Abstract
Some of the heat sources (such as e.g. waste or renewable), are characterized by floating thermal and output characteristics. Thus, their application for powering vapor power plants, such as ORCs, which should utilize the heat sources having steady thermal and output characteristics is difficult. The floating heat source characteristics may potentially be improved using the heat storage devices providing the thermal energy accumulation at stable output and temperature level. Heat storage device can be adopted as a e.g. steady-level heat source for ORC system. In this paper different applications of the heat storage devices in ORCs were proposed and the results of experiments on powering the ORC system via heat storage device are presented. The results showed that adopting the heat storage devices for powering the ORC systems is possible and it is a promising way of utilizing the waste and renewable heat sources featuring floating characteristics.
Highlights
One of the problems connected with the use of the selected renewable and waste heat sources is their periodic appearance and floating characteristics of the heat source power, heat carrying medium output and temperature
The experimental investigations were carried out using a prototype of combined heat and power (CHP) ORC system adopting multi-vane expander
If the valves at the inlet and at the outlet of the evaporator are closed, heated water is closed in the shell of the evaporator and the evaporator can be treated as a heat storage device
Summary
One of the problems connected with the use of the selected renewable and waste heat sources is their periodic appearance and floating characteristics of the heat source power, heat carrying medium output and temperature. Floating characteristics of the heat source including its power, output and heat carrying medium temperature causes difficulties in their usage They must be utilized directly at the time of their appearance. The issues related to the recovery of this heat and the design of energy systems utilizing such heat sources are complex What is more, these energy systems have to adapt to changing conditions of the heat supply. In terms of the operating conditions of vapour power systems the direct application of the heat sources featuring floating thermal and output characteristics for their powering may be difficult.
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