A continuous non-energy-consuming adsorption water production device

Abstract

The application discloses a kind of persistent non-energy consumption adsorption water production device, belongs to the field of engineering thermophysics.The application is simple in structure, and based on bridge type thermal rectification, can continuously and cyclically work, converts periodic solar energy and radiation refrigeration into 24 hours constant high temperature and low temperature, carries out multiple water absorption and release cycles within a day, and greatly improves water production.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engineering thermophysics, and particularly relates to a continuous non-energy-consumption adsorption water production device. BACKGROUND

[0002] The adsorption water production device uses porous water-absorbing material to adsorb and condense water vapor in the atmosphere and store it in the pores at low temperature, and evaporate the internal liquid water and release it into the container at high temperature, and then liquefy it into liquid water on the surface of the condenser and collect it for use.

[0003] The existing adsorption water production device is divided into two types, one of which uses an external energy source such as electricity to provide low temperature and high temperature for the porous material to adsorb and release water; the other uses solar radiation to provide high temperature during the day and uses radiation cooling to provide low temperature at night, and drives the device without energy consumption.

[0004] However, the first method requires additional energy consumption, and the second method can only perform water adsorption and release cycle for about 2 to 4 hours once a day, which is extremely low in efficiency. SUMMARY

[0005] The present application provides a continuous non-energy-consumption adsorption water production device, which can solve the above problems. The technical solution is as follows:

[0006] A continuous non-energy-consumption adsorption water production device is provided, which comprises a bridge-type thermal rectification device, a heat-released water device, and a cold water absorption device.

[0007] The bridge-type thermal rectification device is used to convert solar energy and radiation cooling energy which changes periodically with the day and night into a continuously unidirectional biased high-temperature heat source and a low-temperature heat source.

[0008] The heat-released water device is used to release and condense the water after heating the porous material.

[0009] The cold water absorption device is used to condense, adsorb and store water vapor in the atmosphere by using low temperature and porous structure.

[0010] Optionally, the bridge-type thermal rectification device comprises a photon absorption radiation plate 1.1, a hot-end thermal diode 1.2, a cold-end thermal diode 1.3, a hot-end thermal capacitor 1.4, a cold-end thermal capacitor 1.5, and an adiabatic shell 1.6.

[0011] One end of the hot-end thermal diode 1.2 is connected with the hot-end thermal capacitor 1.4, and the other end of the hot-end thermal diode 1.2 is connected with the photon absorption radiation plate 1.1.

[0012] One end of the cold-end thermal diode 1.3 is connected with the cold-end thermal capacitor 1.5, and the other end of the cold-end thermal diode 1.3 is connected with the photon absorption radiation plate 1.1.

[0013] The photon-absorbing radiation plate 1.1 is used to absorb sunlight during the day for heating and to radiate and cool at night. The hot-end thermal diode 1.2 and the cold-end thermal diode 1.3 are used to modulate the direction of heat flow. The hot-end thermal capacity 1.4 and the cold-end thermal capacity 1.5 are used to store heat and control the output temperature. The heat-insulating shell 1.6 is used to wrap the device and isolate the various parts from parasitic heat leakage between them and the environment.

[0014] Optionally, the conduction direction of the hot-end thermal diode 1.2 is from the photon-absorbing radiation plate 1.1 to the hot-end thermal capacity 1.4.

[0015] The conduction direction of the cold-end thermal diode 1.3 is from the cold-end thermal capacity 1.5 to the photon absorption radiation plate 1.1.

[0016] Optionally, the thermal resistances of the hot-end thermal diode 1.2 and the cold-end thermal diode 1.3 satisfy R B / R E ≥8.7, R F / R E ≤0.08, R F R represents the on-state thermal resistance of each thermal diode. B Indicates the open thermal resistance of each thermal diode;

[0017] The heat capacity value of the hot end, 1.4, satisfies R. E* C hot / τ≥1, the heat capacity of the cold end with a heat capacity of 1.5 satisfies R E* C cold / τ≥0.5, where C hot With C cold The heat capacity values ​​of the hot end (1.4) and the cold end (1.5) are represented in J / K, τ represents the alternating diurnal cycle period in seconds, and R... E The equivalent thermal resistance between the hot end heat capacity 1.4 and the cold end heat capacity and the environment is expressed in K / W.

[0018] Optionally, the pyrolysis water release device includes a hot end heat equalization layer 2.1, a water-absorbing material to be released 2.2, a condensation chamber 2.3, a condensation plate 2.4, a cooling fin 2.5, and a water vapor barrier layer 2.6;

[0019] One end of the hot end heat equalization layer 2.1 is in thermal contact with the hot end heat capacity 1.4, and the other end of the hot end heat equalization layer 2.1 is in thermal contact with the water adsorption material 2.2 to be released, and together with the condenser plate 2.4 and the water vapor isolation layer 2.6, they surround the condensation cavity 2.3; one end of the cooling fin 2.5 is in thermal contact with the condenser plate 2.4, and the other end of the cooling fin 2.5 is exposed to the environment;

[0020] The hot-end uniform heating layer 2.1 is used for homogenizing the high temperature provided by the hot-end heat container 1.4 and heating the water adsorption material 2.2 to be released; the condensing cavity 2.3 is used for temporarily storing the uncondensed water vapor; the condensing plate 2.4 is used for radiating heat to the environment through the refrigeration fin 2.5 and condensing the water vapor in the condensing cavity 2.3 into condensed water as the final product; the refrigeration fin 2.5 is used for being in thermal contact with the environment and the condensing plate 2.4, and radiating the heat of the condensing plate 2.4 to the environment; the water vapor barrier layer 2.6 is water vapor impermeable, and the water vapor barrier layer 2.6 is used for isolating the condensing cavity 2.3 from the environment.

[0021] Optionally, the thermal conductivity of the hot-end uniform heating layer 2.1, the condensing plate 2.4 and the refrigeration fin 2.5 is at least 200 W / (m*k).

[0022] Optionally, the porosity of the water adsorption material 2.2 to be released is greater than 90%.

[0023] Optionally, the equivalent convective heat transfer coefficient h of the refrigeration fin 2.5 in the environment is greater than or equal to 30 W / (m 2 *k).

[0024] Optionally, the water adsorption device comprises a water adsorption material 3.1 to be adsorbed and a cold-end uniform heating layer 3.2.

[0025] One end of the cold-end uniform heating layer 3.2 is in thermal contact with the cold-end heat container 1.5, and the other end of the cold-end uniform heating layer 3.2 is in thermal contact with the water adsorption material 3.1 to be adsorbed, and the water adsorption material 3.1 to be adsorbed is exposed to the environment.

[0026] The water adsorption material 3.1 to be adsorbed is used for condensing, liquefying, adsorbing and storing the water vapor in the environment in the internal pores; and the cold-end uniform heating layer 3.2 is used for homogenizing the low temperature provided by the cold-end heat container 1.5 and cooling the water adsorption material 3.1 to be adsorbed.

[0027] Optionally, the porosity of the water adsorption material 3.1 to be adsorbed is greater than 90%.

[0028] The present application can bring the beneficial effects:

[0029] The water adsorption device of the present application has the advantages of simple structure, sustainable and continuous circulation based on bridge-type thermal rectification, periodic solar energy and radiation refrigeration being converted into 24-hour constant high temperature and low temperature, multiple water adsorption and release cycles in a day, and greatly improved water production. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1Fig. 1 shows a structural schematic diagram of a persistent non-energy-consumption adsorption water production device according to an example embodiment of the present application;

[0031] Figure 2 Fig. 2 shows a principle schematic diagram of a porous adsorption material at low temperature (or at night);

[0032] Figure 3 Fig. 3 shows a principle schematic diagram of a porous adsorption material at high temperature (or during the day);

[0033] Figure 4 Fig. 4 shows a cycle working principle diagram of a cold water absorption and hot water release device;

[0034] Figure 5 Fig. 5 shows a water production calculation diagram of different devices and working conditions. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0036] In the present document, "a plurality of" refers to two or more. "And / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A existing alone, A and B existing together, and B existing alone. The character " / " generally represents an "or" relationship between the front and rear associated objects.

[0037] Please refer to Figure 1 Fig. 1 shows a structural schematic diagram of a persistent non-energy-consumption adsorption water production device according to an example embodiment of the present application.

[0038] As shown in Figure 1 , a persistent non-energy-consumption adsorption water production device is provided, which includes a bridge-type thermal rectification device, a hot water release device and a cold water absorption device.

[0039] The bridge-type thermal rectification device is used to convert solar energy and radiant refrigeration energy, which changes periodically with day and night, into a persistent unidirectional biased high-temperature heat source and a low-temperature heat source. The hot water release device is used to release and condense and collect water vapor after the porous material is heated. The cold water absorption device is used to condense, absorb and store water vapor in the atmosphere by using low temperature and porous structure.

[0040] Optionally, the bridge-type thermal rectification device includes a photon absorption radiation plate 1.1, a hot end thermal diode 1.2, a cold end thermal diode 1.3, a hot end thermal capacitor 1.4, a cold end thermal capacitor 1.5 and an adiabatic shell 1.6. One end of the hot end thermal diode 1.2 is connected with the hot end thermal capacitor 1.4, and the other end of the hot end thermal diode 1.2 is connected with the photon absorption radiation plate 1.1. The material thereof includes, but is not limited to, aluminum, copper and other high-thermal-conductivity and high-thermal-capacitance metal materials.

[0041] One end of the cold-side thermionic diode 1.3 is connected to the cold-side thermal capacitor 1.5, and the other end of the cold-side thermionic diode 1.3 is connected to the photon absorption radiation plate 1.1.

[0042] The photon absorption radiation plate 1.1 is used for absorbing sunlight during the day to warm up and radiating heat at night, and the spectrum thereof is a black body, a selective absorber, or a black body / adaptive selective absorption; including but not limited to black body materials such as aluminum oxide, polydimethylsiloxane (PDMS), and the like, selective absorption materials such as germanium, silicon, and the like, which absorb (do not absorb) sunlight (infrared) wave bands, and adaptive spectrum materials based on vanadium oxide and the like.

[0043] The hot-side thermionic diode 1.2 and the cold-side thermionic diode 1.3 are used to modulate the direction of heat flow, the hot-side thermal capacitor 1.4 and the cold-side thermal capacitor 1.5 are used to store heat and control the output temperature, and the adiabatic shell 1.6 is used to wrap the device to isolate the parts from the environment and the parasitic heat leakage.

[0044] The implementation of the modulated heat flow direction includes but is not limited to a thermal switch, a thermal diode, a thermal triode, and the like nonlinear thermal conduction devices, and the driving mode includes but is not limited to the volume deformation of phase change materials such as paraffin, the spectrum change of materials such as vanadium oxide, and the like.

[0045] Optionally, the conduction direction of the hot-side thermionic diode 1.2 is from the photon absorption radiation plate 1.1 to the hot-side thermal capacitor 1.4.

[0046] The conduction direction of the cold-side thermionic diode 1.3 is from the cold-side thermal capacitor 1.5 to the photon absorption radiation plate 1.1.

[0047] Optionally, the thermal resistance R B of the hot-side thermionic diode 1.2 and the cold-side thermionic diode 1.3 E ≥8.7, and the thermal resistance R F of the hot-side thermionic diode 1.2 and the cold-side thermionic diode 1.3 E ≤0.08. F R B represents the on-state thermal resistance of each thermionic diode, and R E* represents the off-state thermal resistance of each thermionic diode.

[0048] The heat capacity of the hot-side thermal capacitor 1.4 satisfies R hot C E* / τ≥1, and the heat capacity of the cold-side thermal capacitor 1.5 satisfies R cold C hot / τ≥0.5, wherein C cold represents the heat capacity of the hot-side thermal capacitor 1.4 and the cold-side thermal capacitor 1.5, the unit is J / K, τ represents the alternating day and night change period, the unit is s, R E represents the equivalent heat exchange thermal resistance between the hot-side thermal capacitor 1.4 and the cold-side thermal capacitor and the environment, the unit is K / W.

[0049] Optionally, the heat-releasing water device comprises a hot-end uniform heating layer 2.1, a water-releasing adsorbent material 2.2, a condensation cavity 2.3, a condensation plate 2.4, a refrigeration fin 2.5, and a water-vapor insulation layer 2.6.

[0050] One end of the hot-end uniform heating layer 2.1 is in thermal contact with the hot-end heat capacity 1.4, and the other end is in thermal contact with the water-releasing adsorbent material 2.2, and together with the condensation plate 2.4 and the water-vapor insulation layer 2.6, it encloses the condensation cavity 2.3. One end of the refrigeration fin 2.5 is in thermal contact with the condensation plate 2.4, and the other end is exposed to the environment.

[0051] The hot-end uniform heating layer 2.1 homogenizes the high temperature provided by the hot-end heat capacity 1.4, and heats the water-releasing adsorbent material 2.2 to vaporize the internal water and release it into the condensation cavity 2.3. Subsequently, the water vapor is liquefied into condensed water on the condensation plate 2.4, and the refrigeration fin 2.5 releases heat to the environment, and the entire process occurs in the package of the water-vapor insulation layer 2.6.

[0052] The hot-end uniform heating layer 2.1 is used to homogenize the high temperature provided by the hot-end heat capacity 1.4 and heat the water-releasing adsorbent material 2.2, the condensation cavity 2.3 is used to temporarily store uncondensed water vapor, the condensation plate 2.4 is used to dissipate heat to the environment through the refrigeration fin 2.5 and condense the water vapor in the condensation cavity 2.3 into the final product condensed water, the refrigeration fin 2.5 is used to make thermal contact with the environment and the condensation plate 2.4 to dissipate heat from the condensation plate 2.4 to the environment, and the water-vapor insulation layer 2.6 is impermeable to water vapor, and is used to isolate the condensation cavity 2.3 from the environment.

[0053] Optionally, the thermal conductivity of the hot-end uniform heating layer 2.1, the condensation plate 2.4, and the refrigeration fin 2.5 is at least 200 W / (m*k), and the material includes but is not limited to metal materials such as aluminum, copper, etc.

[0054] Optionally, the water-releasing adsorbent material 2.2 has a porosity requirement of >90% and is water-absorbing, and the material includes but is not limited to porous silica gel, metal organic framework (MOF) Zr6O4(OH)4, etc.

[0055] Optionally, the equivalent convective heat transfer coefficient h of the refrigeration fin 2.5 in the environment is ≥30 W(m 2 *k).

[0056] Optionally, the cold water-absorbing device comprises a water-absorbing adsorbent material 3.1 and a cold-end uniform heating layer 3.2.

[0057] One end of the cold-end uniform heating layer 3.2 is in thermal contact with the cold-end heat capacity 1.5, and the other end of the cold-end uniform heating layer 3.2 is in thermal contact with the water-absorbing adsorbent material 3.1 to be cooled, which is exposed to the environment. The water-absorbing adsorbent material 3.1 is cooled to condense, liquefy, adsorb and store water vapor in the internal pores of the environment. The cold-end uniform heating layer 3.2 is used to homogenize the low temperature provided by the cold-end heat capacity 1.5 and cool the water-absorbing adsorbent material 3.1. The material includes but is not limited to metal materials such as aluminum, copper, etc.

[0058] Figure 2 The schematic diagram of the principle of the porous adsorbent material at low temperature (or night), and Figure 3 The schematic diagram of the principle of the porous adsorbent material at high temperature (or day).

[0059] As shown in Figure 2 The principle of the cold water absorption device working alone is that at night or other low temperature period, the upper photon absorption / radiation plate spontaneously cools through radiation refrigeration and convective heat transfer, thereby making the temperature of the lower porous adsorbent material below the dew point temperature, condensing and adsorbing and storing water vapor in the environment.

[0060] As shown in Figure 3 The principle of the heat release water device working alone is that during the day or other high temperature period, the upper photon absorption / radiation plate spontaneously heats up by absorbing solar energy, thereby heating the lower porous adsorbent material to evaporate the liquid water stored inside and release it into the condensation cavity of the wrapped device, and then condense and collect fresh water on the surface of the lower condensation plate at a lower temperature. The heat generated by the liquefaction of water vapor is released to the environment through the lower refrigeration fins to maintain a lower temperature of the condenser.

[0061] Optionally, the porosity requirement of the water-absorbing adsorbent material 3.1 is > 90%, and the water-absorbing adsorbent material 3.1 is a porous adsorbent material with water absorption, which includes but is not limited to porous silica gel, metal organic framework structure (MOF) Zr6O4(OH)4, etc. After cooling, the water vapor in the atmosphere is condensed, adsorbed and stored in the internal pores.

[0062] As shown in Figure 4 The working principle of the existing solar-driven adsorption water production device is shown. At night or other low temperature period, the upper photon absorption / radiation plate spontaneously cools through radiation refrigeration and convective heat transfer, thereby making the temperature of the lower porous adsorbent material below the dew point temperature, condensing and adsorbing and storing water vapor in the environment. During the day or other high temperature period, the upper photon absorption / radiation plate spontaneously heats up by absorbing solar energy, thereby heating the lower porous adsorbent material to evaporate the liquid water stored inside and release it into the condensation cavity of the wrapped device, and then condense and collect fresh water on the surface of the lower condensation plate at a lower temperature. The heat generated by the liquefaction of water vapor is released to the environment through the lower refrigeration fins to maintain a lower temperature of the condenser.

[0063] As Figure 5 The water production effect of the prior art method and the method proposed in the application is compared. Figure 5 a is Figure 4 The water production of the prior art method is shown, which can only be circulated once in a day: after adsorption saturation at night, waiting for sunrise, and then releasing water after heat absorption, the yield is about 300g / (m 2 *day). Figure 5 b is the water production of the device in the application: the porous material is immediately transferred to the hot end for release after adsorption saturation at the cold end, and then transferred to the cold end for adsorption after release, which can be circulated about 6 times in a day, and the yield is about 1740g / (m 2 *day). Figure 5 c is the water production of the optimized working mode of the device in the application: two porous materials are adsorbed at the cold end and released at the hot end respectively, when the porous material at the hot end is completely released, the two porous materials are immediately exchanged, the saturated porous material is transferred to the hot end for release, and the empty porous material is transferred to the cold end for adsorption, which maximizes the use of high temperature and low temperature provided by the device, and can be circulated 24 times in a day, and the yield is about 5520g / (m 2 *day).

[0064] In summary, the continuous non-energy consumption adsorption water production device of the application has a simple structure, can continuously and cyclically work based on the bridge type thermal rectification, converts periodic solar energy and radiation refrigeration into constant high temperature and low temperature for 24 hours, and can be circulated multiple times in a day, which greatly improves the water production.

[0065] The above is only an optional embodiment of the application, and does not limit the application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A continuous non-energy consuming adsorption water production device, characterized in that, The device comprises a bridge-type thermal rectifier device, a thermal water release device, and a cold water absorption device. The bridge-type thermal rectifier device is used to convert solar energy and radiant refrigeration energy, which changes periodically with the day-night cycle, into a high-temperature heat source and a low-temperature heat source with a continuous unidirectional bias. The bridge-type thermal rectifier device comprises a photon absorption radiation plate (1.1), a hot-end thermal diode (1.2), a cold-end thermal diode (1.3), a hot-end thermal capacitor (1.4), a cold-end thermal capacitor (1.5), and an adiabatic shell (1.6). One end of the hot-end thermal diode (1.2) is connected to the hot-end thermal capacitor (1.4), and the other end of the hot-end thermal diode (1.2) is connected to the photon absorption radiation plate (1.1). One end of the cold-end thermal diode (1.3) is connected to the cold-end thermal capacitor (1.5), and the other end of the cold-end thermal diode (1.3) is connected to the photon absorption radiation plate (1.1). The photon absorption radiation plate (1.1) is used to absorb sunlight during the day to warm up and radiate to cool down at night, the hot-end thermal diode (1.2) and the cold-end thermal diode (1.3) are used to modulate the direction of heat flow, the hot-end thermal capacitor (1.4) and the cold-end thermal capacitor (1.5) are used to store heat and control the output temperature, and the adiabatic shell (1.6) is used to wrap the bridge-type thermal rectifier device to isolate each part from the environment and prevent parasitic heat leakage. The thermal water release device is used to release and condense the water vapor after heating the porous material. The thermal water release device comprises a hot-end uniform heating layer (2.1), a water release adsorption material (2.2), a condensation cavity (2.3), a condensation plate (2.4), a refrigeration fin (2.5), and a water vapor isolation layer (2.6). One end of the hot-end uniform heating layer (2.1) is in thermal contact with the hot-end thermal capacitor (1.4), and the other end of the hot-end uniform heating layer (2.1) is in thermal contact with the water release adsorption material (2.2), and together with the condensation plate (2.4) and the water vapor isolation layer (2.6), it forms the condensation cavity (2.3); one end of the refrigeration fin (2.5) is in thermal contact with the condensation plate (2.4), and the other end of the refrigeration fin (2.5) is exposed to the environment. The hot-end uniform heating layer (2.1) is used to homogenize the high temperature provided by the hot-end thermal capacitor (1.4) and heat the water release adsorption material (2.2); the condensation cavity (2.3) is used to temporarily store uncondensed water vapor; the condensation plate (2.4) is used to dissipate heat to the environment through the refrigeration fin (2.5) and condense the water vapor in the condensation cavity (2.3) into condensed water as the final product; the refrigeration fin (2.5) is used to be in thermal contact with the environment and the condensation plate (2.4) to dissipate the heat of the condensation plate (2.4) to the environment; the water vapor isolation layer (2.6) is impermeable to water vapor, and the water vapor isolation layer (2.6) is used to isolate the condensation cavity (2.3) from the environment; The cold water absorption device is used to condense, absorb, and store water vapor in the atmosphere using low temperature and porous structure. The cold water suction device comprises a water suction adsorption material (3.1) and a cold end uniform heat layer (3.2); One end of the cold end uniform heat layer (3.2) is in thermal contact with the cold end heat capacity (1.5), and the other end of the cold end uniform heat layer (3.2) is in thermal contact with the water suction adsorption material (3.1); the water suction adsorption material (3.1) is exposed to the environment; The water suction adsorption material (3.1) is used to condense, liquefy, adsorb and store water vapor in the internal pores in the environment; the cold end uniform heat layer (3.2) is used to homogenize the low temperature provided by the cold end heat capacity (1.5) and cool the water suction adsorption material (3.1).

2. The persistent non-energy consumption adsorption water production device according to claim 1, wherein the conduction direction of the hot end thermal diode (1.2) is from the photon absorption radiation plate (1.1) to the hot end heat capacity (1.4); and the conduction direction of the cold end thermal diode (1.3) is from the cold end heat capacity (1.5) to the photon absorption radiation plate (1.1).

3. The persistent non-energy consumption adsorption water production device according to claim 1, wherein the thermal resistance of the hot end thermal diode (1.2) and the cold end thermal diode (1.3) satisfies RB / RE≥8.7 and RF / RE≤0.08, wherein RF represents the conduction thermal resistance of each thermal diode, and RB represents the disconnection thermal resistance of each thermal diode; the heat capacity value of the hot end heat capacity (1.4) satisfies RE*Chot / τ≥1, and the heat capacity of the cold end heat capacity (1.5) satisfies RE*Ccold / τ≥0.5, wherein Chot and Ccold represent the heat capacity values of the hot end heat capacity (1.4) and the cold end heat capacity (1.5), the unit is J / K, τ represents the alternating day-night change period, the unit is s, and RE represents the equivalent heat exchange thermal resistance between the hot end heat capacity (1.4) and the cold end heat capacity and the environment, the unit is K / W. The thermal conductivity of the hot end uniform heat layer (2.1), the condensation plate (2.4) and the refrigeration fin (2.5) is at least 200 W / (m*k). The porosity requirement of the water release adsorption material (2.2) is >90%. The equivalent convective heat exchange coefficient h of the refrigeration fin (2.5) in the environment is ≥30 W(m2*k). The porosity requirement of the water suction adsorption material (3.1) is >90%.

4. The self-sustaining non-energized adsorptive water production device of claim 1, wherein, ​ 5. The persistent non-energy-consuming adsorption water producing device according to claim 1, characterized in that, ​ 6. The persistent non-energy-consuming adsorption water producing device according to claim 1, wherein, ​ 7. The persistent non-energy-consuming adsorption water generator device according to claim 1, wherein, ​

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