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NUMERICAL SIMULATION OF BOREHOLE HEAT TRANSFER WITH PHASE CHANGE MATERIAL AS GROUT Jinlong Wang1, Jingde Zhao1*, Ni Liu2 1Donghua University, 2999, North People’s Road, Shanghai 201620, China 2University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China *corresponding author: zhaojingde@dhu.edu.cn Keywords: ground source heat pump, ground heat exchanger, phase change materials, thermal energy storage, numerical simulation.
In this paper, phase change materials (PCMs) are used as grout instead of common materials.
Three models employ soil, phase change materials, and heat transfer enhanced phase change materials as grout respectively.
Here, phase change material is the mixture of n-decanoic acid and lauric acid (DLC) as 7:3.
In this paper, the phase change materials are employed as grout.

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Experimental design The polymer modified cement concrete (abbreviated as PMC) is composed of cementing materials including polymer and cement.
Taking this into consideration, first we select host materials and modified materials composing PMC to try mixing traces of samples and then screen among them.
Acknowledgements This work was partly supported by Natural Science Foundation of China (Grants No. 50809079) and Science & Technology Project of Chongqing Educational Committee (Grants No.
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For example, choosing either deep color or rough surface materials is helpful to building energy-conserving.
It is appropriate to select those external decorative materials with smaller coefficient to absorb solar radiation in hot areas
It is appropriate to select external decorative materials with the bigger absorption coefficient to solar radiation in cold district.
Acknowledgment This reserch is supported by Hebei Province Natural Science Foundation(E2008000519).
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The type and properties of the grouting materials contribute great impact on the grouting effect.
Maintaining the materials ratio unchanged, test was carried out by changing the amount of water reducer for comparison.
By testing different materials, the material requirements of the new grout were determined and the results are showed in Table4.
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Fibres glass are the most used reinforcing materials.
These materials are able to reuse waste glass fibers.
A solution regarding the recycling of waste composite materials is grinding of these materials and creating products that are embedded.
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