Energy performance of air cooling systems considering indoor temperature and relative humidity in different climate zones in China

2013 ◽  
Vol 64 ◽  
pp. 145-153 ◽  
Author(s):  
Fenghua Ge ◽  
Xinglong Guo ◽  
Hongkai Liu ◽  
Jian Wang ◽  
Cuiyin Lu
Keyword(s):  
Relative Humidity ◽  
Energy Performance ◽  
Air Cooling ◽  
Indoor Temperature ◽  
Cooling Systems ◽  
Climate Zones

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

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4436
Author(s):  
María Jesús Romero-Lara ◽  
Francisco Comino ◽  
Manuel Ruiz de Adana
Keyword(s):  
Energy Consumption ◽  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Mediterranean Area ◽  
Climatic Conditions ◽  
Air Cooling ◽  
Cooling Systems ◽  
Climate Zones

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.

Thermal Performance Evaluation of Friction Stir Welded Flat Plate Heat Sink Using CFD Analysis

2015 ◽  
Vol 787 ◽  
pp. 505-509
Author(s):  
A.K. Lakshminarayanan ◽  
M. Suresh
Keyword(s):  
Flat Plate ◽  
Heat Sink ◽  
High Efficiency ◽  
Base Plate ◽  
Software Tool ◽  
Cover Plate ◽  
Air Cooling ◽  
Cooling Systems ◽  
Plate Heat ◽  
Friction Stir

In an era of compact cooling requirements, where air cooling systems seem to be ineffective and consistently, being replaced by liquid cooled systems, with greater watt density heat energy dissipation. Such cooling systems must work with good quality enabling high efficiency. Hence, an attempt is made to fabricate an aluminum alloy based flat plate heat sink with cover and base plate using friction stir welding. The base plate is machined to obtain channels for fluid flow and the cover plate is fitted in the base plate and welded. Two such configurations of these heat sinks were fabricated with varying channel lengths and number of channels. The flow characteristics of the model for these configurations were analyzed numerically using computational fluid dynamics (CFD) software tool, ANSYS fluent 14.

Inlet Air Cooling Applied to Combined Cycle Power Plants: Influence of Site Climate and Thermal Storage Systems

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
Nicola Palestra ◽  
Giovanna Barigozzi ◽  
Antonio Perdichizzi
Keyword(s):  
Power Output ◽  
Parametric Analysis ◽  
Power Plants ◽  
Cooling System ◽  
Thermal Storage ◽  
Combined Cycle ◽  
Operating Conditions ◽  
Air Cooling ◽  
Ambient Conditions ◽  
Cooling Systems

The paper presents the results of an investigation on inlet air cooling systems based on cool thermal storage, applied to combined cycle power plants. Such systems provide a significant increase of electric energy production in the peak hours; the charge of the cool thermal storage is performed instead during the night time. The inlet air cooling system also allows the plant to reduce power output dependence on ambient conditions. A 127MW combined cycle power plant operating in the Italian scenario is the object of this investigation. Two different technologies for cool thermal storage have been considered: ice harvester and stratified chilled water. To evaluate the performance of the combined cycle under different operating conditions, inlet cooling systems have been simulated with an in-house developed computational code. An economical analysis has been then performed. Different plant location sites have been considered, with the purpose to weigh up the influence of climatic conditions. Finally, a parametric analysis has been carried out in order to investigate how a variation of the thermal storage size affects the combined cycle performances and the investment profitability. It was found that both cool thermal storage technologies considered perform similarly in terms of gross extra production of energy. Despite this, the ice harvester shows higher parasitic load due to chillers consumptions. Warmer climates of the plant site resulted in a greater increase in the amount of operational hours than power output augmentation; investment profitability is different as well. Results of parametric analysis showed how important the size of inlet cooling storage may be for economical results.

scholarly journals Study on Outside Air Cooling Systems Used in Data Processing Facilities

2012 ◽  
Vol 11 (1) ◽  
pp. 219-223 ◽  
Author(s):  
Iwao Yamaguchi ◽  
Makoto Koganei ◽  
Tomonobu Goto ◽  
Masataka Tsushima
Keyword(s):  
Data Processing ◽  
Air Cooling ◽  
Cooling Systems

Numerical simulations of flow induced noise from a dual rotor cooling fan used in electronic cooling systems

2021 ◽  
Vol 263 (5) ◽  
pp. 1308-1319
Author(s):  
Sahan Wasala ◽  
Yutong Xue ◽  
Lon Stevens ◽  
Ted Wiegandt ◽  
Tim Persoons
Keyword(s):  
Noise Exposure ◽  
Acoustic Noise ◽  
High Capacity ◽  
Disk Drive ◽  
Air Cooling ◽  
Noise Sources ◽  
Cooling Systems ◽  
Cooling Fan ◽  
Flow Induced Noise ◽  
High Level

Hard Disk Drive (HDD) system enclosures in a data center require effective cooling systems to avoid HDD overheating. These systems often rely on air cooling because of their cost effciency and maintainability. Air cooling systems typically consist of an array of axial fans which push or pull the air through the system. These fans emit high level tonal noise particularly at high tip speed ratios. High-capacity HDDs, on the other hand, are sensitive to high acoustic noise, which consequently increases the risk of read/write error and deteriorates drive performance. Therefore, cooling fan noise adversely affects the function of the HDD enclosure systems which emphasizes the need to understand the noise sources and develop methods to mitigate HDD noise exposure.

scholarly journals Absorption cooling systems – Review of various techniques for energy performance enhancement

2020 ◽  
Vol 59 (2) ◽  
pp. 707-738 ◽  
Author(s):  
Rasoul Nikbakhti ◽  
Xiaolin Wang ◽  
Ahmed Kadhim Hussein ◽  
Aghil Iranmanesh
Keyword(s):  
Performance Enhancement ◽  
Energy Performance ◽  
Cooling Systems ◽  
Absorption Cooling
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