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1. WO2020117808 - SYSTÈMES DE CLIMATISATION À DÉSHYDRATANT LIQUIDE UTILISANT DES FLUIDES DE TRANSFERT DE CHALEUR SANS ANTIGEL

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. A liquid desiccant air-conditioning system for treating an air stream entering a building space, comprising:

a compressor-based cooling system through which a refrigerant flows;

a liquid desiccant conditioner utilizing a liquid desiccant and a heat transfer fluid to cool, heat, humidify, or dehumidify a first air stream flowing therethrough depending on a mode of operation of the liquid desiccant air conditioning system, wherein the heat transfer fluid used in the conditioner contains substantially no antifreeze additive;

a liquid desiccant regenerator receiving the liquid desiccant used in the liquid desiccant conditioner, and utilizing a heat transfer fluid and a second air stream flowing therethrough to concentrate or dilute the liquid desiccant depending on the mode of operation of the liquid desiccant air conditioning system, and then returning the liquid desiccant to the conditioner, wherein the heat transfer fluid and the liquid desiccant cool, heat, humidify, or dehumidify the second air stream depending on the mode of operation of the liquid desiccant air conditioning system, wherein the heat transfer fluid used in the regenerator contains substantially no antifreeze additive;

a first heat exchanger thermally coupled to the heat transfer fluid used in the liquid desiccant conditioner and to the refrigerant flowing through the compressor-based cooling system for exchanging heat between the refrigerant and the heat transfer fluid;

a second heat exchanger thermally coupled to the heat transfer fluid used in the liquid desiccant regenerator and to the refrigerant flowing through another portion of the compressor-based cooling system for exchanging heat between the refrigerant and the heat transfer fluid;

a first enclosure containing the liquid desiccant conditioner, the first enclosure including an inlet for receiving the first air stream and an outlet for outputting a supply air stream to the building space comprising the first air stream after treatment by the conditioner;

a second enclosure containing the liquid desiccant regenerator, said second enclosure including an inlet for receiving the second air stream and an outlet for exhausting the second air stream after treatment by the regenerator;

a third enclosure containing the compressor-based cooling system, the first heat exchanger, and the second heat exchanger;

one or more dampers between the first enclosure, the second enclosure, and the third enclosure selectively permitting flow of the supply air stream from the first enclosure to the second enclosure and the third enclosure during operation of the liquid desiccant air-conditioning system in a heating operation mode to prevent freezing of the heat transfer fluid; and

a heating system positioned in the first enclosure to heat the first air stream prior to the air stream entering the conditioner.

2. The system of claim 1, wherein space in the first enclosure is in fluid communication with the building space.

3. The system of claim 1, wherein the liquid desiccant conditioner includes a plurality of structures arranged in a substantially parallel orientation, each of the structures has at least one surface across which the liquid desiccant can flow and an internal passage through which the heat transfer fluid can flow, wherein the first air stream flows between the plurality of structures.

4. The system of claim 1 , wherein the liquid desiccant regenerator includes a plurality of structures arranged in a substantially parallel orientation, each of the structures has at least one surface across which the liquid desiccant can flow and an internal passage through which a heat transfer fluid can flow, wherein a second air stream flows between the plurality of structures.

5. The system of claim 1, further comprising a heating system in the second enclosure to heat the air or heat transfer fluid therein and obviate need for an advanced dehumidification coil.

6. The system of claim 5, wherein the heating system comprises a water heater to heat the heat transfer fluid or a space heater.

7. The system of claim 1, wherein one or more of the enclosures include a low point from which the heat transfer fluid can be drained.

8. The system of claim 1, wherein the compressor-based cooling system comprises a chiller.

9. A method of operating a liquid desiccant air-conditioning system for treating an air stream entering a building space, wherein the liquid desiccant air conditioning system includes:

a compressor-based cooling system through which a refrigerant flows;

a liquid desiccant conditioner utilizing a liquid desiccant and a heat transfer fluid to cool, heat, humidify, or dehumidify a first air stream flowing therethrough depending on the mode of operation of the liquid desiccant air conditioning system, wherein the heat transfer fluid used in the conditioner contains substantially no antifreeze additive;

a liquid desiccant regenerator receiving the liquid desiccant used in the liquid desiccant conditioner, and utilizing a heat transfer fluid and a second air stream flowing therethrough to concentrate or dilute the liquid desiccant depending on the mode of operation of the liquid desiccant air conditioning system, and then returning the liquid desiccant to the conditioner, wherein the heat transfer fluid and the liquid desiccant cool, heat, humidify, or dehumidify the second air stream depending on the mode of operation of the liquid desiccant air conditioning system, wherein the heat transfer fluid used in the regenerator contains substantially no antifreeze additive;

a first heat exchanger thermally coupled to the heat transfer fluid used in the liquid desiccant conditioner and to the refrigerant flowing through the compressor-based cooling system for exchanging heat between the refrigerant and the heat transfer fluid;

a second heat exchanger thermally coupled to the heat transfer fluid used in the liquid desiccant regenerator and to the refrigerant flowing through another portion of the compressor-based cooling system for exchanging heat between the refrigerant and the heat transfer fluid;

a first enclosure containing the liquid desiccant conditioner, the first enclosure including an inlet for receiving the first air stream and an outlet for outputting a supply air stream to the building space comprising the first air stream after treatment by the conditioner;

a second enclosure containing the liquid desiccant regenerator, said second enclosure including an inlet for receiving the second air stream and an outlet for exhausting the second air stream after treatment by the regenerator; and

a third enclosure containing the compressor-based cooling system, the first heat exchanger, and the second heat exchanger;

wherein the method comprises

heating the first air stream prior to the air stream entering the conditioner and selectively permitting flow of the supply air stream from the first enclosure to the second enclosure and the third enclosure during operation of the liquid desiccant air-conditioning system in a heating operation mode to prevent freezing of the heat transfer fluid.

10. The method of claim 9, wherein space in the first enclosure is in fluid communication with the building space.

11. The method of claim 9, further comprising heating the heat transfer fluid using a water heater.

12. The method of claim 9, further comprising heating space in the second enclosure or the third enclosure using one or more space heaters.

13. The method of claim 9, further comprising draining the heat transfer fluid from a low point in the liquid desiccant air conditioning system in the event of power failure.