Thermal Comfort of the Sports/Leisure Clothing with the Heat Storage/Reflection Function : Wearing Evaluation under the Condition of 0±1℃ and 50±5% RH

The application of phase change materials (PCMs) has been verified as an effective strategy for improving energy efficiency and reducing greenhouse gas emissions. Biocomposite PCMs (Bc-PCM) exhibit large latent heat, chemical stability, and a wide temperature range. In this study, thermal conductivity improved Bc-PCM (TBc-PCM) was made via vacuum impregnation with graphene nanoplatelets (GNPs). Chemical stability analysis and thermal performance analyses of the Bc-PCM and TBc-PCM were carried out as well as building energy simulations and thermal comfort analyses. Our results show Bc-PCM showed a higher heat storage capacity and enthalpy value compared to TBc-PCM. TBc-PCM exhibited a 378% increase in thermal conductivity compared to Bc-PCM. Building energy simulation results revealed that annual heating and cooling energy consumption decreased as the thickness of the PCM layer increased. In addition, the Bc-PCM with a larger PCM capacity was more effective in reducing energy consumption during the heating period. On the other hand, the cooling energy reduction effect was greater when TBc-PCM with high thermal conductivity was applied because of the high heat transfer during the cooling period. Thermal comfort evaluation revealed it was more comfortable when PCM was applied.

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Thermal comfort and energy saving of novel heat-storage coatings with microencapsulated PCM and their application

Energy and Buildings ◽

10.1016/j.enbuild.2021.111349 ◽

2021 ◽

pp. 111349

Author(s):

Xiaoyun Zhu ◽

Xinxin Sheng ◽

Jun Li ◽

Ying Chen

Keyword(s):

Thermal Comfort ◽

Energy Saving ◽

Heat Storage

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Autoclaved aerated concrete: Influence of heat storage capacity on thermal performance and thermal comfort

ce/papers ◽

10.1002/cepa.827 ◽

2018 ◽

Vol 2 (4) ◽

pp. 97-102

Author(s):

Tim Schöndube ◽

Saif Rashid ◽

Svenja Carrigan ◽

Torsten Schoch ◽

Oliver Kornadt

Keyword(s):

Thermal Comfort ◽

Thermal Performance ◽

Storage Capacity ◽

Heat Storage ◽

Autoclaved Aerated Concrete ◽

Aerated Concrete

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Comfort simulation supported sketch plan optimization of the University of Pécs, Medical School extension

Pollack Periodica ◽

10.1556/606.2020.15.2.15 ◽

2020 ◽

Vol 15 (2) ◽

pp. 166-177

Author(s):

Dóra Noémi Zetz ◽

István Kistelegdi

Keyword(s):

Medical School ◽

Thermal Comfort ◽

Heat Storage ◽

Internal Heat ◽

Design Stage ◽

Thermal Mass ◽

Plan Optimization ◽

Sketch Plan ◽

The University ◽

The Impact

Abstract:During sketch design stage for the new block of the University of Pécs, Medical School comfort and lighting simulations were applied to quantify optimization strategies. Simulation cases about shading possibilities, façade glazing ratios and internal heat storage masses evaluate the impact of illumination, solar gains, loads and heat transmission on visual and thermal comfort. The goal was to select the most favorable comfort, coupled with maximum reduction of investment costs. Concepts represent 14% (shading), 10% (reduced wall-window ratio), 11% (slabs without suspended ceilings), and 17% (combined wall-window ratio and thermal mass) improvement in thermal comfort performance, and it was proposed for further design.

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Autoclaved aerated concrete: Influence of heat storage capacity on thermal performance and thermal comfort

Mauerwerk ◽

10.1002/dama.201800019 ◽

2018 ◽

Vol 22 (5) ◽

pp. 297-304

Author(s):

Tim Schöndube ◽

Saif Rashid ◽

Svenja Carrigan ◽

Torsten Schoch ◽

Oliver Kornadt

Keyword(s):

Thermal Comfort ◽

Thermal Performance ◽

Storage Capacity ◽

Heat Storage ◽

Autoclaved Aerated Concrete ◽

Aerated Concrete

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Thermal Response Characteristics of Intermittently Cooled Room with Tube-Embedded Cooling Slab and Optimization of Intermittent Control

Energies ◽

10.3390/en13071568 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1568

Author(s):

Xuemin Sui ◽

Huajiang Wang ◽

Ming Qu ◽

Huitao Liu

Keyword(s):

Energy Efficiency ◽

Thermal Comfort ◽

Heat Storage ◽

Thermal Environment ◽

Cooling System ◽

Peak Load ◽

Thermal Response ◽

Cooling Capacity ◽

Intermittent Control ◽

Control Schemes

The heat storage effect of the tube-embedded slab cooling system (TESCS) makes the intermittent operation feasible, a reasonable intermittent strategy can fully realize the energy saving effect. This paper purposes to optimize the intermittent control schemes for TESCS by simulation. The response of the thermal environment intermittently cooled by TESCS is firstly studied. Then, the intermittent control schemes of TESCS are studied. On the basis of the dual-objective optimization for thermal comfort and energy efficiency, the optimal scheme is established. The results show that the tube-embedded slab has significant heat storage and release characteristics under intermittent cooling condition. Its maximum cooling capacity appears about one hour after the stop of cooling. Reducing the cooling duration can reduce the system energy consumption, but increasing the cooling duration can reduce the system peak load. Twenty-four-hour cooling can reduce the peak load by about 70%, 67%, and 41%, respectively, compared with 6-h, 8-h, and 12-h cooling. The effect of the cooling duration on the thermal comfort and energy efficiency is much greater than the cooling time distribution. Frequent starts and stops of the pump can increase the cooling capacity obtained by the room to a certain extent. Daytime cooling provides higher comfort and energy efficiency while night cooling can reduce the chiller’s peak cooling requirement by about 25%.

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Integration of PCMs and Capillary Radiant Cooling/Heating to Ensure of Thermal Comfort

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1041.350 ◽

2014 ◽

Vol 1041 ◽

pp. 350-353 ◽

Cited By ~ 1

Author(s):

Tomáš Klubal ◽

Milan Ostrý

Keyword(s):

Thermal Comfort ◽

Phase Change ◽

Latent Heat ◽

Building Materials ◽

Phase Change Materials ◽

Heat Storage ◽

Operating Cost ◽

Storage Medium ◽

Latent Heat Storage ◽

Radiant Cooling

The thermal comfort of buildings occupants depends on the physical properties of applied building materials, on the solar heat gains through the transparent part of the external envelope and the mode of heating/cooling and ventilation. Capillary radiant cooling / heating can maintain a state of indoor environment in the required temperature range in accordance with legislative framework. The paper shows possibility how to improve thermal comfort and thermal stability in summer.Presented system uses phase change materials as a latent heat storage medium for better absorption of heat. Microencapsulated phase change materials Micronal® DS 5040 X and DS 5008X were used as latent heat storage medium in combination with gypsum plaster. Activation of phase change materials is carried out by capillary tubes with cooled / heated water circuit. At Institute of Building Structures at Faculty of Civil Engineering are located two rooms for comparative measurements. There were located thermal storage modules in the experimental room. Low- temperature radiant cooling and heating with phase change materials are one of the ways to reduce energy consumption and operating cost for cooling / heating. The paper presents the results of measurements for different modes of operation of cooling and heating.

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Electron microscopy of niobium and tantalum hydrides

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100110362 ◽

1978 ◽

Vol 36 (1) ◽

pp. 644-645

Author(s):

T. Schober

Keyword(s):

Electron Microscopy ◽

Heat Storage ◽

Measurement Techniques ◽

Metal Hydrides ◽

Detailed Understanding ◽

Storage Devices ◽

Unit Cells ◽

Endothermic Reactions ◽

Hydrogen Reactions ◽

New Phase

Nb, Ta and V are prototype substances for the study of the endothermic reactions of H with metals. Such metal-hydrogen reactions have gained increased importance due to the application of metal-hydrides in hydrogen- und heat storage devices. Electron microscopy and diffraction were demonstrated to be excellent methods in the study of hydride morphologies and structures (1). - Figures 1 and 2 show the NbH and TaH phase diagrams (2,3,4). EM techniques have contributed substantially to the elucidation of the structures and domain configurations of phases β, ζ and ε (1,4). Precision length measurement techniques of distances in reciprocal space (5) recently led to a detailed understanding of the distortions of the unit cells of phases ζ and ε (4). In the same work (4) the existence of the new phase η was shown. It is stable near -68 °C. The sequence of transitions is thus below 70 %.

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