Journal
APPLIED THERMAL ENGINEERING
Volume 50, Issue 1, Pages 26-34Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2012.04.062
Keywords
Thermal energy storage; Phase change material; PCM; Latent heat storage; Direct-contact; Heat exchange
Funding
- project CO2 Ultimate Reduction in Steel making process by innovative technology for cool Earth 50 of the New Energy and Industrial Technology Development Organization, Japan
- Grants-in-Aid for Scientific Research [10J02940] Funding Source: KAKEN
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This paper describes the development and performance of a direct-contact heat exchanger using erythritol (melting point: 391 K) as a phase change material (PCM) and a heat transfer oil (HTO) for accelerating heat storage. A vertical cylinder with 200-mm inner diameter and 1000-mm height was used as the heat storage unit (HSU). A nozzle facing vertically downward was placed at the bottom of the HSU. We examined the effects of flowrate and inlet temperature of the HTO using three characteristic parameters of heat storage - difference between inlet and outlet HTO temperatures, temperature effectiveness, and heat storage rate. The temperature history of latent heat storage (LHS) showed three stages: sensible heat of solid PCM, latent heat of PCM, and sensible heat of liquid PCM. Further, the operating mechanism of the DCHEX was proposed to explain the results. The average heat storage rate during LHS was proportional to the increase in flowrate and inlet temperature of HTO. Thus, latent heat can be rapidly stored under large HTO flowrate and high inlet temperature in the DCHEX. (c) 2012 Elsevier Ltd. All rights reserved.
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