Energy improvement and performance prediction of desiccant coated dehumidifiers based on dimensional and scaling analysis

Chen, W.D.; Vivekh, P.; Liu, M.Z.; Kumja, M.; Chua, Kian Jon

doi:10.1016/j.apenergy.2021.117571

Cited by 21 publications

(4 citation statements)

References 37 publications

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“…The power consumption and the required time for the humidity changes were recorded in the microcontroller. After collecting the data, the Savitzky-Golay filter was applied to remove the noise from the data [31]. The data was then stored on the microcontroller as CSV file format.…”

Section: Temperature and Humidity Sensor And Actuator Interfacementioning

confidence: 99%

“…A suspension-type small-sized dehumidifier is preferred over a traditional big-sized dehumidifier within a medium-sized greenhouse for several compelling reasons. Initially, the passive construction of a suspension-type dehumidifier allows it to be conveniently hung at an elevated position within the greenhouse [31]. This positioning takes advantage of the natural tendency of humid air to rise, effectively capturing moisture where it is most concentrated, near the canopy level where plants transpire the most.…”

Section: Introductionmentioning

confidence: 99%

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Layout of Suspension-Type Small-Sized Dehumidifiers Affects Humidity Variability and Energy Consumption in Greenhouses

Gulandaz,

Kabir,

Kabir

et al. 2024

Horticulturae

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In greenhouse management, maintaining optimal humidity is essential for promoting plant growth, including photosynthesis, and preventing diseases and pests. Addressing spatial variability requires sensor-based monitoring for informed decisions on humidification systems, particularly for small, and suspension-type dehumidifiers. This study aims to assess the impact of various layouts of small-sized suspension-type dehumidifiers on vertical, spatial, and temporal humidity variability, along with energy consumption in a greenhouse. During experiments in a 648 m³ (18 m × 6 m × 6 m) plastic greenhouse, dehumidifiers were placed at four different layouts: one at the center (layout 1), one on each side (layout 2), two units at the center facing opposite directions (layout 3), and two units on one side facing the center (layout 4). Temperature and humidity (TH) sensors were connected to a microcontroller, facilitating wireless data acquisition, storage, and remote monitoring. The actuator was controlled through a relay module, and current sensors monitored power consumption. Spatial interpolation and mapping were employed using mapping software. These layouts reduced humidity from 89.30% to 51.10%, with Layout 2 displaying the most consistent humidity distribution. Water removal efficiency varied among layouts, with layout 2 exhibiting the highest (61.15 L) and overall performance of 50%, while layouts 1, 3, and 4 exhibited lower efficiencies of 40%, 44%, and 49%, respectively. Power consumption ranged from 0.506 to 0.528 kW for the dehumidifier and 0.242 to 0.264 kW for the fan. The findings highlighted that positioning the dehumidifier on both sides, facing towards the center (Layout 2), resulted in the most uniform humidity control within the greenhouse. The optimal layout of small suspension-type dehumidifiers in greenhouses would significantly improve humidity control, promoting plant growth.

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Section: Temperature and Humidity Sensor And Actuator Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Layout of Suspension-Type Small-Sized Dehumidifiers Affects Humidity Variability and Energy Consumption in Greenhouses

Gulandaz,

Kabir,

Kabir

et al. 2024

Horticulturae

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“…(c) Desiccant dehumidifier Thermal-driven desiccant dehumidifiers remove moisture from humid air, resulting in a significant energysaving performance of cooling systems [37]. Figure 16 shows a schematic diagram of a solid desiccant coated heat exchanger dehumidifier system.…”

Section: Recovering Waste Heat To Generate Electricity (A) Organic Ra...mentioning

confidence: 99%

Sustainable energy recovery from thermal processes: a review

2022

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Background With the increasing concerns on the energy shortage and carbon emission issues worldwide, sustainable energy recovery from thermal processes is consistently attracting extensive attention. Nowadays, a significant amount of usable thermal energy is wasted and not recovered worldwide every year. Meanwhile, discharging the wasted thermal energy often causes environmental hazards. Significant social and ecological impacts will be achieved if waste thermal energy can be effectively harnessed and reused. Hence, this study aims to provide a comprehensive review on the sustainable energy recovery from thermal processes, contributing to achieving energy security, environmental sustainability, and a low-carbon future. Main text To better understand the development of waste thermal energy utilization, this paper reviews the sustainable thermal energy sources and current waste energy recovery technologies, considering both waste heat and cold energy. The main waste heat sources are prime movers, renewable heat energy, and various industrial activities. Different waste heat recovery technologies to produce electricity, heating, and cooling are analyzed based on the types and temperatures of the waste heat sources. The typical purposes for waste heat energy utilization are power generation, spacing cooling, domestic heating, dehumidification, and heat storage. In addition, the performance of different waste heat recovery systems in multigeneration systems is introduced. The cold energy from the liquified natural gas (LNG) regasification process is one of the main waste cold sources. The popular LNG cold energy recovery strategies are power generation, combined cooling and power, air separation, cryogenic CO2 capture, and cold warehouse. Furthermore, the existing challenges on the waste thermal energy utilization technologies are analyzed. Finally, potential prospects are discussed to provide greater insights for future works on waste thermal energy utilization. Conclusions Novel heat utilization materials and advanced heat recovery cycles are the key factors for the development of waste high-temperature energy utilization. Integrated systems with multiply products show significant application potential in waste thermal energy recovery. In addition, thermal energy storage and transportation are essential for the utilization of harnessed waste heat energy. In contrast, the low recovery rate, low utilization efficiency, and inadequate assessment are the main obstacles for the waste cold energy recovery systems.

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“…The supply air humidity to the prototype-scale cooler was maintained at around 11.0 g/kg while other parameters (temperature, velocity and working air ratio) were individually adjusted. The large-scale cooler was tested at two humidity conditions (ambient and dehumidified), which were controlled via an in-line dehumidifier installed before the cooler [52]. When the supply air velocity and working air ratio were adjusted, dehumidified air was used for testing the large-scale cooler.…”

Section: Dew-point Evaporative Cooler Performancementioning

confidence: 99%