Soil thermal conductivity prediction for district heating pre-insulated pipeline in operation

Perpar, M.; Rek, Zlatko; Bajric, Suvad; Žun, Iztok

doi:10.1016/j.energy.2012.06.037

Cited by 29 publications

(20 citation statements)

References 11 publications

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“…The thermal diffusivity ranges on average from 0.04 to 0.1 m 2 /day. In addition, most researchers have used different values of thermal diffusivity in their work [14,17,18,[26][27][28][29].…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical Investigation of Ground Cooling Potential for Malaysian Climate

Yusof

Anuar²,

Hassan³

2014

Int. J. Automot. Mech. Eng.

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In equatorial countries like Malaysia, the cooling of buildings is almost entirely dependent on air-conditioning, with electricity as the main source of the energy required. As the country develops, with more buildings being built, and as the population grows, with more people demanding thermal comfort in the buildings they work and live in, the rate of electricity consumption for cooling purposes will continue to increase dramatically from year to year. This phenomenon requires the application of alternative energy options and thermal storage. Ground thermal storage is an example of thermal storage which can supply cooling and heating effects resulting in a significant reduction of electricity consumption. This paper discusses the potential of the implementation of ground thermal storage by using a ground heat exchanger (GHE) to supply passive cooling for any application. An analysis has been conducted based on an empirical equation from conduction heat transfer for depths of up to 30 m and thermal diffusivities from 0.04 to 0.1 m 2 /day. The main input parameters were obtained from a local weather station for three consecutive years. The result showed that a significant reduction occurs at a depth of 2.0 m and below, meaning that cooling can be supplied constantly throughout the year. The temperature amplitude is also attenuated relatively with depth, whereby amplitudes of less than 1 °C occur at a depth of more than 4 m with a thermal diffusivity of 0.04 m 2 /day. In addition, thermal diffusivity gives a significant increment in temperature amplitude and it is suggested to be maintained at a value of less than 0.06 m 2 /day. This result provides useful information to researchers and engineers in the field of underground installation of materials or systems such as gas pipelines, water supply and for underground cable transmittance.

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Section: Mathematical Modelmentioning

confidence: 99%

Numerical Investigation of Ground Cooling Potential for Malaysian Climate

Yusof

Anuar²,

Hassan³

2014

Int. J. Automot. Mech. Eng.

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“…These applications are the most effective for passive energy sources from the ground which easily meet the heating and cooling requirement of buildings. The GHE is also used for district heating in some countries [15,16]. Performance of the GHE strongly depends on the air inlet temperature and the pipe wall temperature which in turn depends on the ground temperature variation.…”

Section: Introductionmentioning

confidence: 99%

A Review of Ground Heat Exchangers for Cooling Application in the Malaysian Climate

2015

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The ground heat exchanger (GHE) is one of the energy sources that has been identified since the 1970s which is able to produce sustainable energy for cooling which is in passive side. GHEs are widely implemented around the world, especially in European countries and a few Asian countries. In Malaysia, application of GHE is still considered as a new passive cooling approach in building energy reduction. Therefore, this paper reviews several important ways of implementing GHE in order to supply passive cooling for any application. The review covers general implementation of the GHE for thermal comfort and agricultural greenhouse cooling. The ground temperature variation used in different researches is also reviewed in this paper as an important part of identifying potential GHE implementations. Design and performance aspects of the GHE are also reviewed. Finally, this paper summarizes the potential and benefit of GHE implementation in the Malaysian climate for cooling applications to reduce the energy used in buildings and greenhouse gas emission.

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“…The influence of soil is not as obvious as the insulation. Thermal conductivity of soil varies between 0.5 W/(m•K) and 2.5 W/(m•K) subjecting to the composition, structure and moisture content [85]. Higher thermal conductivity results in bigger heat loss.…”

Section: Underground Depth and Soil Conductivitymentioning

confidence: 99%

District heating and cooling optimization and enhancement – Towards integration of renewables, storage and smart grid

Liu

Rezgui

Zhu

2017

Renewable and Sustainable Energy Reviews

127

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Optimization and Enhancement of DHC networks to reduce (a) fossil fuel consumption, CO 2 emission, and heat losses across the network, while (b) increasing return on investment, forming key challenges faced by decision makers in the fast developing energy landscape. While the academic literature is abundant of research based on field experiments, simulations, optimization strategies and algorithms etc., there is a lack of a comprehensive review that addresses the multi-faceted dimensions of the optimization and enhancement of DHC systems with a view to promote integration of smart grids, energy storage and increased share of renewable energy. The paper focuses on four areas: energy generation, energy distribution, heat substations, and terminal users, identifying state-of-the-art methods and solutions, while paving the way for future research.

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Soil thermal conductivity prediction for district heating pre-insulated pipeline in operation

Cited by 29 publications

References 11 publications

Numerical Investigation of Ground Cooling Potential for Malaysian Climate

Numerical Investigation of Ground Cooling Potential for Malaysian Climate

A Review of Ground Heat Exchangers for Cooling Application in the Malaysian Climate

District heating and cooling optimization and enhancement – Towards integration of renewables, storage and smart grid

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