Claims:We claim,
1. A water harvesting system (100) is characterized by
a. At least one heating subsystem (200) wherein heat (300) is supplied from at least one radiative cooling subsystem (400).

2. The water harvesting system (100) as claimed in claim 1 is further characterized by
a. At least one container (500) capable of holding one or more chemical substances (600).

3. The water harvesting system (100) as claimed in claim 1 is further characterized by
a. At least one wave guide structure (700) which directs the heat (300) supplied from one or more radiative cooling subsystems (400) towards one or more containers (500).

4. The water harvesting system (100) as claimed in claim 1 is further characterized by
a. A temperature transmission subsystem (800) comprising plurality of temperature measurement devices (850) operably coupled with the water harvesting system (100).

5. The water harvesting system (100) as claimed in claim 1 is further characterized by
a. At least one controller (900) operably coupled with one or more wave guide structures (700) and the temperature transmission subsystem (800) to control the amount of heat (300) supplied from one or more radiative cooling subsystems (400).

6. The water harvesting system (100) as claimed in claim 1 is further characterized by
a. At least one water collection unit (950) to collect the water generated from the water harvesting system (100) and one or more radiative cooling subsystems (400).

7. The water harvesting system (100) as claimed in claim 2, wherein one of the chemical substances (600) is a MOF (metal organic framework) (610) or a zeolite (620) or any such chemical substance (630) capable of being used in the water harvesting system (100) for generating water by absorbing water in the atmosphere.

8. The water harvesting system (100) as claimed in any of the claims above wherein the heat required for releasing water (350) from the chemical substances (600) is supplied by any heating subsystems (250) such solar heater (260) addition to the heating subsystem (200).

9. The water harvesting system (100) as claimed in claim 3, wherein the wave guide structure (700) is modified to a suitable mechanical form including tapered form (710).

10. The water harvesting system (100) as claimed in claim 3, wherein the wave guide structure (700) is modified suitably for thermal emission beam control (720).

11. The water harvesting system (100) as claimed in claim 5, wherein the controller (900) operably coupled with the wave guide structure (700) for thermal emission beam control (720) such that required amount of heat (350) is supplied to one or more containers (500) holding the chemical substances (600) is controlled automatically considering the input factors such as external parameters such as solar irradiance (360) and internal parameters (370) of the chemical substances (600).
12. The water harvesting system (100) as claimed in claim 9, wherein the controller (900) operably coupled with the wave guide structure (700) for thermal emission beam control (720) such that required amount of heat is supplied to one or more container (500) holding the chemical substances (600) is controlled optimally using a machine learning algorithm (950) considering the input factors such as external parameters such as solar irradiance (360) and internal parameters such as the chemical substances (600).

13. A method of harvesting water (1000) using the water harvesting system ( 100) comprising the steps of:
a. Choosing (1100) the chemical substances (600) in one or more containers (500) and amount of the chemical substances (600) required for generating water of desired quantity;
b. Determining (1200) the amount of heat (350) required for releasing water from the chemical substances (600) contained in one or more container (500);
c. Arranging (1300) one or more radiative cooling subsystems (400) depending upon the amount of heat (350) required for releasing water from the chemical substances (600) contained in one or more containers (500);
d. Channelizing (1400) the heat (300) from one or more radiative cooling subsystems (400) using one or more wave guide structure (700) towards one or more containers (500), and
e. Collecting (1600) water from one or more water collection units (950).

14. The method of harvesting water (1000) as claimed in claim 13 using the water harvesting system (100) further comprising:
a. controlling (1500) the heat (300) from one or more radiative cooling subsystems (400) using one or more wave guide structure (700) towards one or more containers (500) using one or more controller (900).
15. The method of harvesting water (1000) as claimed in claim 13 using the water harvesting system (100) further comprising:
a. controlling (1510) the heat (300) from one or more radiative cooling subsystems (400) using one or more wave guide structure (700) towards one or more containers (500) using one or more controller (900) based on the temperature measurements from temperature transmission subsystem (800).

16. The method of harvesting water (1000) as claimed in claim 13 using the water harvesting system (100) further comprising:
a. controlling (1520) the heat (300) from one or more radiative cooling subsystems (400) using one or more wave guide structure (700) towards one or more containers (500) using one or more controller (900) based on the temperature measurements from temperature transmission subsystem (800) and considering the input factors such as external parameters such as solar irradiance (360) and internal parameters such as the chemical substances (600).

17. The method of harvesting water (1000) as claimed in claim 13 using the water harvesting system (100) further comprising:
a. controlling (1530) the heat (300) from one or more radiative cooling subsystems (400) using one or more wave guide structure (700) towards one or more containers (500) using one or more controller (900) automatically using machine learning algorithm based on the temperature measurements from temperature transmission subsystem (800) and considering the input factors such as external parameters such as solar irradiance (360) and internal parameters such as the chemical substances (600) along with the historical data from operating the water harvesting system (100).

18. The method of harvesting water (1000) as claimed in claim 13 using the water harvesting system (100) further comprising:
a. Channelizing a part of the heat (300) from one or more radiative cooling subsystems (400) using one or more wave guide structure (700) towards the one or more water collection units (950).

19. The method of harvesting water (1000) as claimed in claim 13 using the water harvesting system (100) further comprising:
a. Channelizing (1410) a part of the heat (300) from one or more radiative cooling subsystems (400) using one or more wave guide structure (700) towards the one or more water collection units (950) using one or more controllers (900) optimally.

20. The method of harvesting water (1000) as claimed in claim 13 using the water harvesting system (100) further comprising:
a. Supplying (1700) the heat (350) or heat channelized towards the one or more water collection units (950) by any heating subsystems such solar heater (250) addition to the heating subsystem (200).
, Description:PREAMBLE TO THE DESCRIPTION:
[0001] The following specification particularly describes the invention and the manner in which it is to be performed:

DESCRIPTION OF THE INVENTION
TECHNICAL FIELD OF THE INVENTION
[0002] The present invention is related to a system and method for harvesting water from atmosphere coupled with MOF (Metal organic framework) based and radiative cooling based subsystems by channelizing the heat from radiative cooling for heating MOF.

BACKGROUND OF THE INVENTION
[0003] According to USA geological survey, the study reveals that there is approximately 12900 billion cubic meters (one cubic meter is 1000 liters of water) of water in the atmosphere. It is obvious to harvest water from the atmosphere. There have been two major techniques namely MOF (metal organic framework) based water harvesting system and radiative cooling based water harvesting system. It is known that MOF based system needs heating to release the water absorbed and the radiative cooling system reflects heat back into atmosphere.
[0004] According to the invention described in US20190234053, the invention relates to Sorption-based Atmospheric Water Harvesting Device. The water-harvesting system described in the invention can operate with a material that can take up and release water with minimum energy requirements and powered by low-grade energy sources, such as sunlight, in order to potentially allow its deployment into households, especially those located in sunny regions. The water-harvesting method and system can include vapor adsorption using a porous metal-organic framework (MOF). In certain embodiments, the porous metal-organic framework can include metal-organic framework in ambient air with low relative humidity, typical of the levels found in most dry regions of the world. However, the system needs energy to heat anyway and they have used also sunlight. The invention does not use radiative cooling.
[0005] According to one other invention described in US20050044862A1, the invention discloses an autonomous water source (AWS) for extracting water from ambient air and delivering it to a plant to support growth. The system is based on an adsorption-desorption-condensation (ADC) cycle using a sorption material to extract moisture from ambient air and condensing the water vapor driven off from the sorption material by subsequent heating and followed by condensation. Liquid condensate produced in this process on the condenser is collected and delivered by gravity to a plant to reduce thermal stress and to support growth. The invention provides a sustainable source of irrigation water for agriculture and forestry, including areas where no water resources exist or are not economically viable. It can be tailored in size, and therefore, output capacity, reflecting the desired water requirements of a particular application, and can be used to replace most agricultural situations now reliant on surface water drip feed systems. The device is simple, rugged, invulnerable to rain, snow, and freezing conditions, and can be designed to last for many years without service as there are few moving parts and power required for operation is provided by sunlight. This invention uses an adsorption-desorption-condensation cycle and not radiative cooling.
[0006] According to yet another invention described in WO2016205717A1, the invention relates to systems and methods for radiative cooling and heating are provided. For example, systems for radiative cooling can include a top layer including one or more polymers, where the top layer has high emissivity in at least a portion of the thermal spectrum and an electromagnetic extinction coefficient of approximately zero, absorptivity of approximately zero, and high transmittance in at least a portion of the solar spectrum, and further include a reflective layer including one or more metals, where the reflective layer has high reflectivity in at least a portion of the solar spectrum. The water harvesting is not considered as the application.
[0007] Accordingly, there is a need for a system and method for harvesting water from atmosphere coupled with MOF (Metal organic framework) based and radiative cooling based subsystems by channelizing the heat from radiative cooling for heating MOF. The double advantage is that the water is generated from both MOF subsystem and radiative cooling based subsystem and the heat reflected from the radiative cooling is used for heating the MOF for harvesting water from atmosphere.

SUMMARY OF THE INVENTION:
[0008] It is an object of the invention to harvest water from atmosphere combined with MOF (Metal organic framework) based and radiative cooling based subsystems by channelizing the heat from radiative cooling for heating MOF using wave guide structures.

[0009] In one of the embodiments of the invention, using different chemical substances such as MOFs and Zeolites and any such chemical substance capable of being used in the water harvesting system for generating water by absorbing water in the atmosphere.

[0010] In another embodiment of the invention, the radiative heat can be further channelized towards the water collecting unit for keeping the water warm by diverting some of the heat is such a manner using wave guide structures.
[0011] One of the methods of the invention includes steps to choose the chemical substances in one or more containers and amount required for generating water, determine the amount of heat required for releasing water from the chemical substances contained in one or more containers, arrange one or more radiative cooling subsystems depending upon the amount of heat required for releasing water from the chemical substances, channelize the heat from one or more radiative cooling subsystems using one or more wave guide structure towards one or more containers and collecting the water.

[0012] In yet another method of harvesting water in the invention, in addition to the above, various ways of controlling the heat from one or more radiative cooling subsystems using one or more wave guide structure towards one or more containers using one or more controller are included before collecting the water.

BRIEF DESCRIPTION OF THE DRAWINGS:
[0013] As the figures are only for the illustrating purpose and not to be construed as limiting cases of the invention or implementation of the invention. It should be remembered that for appropriate variants of the embodiments corresponding to different independent claims figures have been provided accordingly.
[0014] Fig.1 describes an overview of water harvesting system with the heat from radiative cooling subsystem.
[0015] Fig.2 explains one of the embodiments of system of the invention as an extended water harvesting system with the heat from radiative cooling subsystem with container holding chemical substance.
[0016] Fig.3 narrates another embodiment of water harvesting system with the heat from radiative cooling subsystem with wave guide structure channelizing the heat to container holding chemical substance.
[0017] Fig.4 portraits the another embodiment of water harvesting system with the heat from radiative cooling subsystem with wave guide structure channelizing the heat to container holding chemical substance along with a temperature measurement subsystem.
[0018] Fig.5. explains an extended overview of water harvesting system with the controlled heat from radiative cooling subsystem with wave guide structure channelizing the heat to container holding chemical substance along with a temperature measurement subsystem.
[0019] Fig.6. corresponds to a further extended overview of water harvesting system with the controlled heat from radiative cooling subsystem with wave guide structure channelizing the heat to container holding chemical substance along with a temperature transmission subsystem along with water collection.
[0020] Fig.7. corresponds to a fully extended embodiment of water harvesting system with the controlled heat from radiative cooling subsystem with wave guide structure channelizing the heat to container holding chemical substance along with a temperature transmission subsystem along with water collection and alternate heating subsystem such as solar heater.
[0021] Fig.8 corresponds to the choices of the chemical substances capable of absorbing water in the atmosphere.
[0022] Fig. 9 explains the choices of the wave guide structure capable of channelizing heat.
[0023] Fig. 10 deals with a sample controller to control the channelization of wave guide structure to control heat required for heating the MOF for releasing the water.
[0024] Fig. 11 explains Choices of the wave guide structure capable of channelizing heat required for heating the MOF for releasing the water.
[0025] Fig.12 corresponds to a method for harvesting water using MOF and radiative cooling for the system mentioned in Fig.1. and their extensions.
[0026] Fig. 13 deals with an extended method for harvesting water using MOF and radiative cooling with controlled heating for the system mentioned in Fig.1. and their extensions.

DETAILED DESCRIPTION OF THE INVENTION:
[0027] Fig.1 describes an overview of water harvesting system (100) with the heat (300) from radiative cooling subsystem (400). The water harvesting system (100) is basically a chemical substance (600) based atmospheric water absorbing system which is well known in the field. Such systems for desorbing or releasing the water absorbed, need heating. Usually, the heat is provided using customary methods includes heating using renewable energies such as solar energy. It is also well known that the radiative cooling system also generates water from the atmosphere in addition to reflecting heat back into atmosphere. The core of the invention is that such heat (300) reflected into the atmosphere by the radiative cooling system (400) forms a heating subsystem (200) used for heating the chemical substance (600).
[0028] Fig.2 explains the embodiment of the water harvesting system (100) of the invention with the heat (300) from radiative cooling subsystem (400). The chemical substance (600) is kept in container (500). It may be recalled for obtaining more water, at least one container (500) or more amount of the chemical substance (600) can be used. The chemical substance (600) used is capable of harvesting water in the atmosphere.
[0029] Fig.3 narrates the embodiment of water harvesting system (100) with the heat (300) from radiative cooling subsystem (400) considering the core of the invention namely the redirection or guiding heat towards the required surface/area. One of the structures used for channelizing heat is wave guide structure (700). The wave guide structure (700) channelizes the heat (300) from the radiative cooling subsystem (400) to the container (500) holding chemical substance (600) capable of harvesting water in the atmosphere. Thus, the container (500) holding chemical substance (600) capable of harvesting water in the atmosphere is heated to desorb or release the water absorbed earlier.
[0030] Fig.4 portraits yet another embodiment of water harvesting system (100) with the heat (300) from the radiative cooling subsystem (400) with the wave guide structure (700) channelizing the heat (300) to the container (500) holding chemical substance (600). In this embodiment, a temperature transmission subsystem (800) comprising plurality of temperature measurement devices (850) is operably coupled with the water harvesting system (100). The temperature measurement devices (850) includes thermometer, thermocouple, thermopile and such devices capable of measuring suitable temperature range required for absorbing and desorbing water in the atmosphere along with the external temperature. One of the temperature measurement devices (850) is placed closer to the container (500) holding chemical substance (600) capable of harvesting water in the atmosphere.
[0031] Fig.5. explains an extended overview of water harvesting system (100) with the heat (300) from the radiative cooling subsystem (400) is controlled by a controller (900) which controls the wave guide structure channelizing adequate the heat (300) to the container (500) holding chemical substance (600). The controller (900) receives the temperature value from the temperature measurement devices (850) through the temperature transmission subsystem (800). Depending upon the temperature value received from the temperature transmission subsystem (800) and the known temperature at which the chemical substance (600) desorb or release the water absorbed earlier, amount of heat required for heating can be changed by the controller (900) using the wave guide structure (700) by channelizing adequate amount of heat required desorbing or releasing the water absorbed earlier by the chemical substance (600). It may be recalled to cut off heating the controller (900) will enforce the wave guide structure (700) to channelize the heat (300) towards atmosphere.
[0032] Fig.6. corresponds to a further extended overview of water harvesting system (100) with the heat (300) from the radiative cooling subsystem (400) is controlled by a controller (900) which controls the wave guide structure channelizing adequate the heat (300) to the container (500) holding chemical substance (600) along with the temperature transmission subsystem (800) to collect water in one or more water collection units (950). As both chemical substance (600) based water harvesting system (100) and the radiative cooling subsystem (400) harvest water, the water is collected in the water collection units (950).The twin advantage of heating the chemical substance (600) based water harvesting system (100) using the heat reflected by the radiative cooling subsystem (400) and also harvesting the water from both the systems is the core of the invention. This is made possible by the appropriate use of the wave guide structure (700) to channelize the heat (300) in a controlled manner using a controller (900) towards the container (500) holding chemical substance (600) capable of harvesting water in the atmosphere.
[0033] Fig.7. corresponds to a fully extended embodiment of water harvesting system (100) with the heat (300) from the radiative cooling subsystem (400) controlled by the controller (900). The controller (900) enforces the wave guide structure (700) channelizing the heat (300) towards the container (500) holding chemical substance (600). Upon heating the container (500) holding the chemical substance (600), the chemical substance (600) desorbs or releases the water absorbed earlier which is collected at one or more water collection units (950). The situation may so happen that adequate heat (300) from the radiative cooling subsystem (400) through the wave guide structure (700) is not possible due to various reasons including cloudy day or rainy day, alternate heating subsystem such as solar heater (260) can be used. This is basically a fall back option for continuous operation of water harvesting system (100).
[0034] Fig.8 corresponds to the choices of the chemical substances (600) capable of absorbing water in the atmosphere. The choices of the chemical substances (600) capable of absorbing water in the atmosphere include MOF (metal organic frame work) (610), zeolites (620) and any chemical substance (630) capable of being used in the water harvesting system (100) for generating water by absorbing water in the atmosphere.
[0035] Fig. 9 mentions the choices of the wave guide structure (700) capable of channelizing heat (300) from the radiative cooling subsystem (400) include suitable mechanical form including tapered form (710) and suitable form for thermal emission beam control (720). The wave guide structure (700) is also controlled by the controller (900) to modify the amount of heat channelized towards the container (500) holding chemical substance (600) to desorb or release the water absorbed earlier.
[0036] Fig. 10 deals with a sample controller (900) to control the channelization of wave guide structure (700) to control heat (300) from the radiative cooling subsystem (400) for heating the chemical substance (600) capable of being used in the water harvesting system (100) for releasing the water. The controller (900) considers the temperature values from the temperature transmission subsystem (800), the solar irradiance (360) and the internal parameters (370) of the chemical substances (600) capable of harvesting water in the atmosphere. It may be recalled that it is only a sample set of control parameters for the controller (900). Any relevant other such parameters are also considered as control parameters for the controller (900).
[0037] Fig. 11 explains the controller (900) using a machine learning algorithm (950). From the historical data comprising the temperature values from the temperature transmission subsystem (800), the solar irradiance (360), the heat (300) and the internal parameters (370) of the chemical substances (600) capable of harvesting water in the atmosphere, the machine learning algorithm learns to control the controller (900) so that adequate amount heat (300) is channelized through the wave guide structure (700).
[0038] Fig.12 corresponds to a method (1000) for harvesting water using the chemical substance (600) and radiative cooling subsystem (400) for the water harvesting system (100) mentioned in Fig.1 along with their extensions. The steps include choosing (1100) chemical substances (600) in containers (500) and amount of chemical substances (600) required for generating water of desired quantity, determining (1200) amount of heat (350) required for releasing water from chemical substances (600) contained in container (500), arranging (1300) radiative cooling subsystems (400) depending upon amount of heat (350) required for releasing water from chemical substances (600) contained containers (500), channelizing (1400) heat (300) from radiative cooling subsystems (400) using wave guide structure (700) towards containers (500) and collecting (1600) water from water collection units (950).
[0039] Fig. 13 deals with an extension to the method (1000) for harvesting water using the chemical substance (600) and radiative cooling subsystem (400) with controlled heating (300) for the water harvesting system (100) mentioned in Fig.1. along with their extensions. The steps are same as the above excepting controlling (1500) heat (300) from radiative cooling subsystems (400) using wave guide structure (700) towards containers (500) using controller (900) is added before collecting (1600) water from water collection units (950). In other embodiments, the control strategy such as controlling (1500) can be further extended based on the temperature measurements from temperature transmission subsystem (800) as controlling (1510), the temperature measurements from temperature transmission subsystem (800) and considering the input factors such as external parameters such as solar irradiance (360) and internal parameters such as the chemical substances (600) as controlling (1520) and the temperature measurements from temperature transmission subsystem (800) and considering the input factors such as external parameters such as solar irradiance (360) and internal parameters such as the chemical substances (600) along with the historical data from operating the water harvesting system (100).
[0040] The method of harvesting water (1000) using the water harvesting system (100) also includes channelizing a part of the heat (300) from one or more radiative cooling subsystems (400) using one or more wave guide structure (700) towards the one or more water collection units (950). This is done not only to warm the water collected but also not wasting heat energy. Additionally, the channelizing (1410) a part of the heat (300) from one or more radiative cooling subsystems (400) using one or more wave guide structure (700) towards the one or more water collection units (950) using one or 5 more controllers (900) optimally forms another embodiment. The method of harvesting water (1000) using the water harvesting system (100) also includes supplying (1700) the heat (350) or heat channelized towards the one or more water collection units (950) by any heating subsystems such solar heater (250) addition to the heating subsystem (200). This embodiment is to compensate the heat requirement of operating the system (1000).
[0041] For the sake of better understanding of the invention, two example scenarios have been mentioned. It should not be construed that the claimed invention of the patent application works only in these scenarios or restricted to the scenarios mentioned in the examples.
Example 1:
[0042] The water harvesting system (100) uses the following steps to harvest water from the atmosphere. By choosing (1100) chemical substances (600) in containers (500) and amount of chemical substances (600) required for generating water of desired quantity, determining (1200) amount of heat (350) required for releasing water from chemical substances (600) contained in container (500) is computed. By arranging (1300) radiative cooling subsystems (400) depending upon amount of heat (350) required for releasing water from chemical substances (600) contained containers (500), it is also possible to fix the number of such units required. Then, by channelizing (1400) heat (300) from radiative cooling subsystems (400) using wave guide structure (700) towards containers (500), chemical substances (600) contained containers (500) starts getting heated and begins to desorb or release the water absorbed earlier which is getting water collected (1600) in water collection units (950).
Example 2:
[0043] The main difference between examples 1 and 2 is that in addition to above mentioned in example 1, further controlling (1500) heat (300) from radiative cooling subsystems (400) using wave guide structure (700) towards containers (500) using controller (900) is added before collecting (1600) water from water collection units (950). Because of the controlled heating, better performance of harvesting water can be achieved.

Example 3:
[0042] The main difference between example 3 and the examples 1 and 2 is that in addition to above mentioned example 1 and 2, the additional source of heating includes solar heater (260). Apart from this, the heat (300) channelized by the wave guide structure (700) can also be channelized to keep the water collected in the water collection unit (950) warm.