Features and characteristics of low-grade heat storage for organic Rankine cycle

Nowadays, different waste heat sources from industrial processes, renewables, and other heat sources of low thermal potential (e.g., ocean thermal energy) are considered to be utilized in power generation. In the manufacturing process, the waste heat is likely low temperature and to exploit it, the installation of the heat storage systems tends to be necessary. Not only hot sources, but the waste heat may also refer to the potential of cold sources. Organic Rankine Cycle (ORC) systems employing the volumetric expanders (e.g., screw, multi-vane, scroll, and piston expanders) as prime movers appear to be one of the suitable technologies that could be integrated with heat storage systems and applied for power generation. Literature reviews show that heat storage has been practically implemented in the process of liquefied natural gas (LNG) in a regasification system. Also, there are several concepts of possible configurations of heat storage devices. However, there is a lack of experimental and modelling research concerning this heat storage system applied in low-grade energy ORC. In this paper, the discussion of modelling and analysing heat storage devices combined with ORC is reported. Obtained modelling results show that a hot storage evaporator (HSE) and a cold storage condenser (CSC) as the integration of heat storage devices in ORC systems seems to be a promising solution to utilize low-temperature heat sources because they could serve both as heat storages and heat source characteristic regulators. Since the advantages of its function, the modelling of ORC system operating conditions for different types of heat storage devices was carried out. The result shows that scenario keeping stability in the operating temperature range of the ORC system is essential concerning the charging and discharging times that has to be taken into consideration in the main design stage before fabricating HSE and CSC.     «

Nowadays, different waste heat sources from industrial processes, renewables, and other heat sources of low thermal potential (e.g., ocean thermal energy) are considered to be utilized in power generation. In the manufacturing process, the waste heat is likely low temperature and to exploit it, the installation of the heat storage systems tends to be necessary. Not only hot sources, but the waste heat may also refer to the potential of cold sources. Organic Rankine Cycle (ORC) systems employing...     »