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Experimental and numerical investigation of discharging process of direct contact thermal energy storage for use in conventional air-conditioning systems.pdf
Applied Energy 189 (2017) 211–220
Contents lists available at ScienceDirect
Applied Energy
journal homepage: /locate/apenergy
Experimental and numerical investigation of discharging process of direct contact thermal energy storage for use in conventional air-conditioning systems
Xiao-Yan Li ?, Dong-Qi Qu, Liu Yang, Kai-Di Li
School of Energy and Building Engineering, Harbin University of Commerce, No. 1 Xuehai Street, Songbei District, Harbin, Heilongjiang 150028, China
highlights
The discharging process of a direct contact TES system with a new PCM is modeled. Effects of HTF ?ow rate and inlet temperature on discharging process are clari?ed. A novel PCM with higher latent heat for conventional air-conditioning system is prepared. An experimental direct-contact TES system is designed and built. Good agreement is observed between simulation results and experimental data.
article info
Article history: Received 24 August 2016 Received in revised form 22 November 2016 Accepted 25 November 2016 Available online 22 December 2016
Keywords: Latent heat thermal energy storage Phase change material Discharging characteristics Experimental measurements Direct contact heat transfer Conventional air-conditioning system
abstract
Direct contact thermal energy storage (TES) for use in conventional air-conditioning systems is proposed to reduce the operational energy demand. Thermal performance of a novel kind of phase change material (PCM) prepared for use in conventional air-conditioning systems with the proposed direct contact TES tank, is evaluated. A 3-dimensional (3D) numerical model is built using ANSYS FLUENT to investigate dynamic characteristics of the discharging process of TES system. The model is validated by comparing the numerical with the experimental results. The effects of heat transfer ?uid (HTF) ?ow rate, HTF inlet temperature, liquid PCM volume fraction, complete discharging time, discharging capacity of the tank, and temperature distribution in direct
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