode, for transferring heat to the heat transfer fluid used in the regenerator in the warm weather operation mode, or for receiving heat from the heat transfer fluid used in the regenerator in the cold weather operation mode;a conditioner heat transfer fluid loop for circulating heat transfer fluid through the conditioner and exchanging heat with the heat source or cold source system;a regenerator heat transfer fluid loop for circulating heat transfer fluid through the regenerator and exchanging heat with the heat source or cold source system; anda switch valve for selectively providing fluid communication from the regenerator heat transfer fluid loop to the conditioner heat transfer fluid loop and from the conditioner heat transfer fluid loop to the regenerator heat transfer fluid loop. 2. The system of claim 1, wherein the conditioner heat transfer fluid loop includes a bypass system for the heat transfer fluid in the conditioner to enable temperature control of the air stream entering the building. 3. The system of claim 1, wherein the regenerator heat transfer fluid loop includes a bypass system for the heat transfer fluid in the regenerator to enable desiccant concentration control to control humidity of the air stream entering the building. 4. The system of claim 1, further comprising a heat rejection system coupled to the regenerator heat transfer fluid loop for rejecting additional heat from the system to enable to control of the amount of heat released by the system through the regenerator. 5. The system of claim 1 further comprising a pump coupled to the conditioner heat transfer fluid loop for applying negative pressure to the conditioner for draining heat transfer fluid from the conditioner. 6. The system of claim 1, wherein the heat source or cold source system comprises a refrigerant compressor system for compressing a refrigerant flowing through a refrigerant loop, wherein heat is transferred between the refrigerant loop and the conditioner heat transfer fluid loop through a heat exchanger, and wherein heat is transferred between the refrigerant loop and the regenerator heat transfer fluid loop through another heat exchanger. 7. The system of claim 6, wherein the refrigerant compressor system is reversible for reversing flow through the refrigerant loop to switch between the cold weather and warm weather operation modes. 8. The system of claim 1, wherein the heat source or cold source system comprises a geothermal source, a cooling tower, an indirect evaporative cooler, a chilled water loop, a chilled brine loop, a steam loop, a solar water heater, a gas furnace, or a waste heat source. 9. The system of claim 1, further comprising: an indirect evaporative cooler; anda diverter for diverting a selected portion of the air stream that has flowed through the conditioner through the indirect evaporative cooler in the warm weather operation mode,wherein the evaporative cooler receives a water stream and heat transfer fluid from the conditioner heat transfer fluid loop and cools the heat transfer fluid by evaporating the water stream. 10. The system of claim 9, wherein the indirect evaporative cooler comprises a plurality of plate structures arranged in a vertical orientation and spaced apart to permit the diverted portion of the air stream to flow between the plate structures, each plate structure including a passage through which the heat transfer fluid flows, each plate structure having at least one surface across which the water stream to be evaporated flows. 11. The system of claim 10, wherein the indirect evaporative cooler further comprises a membrane positioned proximate the at least one surface of the plate structure between the water stream to be evaporated and the diverted portion of the air stream. 12. The system of claim 1, further comprising an evaporator for humidifying an air stream to be combined with the air stream exiting the conditioner in the cold weather operation mode, wherein said evaporator receives the water stream and heat transfer fluid from the conditioner for use in evaporating the water stream. 13. The system of claim 12, wherein the evaporator comprises a plurality of plate structures arranged in a vertical orientation and spaced apart to permit the air stream to flow between the plate structures, each plate structure including a passage through which the heat transfer fluid flows, each plate structure having at least one surface across which the water stream to be evaporated flows. 14. The system of claim 13, wherein the evaporator further comprises a membrane positioned proximate the at least one surface of the plate structure between the water stream to be evaporated and the air stream. 15. The system of claim 1, wherein the heat source or cold source system comprises a first refrigerant compressor for compressing a refrigerant flowing through a first refrigerant loop and a second refrigerant compressor for compressing a refrigerant flowing through a second refrigerant loop, wherein heat is transferred between the first refrigerant loop and the conditioner heat transfer fluid loop and heat is transferred between the second refrigerant loop and the conditioner heat transfer fluid loop through one or more heat exchangers in parallel, and wherein heat is transferred between the first refrigerant loop and the regenerator heat transfer fluid loop and heat is transferred between the second refrigerant loop and the regenerator heat transfer fluid loop through one or more additional heat exchangers in parallel. 16. The system of claim 1, wherein the heat source or cold source system comprises a first refrigerant compressor for compressing a refrigerant flowing through a first refrigerant loop and a second refrigerant compressor for compressing a refrigerant flowing through a second refrigerant loop, wherein heat is transferred between the conditioner heat transfer fluid loop and the first refrigerant loop through a first heat exchanger, wherein heat is transferred between the first refrigerant loop and the second refrigerant loop through a second heat exchanger, and wherein heat is transferred between the second refrigerant loop and the regenerator heat transfer fluid loop through a third heat exchanger. 17. The system of claim 1, wherein each of the plurality of plate structures in the conditioner and the regenerator include a separate collector for collecting liquid desiccant that has flowed across the plate structure.