Performance Improvement of Membrane Energy Exchanger using Ultrasound for HVAC Application

2021 ◽  
pp. 1-29
Author(s):  
Gurubalan Annadurai ◽  
Maiya M.P. ◽  
Patrick Geoghegan ◽  
Carey Simonson
Keyword(s):  
Air Conditioning ◽  
Energy Recovery ◽  
Mass Transfer Process ◽  
Porous Membrane ◽  
Air Conditioning System ◽  
Energy Saving Potential ◽  
Recovery Processes ◽  
Additional Resistance ◽  
Membrane Energy ◽  
Ac Systems

Abstract Air conditioning (AC) systems consume the maximum proportion of the total electricity used in the building sector. The demand of AC systems is expected to increase exponentially in the coming years due to various reasons such as climate change, increasing affordability and increase in living floor space. Membrane-based liquid desiccant AC system along with energy recovery ventilating equipment is considered as a prospective alternative to the conventional air conditioning system (CACS) and has the potential to meet the increasing current and future AC demand in a sustainable manner. Its efficiency and energy saving potential with respect to CACS depends on the performance of the membrane-based dehumidifier, regenerator and energy recovery ventilating equipment which are commonly referred to as membrane energy exchangers (MEEs). MEE is an indirect exchanger type in which the working streams are separated by a porous membrane. This intermediate membrane creates an additional resistance for the heat and mass transfer process in the MEE. To reduce the resistance, this study experimentally and numerically investigates the influence of ultrasound on the performance of the MEE for dehumidification, humidification (applicable for membrane-based evaporative cooling and desiccant regeneration devices) and energy recovery processes. It is found that the vibration due to ultrasound has the potential to improve the effectiveness of the MEE by 55% in the dehumidification process and by 65% in the humidification and energy recovery processes.

Air Conditioning System Water Quality and Equipment Condition Investigation and Analysis of Energy Saving Measures

2012 ◽  
Vol 516-517 ◽  
pp. 1224-1228
Author(s):  
Na Liang ◽  
Rui Li
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Water System ◽  
Building Energy ◽  
Development Trend ◽  
Air Conditioning System ◽  
Effective Utilization ◽  
Energy Saving Potential ◽  
Central Air Conditioning ◽  
Points Of View

Due to energy reserves reduces gradually and uneven distribution, all countries pay more and more attention to energy saving and improve the effective utilization of energy, China also attaches great important to this. Energy saving of buildings is a necessary development trend. Air conditioning system as a large important part of building energy consumption has a huge energy-saving potential. This article mainly introduced the related strategies of energy saving in central air conditioning water system from the following three points of view: the water treatment, the cooling tower, and the variable frequency pump.

scholarly journals Performance optimization of polymeric porous membrane-based liquid desiccant air dehumidifier used in air conditioning system

2019 ◽  
Vol 11 (1) ◽  
pp. 55-71
Author(s):  
Ali Mohammad Jafarpour ◽  
Farivar Fazelpour ◽  
Seyyed Abbas Mousavi
Keyword(s):  
Performance Optimization ◽  
Air Conditioning ◽  
Weather Conditions ◽  
Porous Membrane ◽  
Operating Conditions ◽  
Regeneration System ◽  
Liquid Desiccant ◽  
Air Conditioning System ◽  
Air Stream ◽  
Improved Performance

AbstractIn this study an experimental design was developed to optimize the performance and structure of a membrane-based parallel-plate liquid desiccant dehumidifier used in air conditioning regeneration system which operates under high humidity weather conditions. We conducted a series of polymeric porous membranes with different compositions fabricated that were prepared with various weight percentages of polysulfone (PSU), mixed with N-methyl-2-pyrrolidone (NMP) and dimethyl form amide (DMF) solvents. Furthermore, the designed experiments were performed under various operating conditions, indicating that the dehumidification efficiency declines with increasing flow rate, temperature, and humidity. Consequently, a membrane with optimized porosity and moisture permeability was selected which resulted in eliminating the carryover of solution droplets in the air, largely due to separating the flow condition of liquid desiccant (Li Cl) and air. This specific design is also greatly benefited by removing the water vapor from the air stream. The results of mathematical model simulations indicate that the DMF solvent had higher dehumidification capability compared with that of NMP under the optimized operating conditions. Additionally, it can clarify the porosity of the membrane which plays a significant role in the overall performance. Therefore, the fabricated membrane produces fresh cool air, and it can be applied as a guiding sample for designing the membrane-based dehumidifier with improved performance.

Research on Raising Load Potentials Using MPCM Slurry Storage

2014 ◽  
Vol 568-570 ◽  
pp. 1770-1773
Author(s):  
Guang Wei Zhao
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Design Method ◽  
Evaporative Cooling ◽  
Simulation Code ◽  
Air Conditioning System ◽  
Energy Saving Potential ◽  
Microencapsulated Phase Change Material ◽  
Slurry Storage ◽  
Change Material

Evaporative cooling is able to generate the cooling medium at a temperature approaching to the ambient wet bulb temperature. In this paper, a low-energy air-conditioning strategy is proposed, which is a combination of cooled ceiling (CC),microencapsulated phase change material (MPCM) slurry storage and evaporative cooling technologies. The assessment of evaporative cooling availability and utilization is done for five representative climatic cities, including Hong Kong, Shanghai, Beijing, Lanzhou and Urumqi in China, and the energy saving potential of the proposed air-conditioning system is analyzed by using a well validated building simulation code. The results indicate that the new system offers energy saving potential up to 80% under northwestern Chinese climate and up to 10% under southeastern Chinese climate. The optimal design method of the slurry storage tank is also proposed based on the slurry cooling storage behaviors and cooling demand variations of the ceiling panels.

Analysis for Energy Savings Potential and Economics of Combined Air-Conditioning System with Temperature and Humidity Decoupled Treatment

2011 ◽  
Vol 280 ◽  
pp. 71-75
Author(s):  
Zhong Chao Zhao ◽  
Dong Hui Zhang ◽  
Yu Ping Chen
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Air Conditioning ◽  
Energy Savings ◽  
Operating Cost ◽  
Air Conditioning System ◽  
Operation Mechanism ◽  
Energy Saving Potential ◽  
Temperature And Humidity

In this paper, the operation mechanism of combined air-conditioning system with temperature and humidity decoupled treatment (CACSTHDT) was presented, and the energy saving potential and economics of CACSTHDT were primarily analyzed through compared with a traditional air-conditioning system. The results indicated that CACSTHDT could save up to 28.64% energy consumption in comparison with a traditional air-conditioning system. The operating cost in one summer only was 71.36% of that cost of traditional air-conditioning system.

scholarly journals Research on elecctro-sorption method for air conditioning system with binary solution

2021 ◽  
Vol 271 ◽  
pp. 01012
Author(s):  
Chenchen Li ◽  
Xiuwei Li ◽  
Yonghang Li
Keyword(s):  
Cost Effectiveness ◽  
Air Conditioning ◽  
Energy Recovery ◽  
Binary Solution ◽  
Working Fluid ◽  
Mixed Solution ◽  
Air Conditioning System ◽  
Sorption Method ◽  
The Cost ◽  
Better Than

Absorption air-conditioning system is a green air-conditioning system. With binary solution as the working fluid, the system performance is better with lower cost. To further improve the efficiency, an electrosorption method is proposed to regenerate the absorbent solution. Its principle is similar to capacitive deionization. The system with LiBr-CaCl2 has been confirmed in the improvement of performance, while the cost-effectiveness wasn’t ideal to satisfy the need of some cases. To solve this problem, the system with MgCl2-CaCl2 is proposed to analyze the enhancement in the cost-effectiveness. The theoretical and experimental results verify the advantage in the cost-effectiveness compared to the system with LiBr-CaCl2. Although the performance of the system with MgCl2-CaCl2 is lower than the other mixed solution, the actual COP could reach 1.9, which is still better than the system with single absorbents. Meanwhile, the energy recovery characteristic could further enhance the advantage in the improvement of performance for the system with LiBr-CaCl2 and make up the weakness of the system with MgCl2-CaCl2 solution. The exploration of higher energy recovery efficiency will further improve the competitiveness of the system.

The Project Design for Cold Energy Recovery of LNG Vehicle Air-Conditioning System

2013 ◽  
Vol 773 ◽  
pp. 43-46 ◽  
Author(s):  
Fa Yi Yan ◽  
Bo Yan Xu
Keyword(s):  
Natural Gas ◽  
Air Conditioning ◽  
Energy Recovery ◽  
Liquefied Natural Gas ◽  
Project Design ◽  
Air Conditioning System ◽  
City Bus ◽  
Cold Energy ◽  
Design Requirements

A kind of potential fuel for vehicles is Liquefied Natural Gas (LNG) whose cryogenic energy can be recovered for vehicles air-conditioning system. In this paper, LNG city bus air-conditioning system utilizing LNG cold energy is concerned to be subject investigated. The design requirements of cold energy recovering for LNG city bus air-conditioning system are introduced and the project design is presented.

scholarly journals Energy Saving Potential of Air Conditioning System of Equipment Stations in Metro Systems

2017 ◽  
Vol 205 ◽  
pp. 3519-3524 ◽  
Author(s):  
Hang Li ◽  
Bo Tang ◽  
Lunfei Che ◽  
Jun Liu ◽  
Xing Su
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Air Conditioning System ◽  
Energy Saving Potential ◽  
Metro Systems
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