Empirical analysis of indoor air quality enhancement potential in a liquid-desiccant assisted air conditioning system

Park, Joon‐Young; Yoon, Dong-Seob; Li, Shiying; Park, J.S.; Bang, Jong-Il; Sung, Minki; Jeong, Jae-Weon

doi:10.1016/j.buildenv.2017.05.011

Cited by 35 publications

(15 citation statements)

References 11 publications

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“…Simulations were conducted based on the data verified in the previous experimental study. It was indicated in the open literature [8] that the packed tower-type LD dehumidifier could remove 48% of 2.5-5.0 µm particles, and 85% of 10-25 µm particles by using the particle counter, which can measure the number of small airborne particles with the residual error of 0.1%. Consequently, in this work, the PM 2.5 and PM 10 removal rates for the packed-tower-type LD dehumidifier that was used in the DEVap system and LD-IDECOAS were set as 48% and 85%, respectively.…”

Section: Particle Removal Ratesmentioning

confidence: 99%

“…This system is a once-through system that serves the zone by supplying conditioned outdoor air, and the zone return air is exhausted to the outside via the indirect evaporative cooler. No cross-contamination occurs, because the zone return air is not redirected to and mixed with the supply air stream [6,8]. The energy benefit of the LD-IDECOAS compared with the conventional VAV system was also indicated in the open literature [9][10][11].…”

Section: Introductionmentioning

confidence: 97%

“…The air contaminant removal efficiencies of the LD dehumidifier and direct evaporative cooler (DEC) were evaluated empirically in some studies. Park et al [8] indicated that the packed tower-type LD dehumidifier could remove 48% of the 2.5-5.0 µm and 85% of 10-25 µm particulate contaminants in the process air stream. Paschold et al [12] demonstrated empirically that the DEC with a rigid media pad could remove 11% of 2.5-µm particles (PM 2.5 ), and 49% of 10-µm particles (PM 10 ) in the process air.…”

Section: Introductionmentioning

confidence: 99%

“…The concentrations of PM 10 and PM 2.5 were the mass concentration, and were applied directly to the mass balance equation, while the volumetric concentration of CO 2 was converted to the mass concentration for the simulation using Equations (8) Since the atmospheric CO 2 concentration exceeded 400 ppm recently [19], it was assumed that the background (or outdoor air) CO 2 concentration was 400 ppm in this research. As for the PM 10 and PM 2.5 concentrations in the outdoor air, the official hourly measurement data [20] provided by the local government was applied in this simulation (Figure 7).…”

mentioning

confidence: 99%

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Indoor Air Quality Enhancement Performance of Liquid Desiccant and Evaporative Cooling-Assisted Air Conditioning Systems

2019

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The main objective of this study is to investigate the indoor air quality enhancement performance of two different liquid desiccant and evaporative cooling-assisted air conditioning systems, such as the variable air volume (VAV) system with the desiccant-enhanced evaporative (DEVap) cooler, and the liquid desiccant system with an indirect and direct evaporative cooling-assisted 100% outdoor air system (LD-IDECOAS), compared with the conventional VAV system. The transient simulations of concentration variations of carbon dioxide (CO2), coarse particles, and fine particles (PM10 and PM2.5) in a model office space served by each system were performed using validated system models that were found in the literature. Based on the hourly thermal loads of the model space predicted by the TRNSYS 18 program, each air conditioning system was operated virtually using a commercial equation solver program (EES). The results indicated that the LD-IDECOAS provided the lowest annual indoor CO2 concentration among all the systems considered in this research, while the VAV system with DEVap cooler exceeded the threshold concentration (i.e., 1000 ppm) during the cooling season (i.e., July, August, and September). For the indoor particulate contaminant concentrations, both liquid desiccant and evaporative cooling-assisted air conditioning systems indicated lower indoor PM2.5 and PM10 concentrations compared with the reference system. The LD-IDECOAS and the VAV with a DEVap cooler demonstrated 33.3% and 23.5% lower annual accumulated indoor PM10 concentrations than the reference system, respectively. Similarly, the annual accumulated indoor PM2.5 concentration was reduced by 16% using the LD-IDECOAS and 17.1% using the VAV with DEVap cooler.

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Section: Particle Removal Ratesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Indoor Air Quality Enhancement Performance of Liquid Desiccant and Evaporative Cooling-Assisted Air Conditioning Systems

2019

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“…Due the appealing properties of desiccants with their affinity for more than water vapor, such as microorganisms, they are widely used in the applications in which air borne microorganisms could cause major issues, for example hospitals and medical facilities [31][32][33].…”

Section: Figurementioning

confidence: 99%

Adaption of an Evaporative Desert Cooler into a Liquid Desiccant Air Conditioner: Experimental and Numerical Analysis

2019

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Desert coolers have attracted much attention as an alternative to mechanical air conditioning systems, as they are proving to be of lower initial cost and significantly lower operating cost. However, the uncontrolled increase in the moisture content of the supply air is still a great issue for indoor air quality and human thermal comfort concerns. This paper represents an experimental and numerical investigation of a modified desert air cooler into a liquid desiccant air conditioner (LDAC). An experimental setup was established to explore the supply air properties for an adapted commercial desert cooler. Several experiments were performed for air-water and air-desiccant as flow media, at several solutions to air mass ratios. Furthermore, the experimental results were compared with the result of a numerical simplified effectiveness model. The outcomes indicate a sharp reduction in the air humidity ratio by applying the desiccant solutions up to 5.57 g/kg and up to 4.15 g/kg, corresponding to dew point temperatures of 9.5 • C and 12.4 • C for LiCl and CaCl 2 , respectively. Additionally, the experimental and the numerical results concurred having shown the same pattern, with a maximal deviation of about 18% within the experimental uncertainties.

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A Simplistic Method for Measurement of Bioaerosol in Indoor Air

Saha,

Mazumder

2024

Springer Proceedings in Earth and Environmental Sciences

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Empirical analysis of indoor air quality enhancement potential in a liquid-desiccant assisted air conditioning system

Cited by 35 publications

References 11 publications

Indoor Air Quality Enhancement Performance of Liquid Desiccant and Evaporative Cooling-Assisted Air Conditioning Systems

Indoor Air Quality Enhancement Performance of Liquid Desiccant and Evaporative Cooling-Assisted Air Conditioning Systems

Adaption of an Evaporative Desert Cooler into a Liquid Desiccant Air Conditioner: Experimental and Numerical Analysis

A Simplistic Method for Measurement of Bioaerosol in Indoor Air

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