Abstract
Outdoor air supply is required to maintain good indoor air quality (IAQ). For tropical or subtropical regions, warm and humid outdoor air would cause excess air-conditioning energy use. This study has proposed an integrated dedicated outdoor air system (IDOAS), which integrates the enthalpy exchange and outdoor air cooling into a unitary system. IDOAS could operate independently of central air-conditioning systems thus saving tremendous piping cost and energy needed to deliver chilled water to outdoor air unit in a conventional centralized system. An experimental unit of IDOAS was built to prove this novel concept. Enthalpy exchange efficiency was tested to be about 44%. The test results show that about 44% of energy needed to condition the outdoor air can be saved. A reverse Rankine refrigeration cycle was integrated to cool the outdoor air. Due to this integrated configuration, the air passing through the condenser would be at a lower temperature. The consequent lower refrigerant condensing temperature would improve the cooling cycle efficiency. The cooling coefficient of performance (COP) was improved by about 46%. In addition, the outdoor air could be conditioned to a lower humidity before being supplied to space, which would improve the thermal comfort. The test results of this novel IDOAS show that it could provide good air quality at lower energy use.
Highlights
Indoor air quality has become an indoor environment problem worldwide
In comparison to the outdoor air unit that coupled to a central system, integrated dedicated outdoor air system (IDOAS) was configured in a unique unitary system to integrate enthalpy recovery and a cooling system in a single housing
The test results showed that, after enthalpy exchange, outdoor air could be brought to a lower temperature and lower humidity, with the advantages of reducing the energy needed to condition the outdoor air
Summary
Indoor air quality has become an indoor environment problem worldwide. The Indoor Air. Mui et al [19] attempted to analyze the air-conditioning energy use in some Hong Kong office is strongly related to the outdoor air supply rate. This further shows that more fresh air ventilation would buildings. Mumma [21] further studied the feasibility of using DOAS to maintain a liquid desiccant method to dehumidify the outdoor air but the liquid desiccant method needed cooling building at a positive pressure preventing excess leakage of outdoor air. Was an attempt to investigate a mean of saving air-conditioning energy while maintaining good indoor air quality.ofA novel integrated unitary outdoor air Unit system (IDOAS) was studied, an.
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