Optimization on fresh outdoor air ratio of air conditioning system with stratum ventilation for both targeted indoor air quality and maximal energy saving

Cheng, Yong; Zhang, Sheng; Huan, Chao; Oladokun, Majeed Olaide; Lin, Zhang

doi:10.1016/j.buildenv.2018.10.009

Cited by 103 publications

(46 citation statements)

References 80 publications

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“…The thermal preferences of Subzones A, B, C and D are randomly produced [47] to be 0.23, -0.70, 0.52 and 0.65 respectively within ±0.75 (i.e., ω =0. 23, ω =-0.70, ω N =0.52, ω O =0.65 in Figure 3), which is consistent with Wang et al [21]. Thus, the conventional method controls the averaged thermal condition of the occupied zone as close to 0.18 (i.e., the averaged thermal preference of the subzones) as possible.…”

Section: Accepted Manuscriptsupporting

confidence: 86%

“…Although the thermal condition of each subzone can be directly measured, the measurements would increase the cost of the sensors in operation [17]. Moreover, the sensors might disturb the space usage and the occupants could affect the accuracy of the sensors [23]. These [30].…”

Section: Proposed Subzone Control Methodsmentioning

confidence: 99%

“…Due to the effects of heat sources, turbulence, etc., the thermal parameters (e.g., air temperature and velocity) in the occupied zone cannot be absolutely uniform, which can be evaluated by the air diffuser performance index (ADPI) [15]. Generally, the reference thermal parameters at one point or the averaged values of several points are used to represent the thermal condition of the occupied zone [9,22,23]. The supply air parameters are modulated to control the reference thermal parameters only, which essentially ignores the thermal non-uniformity in the occupied zone.…”

Section: Introductionmentioning

confidence: 99%

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Subzone control method of stratum ventilation for thermal comfort improvement

Zhang

Cheng

Oladokun

2019

Building and Environment

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S u b z o n e c o n t r ol m e t h o d of s t r a t u m v e n til a tio n fo r t h e r m al c o mfo r t i m p r ov e m e n t Z h a n g , S, C h e n g, Y, Ol a d o k u n, M O a n d Lin, Z h t t p:// dx. d oi.o r g/ 1 0. 1 0 1 6/j.b uild e nv.2 0 1 8. 1 1. 0 4 1 Ti t l e S u b z o n e c o n t r ol m e t h o d of s t r a t u m v e n til a tio n fo r t h e r m al c o mfo r t i m p r ov e m e n t A u t h o r s Z h a n g, S, C h e n g , Y, Ol a d o k u n, M O a n d Lin, Z Typ e Articl e U RL This ve r sio n is a v ail a bl e a t : h t t p:// u sir.s alfo r d. a c. u k/id/ e p ri n t/ 5 3 1 0 1/ P u b l i s h e d D a t e 2 0 1 9 U SIR is a di git al c oll e c tio n of t h e r e s e a r c h o u t p u t of t h e U niv e r si ty of S alfo r d. W h e r e c o py ri g h t p e r mi t s, full t e x t m a t e ri al h el d in t h e r e p o si to ry is m a d e fr e ely a v ail a bl e o nli n e a n d c a n b e r e a d , d o w nlo a d e d a n d c o pi e d fo r n o nc o m m e r ci al p riv a t e s t u dy o r r e s e a r c h p u r p o s e s . Pl e a s e c h e c k t h e m a n u s c ri p t fo r a n y fu r t h e r c o py ri g h t r e s t ri c tio n s. Fo r m o r e info r m a tio n, in cl u di n g o u r p olicy a n d s u b mi s sio n p r o c e d u r e , pl e a s e c o n t a c t t h e R e p o si to ry Te a m a t: u si r@ s alfo r d. a c. u k . AbstractThe conventional control method of a collective ventilation (e.g., stratum ventilation) controls the averaged thermal environment in the occupied zone to satisfy the averaged thermal preference of a group of occupants. However, the averaged thermal environment in the occupied zone is not the same as the microclimates of the occupants, because the thermal environment in the occupied zone is not absolutely uniform. Moreover, the averaged thermal preference of the occupants could deviate from the individual thermal preferences, because the occupants could have different individual thermal preferences. This study proposes a subzone control method for stratum ventilation to improve thermal comfort. The proposed method divides the occupied zone into subzones, and controls the microclimates of the subzones to satisfy the thermal preferences of the respective subzones. Experiments in a stratum-ventilated classroom are conducted to model and validate the Predicted Mean Votes (PMVs) of the subzones, with a mean absolute error between 0.05 scale and 0.14 scale. Using the PMV models, the supply air parameters are optimized to minimize the deviation between the PMVs of the subzones and the respective thermal preferences. Case studies show that the proposed method can fulfill the thermal

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Section: Accepted Manuscriptsupporting

confidence: 86%

Section: Proposed Subzone Control Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Subzone control method of stratum ventilation for thermal comfort improvement

Zhang

Cheng

Oladokun

2019

Building and Environment

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“…Since the CO 2 concentration is a good indicator of indoor air pollution in occupied spaces [37,44,60], it was used to evaluate the indoor air quality in the studied building. Following the ASHRAE 62.1 standard [48], the CO 2 generation rate was a function of the physical activity level of the occupants.…”

Section: Numerical Model Of Building Thermal Beahviourmentioning

confidence: 99%

Influence of the Airflow in a Solar Passive Building on the Indoor Air Quality and Thermal Comfort Levels

2019

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The influence of the airflow in a solar passive building on the indoor air quality and thermal comfort levels was investigated. The numerical study for a university library was conducted using a software that simulates the building thermal behavior with complex topology, in transient conditions, for evaluating the indoor air quality and occupants’ thermal comfort levels for typical summer and winter days. Solar radiation was used as a renewable energy source to increase simultaneously the thermal comfort and air quality levels and reduce building energy consumption. Regarding the solar passive building, consideration was given to all of the building structure envelope, shading devices and interior details, while in the solar active building active ventilation was used. To analyze the airflow that simultaneously provides the best indoor air quality and thermal comfort levels, a new integral methodology based on the minimization of the total number of uncomfortable hours was used. The results show that it was possible to determine an air change rate that ensures a good compromise between thermal comfort and indoor air quality. An optimal air change rate of two and three renewals per hour had been determined, respectively, for winter and summer conditions.

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“…The selected tool to its implementation was MATLAB Simulink (version R2017a, The MathWorks, Inc, Natick, MA, USA), due to its wide use in research and multiple available possibilities, and TRNSYS (version 17, Thermal Energy System Specialists, LLC, Madison, WI, USA) for the thermal modelling. TRNSYS is also used for research purposes when modelling buildings and HVAC systems, as in [39].…”

Section: Simulation Modelmentioning

confidence: 99%

Design and Simulation of an Energy Homeostaticity System for Electric and Thermal Power Management in a Building with Smart Microgrid

et al. 2019

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Nowadays, microgrids are gaining importance in electric power generation and distribution environments due to their flexibility, versatility, scalability and the possibility of supplying ancillary services when connected to the grid. They allow for the customization of electric supply for very different types of consumers. Therefore, a new control model for power and energy management based on homeostaticity of electric power systems (EPS) is presented, which has been already analyzed and approved by ENEL Chile in its developmental stage. ENEL, the largest electric utility in the country, is interested in incorporating smart microgrids in the electricity distribution market, as part of a worldwide policy. Such microgrids are to be installed in buildings serviced by ENEL. To demonstrate the model’s utility, a Simulink model of a real microgrid is used, which is comprised of PV generation, energy storage, an air conditioning (AC) equipment and thermal storage of the building upon which the microgrid is installed. The behavior of every element is simulated, including the dynamic thermal model of the building in order to optimize energy management and power supply versus consumption. The behavior of the whole system is analyzed under different environmental profiles and energy consumption patterns using the proposed homeostaticity system.

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Optimization on fresh outdoor air ratio of air conditioning system with stratum ventilation for both targeted indoor air quality and maximal energy saving

Cited by 103 publications

References 80 publications

Subzone control method of stratum ventilation for thermal comfort improvement

Subzone control method of stratum ventilation for thermal comfort improvement

Influence of the Airflow in a Solar Passive Building on the Indoor Air Quality and Thermal Comfort Levels

Design and Simulation of an Energy Homeostaticity System for Electric and Thermal Power Management in a Building with Smart Microgrid

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