Method to control an air conditioner by directly measuring the relative humidity of indoor air to improve the comfort and energy efficiency

Lim, dae kyu; Ahn, Byoung Ha; Jeong, Ji Hwan

doi:10.1016/j.apenergy.2018.02.004

Cited by 34 publications

(12 citation statements)

References 34 publications

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“…Buildings account for a large portion of global energy consumption and related CO2 emission [1] , for example, they represent around 39% and 40% of energy consumption and 38% and 36% of CO2 emission in the US [2] and Europe [3] respectively. Within the building section, humidity control is of vital importance for ensuring indoor thermal comfort [4] and product quality [5]. As a matter of fact, 20-40% of energy consumption in heating, ventilation and airconditioning (HVAC) systems is used for air dehumidification [6].…”

Section: Research Backgroundmentioning

confidence: 99%

Steady-state performance evaluation and energy assessment of a complete membrane-based liquid desiccant dehumidification system

et al. 2020

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A complete membrane-based liquid desiccant dehumidification system is investigated under the steady operating condition, which mainly consists of a dehumidifier, a regenerator, three heat exchangers, a cold and a hot water supply units. A finite difference mathematical model is developed for the complete system to investigate the system dehumidification performance and energy requirement, and validated by experimental data. The dehumidification performance is evaluated by the system sensible and latent effectiveness and moisture flux rate, while its energy performance is assessed by the total cooling capacity and coefficient of performance. It is found that the number of heat transfer units in the dehumidifier side and solution to air mass flow rate ratio have the most considerable impact on the system performance, while the number of heat transfer units in the regenerator side and solution inlet concentration in the dehumidifier have comparatively weak influences. The system sensible and latent effectiveness can be improved by increasing the dehumidifier side number of heat transfer units before reaching its critical value of 6. However, the amount of moisture being absorbed, total cooling capacity and coefficient of performance decrease with the dehumidifier side number of heat transfer units at the low air flow rate. The critical value of solution to air mass flow rate ratio varies with number of heat transfer units, and it is preferable to keep the flow rate ratio at or below its critical value as further increasing solution flow rate would reduce the system coefficient of performance.

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Section: Research Backgroundmentioning

confidence: 99%

Steady-state performance evaluation and energy assessment of a complete membrane-based liquid desiccant dehumidification system

et al. 2020

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“…Until now, building energy consumption has accounted for 20–40% of the total energy consumption in China [7] , [8] . And heating and cooling operation as the main sections make up 40% of the building energy consumption [9] , [10] . Therefore, exploring an efficient air conditioning system to build a comfort and healthy indoor environment is significant to the building energy conservation.…”

Section: Introductionmentioning

confidence: 99%

Study on the impact of parallel jet spacing on the performance of multi-jet stratum ventilation

Han

et al. 2022

Applied Energy

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“…A self-energy saving device to improve the performance of a split-type air conditioner which is fabricated using a complex moisture-transferring and quick-drying textile (MTQDT) has been proposed [13]. An evaporation pressure control approach which is based on evaporator pressure and relative humidity reading method which is compared with relative humidity reading (EPCR) and evaporator outlet pressure reading (EPCP) has been introduced [14]. The development of the EPCR system improves indoor thermal comfort and energy efficiency than the EPCP.…”

Section: Introductionmentioning

confidence: 99%

A Microcontroller Based Efficient Scheduling System for Air Conditioner Focusing on Maximum Electricity Savings Using PWM Concept

2021

IJATCSE

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With the development and uses of various electrical and electronic devices, energy consumption in our daily-life is rapidly increasing. Since Air Conditioner (AC) itself is responsible for about half of the energy consumption in home and office environment, several contributions have been proposed to reduce costs. However, almost all of them require internal modification of the AC. As a result, the existing techniques hardly focus the user satisfaction during troublesome situations. To address existing limitations, in this paper, a microcontroller based smart scheduling system using Pulse Width Modulation (PWM) concept has been proposed for efficiently managing the AC operational time. The PWM concept provides complete power switching control rather than traditional sensor control without user intervention. The PWM concept has been applied to dynamically operate the AC using user-defined ‘On_time’, ‘Off_time’, and ‘Cycle_number’. Each Cycle_number is comprised of one On_time and one Off_time period that drives running and mode-switching operation of the AC automatically for the defined Cycle_number, which reduces greater energy consumption during sleep-time. Over traditional sensor control in AC, the proposed PWM based scheduling process controls power switching by automatically managing full-power “cut-off” and “activation” phases which is expedient for power saving and safety. The proposed application enables controlling the AC more dynamically than our traditional thermal sensor control by changing its mode of operation. The tested results reveal that the proposed technique can reduce 50%-75% unnecessary energy consumption by the users in-home or office environment.

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Method to control an air conditioner by directly measuring the relative humidity of indoor air to improve the comfort and energy efficiency

Cited by 34 publications

References 34 publications

Steady-state performance evaluation and energy assessment of a complete membrane-based liquid desiccant dehumidification system

Steady-state performance evaluation and energy assessment of a complete membrane-based liquid desiccant dehumidification system

Study on the impact of parallel jet spacing on the performance of multi-jet stratum ventilation

A Microcontroller Based Efficient Scheduling System for Air Conditioner Focusing on Maximum Electricity Savings Using PWM Concept

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