Heat and mass transfer modeling of an energy efficient Hybrid Membrane-Based Air Conditioning System for humid climates

2021 ◽  
Vol 625 ◽  
pp. 119179
Author(s):  
F. Abdollahi ◽  
S.A. Hashemifard ◽  
A. Khosravi ◽  
T. Matsuura
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Energy Efficient ◽  
Air Conditioning ◽  
Hybrid Membrane ◽  
Air Conditioning System ◽  
Mass Transfer Modeling

Comparison of Modeled and Measured Heat and Mass Transfer in a Liquid Desiccant Air-Conditioning System

2018 ◽  
Author(s):  
Wael Mandow ◽  
Martin Mützel ◽  
Daniel Fleig ◽  
Ulrike Jordan ◽  
Klaus Vajen ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Air Conditioning ◽  
Liquid Desiccant ◽  
Air Conditioning System

Effect of Air Conditioning Position on Thermal Comfort in the Floor Air Conditioning System

2014 ◽  
Vol 493 ◽  
pp. 74-79
Author(s):  
Y.A. Sabtalistia ◽  
S.N.N. Ekasiwi ◽  
B. Iskandriawan
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Energy Consumption ◽  
Thermal Comfort ◽  
Energy Efficient ◽  
Air Conditioning ◽  
Air Conditioning System ◽  
Air Supply ◽  
Air Conditioning Systems ◽  
Air Diffusion

Energy consumption for air conditioning systems (air conditioning system) increased along with the increasing need for fresh air and comfortable in the room especially apartments. FAC system (Floor Air Conditioning) is growing because it is more energy efficient than CAC (Ceiling Air Conditioning) system. However, the position of the AC supply is on the lower level at the FAC system causes draft discomfort becomes greater as air supply closer to the occupants so that thermal comfort can be reduced. Heat mixture of windows, exterior walls, kitchen, and occupants in the studio apartment affect thermal comfort in the room too.This study aims to determine the position of the AC supply which has the best thermal comfort of FAC system in the studio apartment. It can be done by analyzing ADPI (Air Diffusion Performance Index), the distribution of air temperature, wind speed, RH (Relative Humidity), and DR (Draft Risk) to change the position of the AC supply supported by CFD (Computational Fluid Dynamics) simulation.This result prove that AC position 2 (on wall near the kitchen) is more comfortable than AC position 1 (on the bathroom wall) because AC position 2 away from occupied areas, thereby reducing the occurrence of draught discomfort.

Experimental Study on the Enhancement of Mass Transfer Utilizing Fe3O4 Nanofluids

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Lianying Zhang ◽  
Yuanyuan Liu ◽  
Yuan Wang ◽  
Liwen Jin ◽  
Qunli Zhang ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Air Conditioning ◽  
Mass Fraction ◽  
Nanoparticle Size ◽  
Enhancement Ratio ◽  
Fe3o4 Nanoparticle ◽  
Transfer Enhancement ◽  
Air Conditioning System ◽  
Mass Transfer Enhancement ◽  
20 Nm

The absorption air-conditioning system is a low-power-consumption and low-noise system and is also good at balancing the electricity peak-valley system. It can be driven by low-grade energy, such as solar energy and industrial exhaust heat. The nanofluids, which possess the superior thermophysical properties, exhibit a great potential in enhancing heat and mass transfer. In this paper, nanofluids of H2O/LiBr with Fe3O4 nanoparticles were introduced into absorption air conditioning system. The effects of critical parameters, such as the flow rate of H2O/LiBr nanofluids, nanoparticle size and mass fraction, on the falling film absorption were investigated. The H2O/LiBr nanofluids with Fe3O4 nanoparticle mass fractions of 0.01 wt %, 0.05 wt % and 0.1 wt %, and nanoparticle sizes of 20 nm, 50 nm and 100 nm were tested. The results imply that the vapor absorption rate could be improved by adding the nanoparticles to H2O/LiBr solution. The smaller the nanoparticle size, the greater the enhancement of the heat and mass transfer. The absorption enhancement ratio increases sharply at first by increasing the nanoparticle mass fraction within a range of relatively low mass fraction and then exhibits a slow growing even reducing trends with increasing the mass fraction further. For Fe3O4 nanoparticle mass fraction of 0.05 wt % and nanoparticle size of 20 nm, the maximum mass transfer enhancement ratio is achieved about 2.28 at the flow rate of 100 L h−1. Meanwhile, a fitting formula of mass transfer enhancement ratio for Fe3O4 nanofluids has been improved.

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