PYONGYANG, Nov. 7 (Xinhua) -- The State Academy of Sciences of the Democratic People's Republic of Korea (DPRK) says it has developed a better way to recycle waste heat, according to official news agency KCNA on Saturday.

    The Academy’s Heat Engineering Research Institute said the new technology recovered the heat energy of waste gas from heating furnaces' boilers and reused it in a combustion process.

    "It's a practical energy," a researcher said. "It also raises the efficiency of heat producers and heat exchangers."

    Existing waste heat recovering devices such as multi-tubular and tubular heat exchangers had not been widely used due to their low efficiency and high production cost, said the researcher. But now the institute had successfully developed a new kind of heat exchanger by combining the multi-tubular with the tubular exchangers, and the new combination heat exchanger could heat air to 200-350 degrees centigrade.

    Currently, factories using the new combination heat exchanger in heating furnaces were all satisfied with the results.