열전소자를 활용한 방호복 냉각장치 설계 연구 = A Study of the Design Method for the Cooling Equipment of Protective Clothing Using Thermoelectric Cooler

다국어 초록 (Multilingual Abstract)

In this study, a compact and portable cooling equipment applicable to protective clothing was developed using thermoelectric modules (TEMs) to ensure the thermal comfort of workers wearing protective clothing in harsh working conditions. The air circulation flow rate and thermal resistance of a plate-fin heat sink used to enhance the operating performance of TEMs were theoretically modeled to achieve a target cooling power estimated using the amount of heat released from the human body. The cooling power and COP of the fabricated cooling equipment were experimentally derived and analyzed according to the change in the number of TECs and applied voltage. When a voltage of 5 V was applied to the four TECs, a maximum cooling power of 33 W, a circulation air temperature reduction of 7.6°C, and a COP of 0.87 were obtained. When a voltage of 2 V was applied to the two TECs, the highest COP of 1.82 was obtained, achieving a cooling power of 9.93 W. Finally, when the developed cooling system was applied to a worker wearing a protective clothing, a cooling power of ~50 W and circulation air temperature reduction of ~13°C were obtained.

국문 초록 (Abstract)

본 연구에서는 기존 열전 냉각시스템의 낮은 열량제거 및 냉각성능(COP: coefficient of performance) 특성을 개선하여 방호복을 착용하고 열악한 상황에서 근무하는 작업자의 열적 쾌적성을 확보할 수 있는 휴대용 방호복 냉각장치를 개발한다. 목표 제거 열량을 달성하기 위해 순환 공기 유량과 방열핀 열저항을 이론적으로 모델링 하고, 이를 통해 설계·제작된 냉각장치의 성능검증 및 최적화를 위해 열전소자 개수와 인가전압 변화에 따른 제거 열량 및 COP를 도출하여 분석하였다. 병렬 연결된 4개의 소자에 5 V의 전압 인가 시 최대 33 W의 열량제거 및 7.6°C의 순환공기 냉각을 확인하였으며 이때의 COP는 0.87로 나타났다. 병렬 연결된 2개의 소자에 2 V의 전압인가 시 가장 높은 1.82의 COP를 획득하였으며, 이때의 제거 열량은 9.93 W로 나타났다. 방호복을 착용한 작업자에게 적용 시 ~13°C의 순환공기 온도 저감 및 ~50 W의 제거 열량을 확인하였다.

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