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Experimental investigation of a thermally integrated Carnot battery using a reversible heat pump/organic Rankine cycle: influence of system charge on performance of the reversible scroll compressor/expander and global performance.

Number: 2171

Author(s) : TASSENOY R., DUMONT O., LEMORT V., DE PAEPE M., LECOMPTE S.

Summary

Carnot batteries are considered a promising power-heat-power storage technology for mid- and large-scale applications. Recently, the use of dual-purpose thermal machines has been proposed in Carnot batteries. In such a system, a single unit acts as heat pump (HP, compressor operation) during charging or organic Rankine cycle (ORC, expander operation) during discharging. This configuration reduces the investment cost of the technology compared to traditional Carnot batteries using two separate machines. An experimental campaign has been performed on a small-scale (1 kWel) Carnot battery pilot plant using a single scroll compressor/expander. A wide range of operational conditions has been tested in both charging and discharging mode. The influence of the system charge on the obtainable working points in both operation modes has been discussed. It has been found that lower system charges are needed to run the system in HP-mode than in ORC-mode. At these low charges, increasing the charge in HP-mode has a positive influence on the system performance at higher source and sink temperatures. At the higher charges for ORC-mode, increasing the system charge has been found to have a positive effect on the start-up of the system in the studied operation range. Next to the qualitative discussion, the system and scroll machine has been studied quantitatively.

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  • Original title: Experimental investigation of a thermally integrated Carnot battery using a reversible heat pump/organic Rankine cycle: influence of system charge on performance of the reversible scroll compressor/expander and global performance.
  • Record ID : 30030504
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022/07/10

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