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Planning and Design of Low-Power-Consuming Full-Outer-Air-Intake Natural Air-Conditioning System.
1Department of Electronic Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 10608, Taiwan.
Journal of Healthcare Engineering
|May 18, 2019
Summary
This study introduces a novel, low-power air conditioning system that uses only outside air for ventilation. It effectively improves indoor air quality (IAQ) and comfort without cross-contamination, offering a healthier living environment.
Area of Science:
- Environmental Engineering
- Building Science
- HVAC Systems
Background:
- Modern lifestyles lead to prolonged indoor occupancy (85-90%), increasing demand for comfortable indoor environments and air conditioning.
- Closed indoor spaces accumulate hazardous pollutants like carbon dioxide (CO2), formaldehyde (HCHO), and volatile organic compounds (VOCs), alongside outdoor contaminants, compromising indoor air quality (IAQ).
Purpose of the Study:
- To develop an innovative, low-power air conditioning system that enhances indoor air quality by utilizing exclusively outdoor air.
- To address cross-contamination issues inherent in traditional ventilation systems by completely separating intake and exhaust air streams.
Main Methods:
- Implementation of a full-outer-air-intake natural air-conditioning system with separate intake and exhaust pathways.
- Utilizing air and water for mass and energy exchange within the system.
- Designed airflow exceeding 300-500 CFM, with steam evaporation rates of 3.13-3.88 kg/hr and heat exchange capacity of 1,855-2,300 kcal/hr.
Main Results:
- Achieved sensible heat effectiveness ranging from 71% to 112%.
- Energy Efficiency Ratio (EER) values surpassed 14.05-17.42 kcal/W·h.
- The system demonstrated capability for both positive and negative pressure operation based on user requirements.
Conclusions:
- The developed system provides a solution for improving indoor air quality by supplying clean, fresh outdoor air with minimal power consumption.
- It effectively creates a comfortable and healthy indoor environment by mitigating indoor pollutants and cross-contamination risks.
- The system's design offers flexibility in pressure control, catering to diverse user and operational needs.
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