Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Development of a ground-source heat pump system with ground heat exchanger utilizing the cast-in-place concrete pile foundations of buildings
Ground-source (geothermal) heat pump (GSHP) systems can achieve a higher coefficient of performance than conventional air-source heat pump (ASHP) systems. However, GSHP systems are not widespread in Japan because of their expensive boring costs. The authors have developed a GSHP system that uses the cast-in-place concrete pile foundations of a building as heat exchangers to reduce the initial boring cost. In this system, some U-tubes are arranged around the surface of a cast-in-place concrete pile foundation. The heat exchange capability of this system, subterranean temperature changes, and heat pump performance were investigated in a full-scale experiment. As a result, the average values for heat rejection were 186-201 W/m (per pile, 25 W/ m per pair of tubes) while cooling. The average COP (coefficient of performance) of this system was 4.89 while cooling, rendering this system about 1.7 times more effective in energy-saving terms than the more typical ASHP systems. The initial cost of construction per unit for heat extraction and rejection is US dollar 0.79/W (approximately yen 79/W)for this system, whereas it is US dollar 3/W (yen 300/W) for existing standard borehole systems. Therefore, this system is expected to be commercially viable.
Development of a ground-source heat pump system with ground heat exchanger utilizing the cast-in-place concrete pile foundations of buildings
Ground-source (geothermal) heat pump (GSHP) systems can achieve a higher coefficient of performance than conventional air-source heat pump (ASHP) systems. However, GSHP systems are not widespread in Japan because of their expensive boring costs. The authors have developed a GSHP system that uses the cast-in-place concrete pile foundations of a building as heat exchangers to reduce the initial boring cost. In this system, some U-tubes are arranged around the surface of a cast-in-place concrete pile foundation. The heat exchange capability of this system, subterranean temperature changes, and heat pump performance were investigated in a full-scale experiment. As a result, the average values for heat rejection were 186-201 W/m (per pile, 25 W/ m per pair of tubes) while cooling. The average COP (coefficient of performance) of this system was 4.89 while cooling, rendering this system about 1.7 times more effective in energy-saving terms than the more typical ASHP systems. The initial cost of construction per unit for heat extraction and rejection is US dollar 0.79/W (approximately yen 79/W)for this system, whereas it is US dollar 3/W (yen 300/W) for existing standard borehole systems. Therefore, this system is expected to be commercially viable.
Development of a ground-source heat pump system with ground heat exchanger utilizing the cast-in-place concrete pile foundations of buildings
Entwicklung eines geothermischen Wärmepumpensystems mit Boden-Wärmetauschern unter Verwendung der am Ort gegossenen Betonsäulen-Fundamente von Gebäuden
Sekine, Kentaro (Autor:in) / Ooka, Ryozo (Autor:in) / Yokoi, Mutsumi (Autor:in) / Shiba, Yoshiro (Autor:in) / Hwang, SuckHo (Autor:in)
2007
9 Seiten, 5 Quellen
Aufsatz (Konferenz)
Englisch
| British Library Conference Proceedings | 2007
| British Library Online Contents | 2007
| British Library Conference Proceedings | 2005