Energy performance of liquid desiccant and evaporative cooling-assisted 100% outdoor air systems under various climatic conditions

Shiying Li, Jae Weon Jeong

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The main purpose of this study is to evaluate the applicability of a liquid desiccant and evaporative cooling-assisted 100% outdoor air system (LD-IDECOAS) in six typical cities in China. The six cities are located in different climatic zones in China and are selected because they are comparable owing to the outdoor air conditions. Many studies have shown that the annual operating energy consumption of LD-IDECOAS is nearly half compared with the conventional variable air volume (VAV) system. Because the climate characteristics of the six selected cities were different, the appropriate mode of operation of the LD-IDECAOS was applied to each studied city, and energy simulations were performed. Based on the design conditions of each region, the required cooling and heating loads were calculated for office buildings using transient system simulations (TRNSYS) 17, and the performance of the LD-IDECOAS and its energy consumption were simulated with a commercial engineering equation solver (EES) program. Depending on the climate characteristics of each city, adequate modifications were evaluated with simulations in terms of energy consumption. The proposed system was compared with the VAV system and the evaporative cooling assisted 100% outdoor air-conditioning system (IDECOAS) for detailed simulation results in the effort to evaluate the energy-saving potential. Finally, the results show that the proposed system saves considerable energy over conventional VAV systems and, in summer, the applications save even more energy than IDECOAS. However, there is a slight difference between the different geographical regions in terms of the annual operating energy consumption. In summary, the proposed system can yield significant energy-saving benefits in hot and humid regions whereas, in dry regions, the proposed system is more applicable in the summer. Consequently, LD-IDECOAS can be adopted for different climatic zones as a heating, ventilating, and air-conditioning (HVAC) system by introducing 100% outdoor air.

Original languageEnglish
Article number1377
JournalEnergies
Volume11
Issue number6
DOIs
StatePublished - 2018 Jun 1

Fingerprint

Cooling
Liquid
Liquids
Energy utilization
Air
Energy
Energy Consumption
Air conditioning
Energy conservation
Geographical regions
Heating
Energy Saving
Office buildings
Conditioning
Climate
Annual
China
Loads (forces)
Simulation
Modes of Operation

Keywords

  • 100% outdoor air system
  • Energy simulation
  • Evaporative cooling system
  • Liquid desiccant system
  • Non-vapor compression air-conditioning system

Cite this

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title = "Energy performance of liquid desiccant and evaporative cooling-assisted 100{\%} outdoor air systems under various climatic conditions",
abstract = "The main purpose of this study is to evaluate the applicability of a liquid desiccant and evaporative cooling-assisted 100{\%} outdoor air system (LD-IDECOAS) in six typical cities in China. The six cities are located in different climatic zones in China and are selected because they are comparable owing to the outdoor air conditions. Many studies have shown that the annual operating energy consumption of LD-IDECOAS is nearly half compared with the conventional variable air volume (VAV) system. Because the climate characteristics of the six selected cities were different, the appropriate mode of operation of the LD-IDECAOS was applied to each studied city, and energy simulations were performed. Based on the design conditions of each region, the required cooling and heating loads were calculated for office buildings using transient system simulations (TRNSYS) 17, and the performance of the LD-IDECOAS and its energy consumption were simulated with a commercial engineering equation solver (EES) program. Depending on the climate characteristics of each city, adequate modifications were evaluated with simulations in terms of energy consumption. The proposed system was compared with the VAV system and the evaporative cooling assisted 100{\%} outdoor air-conditioning system (IDECOAS) for detailed simulation results in the effort to evaluate the energy-saving potential. Finally, the results show that the proposed system saves considerable energy over conventional VAV systems and, in summer, the applications save even more energy than IDECOAS. However, there is a slight difference between the different geographical regions in terms of the annual operating energy consumption. In summary, the proposed system can yield significant energy-saving benefits in hot and humid regions whereas, in dry regions, the proposed system is more applicable in the summer. Consequently, LD-IDECOAS can be adopted for different climatic zones as a heating, ventilating, and air-conditioning (HVAC) system by introducing 100{\%} outdoor air.",
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Energy performance of liquid desiccant and evaporative cooling-assisted 100% outdoor air systems under various climatic conditions. / Li, Shiying; Jeong, Jae Weon.

In: Energies, Vol. 11, No. 6, 1377, 01.06.2018.

Research output: Contribution to journalArticle

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