Tank system for liquid desiccant air conditioning system
A liquid desiccant air conditioning system includes one or more liquid desiccant tanks.
1. A liquid desiccant air-conditioning system, comprising:
(a) a first liquid desiccant unit;
(b) a second liquid desiccant unit,
wherein one of said first and second liquid desiccant units is a conditioner and the other of said first and second liquid desiccant units is a regenerator;
(c) a stratified liquid desiccant tank; and
(d) a transfer system for transferring liquid desiccant among the first liquid desiccant unit, the second liquid desiccant unit, and the liquid desiccant tank, said transfer system comprising:
a first conduit coupled to the liquid desiccant tank and the first liquid desiccant unit for transferring liquid desiccant from a lower portion of the liquid desiccant tank to the first liquid desiccant unit;
a second conduit coupled to the first liquid desiccant unit and the second liquid desiccant unit for transferring liquid desiccant from the first liquid desiccant unit to the second liquid desiccant unit;
a third conduit coupled to the second liquid desiccant unit and the liquid desiccant tank for transferring liquid desiccant from the second liquid desiccant unit to the liquid desiccant tank;
a bypass valve in the second conduit;
a fourth conduit coupled the bypass valve and the liquid desiccant tank for transfer of liquid desiccant between the second conduit and the liquid desiccant tank; and
one or more pumps associated with at least one of the conduits for pumping liquid desiccant therethrough; and
(e) a heat exchanger coupled to two of said conduits for exchanging heat between the liquid desiccant flowing in one conduit and liquid desiccant flowing in the other conduit.
2. The system of claim 1 , wherein the first liquid desiccant unit is the conditioner, and the stratified liquid desiccant tank is located in a conditioned space.
3. The system of claim 2 , wherein the stratified liquid desiccant tank is located in a wet room that includes a water supply for adding water to the liquid desiccant.
4. The system of claim 1 , wherein the first liquid desiccant unit is the regenerator, and the stratified liquid desiccant tank is located outside a conditioned space.
5. The system of claim 1 , wherein the first liquid desiccant unit is the conditioner, which cools and dehumidifies an air stream provided to a building space when the air-conditioning unit is operated in a cooling and dehumidification mode, and wherein the second liquid desiccant unit comprises the regenerator, which humidifies and heats outside air, return air from the building space, or a combination thereof.
6. The system of claim 1 , wherein the first liquid desiccant unit is the conditioner, which heats and humidifies an air stream provided to a building space when the air-conditioning unit is operated in a heating and humidification mode, and wherein the second liquid desiccant unit comprises the regenerator, which dehumidifies and cools outside air, return air from the building space, or a combination thereof.
7. The system of claim 1 , wherein the bypass valve can be set to divert all of the liquid desiccant flowing in the second conduit to the liquid desiccant tank instead of the second liquid desiccant unit when the second liquid desiccant unit is inactivated.
8. The system of claim 1 , wherein the bypass valve can be set to block liquid desiccant from the first liquid desiccant unit and such that liquid desiccant can be drawn from the liquid desiccant tank into the second conduit for transfer to the second liquid desiccant unit when the first liquid desiccant unit is inactivated.
9. The system of claim 1 , wherein the heat exchanger is coupled to the first conduit and the second conduit to exchange heat between the liquid desiccant flowing into the first liquid desiccant unit and the liquid desiccant flowing out of the first liquid desiccant unit.
10. The system of claim 1 , wherein the heat exchanger is coupled to the second conduit and the third conduit to exchange heat between the liquid desiccant flowing into the second liquid desiccant unit and the liquid desiccant flowing out of the second liquid desiccant unit.
11. The system of claim 1 , wherein the liquid desiccant tank includes at least one sidewall that is angled or otherwise configured such that the upper end of the tank is wider than the lower end of the tank to provide a more linear relation between liquid desiccant concentration and level in the tank.