Session: 09-05 Energy Storage Based on CO2

Paper Number: 124448

124448 - Thermodynamic Analysis of a Novel Transcritical CO2 Pumped Thermal Energy Storage System With a Vortex Tube Driven by Photovoltaic Thermal Collector 

As the proportion of renewable energy utilization increases globally, the technology of energy storage gains extensive interest in recent years. Pumped thermal energy storage (PTES) is s a highly versatile storage option which is not restricted by any geographical constraints. To enhance the roundtrip efficiency of PTES, this paper proposed a PTES system based on the transcritical CO₂ cycle. Furthermore, the proposed system is combined with photovoltaic thermal (PV/T) collectors to improve the coefficient of performance (COP) during the energy storage process by recovering the waste heat of PVT collectors. PV/T can not only improve the power efficiency of photovoltaic, but also increase the inlet temperature of compressor to reduce the energy consumption. Considering the low critical temperature (about 31℃) of CO₂, the vortex tube is utilized in the proposed system to condense CO₂ to liquid under ambient conditions, so that the proposed system can be more flexible in the process of application. A mathematical model is established to analyze the parametric effects on thermodynamic and economic performances under different operating conditions. The sensitivity analysis of key parameters such as temperature of storage tank and condensation temperature is conducted under different operating conditions to find out the energy storage characteristics of the proposed system. In addition, multi-objective optimization by means of a genetic algorithm is carried out to obtain the optimal design performances such as round-trip efficiency, energy density and levelized cost of electricity (LCOE).

Presenting Author: Liangqi Chen Xi'an Jiaotong University

Presenting Author Biography: 2015-2018 Xi 'an Jiaotong University M.Sc
2022 to now Xi 'an Jiaotong University PhD Student

Authors:

Liangqi Chen Xi'an Jiaotong University
Juwei Lou Xi'an Jiaotong University
Bofeng Wang Xi'an Jiaotong University
Jiangfeng Wang Xi'an Jiaotong University
Pan Zhao Xi'an Jiaotong University
Yiping Dai Xi'an Jiaotong University