• Title/Summary/Keyword: 외기부하저감 시스템

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Study on Fresh Air Load Reduction System by Using Geothermal Energy - Reducing Effect of a Fresh Air Load by Combining with Air-heated Solar Collector - (지열을 이용한 공조외기부하저감 시스템에 관한 연구 - 공기식 집열기와의 병용에 의한 공조외기부하저감 효과 -)

  • Son Won-Tug;Lee Sung
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.12
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    • pp.1218-1226
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    • 2004
  • This paper presents thermal behaviors and performances of a fresh air load reduction system by using earth tube system combined with air-heated solar collector. The earth tube system reduces a fresh air load by heat exchange with soil throughout the year. In the previous experimental research, it was clarified that the earth tube system was very useful as a fresh air load reduction system. However, since outlet temperature of the fresh air which was heated by earth tube system was below 15$^{\circ}C$ in winter, it is not suitable to introduce the fresh air into the place of residence directly. Therefore, a simulation model using the simple heat diffusion equation was used to examine a rising effect of outlet air temperature in winter by combining with air-heated solar collector. An improvement of annual performance by control of operation is also quantitatively examined. In conclusion, it is confirmed that its performance is improved by control of operation throughout the year and outlet air temperature rose by combining with air-heated solar collector.

A Study on the Correlation between Outdoor Air and Outlet Air Temperature in a Fresh Air Load Reduction System by Using Geothermal Energy (지열을 이용한 외기부하저감시스템의 외기온도와 출구온도의 상관관계 분석)

  • Son, Won-Tug;Park, Kyung-Soon
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.22 no.9
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    • pp.620-627
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    • 2010
  • This paper presents a feasibility study of a fresh air load reduction system by using an underground double floor space. The fresh air is introduced into the double slab space and passes through the opening bored into the footing beam. The air is cooled by the heat exchange with the inside surface of the double slab space in summer, and heated in winter. This system not only reduces sensible heat load of the fresh air by heat exchange with earth but also reduces latent heat load of the fresh air by ad/de-sorption of underground double slab concrete. In this paper, we investigated the correlation between outdoor air temperature and outlet air temperature in the system. In conclusion, from the results of the high correlation we proposed a equation of regression for the outlet air temperature in the system by using linear regression analysis.

Study on Fresh Air Load Reduction System by Using Geothermal Energy - Effect on Thermal Characteristic arid Air Pattern of System by Opening Configuration - (지열을 이용한 공조외기부하저감 시스템에 관한 연구 -지하피트 공간 내의 개구부 형상이 시스템의 열적 특성 및 기류성상에 미치는 영향-)

  • Son Won-Tug;Lee Sung
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.11
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    • pp.1092-1100
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    • 2004
  • This paper presents the effect of opening configuration on the thermal behavior and air pattern of earth tube system. The earth tube system is a fresh air load reduction system by using underground double floor space for air-conditioning. In order to analyze the effect of opening configuration on thermal performance of this system and air pattern in underground double floor space quantitatively, we used a model dealing with tree-dimensional profile of wind velocity and temperature in underground double floor space. In conclusion, it is confirmed that heat exchange of a fresh air is mainly performed with upper and lower wall in underground double floor space, and that heat exchange area increased by installing the opening near the wall.

Study on Designing and Installation Effect of Fresh Air Load Reduction by using Underground Double Floor Space-Experimental Result and Proposal of Numerical Model for Thermal Performance- (지열을 이용한 공조외기부하저감(空調外氣負荷低減)시스템의 설계 및 도입 효과에 관한 연구 -실측결과 및 열성능 예측을 위한 수치모델의 제안-)

  • Son, Won-Tug;Choi, Young-Sik
    • Journal of the Korean Society of Industry Convergence
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    • v.7 no.3
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    • pp.233-240
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    • 2004
  • This paper presents a feasibility study of a fresh air load reduction system by using an underground double floor space The system was introduced into a real building and was examined by the field measurement Judging from the measurements during three years(1999~2001), the state of the system operation was very stable through this period and it was clear that the system contributes to reduction of energy consumption for air-conditioning. Futhermore, a simulation model used the simple heat diffusion equation Was developed to simulate its thermal characteristics and performances The simulations resulted m air temperature in good agreement with the measurements. Also, from the result of numerical analysis, It is clear that the amount of heat supply by using this system is more than the amount of energy loss to the room above it. Therefore, it is concluded that this systems is very useful and the proposed numerical model can be used for the prediction of system thermal performance.

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Study on Designing and Installation Effect of Fresh Air Load Reduction System by using Underground Double Floor Space - Proposal of Numerical Model coupled Heat and Moisture Simultaneous Transfer in Hygroscopic - (지열을 이용한 공조외기부하저감(空調外氣負荷低減) 시스템의 설계 및 도입 효과에 관한 연구 - 증기 확산지배에 의한 열수분 동시 이동 수치모델의 제안 -)

  • Son, Won-tug;Choi, Young-sik
    • Journal of the Korean Society of Industry Convergence
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    • v.7 no.4
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    • pp.331-340
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    • 2004
  • This paper presents a feasibility study of a fresh air load reduction system by using an underground double floor space. The fresh air is introduced into the double slab space and passes through the opening bored into the footing beam. The air is cooled by the heat exchange with the inside surface of the double slab space in summer, and heated in winter. This system not only reduces sensible heat load of the fresh air by heat exchange with earth but also reduces latent heat load of the fresh air by ad/de-sorption of underground double slab concrete. In this paper, we used a model for evaluation of fresh air latent heat load reduction by hygroscopic of air to earth exchange system taking into account coupled heat and moisture transfer of underground double floor space. In conclusion it shows the validity of the proposed method for a design tool and the quantitative effect of the system.

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A Study on the Simplified Presumption Method for the Prediction of Cooling and Heating Performance in a Fresh Air Load Reduction System by Using Geothermal Energy (지열을 이용한 외기부하저감시스템의 냉각 및 가열효과 예측을 위한 간이추정법에 관한 연구)

  • Son, Won-Tug;Park, Kyung-Soon
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.22 no.9
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    • pp.628-634
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    • 2010
  • This paper presents a feasibility study of a fresh air load reduction system by using an underground double floor space. The fresh air is introduced into the double slab space and passes through the opening bored into the footing beam. The air is cooled by the heat exchange with the inside surface of the double slab space in summer, and heated in winter. This system not only reduces sensible heat load of the fresh air by heat exchange with earth but also reduces latent heat load of the fresh air by ad/de-sorption of underground double slab concrete. In this paper, we proposed a simplified presumption method for the prediction of cooling and heating performance in the system. In conclusion the proposed method has been verified by comparing with the calculated value of the numerical analysis model by using nonlinear two-dimension hygroscopic question.