Comparative Analysis of Heat Transfer Characteristics of Conical Cavity Receivers With Different Heat Transfer Fluids

doi:10.12096/j.2096-4528.pgt.21096

Abstract

Abstract:

To explore the influence of heat transfer fluids on the heat transfer characteristics of solar receivers, the heat transfer characteristics of conical cavity receivers with supercritical CO₂ and compressed air as heat transfer fluids were compared and analysed by combining ray tracing and computational fluid dynamics method. Based on numerical simulation, the effects of cone angle, fluid inlet mass flow rate and inlet temperature on heat transfer performance of receivers were discussed. The results show that under the same working conditions, the outlet temperature of compressed air is higher than that of supercritical CO₂, but the corresponding receiver thermal efficiency and system photothermal conversion efficiency are lower. For the two heat transfer fluids, the system photothermal conversion efficiencies reach the optimal values with the cone angle of 4.12°. In the range of operating parameters studied, the outlet temperature of heat transfer fluids increase linearly with the increase of inlet temperature. Once the mass flow rate exceeds 0.04 kg/s, increasing the mass flow rate has little effect on improving the photothermal conversion efficiency of the system.

Key words: solar energy, receiver, supercritical CO₂, compressed air, heat transfer characteristics

CLC Number:

TK513

Ding WANG, Yuxuan CHEN, Hu XIAO, Yanping ZHANG. Comparative Analysis of Heat Transfer Characteristics of Conical Cavity Receivers With Different Heat Transfer Fluids[J]. Power Generation Technology, 2021, 42(6): 682-689.

Figures/Tables 13

Fig.1 Schematic diagram of cavity receiver and PDC system

Fig.2 Computational domain meshing

Tab. 1 Grid independence check

网格数量	出口温度/K	绝对误差/%
2 423 370	860.40	0.24
3 598 505	861.09	0.16
4 442 491	862.60	0.00
5 630 989	862.52	—

Fig.3 Comparison and verification of heat transfer simulation results

Fig.4 Heat flux distribution on outer wall of receiver coil tube

Tab. 2 Total energy absorbed by the cavity and optical efficiency under different cone angles

ϕ/(°)	Q_ab/W	η_op/%
0	10 387	88.21
4.12	10 347	87.88
8.23	10 318	87.62
12.35	10 308	87.54
16.46	10 293	87.42

Fig.5 Variation of HTF temperature along the centerline of the tube under different cone angles

Fig.6 Variations of heat losses of the receiver with different cone angles

Fig.7 Variations of receiver thermal efficiency and system photothermal conversion efficiency with different cone angles

Fig.8 Variations of heat losses of the receiver with different inlet mass flow rates

Fig.9 Variations of HTF outlet temperature and system photothermal conversion efficiency with different inlet mass flow rates

Fig.10 Variations of heat losses of the receiver with different inlet temperatures

Fig.11 Variations of HTF outlet temperature and system photothermal conversion efficiency with different inlet temperatures

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