Characteristics analysis of an exhaust thermoelectric generator system with heat transfer fluid circulation

2021 ◽  
Vol 304 ◽  
pp. 117896
Author(s):  
Yulong Zhao ◽  
Mingjie Lu ◽  
Yanzhe Li ◽  
Minghui Ge ◽  
Liyao Xie ◽  
...  
Inventions ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 14
Author(s):  
Messaoud Badache ◽  
Zine Aidoun ◽  
Parham Eslami-Nejad ◽  
Daniela Blessent

Compared to conventional ground heat exchangers that require a separate pump or othermechanical devices to circulate the heat transfer fluid, ground coupled thermosiphons or naturallycirculating ground heat exchangers do not require additional equipment for fluid circulation in theloop. This might lead to a better overall efficiency and much simpler operation. This paper providesa review of the current published literature on the different types of existing ground coupledthermosiphons for use in applications requiring moderate and low temperatures. Effort has beenfocused on their classification according to type, configurations, major designs, and chronologicalyear of apparition. Important technological findings and characteristics are provided in summarytables. Advances are identified in terms of the latest device developments and innovative conceptsof thermosiphon technology used for the heat transfer to and from the soil. Applications arepresented in a novel, well-defined classification in which major ground coupled thermosiphonapplications are categorized in terms of medium and low temperature technologies. Finally,performance evaluation is meticulously discussed in terms of modeling, simulations, parametric,and experimental studies.


2021 ◽  
Vol 335 ◽  
pp. 02009
Author(s):  
Sridhar Sripadmanabhan Indira ◽  
Chockalingam Aravind Vaithilingam ◽  
Ramsundar Sivasubramanian

In this study, the performance of the thermoelectric generator (TEG) modules in converting the excess photovoltaic (PV) temperature to electricity in a hybrid photovoltaic/thermoelectric (PV/TEG) generator system is investigated. A one-dimensional analytical heat transfer model for the hybrid PV/TEG with pin-fin based heat sink is developed in Engineering Equation Solver (EES) and simulated under tracking and non-tracking conditions. The solar irradiance collected by the PV/TEG system under tracking and non-tracking conditions was calculated using the Solar Emulator tool via TracePro software. The effect of varying solar radiation and a varying number of TEGs on PV temperature, PV output, and TEG output is evaluated using solar radiation on March 15, 2020, in the Jalan Taylor’s, Malaysia (3.0626° N, 101.6168° E). Finally, the optimum number of TEG modules required for maximum TEG power output in the hybrid PV/TEG system under tracking and non-tracking conditions is investigated and discussed. The maximum net PTEG is obtained for 336, 339, and 341 TEGs under no-tracking, single-axis, and dual-axis tracking conditions, respectively.


2013 ◽  
Vol 328 ◽  
pp. 831-835
Author(s):  
Wen Bo Fang

Microencapsulated phase change material (MPCM) suspension is a novel material which has functions as thermal energy storage medium and heat transfer fluid. Its physical characteristic is complicated so that little work been done on the characteristics of MPCM suspension has been published. So it is helpful for selection of new heat transfer form to analyze the characteristics of MPCM suspension. This paper investigates thermal physical characteristics of the MPCM suspension which comprise thermal properties DSC analysis, viscosity analysis and the suspension property analysis. The viscosity measurement and test analysis of MPCM suspension were also carried out to verify the theoretical analyses.


2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Guansheng Chen ◽  
Nanshuo Li ◽  
Huanhuan Xiang ◽  
Fan Li

It is well known that attaching fins on the tubes surfaces can enhance the heat transfer into and out from the phase change materials (PCMs). This paper presents the results of an experimental study on the thermal characteristics of finned coil latent heat storage unit (LHSU) using paraffin as the phase change material (PCM). The paraffin LHSU is a rectangular cube consists of continuous horizontal multibended tubes attached vertical fins at the pitches of 2.5, 5.0, and 7.5 mm that creates the heat transfer surface. The shell side along with the space around the tubes and fins is filled with the material RT54 allocated to store energy of water, which flows inside the tubes as heat transfer fluid (HTF). The measurement is carried out under four different water flow rates: 1.01, 1.30, 1.50, and 1.70 L/min in the charging and discharging process, respectively. The temperature of paraffin and water, charging and discharging wattage, and heat transfer coefficient are plotted in relation to the working time and water flow rate.


Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3298
Author(s):  
Gianpiero Colangelo ◽  
Brenda Raho ◽  
Marco Milanese ◽  
Arturo de Risi

Nanofluids have great potential to improve the heat transfer properties of liquids, as demonstrated by recent studies. This paper presents a novel idea of utilizing nanofluid. It analyzes the performance of a HVAC (Heating Ventilation Air Conditioning) system using a high-performance heat transfer fluid (water-glycol nanofluid with nanoparticles of Al2O3), in the university campus of Lecce, Italy. The work describes the dynamic model of the building and its heating and cooling system, realized through the simulation software TRNSYS 17. The use of heat transfer fluid inseminated by nanoparticles in a real HVAC system is an innovative application that is difficult to find in the scientific literature so far. This work focuses on comparing the efficiency of the system working with a traditional water-glycol mixture with the same system that uses Al2O3-nanofluid. The results obtained by means of the dynamic simulations have confirmed what theoretically assumed, indicating the working conditions of the HVAC system that lead to lower operating costs and higher COP and EER, guaranteeing the optimal conditions of thermo-hygrometric comfort inside the building. Finally, the results showed that the use of a nanofluid based on water-glycol mixture and alumina increases the efficiency about 10% and at the same time reduces the electrical energy consumption of the HVAC system.


2021 ◽  
Vol 11 (9) ◽  
pp. 4100
Author(s):  
Rasa Supankanok ◽  
Sukanpirom Sriwong ◽  
Phisan Ponpo ◽  
Wei Wu ◽  
Walairat Chandra-ambhorn ◽  
...  

Evacuated-tube solar collector (ETSC) is developed to achieve high heating medium temperature. Heat transfer fluid contained inside a copper heat pipe directly affects the heating medium temperature. A 10 mol% of ethylene-glycol in water is the heat transfer fluid in this system. The purpose of this study is to modify inner structure of the evacuated tube for promoting heat transfer through aluminum fin to the copper heat pipe by inserting stainless-steel scrubbers in the evacuated tube to increase heat conduction surface area. The experiment is set up to measure the temperature of heat transfer fluid at a heat pipe tip which is a heat exchange area between heat transfer fluid and heating medium. The vapor/ liquid equilibrium (VLE) theory is applied to investigate phase change behavior of the heat transfer fluid. Mathematical model validated with 6 experimental results is set up to investigate the performance of ETSC system and evaluate the feasibility of applying the modified ETSC in small-scale industries. The results indicate that the average temperature of heat transfer fluid in a modified tube increased to 160.32 °C which is higher than a standard tube by approximately 22 °C leading to the increase in its efficiency by 34.96%.


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