事務所建物 空調設備의 豫防保全 最適點檢周期가 信賴性向上 및 期待利益에 미치는 영향

곽노열,박병윤,손장열 대한건축학회 2003 대한건축학회논문집 Vol.19 No.5

In this study, using Monte Carlo simulation about inspection model applied practically in air-conditioning facilities of office building, the optimal preventive maintenance inspection period is suggested to improve the reliability of the units, and effect on expected profit of optimal preventive maintenance inspection period is computed. The main results of this study are summarized as follows: 1) Simulation program for sensitivity analysis and optimal preventive maintenance inspection period is made, in order to execute precisely sensitivity analysis of maintenance factors, by using Monte Carlo simulation's flow chart and compute optimal preventive maintenance inspection period. 2) Using models for the relationship between reliability and inspection frequency per unit time and model between inspection and expected profit of preventive maintenance by CBM, the optimal preventive maintenance inspection period of air-conditioning facilities is computed, and it is revealed that the range of that is 90∼175 hr and, correlation curve of the original MTBF and optimal preventive maintenance inspection period by CBM is derived. 3) And effect on expected profit of preventive maintenance's activity by optimal preventive maintenance inspection period is computed. It is found that the larger the original MTBF, like MTBF of centrifugal compression chiller and AHU is, and the smaller the expected profit increased, and the smaller the original MTBF, like MTBF of boiler, absorption chiller and turbo case cooling tower is, and larger the expected profit increased.

공동주택에 적용되는 공기식 열교환기의 성능평가에 관한 연구

김상민,안병욱,손장열 대한건축학회 2005 대한건축학회논문집 Vol.21 No.3

Indoor Air Quality has been significantly degraded due to the improvement of the airtightness of residential and commercial combined high-rise apartment buildings. In order to handle the problems related to insufficient ventilation, the application of mechanical ventilation system is required in detached residences or apartments in the country. As an alternative, air-to-air heat recovery ventilators are used at initial stage for energy conservation using waste heat recovery and the improvement of IAQ in high-rise apartments, currently being more widely used even in apartments and detached residences. Due to this trend, relevant institutes and organizations are making standards for the evaluation of HRV(Heat Recovery Ventilator) performance, but research related to the evaluation of HRV performance are not sufficiently done in this circumstance before applying in real buildings. Therefore, the purpose of this study is to compare and evaluate international and domestic standards for the evaluation of HRV performance, and to provide guideline for the adequate selection of effective HRV by evaluating the performance synthetically in terms of major items.

겨울철 주택내 유기화합물 공기오염농도에 관한 측정연구 : 서울시내 96채의 주택을 대상으로 In case of 96 houses in Seoul

전정윤,박준석,손장열,池田耕一 대한건축학회 2004 대한건축학회논문집 Vol.20 No.5

Measurements on indoor organic compounds air pollution level in 96 houses were conducted. Houses which measurement carried out were collected based on the survey results about house type and constructed year in Seoul city. Indoor air organic compounds were monitored with two diffusive samplers. One was a cartridge treated with 2,4-initrophenylhydrazine for aldehydes sampling. The other was a passive charcoal tube for VOCs sampling. Two samplers were simultaneously exposed in living room during 24 hours. Aldehydes extracted with 2ml acetonitrile from the cartridge were analyzed by HPLC equipped with an UV diode array detector. VOCs were extracted with 2ml carbon disulfide from the charcoal tube by shaking and then analyzed by chromatograph and mass selective detector. The main Results were as follows; 1) Formaldehyde were detected in more than 90% of all homes, and average value of detected level was 54.92ppb. This alue is lower than ASHRAE guideline (100ppb) and WHO guideline (80ppb). 2) Toluene were detected in all homes, and EthylAcetate, 1-Butanol, ethylbenzene, p-Xylene, D-limonen were detected more than 50% of all homes. 24 hours averaged level of sum of VOCs was 179.96㎍/㎥, and this value is lower than WHO‘s TVOC(Total Volatile Organic Compounds) guideline (300㎍/㎥). 3) Mostly frequent detective level of formaldehyde was between 50-60㎍/㎥, and 84.09% of all homes showed lower level than WHO guideline. 4) Mostly frequent detective level of sum of VOCs was between 100-150㎍/㎥, and 86.46% of all homes showed lower level than WHO's TVOCs guideline.

공동주택의 칸막이벽 차음성능 평가에 관한 연구

김윤재,조창근,손장열 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

The aim of this research is to evaluate the sound insulation performance of partition walls in the SRC and the RC structured apartments through the field measurement. The sound insulation of dryly constructed partition walls in the SRC constructured apartments and wetly constructed ones in the RC constructured apartments were measured in the field and compared with each other in the SRC and the RC structured apartments respectively. The results are estimated by the standard of the Architectural Institute of Japan for D value. The sound insulation performance of partition wall among houses "A" and "B" SRC apartment is respectively D-45, D-55, These values satisfied with 2 grade and special grade respectively. The "C" and the "D" RC apartment ranked D-40 and D-45 that satisfied with 3 grade and 2 grade respectively.

건물구조체의 통기시스템을 이용한 냉ㆍ난방부하 저감효과 및 경제성 평가

심상권,이승언,손장열 대한건축학회 2004 대한건축학회논문집 Vol.20 No.4

To evaluate the energy efficiency of the building envelopes with ventilated cavity, the reduction on cooling load and heating load were analyzed with ESP-r simulation program which is possible to interpret the energy consumption on various types of building envelopes. For the economic assessment of the ventilated cavity in the internal part of the office building envelope, the column & spandrel type was compared with the conventional curtain wall. The result of the computer simulation shows that 11.2~13.7% of the cooling & heating energy can be reduced in building envelope with ventilated cavity.

현장측정에 의한 공기조화기 에어필터의 성능 평가

정용호,박병윤,손장열 대한건축학회 2004 대한건축학회논문집 Vol.20 No.7

Air filters of air conditioning system play a main role in improving indoor air quality. However there is not enough information about air filters and any official maintenance standards or guidelines for air filters in Korea. The aims of this study are proposal for air filter test methods after installation and basic data about air filter maintenance guidelines or standards. In this study, arrestances, pressure losses and microorganisms between the upstream and the downstream of air filters were measured with digital dust indicators, a micro manometer and blood agar plates. Measurements were conducted before and after washing out pre filters and outdoor air untake ratio varied between 10%, 20% and 30% under actual operating conditions. The results of this study is as follows. Arrestance increased depending on whether the input of outdoor air was added. However some cases did not follow the trend. Pressure loss decreased depending on whether the input of outdoor air was added to AHUs which have built-out type return fans and vice versa in the built-in type. In contrast, the colony counts of microorganisms increased in the downstream of air filters. The rates of increase dropped depending on the addition of the input of OA. Arrestance increased, pressure loss decreased and the rates of increase of microorganisms dropped after washing out prefilters. Medium filter replacement is the main factor for arrestance, prefilter replacement or washing is the main factor for microorganisms but the range of fluctuation in differential pressure was hard to recognize as 1∼4mmAq. As for the results, proper maintenance for air filters, periodical washing out prefilters are important and development air filter performance test methods, standards or guidelines of dust concentration and microorganisms in AHUs after installation are required.

지하저장시설 통기순환형 결로발생유도시스템에 관한 실험적 연구 : 군 이글루 탄약고를 중심으로 Focused on Igloo Type Ammunition Storage Facility

심상권,이승언,손장열 대한건축학회 2004 대한건축학회논문집 Vol.20 No.5

The objective of this study is to estimate applicability and performance of the Condensation Induction System by the experiment. This system consisted of the dehumidification system, thermal exchange system and air rotation apparatus. The concept of this system is to remove water vapor in room air of the powder magazine taking advantage of the existing wall and the condensation production apparatus(dehumidification system), and to make dry stored goods and room by circulating high dry air through the thermal exchange system. The results show that the Condensation Induction System dehumidified sufficiently the room and prevented an corrosion of stored ammunition. The dehumidification effect per one power[W] of this system is three times as much as that of the existing ready-made dehumidifier.

건축물 건설단계에서의 에너지소비량 및 CO₂배출량 원단위 산출

김종엽,이승언,손장열 대한건축학회 2004 대한건축학회논문집 Vol.20 No.10

The purpose of this study is to establish the database that could be applied to the building LCA Firstly, in this paper, the methodologies of building LCA and energy based I/O model for estimating embodied energy of building materials were examined Then, the intensity of energy consumption and CO₂ emission for building materials and construction stage were estimated The intensity database for building materials calculated by the I/O table published in 2000 was compared with the database by the I/O table published in 1995 According to the result of comparison, there were a little differences between the results calculated by the new and the previous data, and two results showed nearly the same patterns So, it could be said that the industrial activity change has little effect on the energy intensity of building materials during the past 5 years For the calculation of the energy intensity in the construction stages, the payment documents of an ad and electricity consumptions during construction for the sample buildings were surveyed and the intensity per a building gross area were calculated The database presented in this paper could be applied to the building LCA process as the basic data for analysing global worming effect caused by building construction

서울시 주택내 휘발성 유기화합물 공기오염농도의 계절변화에 관한 연구

전정윤,박준석,손장열 대한건축학회 2005 대한건축학회논문집 Vol.21 No.3

For the purpose of examining about seasonal change in concentration of indoor organic compounds in Seoul, 96 houses in the winter and 49 houses in the summer were investigated. Indoor organic compounds concentration were measured and survey was performed by questionnaire. Indoor organic compounds were monitored with two diffusive samplers. One was a cartridge treated with 2,4-dinitrophenylhydrazine for aldehydes sampling. The other was a passive charcoal tube for VOCs sampling. Two samplers were simultaneously exposed in living room during 24 hours. Aldehydes extracted with 2㎖ acetonitrile from the cartridge were analyzed by HPLC equipped with an UV diode array detector. VOCs were extracted with 2㎖ carbon disulfide from the charcoal tube by shaking and then analyzed by chromatograph and mass selective detector. The main Results were as follows. (1) Both of Formaldehyde and VOCs concentration in the summer are lower than that in the winter. This is because of increasing ventilation rate according to the opening of windows in the summer. (2) Formaldehyde, toluene and ethylbenzene were indicated as the major indoor volatile organic compounds in Seoul Residence. (3) There were 10 times of deference in concentration between non-occupied new house and that of post-occupied. (4) There was no significant relation between house type and indoor concentration.

실물실험에 의한 통기구조를 가진 외벽체의 에너지 성능평가 및 예측모델 개발

심상권,이승언,손장열 대한건축학회 2004 대한건축학회논문집 Vol.20 No.3

This field-based study focused on evaluating the thermal performance in building envelope with ventilated cavity, which is set in the internal part of the conventional curtain wall. The fire resistance, the airtightness and the insulation efficiency were evaluated through mock-up tests. Temperature and air velocity were measured and analyzed by CFD according to the mechanical or natural control of the ventilated cavity. We made a regression model based on the results of this study to predict the rate of temperature drop on the curtain wall with ventilated cavity in summer.