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Ground-coupled heat exchange for heating and air conditioning applications

A heat exchanger and thermal energy technology, which is applied in the field of ground coupling/soil source/ground source thermosiphon, and the field of ground coupling thermosiphon heating and cooling structures, which can solve the problems of thermal short circuit and efficiency drop, non-optimal heat transfer coupling, etc.

Inactive Publication Date: 2010-12-15
犹他州立大学研究基金会
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these systems require constant pumping of fluid through the system and the heat transfer coupling between the tubes and the surrounding soil is not optimal
Additionally, vertical drilling systems utilize adjacent hot and cold pipes, which causes some thermal short-circuiting and loss of efficiency
[0005] Currently, the development of improved heating and cooling systems, either by improving existing systems or by discovering new materials that meet all the desired requirements for practical applications, remains a complex and challenging task

Method used

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  • Ground-coupled heat exchange for heating and air conditioning applications
  • Ground-coupled heat exchange for heating and air conditioning applications
  • Ground-coupled heat exchange for heating and air conditioning applications

Examples

Experimental program
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example 1

[0057] Example 1 - Heat load calculations for typical residential buildings in Utah

[0058] Solar energy available in Utah is about 1670 kWh / m 2 / year. At 70% solar collection efficiency, this solar energy will be about 1169 kWh / m 2 / year or 4.2GJ (gigajoules) / m 2 / year. Use solar constant 1.370kW / m 2 , 4.6 kWh / m 2 / day annual average, 1.7 kWh / m 2 / day monthly average (minimum in December) and 7.4 kWh / m 2 Solar energy is calculated as the monthly average (maximum in June) per day.

[0059] The table below represents heating and cooling loads based on data from Salt Lake City, Utah.

[0060] Table 1

[0061]

[0062]

[0063] Table 2

[0064]

[0065] From Table 1 and Table 2, the annual heating energy used for residential buildings is about: Q 加热 =29GJ, the annual cooling energy used for residential buildings is about: Q 冷却 = 82GJ.

example 2

[0066] Example 2 : Thermal energy storage scale of a family house (One Family House) (simplified calculation)

[0067] Can bear a typical family living room (150m 2 × 2 floors + basement) of the annual energy load of the soil cylinder (soil cylinder) size to calculate the energy recovery efficiency for underground thermal energy storage. This calculation uses the energy calculations from Example 1 (Q 冷却 =82×10 9 J, Q 加热 =29×10 9 J), and assuming the following properties of the soil column: η E =0.60, ΔT=15℃, H=10m, ρc P ≈2×10 6 J / m 3℃ (wet soil). Use the following equation:

[0068]

[0069] The resulting estimate R 冷却 is about 9.3m while R 加热 It is about 7.2m. This calculation demonstrates the feasibility of the structures described herein. Of course, the final scale will depend on the specific soil, environment and heating / cooling needs required.

example 3

[0071] As an example, the following 2D model was used to evaluate the performance of a set of 7 thermosiphons for frozen soil and the application of frozen soil as heat sink for air conditioning. Preliminary models of frozen and thawed water-soaked soils were created using the commercially available software package COMSOL Multiphysics 3.3. The geometric model chosen for the analysis was an array of six thermosyphons placed at the corners of a symmetrical hexagon with a seventh thermosyphon placed at the center of the hexagon. Taking advantage of the symmetry of the system, a quarter circle with a radius of 5 m was selected as the domain of interest. Three thermosyphons are modeled in this domain: one is positioned centrally, while the other two are arranged 60 degrees apart from one of them on the axis of symmetry. The distance between the thermosiphons is 1.5 meters. Only thermal conduction is modeled in this basic rendition.

[0072] Use the ambient temperature model for...

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Abstract

The invention provides systems and methods for cooling and / or heating a structure. Generally, a system for heating or cooling a structure can include at least one thermosiphon in thermal communication with a thermal storage material such as a volume of earth. The thermosiphon can be partially filled with a heat transfer fluid and a heat exchanger operatively connected to the thermosiphon which is in thermal communication with the structure. Thermal energy can be transferred between the thermal storage material and the structure in either a passive or assisted mode, depending on whether the system is charging or in use.

Description

technical field [0001] The present invention generally relates to ground-coupled / soil-sourced / ground-coupled thermosiphons. More specifically, the present invention relates to methods and systems for heating and cooling structures using ground-coupled thermosiphons. Accordingly, the present invention relates to the fields of geothermal engineering, thermodynamics and materials science. Background technique [0002] Heating / heating and air conditioning systems are in demand throughout the world, but are often energy-intensive and expensive. The cost of such systems is typically on the order of thousands of dollars for residential systems and even higher for commercial locations. In addition, they typically require large amounts of energy to achieve satisfactory performance, thereby increasing costs and further burdening society's energy burden. In general, heating and cooling costs can be as high as 75% of a building's total annual operating costs, and by some estimates as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B30/06F24J3/08F24J3/06F24V50/00
CPCF24J3/081F25B30/06Y02E10/12F24T10/10F24T2201/00F24T10/40Y02E10/10
Inventor K·S·乌代尔
Owner 犹他州立大学研究基金会
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