Experimental investigation on the improvement of cooling and dehumidification of a direct-expansion terminal integrated with flat heat pipe

Zhao, Hengxin; Wu, Yunyi; Lin, Borong; Sun, Hongli

doi:10.1016/j.enbuild.2022.111922

Cited by 10 publications

(2 citation statements)

References 43 publications

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“…Zhao et al [140] developed a novel direct-expansion terminal by combining the FHP and ASHP for improving the cooling and dehumidification of the traditional radiant cooling terminals (as shown in Figure 56). Experimental tests were conducted to evaluate the performance of the new cooling terminal.…”

Section: Cooling Radiator Integrated With Hpmentioning

confidence: 99%

The Review of the Application of the Heat Pipe on Enhancing Performance of the Air-Conditioning System in Buildings

Yuan,

Liu,

Zhang

et al. 2023

Processes

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An air-conditioning system (ACS), which consumes large amounts of high-grade energy, is essential for maintaining the indoor thermal environment of modern buildings. However, an ACS consumes almost half of the total energy of the building. Therefore, it is necessary to reduce the energy consumption of the ACS to promote energy conservation and emission reduction in the building sector. In fact, there is an abundance of waste heat and low-grade energies with the potential to be utilized in ACS in nature, but many of them are not utilized efficiently or cannot be utilized at all due to the low efficiency of thermal energy conversion. Known as a passive thermal transfer device, the application of a heat pipe (HP) in the ACS has shown explosive growth in recent years. HPs have been demonstrated to be an effective method for reducing building cooling and heating demands and energy consumption in ACS with experimental and simulation methods. This paper summarizes the different HP types applied in the ACS and provides brief insight into the performance enhancement of the ACS integrated with HP. Four types of HPs, namely tubular HP (THP), loop HP (LHP), pulsating HP (PHP) and flat HP (FHP), are presented. Their working principles and scope of applications are reviewed. Then, HPs used in natural cooling system, split air conditioner (SAC), centralized ACS (CACS) and cooling terminal devices are comprehensively reviewed. Finally, the heat transfer characteristics and energy savings of the above systems are critically analyzed. The results show that the performance of the HP is greatly affected by its own structure, working fluid and external environmental conditions. The energy saving of ACS coupled with HP is 3–40.9%. The payback period of this system ranges from 1.9–10 years. It demonstrates that the HP plays a significant role in reducing ACS energy consumption and improving indoor thermal comfort.

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Section: Cooling Radiator Integrated With Hpmentioning

confidence: 99%

The Review of the Application of the Heat Pipe on Enhancing Performance of the Air-Conditioning System in Buildings

Yuan,

Liu,

Zhang

et al. 2023

Processes

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“…The novel system had a higher moisture removal rate in comparison to the conventional system, with an improvement of 28-134%. Zhao et al [10] developed a novel direct-expansion terminal by combining a flat heat pipe and an air-source heat pump. The indoor humidity ratio experienced a change of between 2.8 and 7.9 g/kg after dehumidification, and the indoor relative humidity could be reduced to a comfortable range within 30 min.…”

Section: Introductionmentioning

confidence: 99%

An Anti-Condensation Radiant Heating Floor System in Buildings under Moistening Weather

Liang

Lan

et al. 2023

Sustainability

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In most regions of southern China, condensation frequently occurs on building surfaces during the period from March to April. This phenomenon has been affecting people’s safety and structural properties. This article proposes an innovative anti-condensation floor system based on the reverse Carnot cycle. The evaporation side treats the air and reduces the moisture content, and the heat extracted from the condensation side is recovered by a heat exchanger and transferred to the floor through capillary mats. Simulation studies of the dynamic operation performance have been conducted through the TRNSYS 18 software. The results show that an innovative anti-condensation floor system can effectively keep the floor dry in Guilin. At the same time, regarding the indoor comfort level index, the PMV value is within ±0.5, and the energy consumption of the system is 42% less than that of the cooling dehumidification system. The system also performs well in representative cities where the air moisture content is less than 12 g/kg. This article also provides a reference for the feasibility of radiant floor systems in humid climate areas.

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Heat dissipation mechanism of the thermosyphon electric knitting needle

Xia,

Zhang

2024

J Mech Sci Technol

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Experimental investigation on the improvement of cooling and dehumidification of a direct-expansion terminal integrated with flat heat pipe

Cited by 10 publications

References 43 publications

The Review of the Application of the Heat Pipe on Enhancing Performance of the Air-Conditioning System in Buildings

The Review of the Application of the Heat Pipe on Enhancing Performance of the Air-Conditioning System in Buildings

An Anti-Condensation Radiant Heating Floor System in Buildings under Moistening Weather

Heat dissipation mechanism of the thermosyphon electric knitting needle

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