Field operation of a 125 kW ORC with ship engine jacket water
Session: Poster session & Welcome drinks
Session starts: Wednesday 13 September, 17:30
Christopher Sellers (Calnetix Technologies, LLC.)
Improving ship system efficiency is a growing concern for the marine industry. New regulations imposed by the International Maritime Organization (IMO) have set efficiency targets for new and existing ships. These targets are outlined in the energy efficiency design index (EEDI) and will reach a maximum of 30% by 2025. In order to satisfy the regulations, ship owners are exploring new methods to improve the efficiency of existing systems. One such method is to capture and repurpose engine waste heat.
Many ships employ exhaust steam boilers to recover heat from engine exhaust. This represents a source of high quality heat (≥ 200°C). At these temperatures, it is relatively easy to extract thermal energy. In contrast, low quality heat sources, such as engine jacket water (≤ 100°C), have been largely ignored. Steam production is impractical at such low temperatures. A new technology was needed to take advantage of low temperature heat sources on the ship.
Calnetix Technologies, in conjunction with Mitsubishi Heavy Industries (MHI), developed an Organic Rankine Cycle (ORC) specifically designed to utilize engine jacket water as a heat source. The first prototype was successfully built, tested, and certified by Lloyd's Registry (LR) and Nippon Kaiji Kyokai (NK) in March 2015 (Yuksek 2015.) The system generates up to 125 kW from a heat source with temperature range 80°C to 95°C.
This prototype was installed, commissioned, and placed into service on the Arnold Maersk container ship in April 2016. This paper will discuss difficulties which arose during the installation. It will also present and discuss data collected by the ORC's sensors during its first several months of operation. Finally benefits of the ORC operation in conjunction with auxiliary ship systems will be explained.