환기와 냉난방을 병용한 하이브리드 공조시스템 적용에 관한 연구 = (A) study on the application of the hybrid air-conditioning system integrated with ventilation and cooling/heating|RISS 상세보기

다국어 초록 (Multilingual Abstract)

In this study, a hybrid air-conditioning system using fan assisted natural ventilation and radiant floor cooling will be suggested. This system is based on the concept of utilizing both natural ventilation and radiant floor cooling. The concept of radiant floor cooling has been suggested by running chilled water using the plumbing installed for radiant floor heating in Korean housing. The difference between the existing radiant cooling system and hybrid air-conditioning system suggested by in this study can be summarized as the use of nature power.
In this system, when outdoor air is favorable, the outdoor air flows into indoors by natural ventilation which can be used to control indoor environment. Even though it is impossible for a higher outdoor temperature to cool a room by natural ventilation, outdoor air can still be introduced to supply the fresh air for indoors. In the meantime, the lower part of the room can be well cooled by a radiant floor cooling. However, the radiant floor cooling may cause condensation on a floor surface under hot and humid climate such as summer season in Korea. Thus, the fully controlled ventilation is needed during the operation of cooling system. The ventilation unit as a part of hybrid air-conditioning system has a dehumidification and pre-cooling features, as results the controlled fresh air introduced indoors when outdoor is unfavorable. This strategy is expected to be energy-efficient and to provide adequate thermal comfort and good air-quality in the room.
The following summarizes the findings presented in this study.
(1) Domestic climate analysis to examine the possibility of room environment control through natural ventilation, shows that adjustment to the room environment through nature ventilation is possible during much time from May to October.
This results indicate that domestic application of hybrid air-conditioning system using natural ventilation and air-conditioning was far possible rather than conventional air-conditioning system.
(2) Through investigation of an existing research of the hybrid air-conditioning system and weather data analysis, scheme of hybrid air-conditioning system that was suitable for domestic was made. Hybrid air-conditioning system proposed in this research access to a required ventilation demand through a natural ventilation or a mechanical ventilation. Also, outside air introduce minimum ventilation into indoor under disadvantage, this system minimizes cooling/heating load by introduction outdoor air through dehumidification and pre-heating, pre-cooling. Also, the hybrid air-conditioning system can realize a radiant floor cooling through the existent panel using heating pipe in the floor, and solve the problem of control response in indoor, and dehumidification on the floor surface. And it solves ventilation and air-conditioning at the same time.
(3) Possibility, as an air-conditioning system of the hybrid air-conditioning system that is proposed in this research through simulation, is examined about control of indoor environment, energy performance. As a result, hybrid air-conditioning system might increase latent load by outdoor introduction in summer, and increase heating load by outdoor introduction in winter, but performance of hybrid air-conditioning system is seen as better than conventional ventilation system.
(4) This study produced prototype of the hybrid air-conditioning system through using the simulation result and system performance examined through a laboratory experiment. To make out control algorithm, an experiment executed previously about discharge coefficient in opening, variation of ventilation rate by outdoor condition, temperature compensation, dehumidification, etc.
(5) Complete system control logic through experiment result of (4) was applied in this system, and it examined indoor environment under laboratory condition in summer. As a result, control mode in the system was converted well from mechanical ventilation to natural ventilation according to outdoor air condition, and ventilation rate was also regulated. Also, it confirmed that control of indoor temperature and control of condensation were operated properly.
(6) TRNSYS simulation was conducted to examine adaptability of this system to actuality apartment house. In case outdoor air condition is profitable, outdoor air of average 2 ACH flowed in. A variation of room temperature appeared greatly than that of existent air conditioner, but room temperature was controlled under setpoint. It was represented that energy consumption of the hybrid air-conditioning system reduced about 30 ~ 40% than conventional air-conditioning system.
Through results in this study, it is confirmed that hybrid air-conditioning system proposed in this research is a superior choice than conventional air-conditioning system in ventilation performance, control of indoor environment, cutback of the energy.

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국문 초록 (Abstract)

최근 몇 년 환기는 사회적으로 큰 이슈가 되었다. 공동주택의 기밀화로 인한 실내공기질 악화가 그 원인이다. 국내의 주거문화는 한옥에서 공동주택 형태로 지속적으로 변모하고 있으며 주거성능 또한 거주자의 요구에 부응하여 향상을 거듭하고 있다. 하지만, 공동주택은 경제적 논리 아래 건설사들의 영리추구, 공기단축을 목적으로 시공방법의 간편화는 접착제 등의 화학물질의 사용을 증가시켜 왔다. 최근 국가 경제력 향상에 따라 삶의 질은 향상되었으며 건강 및 웰빙(Well-being)에 관심을 갖게 되면서 주거공간 내에서의 오염물질 방출 및 실내공기질 악화는 거주자들에게 심각한 문제로 여겨지게 되었다.
정부는 건축법 개정을 통해 환기에 관한 법률을 개정하였으며 100세대 이상의 공동주택에 대해서 상시 일정환기회수를 충족시키도록 하였다. 하지만 주거환경의 특성을 고려하지 않은 단순히 환기량의 확보는 냉난방에너지의 증가 및 온열환경의 불균형을 초래하였다.
본 연구에서는 환기를 단순히 실내공기질 개선의 목적 이외에 거주자의 쾌적성 향상 또는, 실온제어에 활용하는 등의 문제를 해결하려고 하였다. 기후 특성을 분석하고 실내환경을 고려하여 환기와 냉난방의 제어개념을 도출하였으며 실험과 시뮬레이션을 통해 시스템의 성능 및 적용방법에 대해 검토하고 있다.

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최근 몇 년 환기는 사회적으로 큰 이슈가 되었다. 공동주택의 기밀화로 인한 실내공기질 악화가 그 원인이다. 국내의 주거문화는 한옥에서 공동주택 형태로 지속적으로 변모하고 있으며 주...

목차 (Table of Contents)