Test analysis of soil-air heat exchangers for ventilation and cooling of pig farms in Chongqing

Aiming at the current ventilation and cooling problems of large-scale pig farms, sets up a set of soil-air heat exchanger test bench for ventilation and cooling of pig houses in summer. Tests the performance of the heat exchanger pipes with a length of 30 m and three diameters of DN110, DN160 and DN200 under the conditions of variable air speed and variable air volume for 24 hours. The test results show that the average temperature drop range of DN110, DN160 and DN200 pipe is 8.1 to 13.0 ℃,7.2 to 8.7 ℃ and 6.0 to 7.7 ℃, respectively, and the average total heat transfer is 288.1 to 578.9 W, 291.8 to 2 267.1 W and 332.4 to 509.2 W, respectively. The average total heat transfer of DN160 pipe is 548.3 W under the continuous operation for 6 days and the air flow rate in the tube of 4.06 m/s.