Abstract
It is known that drag reducing additive reduce turburent friction drag and heat transfer in tube flow simultaneously. Then, the reducing chracteristics of drag and heat transfer of surfactant(Ethoquard 0/12) solution flow in the finned-tube heat exchanger (pipe di. 9.3mm) for air-conditioning were measured in the experimental room controlled temperature and humidity, before field test. The following results were obtained. (1)As cooling, it was not showed the reducing chracteristics of drag and heat transfer. Conversely, it was showed the increasing chracteristics of drag. (2)As heating, the reducing chracteristics of drag and heat transfer depended on the type of heat exchanger.
