Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Sensitivity analysis and optimization

Gao, Xiangkui; Yuan, Yanping; Cao, Xiaoling; Wu, Hongwei; Zhao, Xudong

doi:10.1016/j.psep.2017.03.005

Cited by 28 publications

(12 citation statements)

References 20 publications

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“…In refuge chambers, the air temperatures might be higher than 30°C, and the RH is between 70% and 90%. 6,8 It should also be noted that the majority of measured levels of CO 2 in these buildings were below 5000 ppm. Therefore, the higher CO 2 concentration on physiological responses and cognitive performance might have been ignored.…”

Section: Introductionmentioning

confidence: 94%

“…For example, CO 2 concentrations in underground coal mine refuges can reach as high as 25 000 ppm 4 or even 30 000 ppm. 5 It should also be noted that these spaces could become hot and humid when in use, [6][7][8] and occupants do not have access to daylight or views, owing to poor lighting conditions. In addition, changes in the light, heat, and CO 2 concentrations of underground confined spaces can cause psychological fluctuations that induce nervousness, depression, and restlessness.…”

Section: Introductionmentioning

confidence: 99%

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Human responses to high levels of carbon dioxide and air temperature

Song

et al. 2020

Indoor Air

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In this study, 30 subjects were exposed to different combinations of air temperature (T a : 24, 27, and 30°C) and CO 2 level (8000, 10 000, and 12 000 ppm) in a high-humidity (RH: 85%) underground climate chamber. Subjective assessments, physiological responses, and cognitive performance were investigated. The results showed that as compared with exposure to T a = 24°C, exposure to 30°C at all CO 2 levels caused subjects to feel uncomfortably warm and experience stronger odor intensity, while increased mental effort and greater intensity of acute health symptoms were reported.However, no significant effects of T a on task performance or physiological responses were found. This indicated that subjects had to exert more effort to maintain their performance in an uncomfortably warm environment. Increasing CO 2 from 8000 to 12 000 ppm at all T a caused subjects to report higher rates of headache, fatigue, agitation, and feeling depressed, although the results were statistically significant only at 24 and 27°C. The text typing performance and systolic blood pressure (SBP) decreased significantly at this exposure, whereas diastolic blood pressure (DBP) and thermal discomfort increased significantly. These effects suggest higher arousal/ stress. No significant interaction effect of T a and CO 2 concentration on human responses was identified.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Human responses to high levels of carbon dioxide and air temperature

Song

et al. 2020

Indoor Air

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“…All the existing cooling systems have some limitations in regard to controlling the temperature increase. To address these problems, a coupled cooling system, which couples precooling with PCMs of an envelope, was proposed . As shown in Figure a, the envelope is precooled using forced air, and the PCM is embedded in a wall or chair to store the cold during times of peace.…”

Section: Application Of Solid–liquid Pcms In An Lhtes Systemmentioning

confidence: 99%

Latent Heat Thermal Energy Storage Systems with Solid–Liquid Phase Change Materials: A Review

Zhang¹,

Yuan²,

Cao³

et al. 2018

Adv Eng Mater

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365

108

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This paper provides a review of the solid-liquid phase change materials (PCMs) for latent heat thermal energy storage (LHTES). The commonly used solid-liquid PCMs and their thermal properties are summarized here firstly. Two major drawbacks that seriously limit the application of PCMs in an LHTES system, that is, low thermal conductivity and liquid leakage, are discussed. Various methods for enhancing the thermal conductivity and heat transfer of solid-liquid PCMs are explained. Previous studies regarding formstable composite PCMs and microencapsulated PCMs are also presented. Furthermore, applications of the solid-liquid PCMs used in LHTES and thermal management systems are introduced and analyzed. Finally, future outlooks and research topics are proposed.

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“…8 Thus, TESMs play a crucial part in thermal energy storage systems, including thermal management application. 9,10 Finding new TESMs has become more and more important. Phase change materials (PCMs) are a good choice for thermal energy storage systems because the PCMs have high energy storage density and can storage energy in isothermal process.…”

Section: -5mentioning

confidence: 99%

Graphene-decorated silica stabilized stearic acid as a thermal energy storage material

Xie

Chen

2017

RSC Adv.

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Novel thermal energy storage materials were synthesized from graphene-decorated silica (SG) and stearic acid (SA) by vacuum impregnation method. Three kinds of SG (SG 1 , SG 5 , and SG 10 ) were prepared by decorating silica with different contents of graphene and were then used to stabilize SA to prepare SA/ SG 1 , SA/SG 5 , and SA/SG 10 composites. The structures and thermal energy storage performances of the SA/SG composites were investigated. It is of interest that the thermal energy storage behaviors of the SA/ SG composites were dramatically changed with different contents of graphene, presenting more than one endothermal or exothermal peak in the differential scanning calorimetry (DSC) curves while pure SA had only one. The SA in SA/SG 1 and SA/SG 5 showed higher crystallinity (F c , 84.44% and 84.39%) and greater effective energy storage per unit mass (E ef , $150 J g À1 ) than that of SA in SA/SG 10 . These thermal energy storage behaviors and properties were revealed to be related to the pore structures of the SG.The thermal stability of the SA/SG composites was analyzed by a thermogravimetric analyzer (TGA), and the SA/SG composites have good thermal stability. Addition of graphene was beneficial to the enhancement in thermal conductivity of the SA/SG composite, which could reach 0.90 W m, and 1.12 W m À1 K À1 for SA/SG 1 , SA/SG 5 , and SA/SG 10 , respectively; and were 246%, 304%, and 331% higher than pure SA, respectively. SA/SG 5 has potential for application in thermal energy storage, especially in thermal gradients due to it having both high E ef and thermal conductivity.

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Coupled cooling method and application of latent heat thermal energy storage combined with pre-cooling of envelope: Sensitivity analysis and optimization

Cited by 28 publications

References 20 publications

Human responses to high levels of carbon dioxide and air temperature

Human responses to high levels of carbon dioxide and air temperature

Latent Heat Thermal Energy Storage Systems with Solid–Liquid Phase Change Materials: A Review

Graphene-decorated silica stabilized stearic acid as a thermal energy storage material

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