The present disclosure relates to thermally insulated storage tanks. More particularly, the present technology relates to a modular, thermally insulated storage tank for storing hot or cold liquids.
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Each day, the sun provides 10,000 times the amount of energy utilized by the human race. In a single day, it provides more energy than our current population would consume in 27 years. In North America alone, it is believed that close to two trillion dollars is spent annually on energy, much of which is designated towards non-renewable, carbon-based sources, such as oil, coal, and other fossil fuels. When energy consumption for the average U.S. household is approximately 65-80% thermal and approximately 20-35% electrical, it makes sense to derive a means of satisfying both of these requirements through renewable sources.
There have been many advances in the past few decades toward the capture of renewable energy resources, such as water turbines (which convert the kinetic energy of moving water into electricity), wind generators (which convert the energy of the wind into electrical energy), geothermal heating (which utilizes the stability of the subterraneous temperature to provide thermal energy), and solar cells (which allow the capture and conversion of solar energy into electrical energy).
An alternative type of renewable energy is a solar thermal heat exchanger, which utilizes the energy of sunlight to heat a liquid, thereby providing thermal energy for heating or cooling. In this type of energy harnessing, typically a flat plate is blackened on the front to improve absorption of solar radiation and is arranged with its blackened surface facing the sun and sloped at a suitable angle to optimize the energy collected. A series of tubes is secured to the panel, and water to be heated is circulated through these tubes to extract the heat received by the panel. The innovative thermal capture systems require that the circulated heated water be stored for further energy extraction. The warmed water from solar thermal heat exchangers is normally circulated through a separate tank so that the temperature may build up to a maximum value being a balance between the heat input and heat losses in the system. This water can then used as feed water for heating non-heated water for domestic use through the use of in tank heat exchangers.
While the volumes of heated recirculation water varies with the size of the solar thermal heat exchangers mounted to a residential or commercial structure, a tank of sufficient size to store all of the systems liquid is required to be maintained on site. To maximize thermal energy capture, these liquid storage tanks are often located in basements of homes and businesses, particularly in the northern climates where placement of the storage tank in the exterior of the building structure may lead to tank failure and at best, loss of captured thermal energy, especially in the winter months. Similar but opposite considerations apply for the storage of cold liquids, refrigerants and the like in warmer climates, where the most suitable storage location for these tanks are also often in lower levels of the home or business, especially during the hotter months.
Often, large prefabricated storage tanks are difficult to maneuver and placement in lower levels and basements of homes and businesses are hampered by the fact that the average door widths range from 87 to 92 cm (34¼ to 36¼ inches), far smaller than the dimensions of the storage tanks. Moreover, given their bulk and weight, prefabricated storage tanks in capacities of hundreds of gallons to thousands of gallons are difficult to reposition once they have been previously established.
It is therefore an object of the present technology to provide a thermally insulated storage tank, which may provide a temperature, regulated liquid for circulation to an outside tank or other thermal capture devices.
It is another object of the present technology to provide a thermally insulated storage tank that is thermally highly efficient in design, by being modular and easily assembled in difficult to reach areas.
A further object of the present technology is to provide a thermally regulated storage tank that can interface with a business or residential thermal capture panel system. A liquid stored in the thermally insulated tank is capable of heating or cooling a second source of circulating water for domestic or commercial use. When the stored liquid is hot, it can then be recirculated back to the thermal capture system to become reheated again.
Finally, it is an object of the present technology to provide an insulated storage tank, which is both economical and simple to manufacture, as well as easy to install.
These and other objects will become apparent from the present technology comprising an insulated storage tank designed to incorporate a means of storing both hot and cold liquids including water, antifreeze and compressed liquefied gasses. The insulated storage tank includes an inner liner supported by a plurality of vertical insulating panels. The insulating panels are arranged circumferentially to form a cylinder, each insulating panel in contact with a leading edge and a trailing edge of another insulating panel. The insulating panels are freestanding and are further supported by an outer support jacket. The liquid is placed within the inner liner and will assert a force against the insulating panels. Thermal energy in the liquids are further insulated by an insulating lid that is disposed within the upper circumference of the insulating panels and forms an insulating seal with the inner liner. Optionally, the insulating panel rests on an insulating floor that is sized and shaped to fit within the void provided by the lower circumference of the insulating panels
Other optional components can include a plumbing board having inlet and outlet liquid ports for introducing and removing liquid from the insulated storage tank chamber, microprocessors and pumps, temperature sensors, water level sensors and other monitoring systems to regulate the volume and temperature of a liquid in the thermally insulated tank. Also contemplated as an optional feature includes a heat exchanger operable to circulate a liquid, for example, domestic potable water capable of being heated by the stored liquid in the insulated storage tank. The potable water can be used for domestic purposes such as filling a home hot water tank, for use in laundry, for heating the home and other known heating or cooling applications.
Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.
Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.
Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a”, “an” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
When an element or layer is referred to as being “on”, “engaged to”, “connected to” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to”, “directly connected to” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
Spatially relative terms, such as “inner,” “outer,” “beneath”, “below”, “lower”, “above”, “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Referring now to the figures, particularly
In some embodiments the outer support jacket 30 can have a width ranging from about 0.1 mm about 10 mm wide, or from about 1 mm to about 10 mm, or from about 2 mm to about 10 mm, or from about 0.1 mm to about 9 mm, or from about 0.1 mm to about 7 mm, or from about 0.1 mm to about 5 mm. The ends 35 of the outer support jacket 30 can be overlaid and glued together around the insulating panels 100 as shown in
In some embodiments, the insulated storage tank 10 includes an insulating lid 20. Insulating lid 20 can be made from any generally known insulation material including expanded polypropylene, thermosetting plastic foams, thermoplastic polyolefins, fiberglass, expanded perlite, wood, metals and any material that is capable of retaining the heat or cold in the liquids within the insulated storage tank 10. Foam is preferably used because of the superior heat transfer properties provided by foam materials, relative ease of manufacture and it's lightweight. As shown in
The insulating lid 20 can optionally house, support and integrate a variety of mechanical and electrical components that provide diagnostic and operational functionality to the insulated storage tank 10. For example, insulating lid 20 can be mounted with a plumbing board to provide all of the hydraulic operational requirements of the tank, for example, liquid input and output and sampling. Control unit 60 can also include a variety of mechanical and electrical components such as logic boards, relays, microprocessors and the like to send and receive electrical signals to and from a variety of mechanical and electrical components, for example, pumps and sensors. A variety of sensors can be included and mounted onto insulating lid 20, for example, water level sensor 75 mounted to the lid with the aid of a seal 70. Water level sensor 75 can be free-standing or can be integrated with control unit 60 and a pump (not shown) to determine the level of liquid in the insulated storage tank 10. Upon liquid volume loss in the insulated storage tank 10, liquid level sensor 75 can detect the deficiency and send a signal to control unit 60 to activate a pump to fill the tank with more liquid. Temperature sensor 65 can also be integrated with control unit 60 and measure the temperature of the liquid in the insulated storage tank 10.
If the liquid in the insulated storage tank 10 falls below a predetermined threshold, temperature sensor 65 can send a signal to a valve (not shown) to reduce the volume of liquid being recirculated on the roof of a residence from entering into the insulated storage tank 10. Alternatively, the temperature sensor 65 can alert the system if the liquid in the insulated storage tank 10 rises above a predetermined threshold. In such a case, the temperature sensor 65 can send a signal to a pump (not shown) to increase the flow of a secondary liquid being circulated in a heat exchanger (not shown) which is placed in the insulated storage tank 10 to extract heat from the liquid in the insulated storage tank 10. In addition, liquid inlet 50 and liquid outlet 55 can be used to add materials into the insulated storage tank 10, or to remove materials, including liquids, within the insulated storage tank 10. Generally, insulating lid 20 has a diameter that is slightly larger than the internal diameter 500 shown in
Referring now to
Insulating panel 100 has a leading edge contact surface 140 forms a leading edge apex 142 with a trailing edge offset 210. The placement of the leading edge contact surface 140 of one insulating panel 100 in direct contact with the trailing edge contact surface 150 of the next insulating panel 100 in succession (in a clock wise fashion) has been surprisingly found to provide substantial resistance to radial movement of the insulating panels due to the hydrostatic force created by liquid. All of the insulating panels 100 can be connected with the use of a clasping mechanism placed on the exterior arcuate surface 120. Alternatively, the leading edge contact surface 140 and the trailing edge contact surface 150 of insulating panels 100 can each have male and female interlocking structure that can approximate the two contact surfaces 140 and 150 and lock them into position. Preferably, the insulating panel 100 can all be clasped or structurally held in position by placing an outer support jacket 30 around the exterior arcuate surface 120 as shown in
It has been determined that for a 60 inch outer diameter/350 gallon insulated storage tank 10, the pressure exerted on a 1 mm thick TPO outer support jacket 30 after the insulated storage tank 10 has been fully assembled having an insulating panel thickness of 4.4 inches, and an inner liner 400 storing 330 gal of water, 1 m high column of water, inner tank radius of 25.6 inches) is approximately 1084 psi which is well within its tensile yield of 3100 psi. For a 2000 gallon tank with a 2 mm thick TPO outer support jacket using the same column water height but an inner radius of 61.1 inches, the stress on the outer support jacket 30 is approximately 1184.5 psi and is also well within its tensile yield of 3100 psi.
The insulating panel 100 can also be made of any suitable modular material as described above for the insulating lid 20. These can include expanded polypropylene, thermosetting plastic foams, thermoplastic polyolefins, fiberglass, expanded perlite, wood, metals and any material that is capable of retaining the heat or cold in the liquids within the insulated storage tank 10. Foam is preferably used because of the superior heat transfer properties provided by foam materials, relative ease of manufacture and is lightweight. The dimensions of the insulating panel 100 can vary according to the size of the insulated storage tank 10 needed. For example, for a 330 gallon insulated storage tank, 5 insulating panels 100 can be used form a complete cylinder. For a 330 gallon insulated storage tank 10, each insulating panel 100 can measure approximately 47 inches in height, an arcuate length of 34.5 inches and a width of approximately 4 inches. In some embodiments, the number of insulating panels 100 used to form the insulated storage tank 10 can vary, preferably there are 5 insulating panel 100 per insulated storage tank 10.
In some embodiments of the present technology, the insulated storage tank 10 can also optionally have an insulating floor 25. While not essential to the practice of the present technology, an insulating floor 25 can be used with the bottom cutout in the insulating panel 100 to provide a unified structure that is configured to resist the hydrostatic stresses imposed on the insulated storage tank 100 walls. As illustrated in
Best shown in
With reference now to
The present technology affords a simple manner in which to prepare on site an insulated storage tank having liquid capacities ranging from 50 gallons to 5,000 gallons. The insulated storage tank has many used for storing both hot and cold liquids.
In a preferred embodiment, the hot liquid stored in the insulated storage tank 10 can include liquids (e.g. water), that are recirculated through a solar thermal capture device, for example, the Power Panel Solar/Thermal capture device disclosed in International Application PCT/US2008/078822, filed Oct. 3, 2008, the disclosure of which is incorporated herein in its entirety. The stored hot liquids (e.g. water) recirculating through said Power Panel Solar/Thermal capture device can reach temperatures ranging from 75-120° C. The stored hot liquid in the insulated storage tank 10 of the present technology can be used to heat a secondary potable water source (for example a domestic home water source) with the use of heat exchangers placed in the insulated storage tank 10. Similarly, heat exchangers placed in insulated storage tanks storing compressed liquids such as carbon dioxide can be used to cool a secondary liquid source for residential or commercial cooling. The rate of recirculation through the solar/thermal energy capture device and passage into the insulated storage tank 10 can be automated to maintain a set temperature within the insulated storage tank 10.
The embodiments and the examples described herein are exemplary and not intended to be limiting in describing the full scope of compositions and methods of the present technology. Equivalent changes, modifications and variations of some embodiments, materials, compositions and methods can be made within the scope of the present technology, with substantially similar results.
This application claims the benefit of U.S. Provisional Application No. 61/208,275 filed on Feb. 20, 2009. The entire disclosure of the above application is incorporated herein by reference.
Number | Date | Country | |
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61208275 | Feb 2009 | US |