Energy efficiency of an air conditioning system coupled with a pipe-embedded wall and mechanical ventilation

How to reduce the energy consumption of the central air-conditioning is important for the building energy efficiency. The energy efficiency reconstruction of the central air-conditioning system on one library in Guangzhou is completed with the network control system self-developed. The operational control and operational management is integrated in the network control system. The energy consumption before and after reconstruction about the air-conditioning system of the library is detected and analyzed in the paper. The result shows the mode that operational control and operational management integrated has better energy efficiency.

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Modeling and Simulation of Heat Pump Air-Conditioning System using Ecofriendly Refrigerants

International Journal for Research in Applied Science and Engineering Technology ◽

10.22214/ijraset.2021.35145 ◽

2021 ◽

Vol 9 (VI) ◽

pp. 1166-1170

Author(s):

Ajay Landage

Keyword(s):

Energy Efficiency ◽

Comparative Analysis ◽

Physical Properties ◽

Heat Pump ◽

Air Conditioning ◽

Coefficient Of Performance ◽

Simulation Approach ◽

Alternative Refrigerants ◽

Air Conditioning System ◽

Selection Of

A simulation approach to heat pump systems is proposed in this paper. The evaluation of working fluids is conducted. Moreover, the selected refrigerants are used in the simulation. Subsequently, the system is analyzed in terms of the coefficient of performance (COP) and energy efficiency. Some alternative refrigerants, instead of R22 used R290 refrigerent. It is described the selection of refrigerants adapted to each utilization, based on the thermodynamic and -physical properties, the technological behaviour, costs and use constraints as principal aspects of the environmental protection. Also, it is performed a comparative analysis in function of the total equivalent warming impact (TEWI) for some possible substitutes of refrigerant R22 used in various refrigeration and heat pump systems.

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Air Conditioning System Design and Strategies for Improving Energy Efficiency – A Review

International Journal of Mechanical and Production Engineering Research and Development ◽

10.24247/ijmperdjun202126 ◽

2021 ◽

Vol 11 (3) ◽

pp. 315-324

Author(s):

Amina Ismail et al., Amina Ismail et al., ◽

Keyword(s):

Energy Efficiency ◽

System Design ◽

Air Conditioning ◽

Air Conditioning System

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Analysis of Reconstruction in Terms of CO2 Concentration

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.808.39 ◽

2019 ◽

Vol 808 ◽

pp. 39-45

Author(s):

Mária Budiaková

Keyword(s):

Mechanical Ventilation ◽

Air Quality ◽

Air Conditioning ◽

Natural Ventilation ◽

Ventilation System ◽

Short Term ◽

Air Conditioning System ◽

The Poor ◽

The University ◽

Concentration Limits

The paper focuses on the analysis of reconstruction in terms of CO2 concentration. The reconstruction at the university included the exchange of windows. The original windows were exchanged for the modern wood tight windows. Providing CO2 concentration in the interiors of a university is immensely important for the students of the university. Not exceeding CO2 concentration limits is necessary not only for the physiological needs of students but also for the required performance of students. Teaching is conducted during the whole day in the researched university schoolroom. The short-term natural ventilation during the breaks is noticeably not sufficient. After 15 minutes from the beginning of the lesson, students started complaining about the air quality and they had to open the windows. To point out the unsustainable state of the poor air quality during the day-long teaching and to be able to prove the officials the importance of the continuation of the reconstruction by building mechanical ventilation or air conditioning system, there were carried out the experimental measurements in the schoolroom. The device Testo 480 was used for the measurements. Obtained values of CO2 concentration are presented in the charts. Interestingly, this reconstruction significantly decreased the air quality. The admissible values of CO2 concentration were exceeded after the first hours of teaching. These values were worsening with each additional hour of teaching. Therefore, another reconstruction is needed to enable the transition from natural ventilation to the mechanical ventilation system. In the conclusion of this paper, there are principles how to design new schoolrooms. Furthermore, there are presented recommendations how to operate the existing schoolrooms.

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