Investigation of service performance of casing pipe in thermal well environment and its application to critical design of thermal wells
Eiji TsuruFujimasa KohyamaYoichi YazakiSyuichi TakesueMasao OgasawaraKazushi MaruyamaShunji NishiHisamitsu Miyoshi
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Abstract Based on the thermal process control, rapid welding technology for polyethylene pipes with built-in heater in the open air at temperatures below standard is proposed. Technological parameters of welding are determined by calculation from the condition of temperature field dynamics in heat-affected zone according to regularities, that are peculiar to welding at permissible temperatures. The results of determining the welding parameters during electrofusion welding and welding of the saddle branch to the polyethylene pipe of the gas pipeline, as well as the results of tests of the joints obtained by the proposed welding technology are presented.
Electrogas welding
Explosion welding
Plastic welding
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Abstract Ground source heat pump technology is widely used in buildings’ to meet the cooling and heating demand. As a special form of the buried pipe, diaphragm wall has received increasing interests due to high energy-efficiency and relatively low costs. Previous studies investigated the thermal behavior of diaphragm wall in underground tunnels or underground parking while very few studies were carried out on deep-buried engineering with the air-conditioned adjacent indoor environment. In this study, the effects of buried pipes on the heat transfer regulation of the diaphragm wall and the indoor load are analyzed. Simulation results indicated that average energy exchange through the pipe in the diaphragm wall is 78.1% compared with that of the conventional buried pipe for the ground heat pump. The heat exchange capacity of the buried pipe in the diaphragm wall in intermittent mode is 1.2 times of that in the non-intermittent mode in 14h. For the underground engineering boundary with pipes buried in the concrete layer, heat transfer through the inner surface reduced 3.8W/m 2 , which would consequently add to the indoor cooling load. In order to reduce the heat transfer back to the indoor environment through the inner surface, insulation of the diaphragm wall are analyzed. This study can provide a reference for the analysis of the feasibility and application of diaphragm wall in deep-buried engineering.
Diaphragm (acoustics)
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Thermal bridge
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