Role of latent heat storage in thermal performance of an axially grooved heat pipe. (1st December 2022)

• Record Type: Journal Article
• Authors: Zhang, Xuan; Zhang, Chengbin; Chen, Yongping
• Is Part Of: International journal of heat and mass transfer. Volume 198(2022)
• Publication Date: 2022-12-01
• Subjects: Heat pipe -- Phase change material -- Latent heat storage -- Groove -- Melting; AGHP Axially grooved heat pipe -- PCM phase change materials -- LHS latent heat storage -- THI temperature homogenization index -- TI thermostatic index -- non-LHS AGHPs without LHS units -- eva-LHS LHS units arranged at the evaporator section of the AGHP -- con-LHS LHS units arranged at the condenser section of the AGHP -- eva/con-LHS LHS units arranged at both the evaporator and condenser sections of the AGHP; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2022.123415
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: LHS is proposed to enhance thermal performance of AGHP under intermittent heating. Thermal performance of AGHPs with three LHS modes are experimentally investigated. Introduction of LHS unit into AGHP reduces the temperature of heat source by 27.4%. The presence of LHS unit greatly enhances the thermostat performance of an AGHP. Temperature homogenization of AGHP & LHS units becomes worse as heat load increases. Abstract: Heat pipe coupled with phase change material (PCM) based latent heat storage (LHS) is a significant thermal management system that can efficiently control the intermittent high heat loads of electronic devices. Herein, an axially grooved heat pipe-LHS (AGHP&LHS) system has been proposed. The influence of LHS units and their location on dynamic temperature response of AGHP has been investigated both experimentally and theoretically. The effect of filling rates of phase change materials (PCMs) as well as cooling temperature on thermal response of the AGHP has been compared and analyzed. Results indicate that the LHS effectively stabilizes the heat source temperature under the intermittent heating process, enhances the thermostat performance and brings the temperature uniformity in AGHP. In addition, LHS units arranged at the evaporator section are optimal for AGHP under intermittent heat load conditions, reducing the heat source temperature by 27.4% and prolonging the melting time by 81.5%. As the heat load increases, the melting time of AGHP&LHS system becomes shorter, and the overall temperature uniformity is worsened. In particular, the melting time is prolonged by 34.8% for AGHP&LHS system with PCM filling rate of 89% than that of 44% filling rate.