Experimental study of a thin water-film evaporative cooling system to enhance the energy conversion efficiency of a thermoelectric device

Zheng, Liang Jun; Lim, Sungmook; Kim, Na Kyong; Kang, Dong Hee; Youn, Young Jik; Lee, Wonoh; Kang, Hyun Wook

doi:10.1016/j.energy.2020.119040

Cited by 12 publications

(2 citation statements)

References 28 publications

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“…However, exceeding a specific current range, which varies depending on the TEM's material properties, has no additional cooling effect but does increase Joule heating, reducing the TEM's cooling capacity [10]. To increase the coefficient of performance (COP) of TEM used in building cooling applications, researchers combined many methods, such as solar powered TEM [11,12], evaporative cooling [13,14], and thermal energy storage [15,16]. Integration of these additional system increases complexity and overall cost of the configuration [17].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, in order to improve the performance of the TEMs in a hassle-free manner, limited studies were carried out by changing the electric pulse settings to further decrease Sustainability 2021, 13, 9682. https://doi.org/10.3390/su13179682 https://www.mdpi.com/journal/sustainability Sustainability 2021, 13, 9682 2 of 13 cold side temperature of TEMs below the temperature achieved during steady-state conditions [18,19]. This is referred to as the super cooling effect, and it occurs when a current many times greater is applied across TEMs for a specified period, resulting in a rapid decrease in the cold end temperature [20].…”

Section: Introductionmentioning

confidence: 99%

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Performance Improvement of Thermoelectric Air Cooler System by Using Variable-Pulse Current for Building Applications

Irshad

2021

Sustainability

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The thermoelectric air conditioning system (TE-AC) is a small, noiseless alternative to standard vapor compression refrigeration (VCR) systems. The cooling characteristics of a TE-AC system operating under two conditions, i.e., steady current and current pulses, are investigated in this study. This system consists of three thermoelectric modules, a heat sink, and an air circulation fan. The result shows that maximum temperature reduction in cooling side of TE-AC system was achieved at 6 A input current under steady state operation. The optimum performance of the TE-AC system under steady state operation depends upon the combined effect of the cooling load, Joule, Fourier, and Peltier heat. In TE-AC pulse operation, both current width and cooling load applied on the cold side of the thermoelectric module (TEMs) play an important role in achieving optimum cooling performance of the system. When normal input current operation (i.e., no current pulse) was compared to pulse-operated TE-AC system operation, it was found that pulse operation provides an additional average temperature reduction of 3–4 °C on the cold side of TEMs. Although on the hot side, it maintains a temperature in the range of 18 °C to 24 °C to reduce overshoot heat flux. The duration of operation is also important in determining pulse width and pulse amplitude. Minimum and overshoot peak temperature rises during each cycle for longer run operation. In the TE-AC system, the accumulated Joule heat during a current pulse frequently causes a temperature overshoot, which lasts much longer. As a result, the next current pulse was not released until the temperature of TE was restored to its initial value.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Improvement of Thermoelectric Air Cooler System by Using Variable-Pulse Current for Building Applications

Irshad

2021

Sustainability

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Evaporative cooling promotion using macroporous hydrogels with stable water transport and evaporation path

Tadano,

Cho,

Yamazaki

et al. 2024

J of Applied Polymer Sci

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Evaporative cooling is being re‐evaluated in the context of eco‐systems and environmental friendliness to improve the efficiency of thermoelectric and photovoltaic power generation. One of the essential tasks to improve evaporative cooling performance is the development of materials that can maintain the evaporation path and supply the lost water. Here, we synthesized a macroporous hydrogel by freeze casting at a slow cooling rate. A series of open spaces was designed between the aligned columns of the hydrogel, and water is stably supplied by extensive capillary channels. In a cooling test, it was shown to be effective in reducing the target's equilibrium temperature. As the heat input increased, the cooling effect (that is, the temperature reduction by the hydrogels) tended to increase. In addition, under airflow, the effect was stable, and further enhanced. These results extend design strategies for hydrogel‐based evaporative cooling and offer opportunities to maximize cooling performance by searching for optimal surface shape and exploiting airflow conditions.

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A passive evaporative cooling strategy to enhance the electricity production of hybrid PV-STEG system

Gao,

Wu,

Dai

et al. 2023

Applied Energy

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Experimental study of a thin water-film evaporative cooling system to enhance the energy conversion efficiency of a thermoelectric device

Cited by 12 publications

References 28 publications

Performance Improvement of Thermoelectric Air Cooler System by Using Variable-Pulse Current for Building Applications

Performance Improvement of Thermoelectric Air Cooler System by Using Variable-Pulse Current for Building Applications

Evaporative cooling promotion using macroporous hydrogels with stable water transport and evaporation path

A passive evaporative cooling strategy to enhance the electricity production of hybrid PV-STEG system

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