Effects of working fluids on the performance of a bi-directional thermodiode for solar energy utilization in buildings

Chun, Wongee; Ko, Yung Joo; Lee, H.J.; Han, Hee-Jeong; Kim, J.T.; Chen, K.

doi:10.1016/j.solener.2008.09.001

Cited by 35 publications

(18 citation statements)

References 14 publications

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“…Thermal management is a common issue in several applications including cryogenics, [ 10–12 ] energy conversion, [ 13–15 ] caloric refrigeration, [ 16–18 ] microfluidics, [ 19–21 ] biology, chemistry, and pharmacy, [ 22–24 ] buildings, [ 25–28 ] outer space, [ 11,29,30 ] and sensor technologies. [ 31,32 ] Therefore, TCDs for these application areas are being studied theoretically and experimentally.…”

Section: Introductionmentioning

confidence: 99%

Fluidic and Mechanical Thermal Control Devices

Klinar

Swoboda

Rojo

et al. 2020

Adv Elect Materials

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In recent years, intensive studies on thermal control devices have been conducted for the thermal management of electronics and computers as well as for applications in energy conversion, chemistry, sensors, buildings, and outer space. Conventional cooling or heating techniques realized using traditional thermal resistors and capacitors cannot meet the thermal requirements of advanced systems. Therefore, new thermal control devices are being investigated to satisfy these requirements. These devices include thermal diodes, thermal switches, thermal regulators, and thermal transistors, all of which manage heat in a manner analogous to how electronic devices and circuits control electricity. To design or apply these novel devices as well as thermal control principles, this paper presents a systematic and comprehensive review of the state‐of‐the‐art of fluidic and mechanical thermal control devices that have already been implemented in various applications for different size scales and temperature ranges. Operation principles, working parameters, and limitations are discussed and the most important features for a particular device are identified.

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Section: Introductionmentioning

confidence: 99%

Fluidic and Mechanical Thermal Control Devices

Klinar

Swoboda

Rojo

et al. 2020

Adv Elect Materials

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“…There are some examples of AOF built within the research environment to test experimentally their performance. At facade component level, researchers produced prototypes which controlled the thermal heat transfer, such as the prototype of a Removable Insulation component [53], a Close Loop Dynamic Insulation (see Figure 3) [63], a Permeodynamic wall [64], or a Bi-directional Thermodiode component [65]. The last two components were also assessed in calibrated test cells [39][40][41][42][43].…”

Section: Adaptive Opaque Facades: An Innovative Concept Born In the Rmentioning

confidence: 99%

Development and Validation of a Roadmap to Assist the Performance-Based Early-Stage Design Process of Adaptive Opaque Facades

et al. 2020

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Adaptive Opaque Facades (AOF) is an innovative concept with potential to achieve low carbon energy buildings. However, so far AOF are not integrated in the construction industry. One remarkable issue that designers have when dealing with alternative low-carbon technologies, such as AOF, is the absence of previous built experiences and the lack of specialised technical knowledge. Design roadmaps can be convenient solutions to guide pioneer low carbon technology applications. This work presents a roadmap to assist the performance-based early-stage design process of Adaptive Opaque Facades. Previous research developed new approaches and tools to assist on the construction definition of AOF, so that their adaptive thermal performance was considered when specific design decisions needed to be made. The roadmap presented in this paper organises the implementation sequence of each methodological approach and tools in different design stages, which aims to provide a holistic design approach for AOF. The usability of the roadmap was validated in a workshop called “Performance-based Design and Assessment of Adaptive Facades” with master students representing the target group of this roadmap. Even though these students had never heard about AOF before, they could successfully design, define the early-stage characteristics of an AOF and quantify the thermal performance of their AOF designs. The roadmap was proven to be a useful support, which might make the implementation of AOF more approachable in the future.

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“…[ 1 ] In contrast, phase‐change thermal diodes can achieve substantive diodicities of η ≈ 10–100 by leveraging the immense latent heat of vaporization exclusively in the forward mode. [ 4,14,15 ] Current types of phase‐change thermal diodes include thermosyphons, [ 15–19 ] asymmetric heat pipes, [ 5,15,20–22 ] or jumping‐droplet vapor chambers, [ 2,3,14,23,24 ] which are all hampered by various shortcomings as will now be discussed.…”

Section: Introductionmentioning

confidence: 99%

“…Thermosyphons are vertically oriented hollow containers partially filled with liquid. [ 15,17–19,25 ] In the forward mode of operation, steam ascends by buoyant convection and condenses at the top of the container. The condensate then slides back to the bottom reservoir by gravity, enabling continuous phase‐change heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Bridging‐Droplet Thermal Diodes

Edalatpour

Murphy

Mukherjee

et al. 2020

Adv Funct Materials

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Phase-change thermal diodes effectively transport heat unidirectionally, but are currently constrained by either a gravitational dependence, a 1D configuration, or poor durability. Here, a novel bridging-droplet thermal diode which uniquely bypasses all of these existing constraints is developed. The diode is comprised of two opposing copper plates separated by an insulating gasket of micrometric thickness; one plate contains a superhydrophilic wick structure while the other is smooth and hydrophobic. In the forward mode of operation, water evaporates from the heated wicked plate and condenses on the hydrophobic plate. The large contact angle of the dropwise condensate enables bridging across the gap to replenish the wicked evaporator, providing sustained phase-change heat transfer. Conversely, in the reverse mode, the heat source is now on the hydrophobic plate, resulting in dryout and excellent thermal insulation across the gap. An orientation-independent heat transfer ratio (i.e., diodicity) as high as 85 was measured.

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Effects of working fluids on the performance of a bi-directional thermodiode for solar energy utilization in buildings

Cited by 35 publications

References 14 publications

Fluidic and Mechanical Thermal Control Devices

Fluidic and Mechanical Thermal Control Devices

Development and Validation of a Roadmap to Assist the Performance-Based Early-Stage Design Process of Adaptive Opaque Facades

Bridging‐Droplet Thermal Diodes

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