A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental study on geothermal heat exchangers buried in diaphragm walls
Highlights ► Conducting the first field experiment of heat exchangers in diaphragm wall. ► Finding the difference between heat exchanger in diaphragm wall and in borehole. ► Investigating the influence of 4 factors on heat exchange rate in diaphragm wall.
Abstract To bury absorber tubes in diaphragm wall as heat exchanger is a new energy saving technology. This paper is dedicated to study this new technology based on the field experiment at Shanghai Museum of Nature History. By the experiment, the heat transfer performance of heat exchanger in diaphragm wall and its impact factors including heat exchanger type, water velocity, inlet water temperature and operation mode were investigated. The test results show that (i) the heat exchange rate of W-shaped heat exchanger reached to 66.3 and 73.7W/m for tube type (a) and (b) at the inlet temperature of 35°C, which are approximately 1.2–1.4 times higher than that of single U-shaped type (c); (ii) under the experimental condition, the reasonable water velocity is 0.6–0.9m/s; (iii) the exchange rate reached to 40.3, 66.3 and 85.0W/m at the inlet temperature of 32, 35 and 38°C, respectively, for tube type (a), every 1°C rise of inlet water will promote 15% heat exchange rate; (iv) in intermittent operation mode, the average heat exchange rate is 82.8W/m while 72.7W/m for continuous mode under the experimental condition, i.e., 14.7% higher than that in continuous mode.
Experimental study on geothermal heat exchangers buried in diaphragm walls
Highlights ► Conducting the first field experiment of heat exchangers in diaphragm wall. ► Finding the difference between heat exchanger in diaphragm wall and in borehole. ► Investigating the influence of 4 factors on heat exchange rate in diaphragm wall.
Abstract To bury absorber tubes in diaphragm wall as heat exchanger is a new energy saving technology. This paper is dedicated to study this new technology based on the field experiment at Shanghai Museum of Nature History. By the experiment, the heat transfer performance of heat exchanger in diaphragm wall and its impact factors including heat exchanger type, water velocity, inlet water temperature and operation mode were investigated. The test results show that (i) the heat exchange rate of W-shaped heat exchanger reached to 66.3 and 73.7W/m for tube type (a) and (b) at the inlet temperature of 35°C, which are approximately 1.2–1.4 times higher than that of single U-shaped type (c); (ii) under the experimental condition, the reasonable water velocity is 0.6–0.9m/s; (iii) the exchange rate reached to 40.3, 66.3 and 85.0W/m at the inlet temperature of 32, 35 and 38°C, respectively, for tube type (a), every 1°C rise of inlet water will promote 15% heat exchange rate; (iv) in intermittent operation mode, the average heat exchange rate is 82.8W/m while 72.7W/m for continuous mode under the experimental condition, i.e., 14.7% higher than that in continuous mode.
Experimental study on geothermal heat exchangers buried in diaphragm walls
Xia, Caichu (author) / Sun, Meng (author) / Zhang, Guozhu (author) / Xiao, Suguang (author) / Zou, Yichuan (author)
Energy and Buildings ; 52 ; 50-55
2012-03-07
6 pages
Article (Journal)
Electronic Resource
English
Experimental study on geothermal heat exchangers buried in diaphragm walls
| Online Contents | 2012
Heat transfer model and design method for geothermal heat exchange tubes in diaphragm walls
| Online Contents | 2013