Water droplet generating system and method for generating water droplet

1. A water droplet generating system comprising:

a vessel, which is placed in an atmosphere, and which has an opening portion;

a first opening/closing valve, which opens the opening portion when an ambient temperature is lower than a predetermined temperature or when humidity is higher than a predetermined humidity, the first opening/closing valve closing the opening portion when the ambient temperature is higher than the predetermined temperature or when the humidity is lower than the predetermined humidity;

a moisture absorbent member, housed in the vessel, the moisture absorbent material constructed to absorb and release water vapor depending on a change of humidity; and

a condenser portion disposed to communicate with an inside of the vessel, the condenser portion being constructed to cool the water vapor, which is released form the moisture absorbent member, to a dew point of the water vapor or less; wherein:

when the first opening/closing valve opens the opening portion, the moisture absorbent member absorbs water vapor in the atmosphere,

when the first opening/closing valve closes the opening portion, the moisture absorbent member releases the water vapor, and the condenser portion condenses the water vapor, which is released from the moisture absorbent member, to generate a water droplet; and

the vessel and the condenser portion are connected by a connector that is constructed to permit the water vapor, which is released from the moisture absorbent member, to pass from the vessel to the condenser portion, the connector being made of a material having a heat conductivity lower than a heat conductivity of the vessel and lower than a heat conductivity of the condenser portion.

2. The water droplet generating system according to claim 1 , wherein the first opening/closing valve opens and closes the opening portion by using a wax, a volume of the wax changing depending on a change of temperature.

3. The water droplet generating system according to claim 1 , wherein the first opening/closing valve opens and closes the opening portion by using a motor powered by a solar battery.

4. The water droplet generating system according to claim 3 , further comprising means for switching ON and OFF of a power supply to the motor at a predetermined opening time, at which the ambient temperature rises in a day, and at a predetermined closing time, at which the ambient temperature falls in the day, wherein:

the first opening/closing valve is constructed to open at the predetermined opening time and to close at the predetermined closing time.

5. The water droplet generating system according to claim 1 , further comprising a water reservoir that stores the water droplet generated in the condenser portion.

6. The water droplet generating system according to claim 1 , further comprising:

an air introduction channel that communicates the condenser portion with the atmosphere,

a humidity sensor that detects humidity in a vicinity of the air introduction channel,

a pump that supplies the atmosphere, which is introduced through the air introduction channel, to the condenser portion,

a second opening/closing valve that opens and closes the air introduction channel, and

a controller portion that operates an opening/closing control of the second opening/closing valve and an activation of the pump; wherein:

when humidity detected by the humidity sensor exceeds a predetermined value, the controller portion opens the second opening/closing valve and activates the pump.

7. The water droplet generating system according to claim 1 , wherein the condenser portion is a heat exchanger, which is placed in soil, and which is constructed to perform heat exchange between the soil and the water vapor released from the moisture absorbent member.

8. The water droplet generating system according to claim 1 , wherein the condenser portion is a heat exchanger constructed to perform heat exchange between the atmosphere and the water vapor released from the moisture absorbent member.

9. The water droplet generating system according to claim 1 , wherein the condenser portion is a heat exchanger placed in water and constructed to perform heat exchange between the water and the water vapor released from the moisture absorbent member.

10. The water droplet generating system according to claim 1 , wherein the moisture absorbent member is made of mesoporous silica.

11. The water droplet generating system according to claim 10 , wherein the mesoporous silica has a pore size ranging from 1 nm to 7 nm.

12. The water droplet generating system according to claim 1 , further comprising a moisture transfer member that diffuses the water droplet, which is generated in the condenser portion, in soil.

13. The water droplet generating system according to claim 1 , wherein the vessel has an upper surface that is made of an upper-side member having translucency.

14. The water droplet generating system according to claim 13 , wherein the upper-side member includes two plate-like members that define a hermetically sealed space therebetween.

15. The water droplet generating system according to claim 1 , further comprising means for clarifying the water droplet generated in the condenser portion.

16. The water droplet generating system according to claim 1 , wherein the condenser portion is disposed outside of the vessel.

17. The water droplet generating system according to claim 1 , wherein the condenser portion is separate from the vessel.

18. The water droplet generating system according to claim 1 , wherein the water vapor which is released from the moisture absorbent material passes through the connector.