Performance Evaluation and Energy Saving Potential of Windcatcher Natural Ventilation Systems in China

The paper is oriented on the analysis of the ventilation systems in schoolrooms. Correct and sufficient ventilation of schoolrooms is very important because students and pupils spend in the schoolrooms the majority of their time in school. In our schools the ventilation is incorrect and insufficient. The biggest problem is winter period when the ventilation is provided only by opening the doors to corridor. This way, there is insufficient intake of oxygen, which causes distractibility and feeling of tiredness of pupils. In current schoolrooms we can use only natural ventilation and thus the schoolrooms have to be ventilated using windows. Therefore this research was focused on the comparison and the analysis of different systems of natural ventilation in schoolrooms. The experimental measurements were carried out in schoolroom, where the parameters of thermal comfort were measured in the different systems of natural ventilation with device Testo 480 which was connected to computer. Gained values of air temperature, air velocity and index PMV are presented in graphs. On the base of analysis of measured values were evaluated the systems of natural ventilation for schoolrooms. In the future, the mechanical ventilation in schoolrooms can be assumed, therefore the recommendation on modern energy saving system of mechanical ventilation is in the end of this paper.

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Performance evaluation and energy-saving potential comparison of a heat-powered novel compression-enhanced ejector refrigeration cycle with an economizer

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2017.11.106 ◽

2018 ◽

Vol 130 ◽

pp. 1568-1579 ◽

Cited By ~ 8

Author(s):

Yingjie Xu ◽

Ning Jiang ◽

Xiaohong Han ◽

Wenqiao Han ◽

Ning Mao ◽

...

Keyword(s):

Performance Evaluation ◽

Energy Saving ◽

Refrigeration Cycle ◽

Energy Saving Potential

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Thermal performance evaluation and energy saving potential of semi-transparent CdTe in Façade BIPV

Solar Energy ◽

10.1016/j.solener.2021.12.037 ◽

2022 ◽

Vol 232 ◽

pp. 84-91

Author(s):

Hameed Alrashidi ◽

Walid Issa ◽

Nazmi Sellami ◽

Senthilarasu Sundaram ◽

Tapas Mallick

Keyword(s):

Performance Evaluation ◽

Energy Saving ◽

Thermal Performance ◽

Energy Saving Potential

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Evaluating the Energy-Saving Potential of Solar Dedicated Ventilation Systems Based on ADRC

Applied Sciences ◽

10.3390/app8112328 ◽

2018 ◽

Vol 8 (11) ◽

pp. 2328 ◽

Cited By ~ 2

Author(s):

Lian Zhang ◽

Zijian Chen ◽

Lijuan Wang

Keyword(s):

Energy Saving ◽

Cooling System ◽

Ventilation System ◽

Gain Control ◽

Energy Saving Potential ◽

Active Disturbance Rejection ◽

Actual Operation ◽

Temperature Standard ◽

Control Accuracy ◽

Ventilation Systems

A solar dedicated ventilation system based on active disturbance rejection controller (ADRC) has been designed in this study and tested by experimental research to acquire better control accuracy and energy-saving potential compared with former systems. This system involves photovoltaic, solar thermal, and dedicated ventilation systems and ADRC. The solar energy replaces traditional energy to realize energy-saving potential, and ADRC takes the place of a conventional controller to gain control accuracy. The experimental results show that the temperature standard deviation is from 0.09 to 0.15 °C and difference between maximum and minimum is 0.33 to 0.49 °C (<0.5 °C) at different outdoor conditions to meet accurate control requirements. The results also show the energy-saving potential of the solar dedicated ventilation system as being equal to the power consumption of traditional systems, not including extreme situations. The solar dedicated ventilation system was used for actual operation of the cooling system of a laboratory precisely and efficiently. Consequently, the solar dedicated ventilation system based on ADRC is most suitable for hot and humid places to achieve the energy-saving objective.

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Energy saving potential of utilizing natural ventilation under warm conditions – A case study of Mexico

Applied Energy ◽

10.1016/j.apenergy.2014.05.035 ◽

2014 ◽

Vol 130 ◽

pp. 20-32 ◽

Cited By ~ 65

Author(s):

Ivan Oropeza-Perez ◽

Poul Alberg Østergaard

Keyword(s):

Energy Saving ◽

Natural Ventilation ◽

Energy Saving Potential

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Analysis of Incorporating a Phase Change Material in a Roof for the Thermal Management of School Buildings in Hot-Humid Climates

Buildings ◽

10.3390/buildings11060248 ◽

2021 ◽

Vol 11 (6) ◽

pp. 248

Author(s):

Ruey-Lung Hwang ◽

Bi-Lian Chen ◽

Wei-An Chen

Keyword(s):

Thermal Comfort ◽

Phase Change ◽

Energy Saving ◽

Natural Ventilation ◽

Phase Change Materials ◽

School Buildings ◽

Practical Utilization ◽

Energy Saving Potential ◽

Different Seasons ◽

Indoor Comfort

Strategies to reduce energy consumption are presently experiencing vigorous development. Phase change materials (PCMs) are novel materials that can reduce indoor temperatures via the change in material phase. Regarding the situation in Taiwan, there is no practical utilization of PCMs in school buildings at present, especially in combination with rooftops. In this paper, we discuss the feasibility and utilization potential of installing PCMs in the rooftops of school buildings. School buildings located in northern and southern Taiwan (Taipei and Kaohsiung) were selected to analyze the energy-saving potential and optimization of indoor thermal comfort by installing PCMs with different properties in rooftops over two time periods, including the air conditioning (AC) and natural ventilation (NV) seasons. Based on the simulation results, the feasible patterns of PCM simultaneity are found to be appropriate for improved indoor comfort and energy saving during the different seasons. Specifically, the efficient phase change temperature (PCT) for different PCM thicknesses is clarified to be 29 °C. The economic thickness of PCM was clarified to be 20 mm for Taipei and Kaohsiung. Through the recommendations proposed in this study, it is expected that the PCMs may be efficiently implemented in school buildings to realize the goal of energy conservation and improve thermal comfort.

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