Energy performance of next-generation dedicated outdoor air cooling systems in low-energy building operations

Chen, Tianyi; Norford, Leslie K.

doi:10.1016/j.enbuild.2019.109677

Cited by 27 publications

(6 citation statements)

References 31 publications

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“…The simple flux equation for a membrane shows that for a constant production rate, as the surface area or permeance of the membrane increases, the pressure gradient across the membrane decreases, which (as the feed side pressure remains constant) increases the permeate pressure. It is obvious that increasing the permeate pressure will reduce the vacuum pump work and ultimately improve the efficiency of the air conditioning system 42 . Therefore, it turns out that the power consumption of the vacuum pump and the pressure ratio are very important factors in evaluating the performance of the membrane air conditioning system in terms of reducing temperature and power consumption.…”

Section: Resultsmentioning

confidence: 99%

“…It is obvious that increasing the permeate pressure will reduce the vacuum pump work and ultimately improve the efficiency of the air conditioning system. 42 Therefore, it turns out that the power consumption of the vacuum pump and the pressure ratio are very important factors in evaluating the performance of the membrane air conditioning system in terms of reducing temperature and power consumption.…”

Section: Results Of a Hybrid Approach: Structural Versus Operational ...mentioning

confidence: 99%

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An insight into hybrid membrane‐based air conditioning system performance using gray relational analysis methods: Structural versus operational parameters

Hashemifard

Abdollahi

Khosravi

et al. 2022

Env Prog and Sustain Energy

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Various parameters have an impact on the fresh air temperature and input power of a hybrid membrane-based air conditioning (HMBAC) system, such as pressure ratio, membrane selectivity, membrane permeance, membrane area, air flowrate of the dehumidification unit, and module length, number of fibers, and fiber outer diameter of the humidification unit, which comprise both operational and structural parameters. Therefore, in this study, the effects of these parameters on the system performance are examined separately based on a statistical approach. The importance order of each parameter and its contribution ratio are determined by using Taguchi method and ANOVA analysis. The optimum level for each input parameter is determined using statistical analysis for the fresh air temperature and input power. Then, for the simultaneous minimization of fresh air temperature and input power Taguchigray relational grade (GRG) is used. GRG revealed that membrane selectivity, pressure ratio, and membrane permeance with the contribution ratio of 37.87%, 32.51%, and 10.55%, respectively, are the most critical parameters of the multiperformance of an HMBAC system. Interestingly dehumidification from a humid airflow can be more effective when membranes with low selectivity and high permeability are used.In conclusion, the optimization outputs disclosed that both structural and operational parameters have significant effects on the performance of the HMBAC system and this optimization can be a helpful tool for designing a HMBAC systems to cover the optimal conditions to develop a sustainable membrane-based air conditioning system.

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Section: Resultsmentioning

confidence: 99%

Section: Results Of a Hybrid Approach: Structural Versus Operational ...mentioning

confidence: 99%

An insight into hybrid membrane‐based air conditioning system performance using gray relational analysis methods: Structural versus operational parameters

Hashemifard

Abdollahi

Khosravi

et al. 2022

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…Moreover, the DOAS-assisted SSLC achieved better thermal comfort and humidity compared to single-coil AHU, when these systems were controlled by the MPC. Moreover, using the previously model predictive control, Chen and Norford [21] applied the thermodynamic models to evaluate the energy efficiencies of future dedicated outdoor air-cooling systems, which was coupled with an energy recovery unit (desiccant) or a renewable energy attachment (membrane). Afterwards, they compare those efficiencies against the industry benchmark, which provided an insight into beneficial prospects as well as possible limitations of each factor relating to different time scales and locations.…”

Section: Introductionmentioning

confidence: 99%

Development and optimization of specially designed air ventilation system combined with thermoelectric and composite desiccant unit

Tongdee

Maneewan

Chirarattananon

et al. 2022

IJPEDS

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This research focused on the enhancement of a conventional air ventilation system by using monitoring control. A specially designed system was developed to optimize the current systems in order to improve the air quality and thermal comfort in buildings. Indoor parameters, such as temperature, humidity, and air pollution (CO2), were monitored and controlled. Researchers accumulated data and implemented performance analysis as a tool for assessing specially designed air ventilation systems. These practices were designed based on a concept that is dedicated outdoor air systems that were comprised of a composite desiccant unit in addition to a thermoelectric module to address tremendous latent and sensible loads of air inlet. The results of the experiment indicated that the 12 V of electrical supply to thermoelectric provided the highest COP of the system, and the temperature and humidity in the comfort zone was approximately 27 ๐C and 55%, respectively, due to this newly developed system. Furthermore, the CO2 levels were lower than 1000 ppm during this research study, which were in accordance with established standards of indoor air quality.

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“…The ventilation condensation systems that the current refrigeration systems have, from the point of view of energy efficiency, are considered outdated, mainly because they are systems that are mostly composed of ON-OFF controllers, which allow the electrical fans to operate only with the logic signals on and off (Batista et al 2014;Chen & Norford, 2020).…”

Section: Introductionmentioning

confidence: 99%

On/Off Control Versus PID Control: A Comparative Case Study On Condensers of Cooling Systems

Silva¹

2022

Proceedings of the 4th International Conference on Advanced Research in Applied Science and Engineering

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The exponential growth of industries makes energy efficiency a key factor to be considered, especially in industries that relies on equipment with a high demand of electrical power. Therefore, an analysis of device efficiency is one of the premises of the evolution of industrial equipment. A condenser is an equipment present in cooling systems that are used in small, medium and large organizations. Research and studies on the efficiency of this type of equipment becomes relevant, especially in countries that experience blackouts that reach cities and states, such as Brazil. In the present work, a case study of a local supermarket that uses industrial refrigeration systems was carried out, in which the performance of a control of an ON-OFF vs PID system was evaluated. After collecting the specific parameters of the fans, it was found that the control via PID became more efficient than the ON-OFF, with a considerably lower power consumption of about 26.35%, resulting in greater use of electrical energy and considerable savings for the organization.

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Energy performance of next-generation dedicated outdoor air cooling systems in low-energy building operations

Cited by 27 publications

References 31 publications

An insight into hybrid membrane‐based air conditioning system performance using gray relational analysis methods: Structural versus operational parameters

An insight into hybrid membrane‐based air conditioning system performance using gray relational analysis methods: Structural versus operational parameters

Development and optimization of specially designed air ventilation system combined with thermoelectric and composite desiccant unit

On/Off Control Versus PID Control: A Comparative Case Study On Condensers of Cooling Systems

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