WO2009045168A1 - System and method for extracting atmospheric water - Google Patents
System and method for extracting atmospheric water Download PDFInfo
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- WO2009045168A1 WO2009045168A1 PCT/SG2008/000260 SG2008000260W WO2009045168A1 WO 2009045168 A1 WO2009045168 A1 WO 2009045168A1 SG 2008000260 W SG2008000260 W SG 2008000260W WO 2009045168 A1 WO2009045168 A1 WO 2009045168A1
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- WIPO (PCT)
- Prior art keywords
- water
- liquid
- cooling
- water extraction
- air
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/05—Separating dispersed particles from gases, air or vapours by liquid as separating agent by condensation of the separating agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
- B01D5/0006—Coils or serpentines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0039—Recuperation of heat, e.g. use of heat pump(s), compression
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
- B01D53/323—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
Definitions
- the present field of invention generally relates to extraction of atmospheric water. More particularly, it relates to a system and a method for obtaining potable water from extracting atmospheric water.
- the earth consists mainly of water and water exists on the earth's surface, in aquifers in the soil as groundwater, and in the atmosphere as water vapour. Of all the water on earth, only less than 3 percent is fresh water. However, as majority of fresh water is trapped in ice caps, glaciers and aquifers, only less than 1 percent of the water supply on earth is portable and available for drinking purposes.
- potable water Besides having insufficient fresh water sources, there are also problems associated with provision of potable water.
- the provision of potable water is a serious problem in areas where rainfall is scarce, seasonal, or where there are relatively small water catchment areas and little natural local water storage. Additionally, as fresh water sources are not evenly distributed globally, some geographical locations do not have ready access to fresh water. Constructing reservoirs and water desalination plants usually alleviates this problem. However, many countries are unable to afford water desalination plants due to the relatively high capital investment and operational costs required.
- Another problem associated with the provision of potable water relates to the setting up and maintenance of potable water distribution networks, such as water piping networks, which require significant efforts and resources. Further, water piping networks have limited lifespan and are frequently associated with water leakage and contamination problems.
- Water piping networks typically use water pipes made from metal ducts, concrete ducts or polyvinyl chloride (PVC) pipes.
- Metal and concrete ducts are vulnerable to corrosion by inorganic acid and alkaline contaminants, whereas organic solvents present in soil and building materials can be absorbed by and permeated through PVC pipes.
- the cost of electricity needed for extracting an amount of water from the atmosphere can be lower than the price of a bottled water of equivalent volume, or that of the utility charge of obtaining an equivalent volume of water from the tap with the additional cost for boiling or purifying water using mechanical and chemical filtering means.
- the cost of hardware of a commercial water production system comprising compressor, condenser, evaporator and filtration means remains relatively high leading to unattractive return of investment.
- these commercial water production systems for water vapour extraction operate above 20 0 C and above a relative humidity of 35%.
- U.S. Pat. No. 3,675,442 to Swanson discloses an atmospheric water collector, which employs a cooling coil immersed in a fresh water bath that cools the bath.
- the cooled water is pumped through a conduit and condensing frame. Water vapour present in winds that pass over the condensing frame is condensed and drained into a collector.
- the cooled water is periodically mixed with the condensed water subjecting the condensed water to contamination.
- U.S. Pat. No. 5,056,593 to Hull discloses, in several variations, the use of electrostatic and magnetic fields to substantially enhance water product extraction yields in a dehumidifying heat exchanger apparatus.
- Liquid water droplets are electrostatically collected on grounded or charged heat transfer tubes in the heat exchanger apparatus.
- charged or grounded horizontally-declined heat transfer tubes with attached drainage wicks attract liquid droplets and accelerate condensing heat transfer by continuous absorption and transfer of condensate.
- the use of drainage wicks to absorb and confine condensate collected on the surfaces of the heat transfer tubes may result in the loss of water extracted and advance the growth of fungi and bacteria on the drainage wicks.
- the heat exchanger apparatus may be electrically unsafe with charged electrode wires entrenched between the tubes of the heat exchange unit.
- U.S. Pat. No. 7,000,410 to Hutchinson discloses a device that utilizes a condenser type refrigerant system with multiple fans and two air chambers to produce water from the air.
- the apparatus further deploys a stainless steel ioniser to charge the ambient air to maximise extraction of moisture from the air.
- the two air chambers operate in tandem to mix desiccated ionised air that exited from the evaporator plates with fresh incoming air drawn through a compressor, a condenser and the ioniser. This causes partial drying of the newly formed condensation, which results in loss of condensation leading to reduced output and efficiency.
- JP Pat. No. 02,172,587 to Katsumi and U.S. Pat. No. 5,435,151 to Han disclose water making apparatus for use on vehicles.
- U.S. Pat. App. No. 20040040322 filed by Engel et al. discloses a similar water extraction device for vehicles, together with some applications including central air system and mobile unit. All the disclosed devices tap on existing or external air conditioning systems to simplify system design and lower device cost. However, conventional designs fail to function properly in many temperate areas where ambient temperature drops below 2O 0 C during the night or during cold spells and storms. This problem accentuates for water extraction devices installed on vessels and ships, on caravans and emergency vehicles.
- the present embodiment of the invention disclosed herein provides an atmospheric water extraction system and a method for extracting atmospheric water for obtaining potable water.
- an atmospheric water extraction system comprising a passage, a cooling unit and an ioniser.
- the passage comprises a condenser portion and a cooling portion inter-configured for cyclical passage of fluid therethrough.
- the cooling unit is in thermal communication with the cooling portion and is for extracting heat from liquid passaging through the cooling portion to thereby cool the liquid, in which the liquid is transportable to the condenser portion subsequent to passaging through the cooling portion.
- the ioniser is for ionising ambient air into ionised air, in which the ionised air is charged for enhancing adhesion of water vapour thereto.
- the ionised air is transportable for thermal interaction with the condenser portion of the passage for condensing the water vapour into water droplets, and the liquid passaging through the condenser portion receives heat from the ionised air during thermal interaction of the ionised air with the condenser portion.
- the liquid is then transportable to the cooling portion of the passage for re-cooling thereby subsequent to passaging through the condenser portion.
- an atmospheric water extraction method comprising providing a passage having a condenser portion and a cooling portion inter-configured for cyclical passage of fluid therethrough.
- the method also comprises extracting heat from liquid passaging through a cooling portion to thereby cool the liquid using a cooling unit, whereby the cooling unit is in thermal communication with the cooling portion.
- the liquid is then transportable to the condenser portion subsequent to passaging through the cooling portion.
- the method further comprises ionising ambient air into ionised air using an ioniser, in which the ionised air is charged for enhancing adhesion of water vapour thereto.
- the ionised air is transportable for thermal interaction with the condenser portion of the passage for condensing the water vapour into water droplets, and the liquid passaging through the condenser receives heat from the ionised air during thermal interaction of the ionised air with the condenser portion.
- the liquid is then transportable to the cooling portion of the passage for re-cooling thereby subsequent to passaging through the condenser portion.
- an atmospheric water extraction system comprising an ioniser and a condenser portion.
- the ioniser ionises ambient air for obtaining ionised air therefrom, in which the ionised air is charged for enhancing adhesion of water vapour thereto.
- the condenser portion is disposed alongside the ioniser for condensing water vapour in the ionised air into water droplets.
- FIG. 1 shows a partial schematic diagram of an atmospheric water extraction system according to an embodiment of the invention.
- FIG. 2 shows an operational flow of the atmospheric water extraction system of FIG. 1.
- An atmospheric water extraction system and a method for extracting atmospheric water are described hereinafter for addressing at least one of the aforementioned disadvantages.
- the system 100 generally comprises an extraction unit 1 10, a passage 1 1 1, a water collection unit 1 12 and a cooling unit 1 13.
- the extraction unit 1 10 is for extracting water vapour in ambient air and the extraction unit 1 10 has an intake 1 14 and an exhaust 116 formed therein for allowing flow of the ambient air therethrough.
- the extraction unit 110 comprises an ioniser 1 18 and a condenser portion 120, in which the condenser portion 120 is disposed alongside the ioniser 1 18.
- the extraction unit 110 further comprises an air filter 122, a ventilator 124 and a water collection tray 126.
- the ioniser 1 18 is for ionising the ambient air into ionised air.
- air particles present in the ambient air become positively or negatively charged, although negative charging is preferable in most uses.
- the charged air particles (ionised air) enhance adhesion of water vapour thereto for extracting atmospheric water over varying ambient temperatures and humidity. Due to the polar nature of water, each water molecule has an electric dipole moment. The oxygen atom in each water molecule has a partial negative charge while each hydrogen atom in each water molecule has a partial positive charge. As such, the difference in charge causes water molecules to be attracted to each other and to other polar molecules.
- the ioniser 118 is also for sterilising the ambient air and for inhibiting growth of fungi and bacteria when the system 100 is in use.
- the condenser portion 120 is for condensing water vapour in the ionised air to obtain water droplets.
- the ionised air is transportable for thermal interaction with the condenser portion 120 for condensation of water vapour to take place.
- Condensation of water vapour occurs when a surface is colder than the dew point temperature (condensation threshold temperature) of the air surrounding the surface. At this temperature, the air has a relative humidity of equivalent to 100 percent and the air becomes saturated with water.
- the dew point temperature of the air is dependent on both air temperature and humidity. Therefore, surfaces of the condenser portion 120 over which the ionised air flows must have a temperature that is lower than the dew point of the ionised air.
- the passage 1 1 1 is inter-configured for cyclical passage of fluid therethrough.
- the passage 1 1 1 comprises a first fluid channel 128 and a second fluid channel 130 for interconnecting the extraction unit 110 and the cooling unit 113.
- the first fluid channel 128 is for receiving liquid from the cooling unit 113 and a second fluid channel 130 for returning the liquid to the cooling unit 1 13.
- the cooling unit 113 is in thermal communication with a cooling portion 132 for extracting heat from the liquid passaging through the cooling portion 132 to thereby cool the liquid.
- the liquid is then transportable to the condenser portion 120 subsequent to passaging through the cooling portion 132 for cooling the surfaces of the condenser portion 120 to a temperature that is lower than the dew point temperature of the air surrounding the surfaces for condensation of water vapour to occur.
- the surfaces of the condenser portion 120 can be made of any material of which water vapour condensation can occur in response to cooling of the material in a given environment.
- the material can comprise of metal, glass, plastic, or the like.
- the surfaces of the condenser portion 120 are film-coated with food- grade materials, such as, gold, tin, Teflon or the like in compliance with public health requirements governing use of materials in contact with drinking water.
- the surfaces of the condenser portion 120 are preferably plated with gold or any material of which enhances the rate of heat transfer.
- the condenser portion 120 is preferably designed for optimising air circulation, velocity and distribution of air on the surfaces for achieving an optimal rate of water vapour extraction.
- the cooling unit 113 comprises a drive assembly 136 for displacing the liquid from the cooling unit 1 13 to the condenser portion 120 via the first fluid channel 128.
- the drive assembly 136 comprises an actuator valve 138 and a fluid pump 140.
- the fluid pump 140 is one of a centrifugal pump and a displacement pump.
- the cooling unit 1 13 is couplable to an external cooling source (not shown) for extracting heat from the liquid to cool liquid.
- the external cooling source can comprise a refrigerant, such as Freon, for extracting heat from the liquid.
- the cooling unit 1 13 can tap on the external cooling source for cooling the liquid.
- the liquid is one of water and alcohol, or the like.
- the cooling unit 1 13 further comprises a temperature measurement device 142 for measuring the temperature of the liquid passing therethrough. The temperature of the liquid is preferably in the range of 5 0 C to 15 0 C.
- the ambient air Prior to ionisation of the ambient air by the ioniser 118, the ambient air is passed through the air filter 122 of the extraction unit 110.
- the air filter 122 is for filtering the ambient air and is disposed in the vicinity of the ioniser 1 18.
- the air filter 122 can also be disposed in the intake 114 or in the vicinity of the intake 114. Furthermore, the air filter 122 is replaceable and therefore can be replaced when necessary.
- the ventilator 124 is disposed in the vicinity of the condenser portion 120 and is for displacing and directing the ambient air into the extraction unit 110.
- the ventilator 124 is preferably a form or the like impeller-based air mover controllable to vary flow rate of the ambient air. By varying the flow rate of the ambient air, convecting air currents necessary for obtaining sufficient water vapour condensation on the surfaces of the condenser portion 120 is generatable.
- the ventilator 124 can also be disposed at or adjacent the exhaust 1 16.
- the air filter 122 and the ventilator 124 are orientable or disposed as readily recognised by those skilled in the art to achieve effectively clean or dust-controlled airflow or circulation inside the extraction unit 1 10.
- the water collection tray 126 of the extraction unit 110 is for receiving the water droplets from the condenser portion 120.
- the water collection tray 126 is disposed in the extraction unit 1 10 such that the water droplets received are directed to the water collection unit 112.
- the water collection unit 112 of the system 100 comprises a water collection tank 144, a drive assembly 146 and a water purifier 148.
- the water collection tank 144 is for receiving the water droplets from the water collection tray 126.
- the water collection tank 144 preferably comprises a sediment filter (not shown) for filtering the water droplets received.
- the water collection tank 144 further comprises a water level measurement device 150 for measuring the water level present in the water collection tank 144 and a water purifier 152 for purifying the water droplets received.
- the water level measurement device 150 is an optical or a float switch type while the water purifier 152 preferably comprises an ultra-violet light or an ozone generator. Further, the water purifier 152 may incorporate other filtration means including any mechanical, chemical or biological filtering systems suitable for purifying water for drinking purposes.
- the drive assembly 146 is for transporting water collected in the water collection tank 144 to the water purifier 148 of the water collection unit 112.
- the drive assembly 146 is one of a fluid pump, a centrifugal pump and a displacement pump.
- the drive assembly 146 provides additional gravitational pressure to extract the water collected out of the water collection tank 144 and displace the water through the water purifier 148.
- the water purifier 148 comprises any suitable device capable of sterilising water, for instance, suitable chemical means, heating elements, ultra-violet radiation emitters, or the like.
- the water after passing through the water purifier 148 is suitable for drinking and can be transported through a fluid duct 153 to external appliances or any storage.
- the system 100 further comprises a temperature measurement device 154 for measuring ambient air temperature and a relative humidity measurement device 156 for measuring relative humidity of the ambient air. Additionally, the system 100 further comprises a controller 158 for controlling the system 100. The controller 158 is couplable to a signalling interface module for relaying any control signals for operating any electrically driven parts and components of the system 100 that require instructions, signalling and/or electricity supply.
- the controller 158 preferably comprises a microprocessor (not shown) for storing and executing software applications or embedded codes capable of generating appropriate control signals in accordance with a set of pre-programmed instructions. Measured data is further processable in the controller 158 in which the processes include logging, reading and writing, storing and backing-up, analysing and displaying of measured and/or control data. Further, the controller 158 is coupled to external computing equipment via a wired or wireless data exchange interface (not shown). Finally, electrical power supplied to the controller 158 and the system 100 may be single-phase or multi-phase alternating current tapped from power grids or mobile electricity generators such as those used on vessels, cruises, caravans, oil rigs, construction sites and other similar facilities. Alternatively, electrical power can be supplied as direct current.
- Fig. 2 illustrates the operational flow 200 of the system 100.
- the controller 158 activates the ioniser 1 18 and the ventilator 124. Further, the controller 158 samples data measured by the temperature measurement device 142 of the cooling unit 113, the water level measurement device 150, the temperature measurement device 154 of the system 100 and the relative humidity measurement device 156 at a predetermined regular interval to obtain measured data therefrom. The controller 158 then analyses the measured data and determines the mode of operation, and may display the measured data for visual monitoring by an operator of the system 100 in a step 212.
- the controller 158 retrieves the required controls according to the mode of operation that is determined in the step 212. Further, in a step 216, the controller 158 looks up required controls for required parts of the system 100 based on the measured data. Finally, in a step 218, corresponding control signals provided by the steps 214 and 216 are sent to the corresponding elements of the system 100.
- the controller 158 selects a first mode of operation denoted as a NORMAL mode when (a) the ambient temperature measured by the temperature measurement device 154 is greater than a first predetermined threshold TLA 0 ], (b) the ambient relative humidity measured by the relative humidity measurement device 156 is greater than a first predetermined level RHL 0I , (c) the temperature of the liquid from the cooling portion 132 measured by the temperature measurement device 142 is lower than a predetermined threshold of TLCm, (d) the water level in the water collection tank 144 detected by the water level measurement device 150 does not exceed a predetermined level WLC HI , and (e) if an external water storage tank is present (coupled to the system 100) and the external water storage tank does not indicate FULL state (not shown).
- a NORMAL mode when (a) the ambient temperature measured by the temperature measurement device 154 is greater than a first predetermined threshold TLA 0 ], (b) the ambient relative humidity measured by the relative humidity measurement device 156 is greater than a first predetermined level R
- the controller 158 opens the actuator valve 138 to allow the liquid from the cooling portion 132 to flow into the first fluid channel 128. Further, the controller 158 activates the fluid pump 140 to convey the liquid to the condenser portion 120 via the first fluid channel 128. The liquid is then circulated from the condenser portion 120 back to the cooling portion 132 by means of the second fluid channel 130. The liquid passaging through the condenser portion 120 receives heat from the ionised air during thermal interaction of the ionised air with the condenser portion 120. The liquid is then transportable to the cooling portion 132 of the passage 1 11 for re-cooling thereby subsequent to passaging through the condenser portion 120. The liquid passaging through the passage 11 1 is substantially isobaric.
- Excessive airflow generated by the ventilator 124 may hamper the extraction of water vapour from the ambient air.
- the speed of the airflow generated by the ventilator 124 should preferably be controlled at a predetermined optimised rate.
- the controller 158 can control the ventilator 124 and the controller 158 attains a predetermined airflow by adjusting fan speed of the ventilator 124. In the first mode of operation, the controller 158 sets the fan speed of the ventilator 124 to low or medium.
- the ambient air is then controllably induced into the system 100 by the ventilator 124.
- the incoming air first passes through the air filter 122 followed by an ionising field created by the ioniser 1 18.
- the ionised air then passes through the condenser portion 120 and surrounds the surfaces of the condenser portion 120 in which condensation of water vapour takes place.
- the water droplets obtained after condensation drips onto the water collection tray 126 and are directed into the water collection tank 144.
- the water level measurement device 150 measures the water level present in the water collection tank 144 to detect predetermined high (WLCHI) and low (WLC LO ) water levels.
- the water purifier 152 in the water collection tank 144 is activated by the controller 158 on either a continuous or regular basis with the water purifier 152 being periodically activated for a first duration of WPU ON I and deactivated for a second duration of WPU OFFI -
- the controller 158 activates the drive assembly 146 to transfer the water from the water collection tank 144 through the water purifier 148 of the water collection unit 112.
- the controller 158 can activate the water purifier 148 on either a continuous or regular basis.
- the controller 158 selects a second mode of operation denoted as a COLD mode when (a) the ambient temperature measured by the temperature measurement device
- the ambient relative humidity measured by the relative humidity measurement device 156 is equal to or greater than the predetermined level RHL LO
- the temperature of the liquid from the cooling portion 132 measured by the temperature measurement device 142 equals to or lower than the predetermined threshold of TLC LO
- the water level in the water collection tank 144 detected by the water level measurement device 150 does not exceed the predetermined level WLC HI
- the controller 158 operates the system 100 through the same control and decision-making steps as performed for the NORMAL mode.
- the only exception is that the fan speed of the ventilator 124 is set to high for increasing the air circulation in the vicinity of the condenser portion 120, leading to higher water vapour condensation efficiency when the ambient air temperature is low.
- the controller 158 selects a third mode of operation denoted as a SUSPEND mode when (a) the ambient temperature measured by the temperature measurement device 154 falls below the second predetermined threshold TLA 02 , or (b) the ambient relative humidity measured by the relative humidity measurement device 156 falls below a second predetermined level RHL 02 , or (c) the temperature of the liquid from the cooling portion 132 measured by the temperature measurement device 142 is higher than a predetermined threshold of TLCm, or (d) the water level in the water collection tank 144 detected by the water level measurement device 150 equals or exceeds the predetermined level WLC HI , or (e) if the external water storage tank is present (coupled to the system 100) and the external water storage tank indicates FULL state (not shown).
- a SUSPEND mode when (a) the ambient temperature measured by the temperature measurement device 154 falls below the second predetermined threshold TLA 02 , or (b) the ambient relative humidity measured by the relative humidity measurement device 156 falls below a second predetermined level RHL 02 , or
- the controller 158 stops all the steps required to extract water vapour. However, the ioniser 1 18 and the ventilator 124 can continue to operate controllably by the controller 158. The controller 158 may also continue to monitor all measurement means if any. Further, should the water level in the water collection tank 144 is above WLC L o, the controller 158 may continue to activate the water purifier 152 of the water collection tank 144 on a continuous or periodic basis.
- Exemplary parameters that are preferably used in the system 100 for extracting atmospheric water are as follows:
- the system 100 for extracting water vapour from the ambient air for obtaining potable water provides a solution to water harvesting without the need for extensive water distribution networks.
- the system 100 is well suited for indoor, outdoor, fixed and mobile applications.
- the system 100 is able to ride on external cooling sources such as existing refrigeration and central air system for extracting heat from the liquid for cooling the liquid, the system 100 offers a cost- effective water making system with relatively low equipment, operational and maintenance costs.
- the system 100 is able to operate at an ambient air temperature of as low as 15°C, thus making the system 100 well suited for many indoor and outdoor, fixed and mobile applications not only in tropical regions, but also in temperate areas with ambient air temperatures well below what conventional systems are designed to operate at.
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1005381A GB2467241A (en) | 2007-10-01 | 2008-07-18 | System and method for extracting atmospheric water |
ES201050009A ES2379326B1 (en) | 2007-10-01 | 2008-07-18 | SYSTEM AND METHOD TO EXTRACT ATMOSPHERIC WATER. |
CN2008801192694A CN101932374A (en) | 2007-10-01 | 2008-07-18 | System and method for extracting atmospheric water |
US12/680,576 US20100212348A1 (en) | 2007-10-01 | 2008-07-18 | System and method for extracting atmospheric water |
ZA2010/02984A ZA201002984B (en) | 2007-10-01 | 2010-04-29 | System and method for extracting atmospheric water |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SG200716417-1A SG151140A1 (en) | 2007-10-01 | 2007-10-01 | System and method for extracting atmospheric water |
SG200716417-1 | 2007-10-01 |
Publications (1)
Publication Number | Publication Date |
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WO2009045168A1 true WO2009045168A1 (en) | 2009-04-09 |
Family
ID=40526463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SG2008/000260 WO2009045168A1 (en) | 2007-10-01 | 2008-07-18 | System and method for extracting atmospheric water |
Country Status (7)
Country | Link |
---|---|
US (1) | US20100212348A1 (en) |
CN (1) | CN101932374A (en) |
ES (1) | ES2379326B1 (en) |
GB (1) | GB2467241A (en) |
SG (1) | SG151140A1 (en) |
WO (1) | WO2009045168A1 (en) |
ZA (1) | ZA201002984B (en) |
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WO2013010570A1 (en) * | 2011-07-15 | 2013-01-24 | Hewlett-Packard Indigo B.V. | Recirculation system |
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WO2017058949A1 (en) | 2015-09-28 | 2017-04-06 | Massachusetts Institute Of Technology | Systems and methods for collecting a species |
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Also Published As
Publication number | Publication date |
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CN101932374A (en) | 2010-12-29 |
GB201005381D0 (en) | 2010-05-12 |
GB2467241A (en) | 2010-07-28 |
SG151140A1 (en) | 2009-04-30 |
US20100212348A1 (en) | 2010-08-26 |
ES2379326B1 (en) | 2013-02-15 |
ZA201002984B (en) | 2011-07-27 |
ES2379326A1 (en) | 2012-04-25 |
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