Energy Analysis of a Novel Ejector-Compressor Cooling Cycle Driven by Electricity and Heat (Waste Heat or Solar Energy)

Riaz, Fahid; Tan, Kah Hoe; Farooq, Muhammad; Imran, Muhammad; Lee, Poh Seng

doi:10.3390/su12198178

Cited by 14 publications

(9 citation statements)

References 39 publications

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“…A major portion of generated power goes to the building sector for heating and cooling purposes. Studies reveal that one third of total greenhouse gases is emitted by the building sector itself [5,6]. On the other hand, approximately 40% of all global energy is used in the building sector, out of which over 60% energy is consumed for the heating and cooling of buildings [7].…”

Section: Introductionmentioning

confidence: 99%

Modelling Framework for Reducing Energy Loads to Achieve Net-Zero Energy Building in Semi-Arid Climate: A Case Study

Azam,

Farooq,

Munir

et al. 2023

Buildings

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Buildings consume a significant 40% of global energy, where, reducing the building energy consumption to a minimum, virtually zero, has become a thriving research area. Accordingly, this research aimed to determine and portray the huge potential of energy conservation in existing structures by making a retrofit at relatively low costs in finance strained economies. A walk-through of the survey of energy consuming appliances determined the energy consumption based on the power rating; the appliances were then virtually replaced and the reduced energy consumption was determined in terms of the cooling loads. Modelling these intervention using the hourly analysis program (HAP) showed significantly positive results. The pre- and post-retrofit model analysis of an institutional building in Pakistan exhibited significant potential for reducing the cooling load of 767 kW (218 TON) to 408 kW (116 TON) with an investment payback period of 2.5 years. The additional benefit is the reduced greenhouse gas (GHG) emissions which reduce the overall energy requirements. The study continues with the design of a solar energy source using the system advisor model (SAM) for the reduced energy demand of a retrofitted building. It is then concluded that using the available area, a solar energy source with a capital payback period of 5.7 years would bring an institutional building within its own energy footprint making it a net-zero building, since it will not be consuming energy from any other source outside of its own covered area. The study has the limitation to exposure and climate related conditions. In addition, the decline in heating and cooling loads represents model values which may vary when calculated after an actual retrofit for the same structure due to any site related issues.

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Section: Introductionmentioning

confidence: 99%

Modelling Framework for Reducing Energy Loads to Achieve Net-Zero Energy Building in Semi-Arid Climate: A Case Study

Azam,

Farooq,

Munir

et al. 2023

Buildings

Self Cite

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“…Therefore, in their work it is not a priority to improve the secondary pressure of the device. Fahid Riaz et al [17] integrated an ejector in their cooling cycle-driven model in pursuance of improving their COP for the model.…”

Section: Introductionmentioning

confidence: 99%

Multi-Factor Design for a Vacuum Ejector Improvement by In-Depth Analysis of Construction Parameters

Macia¹,

Castilla²,

Gamez-Montero³

et al. 2022

Sustainability

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A vacuum supersonic ejector is an indispensable pneumatic device placed in nearly all industrial production lines. This device, also called a zero-secondary flow ejector, is characterized by the maximum entrained flow and the minimum secondary pressure. Numerical simulations were carried out by means of the CFD toolbox OpenFOAM v8 and its solver HiSA, which uses the AUSM+up upwind scheme. A single-factor analysis of eight parameters was performed to find how the ejector’s performance was enhanced or decreased, while other parameters were fixed. Four parameters were subject to further analysis to find the geometry that improves the standalone performance of the ejector. The mixing chamber length is the parameter that most improves its performance; alone it leads to a 10% improvement. A multi-factor analysis, based on a fractional factorial design, is carried out with the four relevant parameters. Results indicate that the multi-factor analysis enhances the performance of the ejector by 10.4% and the mixing chamber length is the factor that most influences the improvement. Although a multi-factor design improves the performance, no significant relevance has been detected with respect to the mixing chamber length improvement alone. The improved performance of this device leads to a reduction in operating time and, as a consequence, results in significant energy savings.

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“…In contrast, as shown in Figure 1b, the static ejector whose core component is nozzle has the advantages of simple structure, low costs, high stability, and the ability to operate with impurities. However, the isentropic efficiency of static ejector is rather low due to the substantial viscous loss caused by turbulent mixing [6][7][8][9]. Due to the issues of both devices mentioned above, the gas wave ejector (GWE) [10] which combines the benefits of expansion-compressor units and static ejector has received more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Study on the Performance of Collaborative Production Mode for Gas Wave Ejector

Zhao

et al. 2022

Sustainability

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Gas wave ejector (GWE) is an efficient ejection equipment using pressure waves to extract and transfer energy. However, at present, GWE is designed only for single condition, not fully utilizing the production capacity. The collaborative production mode using one equipment to work simultaneously under two different conditions was proposed to resolve this issue in this study, and was analyzed by combining numerical simulation and experimental test. The research results show that the collaborative mode almost has no effects on average total efficiency compared to single mode. In the range of tests, the efficiency difference between two modes is within 4.4%. The state parameters of the stable-pressure region (where channels are closed at both ends) on one condition are the initial parameters of the functional region on the other condition in collaborative mode, accounting for the difference between single and collaborative mode. The variations of performance parameters (ejection rate and the isentropic efficiency) with the medium-port pressure in collaborative mode was similar to that of the single mode. Thus, the performance parameters difference between two modes can be predicted by the relative relationship between the medium-port pressure and the average pressure in stable-pressure region of GWE in single mode. In conclusion, the collaborative mode improves the utilization of equipment while maintaining total efficiency, which can promote the popularization and application of GWE.

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Energy Analysis of a Novel Ejector-Compressor Cooling Cycle Driven by Electricity and Heat (Waste Heat or Solar Energy)

Cited by 14 publications

References 39 publications

Modelling Framework for Reducing Energy Loads to Achieve Net-Zero Energy Building in Semi-Arid Climate: A Case Study

Modelling Framework for Reducing Energy Loads to Achieve Net-Zero Energy Building in Semi-Arid Climate: A Case Study

Multi-Factor Design for a Vacuum Ejector Improvement by In-Depth Analysis of Construction Parameters

Study on the Performance of Collaborative Production Mode for Gas Wave Ejector

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