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- Air conditioning (3)
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- Air-conditioning system (1)
- Anodized aluminum (1)
- Comparative study (1)
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- Degree of superheat (1)
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- Direct expansion air conditioning (1)
- Direct-expansion (1)
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- Falling film regeneration; internal heating; corrosion; surface energy; anodized aluminum plate (1)
- Fuzzy logic control (1)
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- Liquid desiccant dehumidifier (1)
- Liquid desiccant. Evaporative cooling. Exergy analysis. Economic analysis (1)
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Articles 1 - 10 of 10
Full-Text Articles in Engineering
Comparative Study Of On-Off Control And Novel High- Low Control Of Regenerative Indirect Evaporative Cooler (Riec)., Yi Chen, Huaxia Yan, Hongxing Yang
Comparative Study Of On-Off Control And Novel High- Low Control Of Regenerative Indirect Evaporative Cooler (Riec)., Yi Chen, Huaxia Yan, Hongxing Yang
Faculty of Science & Technology (THEi)
The main characteristic of an indirect evaporative cooler (IEC) is its dependency on ambient air conditions. To ensure stable indoor temperature and provide better thermal comfort for the occupants, proper control strategy is essential. However, very limited studies report the controller used in IEC. Therefore, two control schemes are comparatively studied for regenerative indirect evaporative cooler (RIEC) application, including conventional on-off control and newly proposed high-low (H-L) control. Under on-off control scheme, the fans are either in operation at constant rated speeds or turned off if the indoor temperature is satisfied. While under H-L control scheme, the fans would be …
A New Capacity Controller For A Direct Expansion Air Conditioning System For Operational Safety And Efficiency., Yudong Xia, Huaxia Yan, Shiming Deng, Ming-Yin Chan
A New Capacity Controller For A Direct Expansion Air Conditioning System For Operational Safety And Efficiency., Yudong Xia, Huaxia Yan, Shiming Deng, Ming-Yin Chan
Faculty of Science & Technology (THEi)
For achieving a balance between the operational safety and efficiency of a variable speed direct expansion air conditioning system, a new capacity controller that can not only simultaneously control indoor air temperature and humidity, but also select an optimized degree of superheat setting to properly balance the operational safety and efficiency has been developed, by adding a control module to a previously developed capacity controller. The core of the control module was an artificial neural network based model representing the known relationship between the inherent operational characteristics and operational stability of a variable speed direct expansion air conditioning system. Using …
Development And Experimental Study Of A Novel Plate Dehumidifier Made Of Anodized Aluminum., Tao Wen, Lin Lu, Chuanshuai Dong, Yimo Luo
Development And Experimental Study Of A Novel Plate Dehumidifier Made Of Anodized Aluminum., Tao Wen, Lin Lu, Chuanshuai Dong, Yimo Luo
Faculty of Science & Technology (THEi)
The falling film dehumidifier is a key component in the liquid desiccant cooling system (LDCS). However, the most commonly used metals, such as steel and aluminum, can hardly resist the erosion of liquid desiccant. It greatly limits the fabrication of compact dehumidifiers and hinders the promotion of LDCS. The present study introduced a novel falling film dehumidifier which was made by the metal of anodized aluminum. Experiments were carried out to compare the dehumidification performance between ordinary aluminum dehumidifier and anodized one. The influences of air temperature, mass flow rate, inlet humidity and solution temperature, mass flow rate, temperature on …
Energy-Efficient And -Economic Technologies For Vapor Compression Refrigeration Systems: A Comprehensive Review., Xiaohui She, Lin Cong, Binjian Nie, Guanghui Leng, Hao Peng, Yi Chen, Xiaosong Zhang, Tao Wen, Hongxing Yang, Yimo Luo
Energy-Efficient And -Economic Technologies For Vapor Compression Refrigeration Systems: A Comprehensive Review., Xiaohui She, Lin Cong, Binjian Nie, Guanghui Leng, Hao Peng, Yi Chen, Xiaosong Zhang, Tao Wen, Hongxing Yang, Yimo Luo
Faculty of Science & Technology (THEi)
Vapor Compression Refrigeration Systems (VCRS) are widely used to provide cooling or freezing for domestic/office buildings, supermarkets, data centres, etc., which expend 15% of globally electricity and contribute to ∼10% of greenhouse gas emissions globally. It is reported that cooling demand is expected to grow tenfold by 2050. Therefore, it is critical to improve the efficiency of the VCRS. In this paper, a comprehensive review of advanced and hot technologies is conducted for the VCRS. These technologies include radiative cooling, cold energy storage, defrosting and frost-free, temperature and humidity independent control (THIC), ground source heat pump (GSHP), refrigerant subcooling, and …
Investigation On Solar Assisted Liquid Desiccant Dehumidifier And Evaporative Cooling System For Fresh Air Treatment., Yi Chen, Hongxing Yang, Yimo Luo
Investigation On Solar Assisted Liquid Desiccant Dehumidifier And Evaporative Cooling System For Fresh Air Treatment., Yi Chen, Hongxing Yang, Yimo Luo
Faculty of Science & Technology (THEi)
The widely used semi-centralized air conditioning (A/C) system consisting of independent fresh air system and fan coil system suffers from huge energy consumption, especially for fresh air treatment. Therefore, a liquid desiccant dehumidifier and regenerative indirect evaporative cooling (LDD-RIEC) system is proposed for fresh air treatment. The fresh air is handled by the LDD-RIEC system in which no electricity-intensive compressor involves. The hot and humid fresh air is firstly dehumidified by LDD and then sensibly cooled by RIEC. The thermal energy captured by solar collectors is used for desiccant solution regeneration. Indoor return air is cooled by fan coils of …
Further Development Of A Thermal Comfort Based Fuzzy Logic Controller For A Direct Expansion Air Conditioning System, Huaxia Yan, Yan Pan, Zhao Li, Shiming Deng
Further Development Of A Thermal Comfort Based Fuzzy Logic Controller For A Direct Expansion Air Conditioning System, Huaxia Yan, Yan Pan, Zhao Li, Shiming Deng
Faculty of Science & Technology (THEi)
The primary purpose of A/C is offering occupants with acceptable indoor thermal comfort levels. Thermal comfort is a complicated result of non-linear interactions between six parameters. However, many of current A/C systems solely control air temperature. Whenever anyone of the five parameters other than temperature varies significantly, an occupant may feel thermally uncomfortable. To address the issue, a comprehensive thermal comfort index should be used as regulator in A/C systems. One fuzzy logic controller is available. However, the approach to the fuzzy logic controller is complicated. In this paper, one previous established fuzzy logic controller is simplified for its real …
Experimental Study Of A Novel Subcooling Method Based On Liquid Desiccant Dehumidification For Vapor-Compression Refrigeration Systems., Xiaohui She, Yonggao Yin, Yimo Luo, Lindeman Brett, Dan Zhong, Xiaosong Zhang
Experimental Study Of A Novel Subcooling Method Based On Liquid Desiccant Dehumidification For Vapor-Compression Refrigeration Systems., Xiaohui She, Yonggao Yin, Yimo Luo, Lindeman Brett, Dan Zhong, Xiaosong Zhang
Faculty of Science & Technology (THEi)
Refrigerant subcooling could increase the refrigerating capacity and potentially improve the performance of refrigeration systems. In this paper, a novel subcooling method is experimentally studied for the first time in a hybrid vapor compression refrigeration system. In this system, condensation heat (~40 °C) is used to drive an integrated subcooling cycle to subcool the refrigerant leaving the condenser, which significantly increases the system performance. Changes in system performance are measured as functions of the following variables: the mass flow rates of the dehumidification air, ambient air, dehumidification solution, regeneration solution, and spraying water. Comparisons are made between the proposed system …
Investigation On The Regeneration Performance Of Liquid Desiccant By Adding Surfactant Pvp-K30., Tao Wen, Lin Lu, Chuanshuai Dong, Yimo Luo
Investigation On The Regeneration Performance Of Liquid Desiccant By Adding Surfactant Pvp-K30., Tao Wen, Lin Lu, Chuanshuai Dong, Yimo Luo
Faculty of Science & Technology (THEi)
The liquid desiccant cooling system (LDCS) is a promising alternative for the conventional vapor compression system due to its high energy efficiency. To enhance the mass transfer between the regeneration air and liquid desiccant in the regenerator, the paper firstly introduced a kind of surfactant called polyvinyl pyrrolidone (PVP-K30) which was added into the LiCl solution for better desiccant regeneration performance. The falling film characteristics and regeneration performance were investigated and compared with and without surfactant. The results indicated that the contact angle of desiccant solution on plate decreased from 58.5° to 28.0° by adding surfactant with 0.4% of concentration. …
Investigation On The Regeneration And Corrosion Characteristics Of An Anodized Aluminum Plate Regenerator., Tao Wen, Lin Lu, Hongxing Yang, Yimo Luo
Investigation On The Regeneration And Corrosion Characteristics Of An Anodized Aluminum Plate Regenerator., Tao Wen, Lin Lu, Hongxing Yang, Yimo Luo
Faculty of Science & Technology (THEi)
The traditional vapor compression cooling system (VCS) has been criticized for its heavy reliance on electricity consumption and limited control ability of humidity. Compared with the VCS, the liquid desiccant cooling system (LDCS) is more efficient by handling the sensible and latent load separately. The present study investigated the regeneration and corrosion characteristics of an anodized aluminum plate regenerator for the first time. Comparative tests were conducted to present the regeneration and corrosion characteristics of the normal and anodized regenerator. The influence of internal heating on the regeneration performance was also identified. The results showed that the corrosion rate was …
Inherent Operational Characteristics Aided Fuzzy Logic Controller For A Variable Speed Direct Expansion Air Conditioning System For Simultaneous Indoor Air Temperature And Humidity Control., Huaxia Yan, Yudong Xia, Xiangguo Xu, Shiming Deng
Inherent Operational Characteristics Aided Fuzzy Logic Controller For A Variable Speed Direct Expansion Air Conditioning System For Simultaneous Indoor Air Temperature And Humidity Control., Huaxia Yan, Yudong Xia, Xiangguo Xu, Shiming Deng
Faculty of Science & Technology (THEi)
Direct expansion air conditioning systems are widely installed in small-to medium- scale buildings due to their advantages of simple configuration, high energy efficiency and low cost to own and maintain. The two main targets of air conditioning operation include improving the system operational efficiency and energy efficiency. Stable system operational efficiency is directly related with the operation of electronic expansion valves and degree of superheat at the outlet of evaporator. In this paper, an adaptive DS controller is developed to improve the system operational efficiency based the experimental performance of a DX A/C system and reported. The adaptive DS controller …