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1. Development of a high performance static air mixer with a short mixing distance

Author:
Lim, Seok-Young; Chang, Hyun-Jae
Source:
Journal of cleaner production 2019 v.224 pp. 686-696
ISSN:
0959-6526
Subject:
air conditioning,   etc   ; air; fluid mechanics; mixing;     Show all 4 Subjects
Abstract:
... Air mixing in an air mixing chamber affects an air-conditioning system's performances. Low air mixing effectiveness is associated with several problems. In this study, modified statistical air mixing effectiveness is proposed. An experimental study and CFD (Computational fluid dynamics) simulation were conducted for the development of high performance static air mixer over a short mixing distance. ...
DOI:
10.1016/j.jclepro.2019.03.245

2. Optimization on ejector key geometries of a two-stage ejector-based multi-evaporator refrigeration system

Author:
Yan, Jia; Wen, Na; Wang, Ling; Li, Xianbi; Liu, Zhan; Li, Shengyu
Source:
Energy conversion and management 2018 v.175 pp. 142-150
ISSN:
0196-8904
Subject:
air conditioning,   etc   ; geometry; mixing; refrigeration;     Show all 4 Subjects
Abstract:
... A three-evaporator and dual-ejector refrigeration system was presented in this paper. By combining two single ejectors as a whole, the authors attempted to discuss the effects of key geometric dimensions of each stage on both stage performances with two-dimensional CFD simulation method. First, the CFD models were validated by experimental data. Then, the primary nozzle diameters of both stages we ...
DOI:
10.1016/j.enconman.2018.08.110

3. A quantitative relationship between heat gain and local cooling load in a general non-uniform indoor environment

Author:
Liang, Chao; Li, Xianting; Melikov, Arsen Krikor; Shao, Xiaoliang; Li, Baoming
Source:
Energy 2019 v.182 pp. 412-423
ISSN:
0360-5442
Subject:
air conditioning,   etc   ; air; air temperature; cooling; heat; ventilation systems;     Show all 6 Subjects
Abstract:
... Reasonable quantification of space cooling load is helpful to utilize effectively the ventilation systems in a built environment. Studies have shown that the local cooling load (LCL) in a general non-uniform indoor environment is typically not equal to the heat gain. However, the quantitative relationship between heat gain and LCL is still unclear. Based on the analytical expression of non-uniform ...
DOI:
10.1016/j.energy.2019.06.055

4. Strategies for thermal comfort in university buildings - The case of the faculty of architecture at the Federal University of Bahia, Brazil

Author:
Costa, Maria Lívia; Freire, Marcia Rebouças; Kiperstok, Asher
Source:
Journal of environmental management 2019 v.239 pp. 114-123
ISSN:
0301-4797
Subject:
air conditioning,   etc   ; buildings; climate; equipment; interviews; natural ventilation; refining; Brazil;     Show all 8 Subjects
Abstract:
... Buildings constructed according to bioclimatic architectural principles in amenable climates have often experienced posterior interventions that have closed ventilation openings for the installation of air conditioning units.The present work sought to investigate the reasons for installing air conditioning equipment in buildings even under adverse economic conditions and with the awareness of thei ...
DOI:
10.1016/j.jenvman.2019.03.004

5. Novel experiments on COP improvement of thermoelectric air coolers

Author:
Dizaji, Hamed Sadighi; Jafarmadar, Samad; Khalilarya, Shahram
Source:
Energy conversion and management 2019 v.187 pp. 328-338
ISSN:
0196-8904
Subject:
air conditioning,   etc   ; coolers; electric power; equipment performance; heat;     Show all 5 Subjects
Abstract:
... Although individual commercial thermoelectric module has been widely investigated and its cooling behavior is clear, jointed thermoelectric modules show completely different cooling behavior and higher coefficient of performance (without the change of input electrical power) which requires further study. At the first step of this research, cooling characteristics of 2-jointed, 4-jointed and 6-join ...
DOI:
10.1016/j.enconman.2019.03.025

6. An integrated model predictive control approach for optimal HVAC and energy storage operation in large-scale buildings

Author:
Bianchini, Gianni; Casini, Marco; Pepe, Daniele; Vicino, Antonio; Zanvettor, Giovanni Gino
Source:
Applied energy 2019 v.240 pp. 327-340
ISSN:
0306-2619
Subject:
air conditioning,   etc   ; buildings; energy; heating systems; uncertainty; ventilation systems;     Show all 6 Subjects
Abstract:
... This paper deals with the problem of cost-optimal operation of smart buildings that integrate a centralized HVAC system, photovoltaic generation and both thermal and electrical storage devices. Building participation in a Demand-Response program is also considered. The proposed solution is based on a specialized Model Predictive Control strategy to optimally manage the HVAC system and the storage ...
DOI:
10.1016/j.apenergy.2019.01.187

7. On using the minimum energy dissipation to estimate the steady-state of a flow network and discussion about the resulting power-law:application to tree-shaped networks in HVAC systems

Author:
Soto-Francés, Víctor-Manuel; Pinazo-Ojer, José-Manuel; Sarabia-Escrivá, Emilio-José; Martínez-Beltrán, Pedro-Juan
Source:
Energy 2019 v.172 pp. 181-195
ISSN:
0360-5442
Subject:
air conditioning,   etc   ; energy; entropy; heating systems; pipes; ventilation systems;     Show all 6 Subjects
Abstract:
... The paper analyses how to compute the steady-state flow distribution through a given network by using the Minimum Entropy Production (MinEP) principle. For isothermal and incompressible flows, this is equivalent to the minimal dissipation of energy. The conditions that make this method equivalent to the conventional one are studied. There must exist a power-law for the energy dissipation (entropy ...
DOI:
10.1016/j.energy.2019.01.060

8. Model Predictive Control of Active Thermal Storage considering Indoor Environment for Building Proactive Demand Response in Smart Grids

Author:
Tang, Rui; Wang, Shengwei
Source:
Applied energy 2019
ISSN:
0306-2619
Subject:
air conditioning,   etc   ; buildings; case studies; cold storage; energy; models; temperature;     Show all 7 Subjects
Abstract:
... Demand response (DR) can effectively manage electricity use to improve the efficiency and reliability of power grids. Shutting down part of operating chillers directly in central air-conditioning systems can meet the urgent power reduction needs of grids. But during the special events of fast DR, how to optimally control the active cold storage considering the indoor environment of buildings and t ...
DOI:
10.1016/j.apenergy.2019.03.038

9. Experimental study on absorption/compression hybrid refrigeration cycle

Author:
Jianbo, Li; Shiming, Xu; Xiangqiang, Kong; Kai, Liu; Fulin, Cui
Source:
Energy 2019 v.168 pp. 1237-1245
ISSN:
0360-5442
Subject:
air conditioning,   etc   ; absorption; air temperature; automobiles; gases; heat; refrigeration;     Show all 7 Subjects
Abstract:
... A novel air-cooling bubble absorption/compression hybrid refrigeration experimental set-up of 3 kW was designed and assembled, using R124-DMAC as working fluids. The described refrigeration system could be powered by exhaust gases heat and power from vehicle engine to supply cooling demands for automobile air-conditioning or transport refrigeration. The characteristics and performance of the refri ...
DOI:
10.1016/j.energy.2018.11.093

10. Study of thermoelectric and photovoltaic facade system for energy efficient building development: A review

Author:
Irshad, Kashif; Habib, Khairul; Saidur, R.; Kareem, M.W.; Saha, Bidyut Baran
Source:
Journal of cleaner production 2019 v.209 pp. 1376-1395
ISSN:
0959-6526
Subject:
air conditioning,   etc   ; buildings; energy conservation; energy efficiency; solar collectors; temperature;     Show all 6 Subjects
Abstract:
... Energy usage in buildings has become a critical issue due to increase in occupants’ time spent inside a building and use of energy intensive equipment for providing comfort. Utilization of an alternate source of energy can be considered one of the promising solutions to tackle this issue. In the present paper, a review of photovoltaic (PV) and thermoelectric (TE) technologies implemented for energ ...
DOI:
10.1016/j.jclepro.2018.09.245

11. In-vehicle airborne fine and ultra-fine particulate matter exposure: The impact of leading vehicle emissions

Author:
Campagnolo, Davide; Cattaneo, Andrea; Corbella, Leonardo; Borghi, Francesca; Del Buono, Luca; Rovelli, Sabrina; Spinazzé, Andrea; Cavallo, Domenico M.
Source:
Environment international 2019 v.123 pp. 407-416
ISSN:
0160-4120
Subject:
air conditioning,   etc   ; fuels; monitoring; particulate emissions; particulates; risk management;     Show all 6 Subjects
Abstract:
... Airborne particulate matter (PM) concentrations inside vehicle cabins are often extremely high compared to background levels. The present study was motivated by the fact that in the last few decades, the implementation of new emission standards has led to the reduction of vehicle particle emissions. This study addresses for the first time the relationship between leading vehicle (LV) emissions and ...
DOI:
10.1016/j.envint.2018.12.020

12. Experiment study on thermal performance of building integrated with double layers shape-stabilized phase change material wallboard

Author:
Zhu, Na; Hu, Naishuai; Hu, Pingfang; Lei, Fei; Li, Shanshan
Source:
Energy 2019 v.167 pp. 1164-1180
ISSN:
0360-5442
Subject:
air conditioning,   etc   ; air temperature; phase transition; summer; weather; winter;     Show all 6 Subjects
Abstract:
... Double layers shape-stabilized phase change material (SSPCM) wallboard could improve building indoor thermal comfort both in summer and winter. The exterior and interior layer was active in summer and winter, respectively. In order to study thermal performance of building integrated with double layers SSPCM wallboards in real weather conditions without air conditioner, two simplified experimental ...
DOI:
10.1016/j.energy.2018.11.042

13. Field investigation of a photonic multi-layered TiO2 passive radiative cooler in sub-tropical climate

Author:
Jeong, Shin Young; Tso, Chi Yan; Ha, Jimyeong; Wong, Yuk Ming; Chao, Christopher Y.H.; Huang, Baoling; Qiu, Huihe
Source:
Renewable energy 2020 v.146 pp. 44-55
ISSN:
0960-1481
Subject:
air conditioning,   etc   ; ambient temperature; automobiles; buildings; coolers; cooling; cost effectiveness; energy; photons; photovoltaic cells; relative humidity; shade; silica; solar energy; solar radiation; subtropics; titanium dioxide; China;     Show all 18 Subjects
Abstract:
... Cost reduction and enhanced cooling performance are strongly demanded for daytime passive radiative cooling due to its attractive cooling strategy that does not require any energy input. Its potential application varies widely from air conditioning systems for buildings, photovoltaic cells, electronic device cooling and automobiles. However, recently proposed daytime passive radiative coolers are ...
DOI:
10.1016/j.renene.2019.06.119

14. Parametric analysis of applying PCM wallboards for energy saving in high-rise lightweight buildings in Shanghai

Author:
Wang, Huakeer; Lu, Wei; Wu, Zhigen; Zhang, Guanhua
Source:
Renewable energy 2020 v.145 pp. 52-64
ISSN:
0960-1481
Subject:
air conditioning,   etc   ; buildings; climate; cold; construction industry; cooling; energy; energy conservation; financial economics; heat; humans; melting point; models; phase transition; renewable energy sources; summer; temperature; winter; China;     Show all 19 Subjects
Abstract:
... The lightweight building industry develops dramatically in recent years, however it has worse thermal comfort than traditional buildings due to its light thermal mass. A considerable amount of energy is consumed by the building sector in space heating and cooling. In addition, the building envelop can highly influence the energy consumption of buildings. Innovative technologies such as the phase c ...
DOI:
10.1016/j.renene.2019.05.124

15. Deep learning-based fault diagnosis of variable refrigerant flow air-conditioning system for building energy saving

Author:
Guo, Yabin; Tan, Zehan; Chen, Huanxin; Li, Guannan; Wang, Jiangyu; Huang, Ronggeng; Liu, Jiangyan; Ahmad, Tanveer
Source:
Applied energy 2018 v.225 pp. 732-745
ISSN:
0306-2619
Subject:
air conditioning,   etc   ; buildings; energy conservation; neural networks;     Show all 4 Subjects
Abstract:
... The fault diagnosis of air-conditioning systems is of great significance to the energy saving of buildings. This study proposes a novel fault diagnosis approach for building energy saving based on the deep learning method which is deep belief network, and its application potential in the air conditioning fault diagnosis field is investigated. Then, a parameter optimization selection strategy is de ...
DOI:
10.1016/j.apenergy.2018.05.075

16. Correction to: Air quality and passenger comfort in an air-conditioned bus micro-environment

Author:
Zhu, Xiaoxuan; Lei, Li; Zhang, Yinghui; Wang, Xingshen
Source:
Environmental monitoring and assessment 2018 v.190 no.9 pp. 527
ISSN:
0167-6369
Subject:
air conditioning,   etc   ; air quality; e-mail;     Show all 3 Subjects
Abstract:
... The original version of this article unfortunately contained an error in the affiliation section and an error of the email address of corresponding author. ...
DOI:
10.1007/s10661-018-6918-6

17. Effects of ejector geometries on performance of ejector-expansion R410A air conditioner considering cooling seasonal performance factor

Author:
Jeon, Yongseok; Jung, Jongho; Kim, Dongwoo; Kim, Sunjae; Kim, Yongchan
Source:
Applied energy 2017 v.205 pp. 761-768
ISSN:
0306-2619
Subject:
air conditioning,   etc   ; climatic factors; temperature;     Show all 3 Subjects
Abstract:
... The objective of this study was to investigate the effects of ejector geometries on the performance of an ejector-expansion air conditioner (EEAC) considering the cooling seasonal performance factor (CSPF). The performance of the EEAC using R410A was measured and analyzed by varying the compressor speed, outdoor-bin temperature, operating pressures, nozzle-throat diameter, and mixing-section diame ...
DOI:
10.1016/j.apenergy.2017.08.059

18. Experimental study on R32 leakage and diffusion characteristic of wall-mounted air conditioners under different operating conditions

Author:
Jia, Lizhi; Jin, Wufeng; Zhang, Yan
Source:
Applied energy 2017 v.185 pp. 2127-2133
ISSN:
0306-2619
Subject:
air conditioning,   etc   ; air; flammability; risk;     Show all 4 Subjects
Abstract:
... With good thermal performance and environmental characteristics, R32 is an alternative refrigerant of R22, but its application is limited by its flammability. In view of indoor security, this paper analyzed the leakage and diffusion of R32 of wall-mounted air conditioners under different operating conditions. The impact of air supply velocities and the leakage hole positions on the concentration d ...
DOI:
10.1016/j.apenergy.2016.01.041

19. PMV-based dynamic optimization of energy consumption for a residential task/ambient air conditioning system in different climate zones

Author:
Mao, Ning; Hao, Jingyu; He, Tianbiao; Song, Mengjie; Xu, Yingjie; Deng, Shiming
Source:
Renewable energy 2019 v.142 pp. 41-54
ISSN:
0960-1481
Subject:
air conditioning,   etc   ; air flow; air temperature; climatic zones; energy; energy conservation; renewable energy sources; China;     Show all 8 Subjects
Abstract:
... Considering the effects of climate zones on building energy, a numerical study was conducted to investigate the energy consumption of a bedroom task/ambient air conditioning (TAC) in different climate zones. In this study, a PMV-based operating strategy of TAC was proposed to dynamically control energy consumption during night. According to this operating objective, the TAC was operated at two con ...
DOI:
10.1016/j.renene.2019.04.099

20. Passive versus active learning in operation and adaptive maintenance of Heating, Ventilation, and Air Conditioning

Author:
Baldi, Simone; Zhang, Fan; Le Quang, Thuan; Endel, Petr; Holub, Ondrej
Source:
Applied energy 2019 v.252 pp. 113478
ISSN:
0306-2619
Subject:
air conditioning,   etc   ; buildings; economic costs; energy; equipment; heat; heating systems; models; temperature; ventilation systems;     Show all 10 Subjects
Abstract:
... In smart buildings, the models used for energy management and those used for maintenance scheduling differ in scope and structure: while the models for energy management describe continuous states (energy, temperature), the models used for maintenance scheduling describe only a few discrete states (healthy/faulty equipment, and fault typology). In addition, models for energy management typically a ...
DOI:
10.1016/j.apenergy.2019.113478