Organic Rankine cycle system based on heat exchange of solar thermal collector and phase change material

Abstract

The invention discloses an organic Rankine cycle system based on heat exchange of a solar thermal collector and a phase change material. The organic Rankine cycle system comprises the solar thermal collector, a phase change material (PCM) thermal storage device, a pump A, an expansion machine, a generator, a condenser, a pump B and a pipeline network; the pipeline network is connected with the solar thermal collector, the PCM thermal storage device, the expansion machine and the condenser, and is provided with valves; and connecting ways between the solar thermal collector, the PCM thermal storage device, the expansion machine and the condenser are changed by closing and opening the valves to realize switchover of working modes. The organic Rankine cycle system replaces evaporators in anorganic Rankine cycle with the solar thermal collector and the PCM thermal storage device, and thus, the problem that heat transfer of the evaporators is irreversible is effectively solved, the net output power and the efficiency of the system are increased, and meanwhile, the stable operation of the system is further guaranteed.

Description

technical field [0001] The invention belongs to a solar energy organic Rankine cycle system, in particular to an organic Rankine cycle system based on solar heat collectors and phase change material heat exchange. Background technique [0002] Solar ORC is a new application relative to biomass, waste heat recovery or geothermal ORC. Since 1960, large-scale solar thermal plants have been developed. However, the ORC is a promising technology for low-temperature applications with an operating range between 100 °C and 200 °C, so combining solar technology with an ORC is a promising option. [0003] In addition, due to the intermittent and fluctuating nature of solar energy, the smooth operation of solar power generation systems is very difficult. To solve this problem, it is proposed to utilize thermal energy storage to provide a buffer for stable operation. Many researchers have proposed phase change materials (PCMs) as heat storage units for solar thermal power generation s...

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Problems solved by technology

[0004] However, simply embedding the PCM heat storage device into the solar organic Rankine cycle system still cannot solve the irreversible heat transfer of the organic Rankine cycle evaporator.

At the same time, the use of heat transfer fluid such as heat transfer fluid for heat exchange will increase the investment cost, and the pump that drives the flow of heat transfer fluid will also significantly reduce the net power output of small-scale solar ORC systems and reduce system efficiency.

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