Energy saving potential of a hybrid HVAC system with a desiccant wheel activated at low temperatures and an indirect evaporative cooler in handling air in buildings with high latent loads

Comino, Francisco; Peci, F.

doi:10.1016/j.applthermaleng.2017.12.004

Cited by 47 publications

(12 citation statements)

References 28 publications

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“…It was found out that for the same supply airflow and regenerative airflow parameters, the first system was approximately 60-65% more efficient than the second one. Comino et al [53] determined an annual energy consumption of a hybrid system (composed of desiccant wheel and indirect evaporative cooler), in comparison to direct expansion conventional system. The hybrid system shows a significant energy saving, up to 46.8%, which was shown in simulations results.…”

Section: Desiccant Systemsmentioning

confidence: 99%

“…The COP of this system varies between 0.65 and 1.17. Comino et al [53] focused on determining mainly the annual electricity consumption and seasonal coefficient of performance of a hybrid air conditioning system with a desiccant wheel and indirect evaporative cooler for 6 climate zones. The simulation results show that the system analyzed shows significant energy savings up to 46.8%, compared to a typical direct expansion system.…”

Section: Desiccant Systemsmentioning

confidence: 99%

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Review of Dew Point Evaporative Cooling Technology for Air Conditioning Applications

Pacak

Worek

2021

Applied Sciences

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Indirect evaporative cooling has the potential to significantly improve the natural environment. It follows from a significant reduction in electricity consumption in the hot period, and hence lower operating costs for cooling systems. This paper presents the current state of knowledge and research directions on dew point indirect evaporative cooling. It was found that researchers focus on the development of dew point indirect evaporative coolers (DPIEC) by improving its design, geometry, water distribution, and new porous materials implementation. To evaluate the performance of new types of DPIEC, different methods are used by the scientists. Finally, optimized devices are studied in terms of their performance in different systems, like hybrid and desiccant systems, considering different climate conditions. Potential directions of development of evaporative technologies were indicated, such as increasing the coefficient of performance of solid desiccant evaporative cooling systems, developing novel geometry, and efficient water distribution, including development of porous materials.

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Section: Desiccant Systemsmentioning

confidence: 99%

Section: Desiccant Systemsmentioning

confidence: 99%

Review of Dew Point Evaporative Cooling Technology for Air Conditioning Applications

Pacak

Worek

2021

Applied Sciences

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“…For such reasons, IEC has been further improved based on a M-cycle conception [16], which also called a dew-point evaporative cooler and regenerative evaporative cooler (REC) [17,18]. In order to control indoor humidity level, IEC can be also integrated with a heat-driven dehumidification system such as a liquid desiccant dehumidifier and a solid desiccant dehumidifier [19][20][21]. Alternatively, it can be combined with a direct evaporative cooler [22].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Approaches to energy efficiency in air conditioning: A comparative study on purge configurations for indirect evaporative cooling

Shahzad

Burhan

et al. 2019

Energy

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This paper presents a mathematical model to enable a more in-depth understanding of the combined heat and mass transfer processes of a counter-flow indirect evaporative cooler operating in semi-arid regions. A series of simulation was conducted to compare the performances between a single-purge and four-purge configurations. Furthermore, the effect of several parameters on the performance of the single-purge configuration was investigated under the baseline condition. The developed model was validated against experimental data from literatures to within 2% discrepancy. Key results revealed that the single-purge configuration produced higher cooling capacity (around 20% higher), as well as higher dewpoint effectiveness under the same operating conditions. A parametric study was also made on the single-purge configuration. The results revealed that lower product air temperature and higher dew-point effectiveness were achieved with longer channel length and larger purge ratio. However, the maximum cooling capacity approached its maximum with longer channel length and 35% purge ratio.

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“…The energy consumption of different hybrid HVAC systems was analyzed in other research studies [27][28][29][30][31]. A numerical study showed a COP value of 2.1 using a solar desiccant cooling system when operating in cooling mode [28].…”

Section: Introductionmentioning

confidence: 99%

Seasonal Analysis Comparison of Three Air-Cooling Systems in Terms of Thermal Comfort, Air Quality and Energy Consumption for School Buildings in Mediterranean Climates

2021

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Efficient air-cooling systems for hot climatic conditions, such as Southern Europe, are required in the context of nearly Zero Energy Buildings, nZEB. Innovative air-cooling systems such as regenerative indirect evaporative coolers, RIEC and desiccant regenerative indirect evaporative coolers, DRIEC, can be considered an interesting alternative to direct expansion air-cooling systems, DX. The main aim of the present work was to evaluate the seasonal performance of three air-cooling systems in terms of air quality, thermal comfort and energy consumption in a standard classroom. Several annual energy simulations were carried out to evaluate these indexes for four different climate zones in the Mediterranean area. The simulations were carried out with empirically validated models. The results showed that DRIEC and DX improved by 29.8% and 14.6% over RIEC regarding thermal comfort, for the warmest climatic conditions, Lampedusa and Seville. However, DX showed an energy consumption three and four times higher than DRIEC for these climatic conditions, respectively. RIEC provided the highest percentage of hours with favorable indoor air quality for all climate zones, between 46.3% and 67.5%. Therefore, the air-cooling systems DRIEC and RIEC have a significant potential to reduce energy consumption, achieving the user’s thermal comfort and improving indoor air quality.

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Energy saving potential of a hybrid HVAC system with a desiccant wheel activated at low temperatures and an indirect evaporative cooler in handling air in buildings with high latent loads

Cited by 47 publications

References 28 publications

Review of Dew Point Evaporative Cooling Technology for Air Conditioning Applications

Review of Dew Point Evaporative Cooling Technology for Air Conditioning Applications

Approaches to energy efficiency in air conditioning: A comparative study on purge configurations for indirect evaporative cooling

Seasonal Analysis Comparison of Three Air-Cooling Systems in Terms of Thermal Comfort, Air Quality and Energy Consumption for School Buildings in Mediterranean Climates

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