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.
