Mitsubishi Heavy Industries Technical Review
    Vol. 51 No. 2 (2014)   Air-Conditioning & Refrigeration
    Technical Papers

    EC series
    -The Optimum Controller for a Heat Source System that Consists of Centrifugal Chillers-

    SATOSHI NIKAIDO
    KENJI UEDA
    YOSHIE TOGANO
    MINORU MATSUO
    KOKI TATEISHI

    For energy saving of a heat source system, sophisticating the system control matters, along with improving the efficiency of a heat source. Due to the complexity of advanced system control that makes use of the performance features of a centrifugal chiller, however, challenges lie in actually deploying it. As such, in 2010, Mitsubishi Heavy Industries, Ltd. (MHI) developed and commercialized the heat source total control system "EC series," which comprehensively easily controls a heat source system. For this product, we developed advanced system control with a plain control algorithm using findings through research with a university, thereby enabling EC series to make significant energy savings. Field verification conducted in 2012 indicates that the system achieved 23%-more energy saving compared with an existing cutting-edge system. Valued for its technical advancement and achievements, EC series was awarded the "Minister's Prize, the Ministry of Economy, Trade and Industry" for electricity conservation in the product and business model category, in the "FY2013 Grand Prize for Excellence in Energy Efficiency and Conservation" contest.