• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회B
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• pp.3053-3058
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• 2008

We develop a heat exchanger modules for a multi-burner boiler. The heat exchanger module is kind of a heat recovery steam generator (HRSG). This heat recovery system has 4 heat exchanger modules. The 1st module consists of 27 bare tubes due to high temperature exhaust gas and the others consist of 27 finned tubes. The maximum steam pressure of each module is 1 MPa and tested steam pressure is 0.7 MPa. In order to test these heat exchanger modules, we make a 0.5t/h flue tube boiler (LNG, $40\;Nm^3/h$). We tested the heat exchanger module with changing the position of each heat exchanger module. We measured the inlet and outlet temperature of each heat exchanger module and calculated the heat exchange rate. The results show that if module C is placed at second stage (the 1st stage is always module O, bare tube module), there is no need to attach an additional heat exchanger module. In this case the exit temperature of module C is low enough to enter an economizer which is more effective in heat recovery than a heat exchanger module.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.771-778
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• 2006

Before the Flap type GATE is introduced until, the Turnstile type GATE was plentifully used. The Turnstile type GATE is used plentifully from the Seoul metro, Busan Transportation Corporation and Korea Railroad Corporation. From the Turnstile type GATE, the micro switch breakdown is occurred by the contact of the micro switch which perceives a Turnstile rotation and the cam. The breakdown is cause of the passenger inconveniently. In order to prevent the breakdown which is caused by Micro switch contact, Microswitch support used the sensor in Turnstile rotation perception. The sensor which is used in test is Photo Sensor and Reed Sensor two type. The test result Reed Sensor was suitable in underground environment. When using the RF card, RF card processing came to be quick