Improving the thermal efficiency of a solar dryer using phase change materials at different position in the collector

Today, due to the reduction of energy resources in the world and its pollutants, energy storage methods and increase the thermal efficiency of various systems are very important. In this research, the thermal efficiency and energy storage of two heat exchangers have been investigated in series using phase change materials (RT82) and single wall carbon nanotubes (SWCNT) and graphene quantum dot nanoparticles (GQD) In this research, two heat exchangers have been used in combination. The first heat exchanger was in charge of storing thermal energy and the second heat exchanger was in charge of heat exchange. The reason for this is to improve the heat exchange of the main exchanger (shell and tube) by using heat storage in the secondary exchanger, which has not been addressed in previous research. The results of this study showed that using two heat exchangers in series, the thermal efficiency of the system has increased. Also, the heat energy storage of the double tube heat exchanger was obtained using phase change materials in the single-walled carbon nanotube composition of about 3000 W. The average thermal efficiency of the two heat exchangers as the series has increased by 52%. In general, the effect of the two heat exchangers on each other was investigated in series with two approaches (energy storage and energy conversion) using fin and nanoparticles, which obtained convincing results.

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Experimental investigations of a solar dryer with and without multiple phase change materials (PCM’s)

World Journal of Engineering ◽

10.1108/wje-06-2016-028 ◽

2016 ◽

Vol 13 (3) ◽

pp. 210-217 ◽

Cited By ~ 3

Author(s):

T.S. Sreerag ◽

K.S. Jithish

Keyword(s):

Energy Storage ◽

Melting Point ◽

Phase Change ◽

Phase Change Materials ◽

Drying Process ◽

Absorber Plate ◽

Content Type ◽

Air Heater ◽

Multiple Phase ◽

Solar Dryer

Purpose This paper aims to present a comparative study of a solar dryer with and without multiple phase change materials (PCMs). It also involves designing and fabricating the experimental model of an indirect solar dryer which uses PCMs for thermal energy storage. Design/methodology/approach A corrugated aluminium sheet is used as an absorber plate. Aluminium pipes of 0.75 inch are welded under the corrugated sheet to store the PCM. Here, multiple PCMs are used – one with a high melting point and the other with a low melting point for the purpose of improving efficiency. A single air pass model in which air moves over the absorber plate is used for the study. Air is heated in an air heater section which also contains thermal energy storage. The energy obtained in the air heater section is first used to heat and melt the PCM. Findings Thus, heat energy is stored into the PCM and then the heated air moves into the drying chamber in which drying take place. When the sun’s insolation reduces, discharging from the PCM takes place. Thus, it reduces the fluctuation in the energy and provides continuous energy to the system. Glass wool is used as an insulation material. Different parameters for this air heater-dryer have been calculated. Originality/value The current study enhances the understanding of solar drying process and the developed model with and without multiple phase change materials can be used for optimising the drying process.

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Thermal efficiency analysis of buildings with phase change materials.

Sustainability Agri Food and Environmental Research ◽

10.7770/safer-v10n1-art2577 ◽

2021 ◽

Vol 10 (1) ◽

Author(s):

Shabana M Thaha ◽

Bennet Kuriakose ◽

Rajesh Baby

Keyword(s):

Phase Change ◽

Construction Industry ◽

Indoor Air ◽

Thermal Efficiency ◽

Building Materials ◽

Phase Change Materials ◽

Construction Material ◽

Building Model ◽

Simulation Process ◽

Ceiling Height

Increasing global temperature is alarming the need for construction industry to have thermally efficient building materials. Incorporating Phase Change Materials (PCM) in buildings is widely accepted method for reduction in temperature, thereby achieving better thermal efficiency. This paper focuses on the assessment of thermal performance of PCM-incorporated building under tropical climatic condition. The simulation process was carried out using Design Builder Software and the developed building model is validated with the results available in the literature. A parametric study is also performed in order to identify the effect of different parameters like building orientation, window to wall ratio, ceiling height and construction material on the indoor air temperature. The results showed that the maximum reduction was up to 2.76°C. Keywords- Thermal Efficiency, Tropical climate, PCM

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Optimal forecasting of thermal conductivity and storage in parabolic trough collector using phase change materials

Journal of Engineering Research ◽

10.36909/jer.v9i2.7706 ◽

2021 ◽

Vol 9 (2) ◽

Author(s):

P. Muruganantham ◽

◽

Balaji Dhanapal ◽

Keyword(s):

Solar Energy ◽

Phase Change ◽

Heat Loss ◽

Thermal Efficiency ◽

Phase Change Materials ◽

Storage System ◽

Solar Collectors ◽

Parabolic Trough ◽

Fluid Medium ◽

Parabolic Trough Collector

Renewable energy is one of the cleaner energy generation strategies practiced all over the world to reduce environmental impacts and waste based on current sustainability in economic practices. Solar energy is one kind of renewable sources of energy practiced for different application. The thermal storage system in solar energy is one of the least practiced methods in research, and the utilization of solar energy in the thermal application is attaining higher responses and is quite possible. In this paper, solar heat generation is attained by solar parabolic trough collector using phase change materials. The ideology behind this research is to develop a thermal energy storage system using solar collectors and phase change materials. A composition mixture of MgCl2. 6H2O phase change materials used as the fluid medium in trough collector and thermal efficiency of the material is evaluated. For effective optimization, an imperialist competitive algorithm is used for optimizing the thermal efficiency of the solar collectors. The thermal efficiency of the collector is numerically experimented in the running platform of Mat Lab and executed in terms of heat gain, heat loss, and thermal efficiency of the parabolic trough collector, respectively. The efficiency of the proposed framework is 85%, and the current framework just has 80% efficiency. The heat loss in the proposed framework is lower than that of the current system, distinguished as 4200 W and 4520 W, respectively. It is shown from the research study that the proposed PCM composition is an optimal method for generating heat energy in solar parabolic trough collectors.

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A Brief Review on Nano Phase Change Material-Based Polymer Encapsulation for Thermal Energy Storage Systems

Springer Proceedings in Energy - Energy and Sustainable Futures ◽

10.1007/978-3-030-63916-7_3 ◽

2021 ◽

pp. 19-26

Author(s):

Muhammad Aamer Hayat ◽

Yong Chen

Keyword(s):

Thermal Conductivity ◽

Energy Storage ◽

Phase Change ◽

Thermal Energy ◽

Thermal Energy Storage ◽

Thermal Efficiency ◽

Phase Change Materials ◽

Polymer Encapsulation ◽

Heat Transfer Efficiency ◽

High Heat Transfer

AbstractIn recent years, considerable attention has been given to phase change materials (PCMs) that is suggested as a possible medium for thermal energy storage. PCM encapsulation technology is an efficient method of enhancing thermal conductivity and solving problems of corrosion and leakage during a charging process. Moreover, nanoencapsulation of phase change materials with polymer has several benefits as a thermal energy storage media, such as small-scale, high heat transfer efficiency and large specific surface area. However, the lower thermal conductivity (TC) of PCMs hinders the thermal efficiency of the polymer based nano-capsules. This review covers the effect of polymer encapsulation on PCMs while concentrating on providing solutions related to improving the thermal efficiency of system.

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