• 제목/요약/키워드: PMV thermal environment

검색결과 78건 처리시간 0.028초

老人福祉施設의 冬.夏節期 室內 溫熱環境 測定 및 溫熱感 評價 (An Study on the Evaluation of Thermal Indoor Environment and Thermal Sensations during Winter and Summer in Elderly Welfare Facilities)

  • 곽호;류우동;황광일;홍원화
    • 한국주거학회논문집
    • /
    • 제14권1호
    • /
    • pp.19-27
    • /
    • 2003
  • This study aims to survey the living spaces of the welfare facilities for the aged to get the objective relationships between the physical thermal environment and the users' subjective responses. The surveys were made twice in winter and once in summer during 2001 and 2002. An ambient temperature, relative humidity, air velocity, globe temperature were measured as physical elements of thermal environment and the ASHRAE Psychophysical Voting Scale were used as an evaluation index for subjective responses. As the results, the aged respond thermally comfortable, in spite of the differences among important factors such as thermal sensations, humidity sensations and air velocity sensations. Also the physical thermal environmental elements and the subjective responses indices exceed thermal comfort range calculated by PMV(Predicted Mean Vote) and PPD(Predicted Percentage Dissatisfied). It shows that the insulation of walls of the facilities is not enough for heating and cooling seasons, and the indoor environmental control is necessary.

난방시 가압식 바닥취출 공조방식의 실내온열환경 평가 (An Estimation on Indoor Thermal Environment by Pressurized Plenum Under Floor Air Conditioning System in Heating)

  • 최은훈;이용호;권영철;황정하
    • 한국태양에너지학회 논문집
    • /
    • 제30권4호
    • /
    • pp.92-99
    • /
    • 2010
  • The purpose of this study is to apply pressurized plenum under floor air conditioning system to office areas to understand characteristics of indoor thermal environment based on forms of diffusers. For doing this, the author conducted experiment of module measurement, and based on the results, analyzed indoor temperature distribution and velocity distribution based on direction of diffusion by using Computational Fluid Dynamics(CFD), and estimated the Predicted Mean Vote(PMV) of residents based on forms of diffusers to present the optimal air conditioning of the pressurized plenum under floor air conditioning system in heating. The results of this study are as follows. First, as for forms of diffusers, distributed diffusers rather than conical and grill diffusers were favorable in maintaining $24^{\circ}C$, the established temperature in heating, were active in velocity flowing, and were wide in a radius of diffusion. Second, as for position of pressurizing, the difference between upper and lower temperature was wider in center, lateral, and dispersed pressurizing (in order). As for velocity distribution, the velocity was more increased in lateral, center, and dispersed pressurizing(in order), indicating that dispersed pressurizing maintained uniform thermal environment. Third, as for diffusion direction, mixed direction showed less difference between upper and lower temperature and the difference in velocity between center and lateral part was 0.01m/1, indicating that it maintained uniform thermal environment. Fourth, as for the PMV of residents based on the forms of diffusers, the dispersed type showed(+) values above (0) when applied variably based on the position of diffuser, presenting thermal feeling of "being comfortable" to residents.

겨울철 온도 및 습도변화에 따른 온열쾌적감에 관한 연구 (A Study of Thermal Comfort by Winter Temperature Humidity Change)

  • 김세환;이성;김동규
    • 설비공학논문집
    • /
    • 제19권11호
    • /
    • pp.803-809
    • /
    • 2007
  • To those who spend most time within a room, comfortable indoor environment is a very critical element to job performance and health. The comfort technology, which is for enhancing comfort in human living, relates with various factors to ensure human activities efficient, comfortable, safe and satisfactory. Experiments were performed in environmental chamber. Experimental conditions were combinations from three temperatures of 18, 22 and 26C, and two relative humidity levels of 45 and 60%. Air-flow was controlled to 0.1m/s through the experiment. Four male and four female university students participated in the experiments. They had normal blood pressure and their body temperature was under $37^{\circ}C$. From the experiments for evaluating thermal sensation to the air-heating conditions, relationships among TSV, CSV, $SET^*$, PMV were analyzed. Results can be summarized as followings; Thermal neutrality $SET^*$ of man and female was $24.8^{\circ}C$. In air-heating condition, $SET^*$ values for thermal comfort zone were $23.0{\sim}26.5^{\circ}C$. These values were higher than the values from ASHRAE.

선실의 온열환경을 고려한 선박의 냉난방 시스템 설계 기법 (Thermal Environment-based HVAC Operating Design in Cabins on Naval Ships)

  • 장미숙;고창두;문일성;이춘주;김상현
    • 대한조선학회논문집
    • /
    • 제42권4호
    • /
    • pp.402-410
    • /
    • 2005
  • This paper focused on the analysis of the thermal comfort conditions in 1,000 ton class patrol ship's cabins through the evaluation of PMV(predicted mean vote) and PPD(predicted percentage of dissatisfied). Different areas have different clothing and activity in the ship. Therefore, any area may be thermally uncomfortable in case of air conditioning with equal temperature, relative humidity and relative air velocity. PMV or PPD-DCAC (demand controlled air conditioning) system is a new design that the whole cabins are maintainable with the ideal thermal comfort condition.

하계 인공환경실험에서의 온열쾌적특성 (Characteristics of thermal comfort for artificial environment experiment in summer)

  • 박종일;김경훈;홍희기;민병일;김창주
    • 설비공학논문집
    • /
    • 제10권3호
    • /
    • pp.368-377
    • /
    • 1998
  • The purpose of this study was to examine theory about indoor thermal comfort-environment as well as to determine thermal sensation and physiological responses for men in summer indoor environment, under various air temperature and relative humidity, with male university students. Subjective Evaluation, Heart Rate(Electrocardiogram), Electroencephalogram(EEG) were examined. We found that comfort of people was achieved at SE $T^{*}$ 24.7$^{\circ}C$, -0.82<PMV<0.93, subject's clothing(0.41c1o)and the difference of skin temperature was found at the calf area as air temperature changes. At low SE $T^{*}$, heart rate was decreased and at high SE $T^{*}$, heart rate was increased but there was no change EEG(keeping $\alpha$-wave).wave).

  • PDF

해양플랜트 사무공간의 공조 쾌적성 평가에 관한 연구 (The Study for Evaluation of thermal comfort in office on offshore)

  • 임홍석;김판중
    • 대한조선학회 특별논문집
    • /
    • 대한조선학회 2017년도 특별논문집
    • /
    • pp.67-72
    • /
    • 2017
  • This paper presents on the evaluation of thermal comfort in office on offshore. In living quarter of offshore, strict air conditioning performance is required to office on offshore and displacement ventilation is applied to office space which rooms are required to confirm the thermal environment. The computational fluid dynamics (CFD) is performed to calculate the temperature, air velocity in office and thermal comfort such as PPM & PPD is evaluated by the CFD result.

  • PDF

생태 공간 조성에 관한 기초 연구 -고령자를 대상으로 한 열환경 연구- (Basic Study on Creating Ecological Residence Space - A thermal environment study of the aged -)

  • 김동규;하병용;금종수;정용현
    • 수산해양교육연구
    • /
    • 제23권2호
    • /
    • pp.153-161
    • /
    • 2011
  • Creating standards on thermal environment has been organized traditionally based on the youth and the manhood who are in mainly active layer of a society. However, traditional creating standards have differences from the physiology of the aged who have weak physical ability than younger person. As a result, it causes a health problem of the aged. Therefore, In this study, we had a basic study to create a comfortable thermal environment which had considered to a physical ability and a physiology of the aged, and build a ecological residence space to maintain health. We had several experiments with the aged; Experiment, Comfort Sensation Vote, Mean Skin Temperature and Analyzing HRV. The result have following by: 1)For the aged, the summer recommend temperature, $26^{\circ}C$, is appropriate within first 30 ~ 40 minutes, but it should be increasing the temperature after that time. 2) By considering PMV status and thermal feeling of the aged, they are prefer to higher temperature than normal setting of air-condition system. 3) In the condition of the summer recommend temperature, $26^{\circ}C$, they had answered in neutral or comfort with the comfort sensation vote. However, we had figure out that they had stress in a lower temperature by analyzing the result of HRV.

기후변화 및 폭염대응 증발냉각시스템 적용에 따른 내·외부 열환경 변화 연구 (Thermal Environment Transition of Response Climate Change and Heat Wave Application Evaporative Cooling System)

  • 김정호;김학기;윤용한;권기욱
    • 한국환경과학회지
    • /
    • 제25권9호
    • /
    • pp.1269-1281
    • /
    • 2016
  • This study evaporative cooling system a heat wave climate change and reduction of the inside and outside thermal environment change research. Measurement items included micro meteorological phenomena and measured comfort indices. A micro meteorograph of temperature, relative humidity, surface temperature, and the comfort indices of WBGT, UTCI, and PMV were measured. The difference in inside and outside temperatures were compared for different land types, with the largest difference found in Type A ($4.81^{\circ}C$), followed by Type B ($4.40^{\circ}C$) and Type C ($3.12^{\circ}C$). Relative humidity was about 10.43% higher inside due to water injection by the evaporative cooling system. Surface temperature was inside about $6.60^{\circ}C$ higher than the outside all types. WBGT were Type A ($3.50^{\circ}C$) > Type B ($2.71^{\circ}C$) > Type C ($1.88^{\circ}C$). UTCI was low heat stress inside than outside all types. PMV was analysed Type C for inside predicted percentage of dissatisfied 75%, other types was percentage of dissatisfied 100% by inside and outside. Correlation analysis between land cover type and temperature, surface temperature, pmv, utci. T-test analysed inside and outside temperature difference was significant in all types of land.

시간 변화에 따른 여름철 산림환경의 생리ᐧ심리적 안정 효과 (Temporal Changes in the Physiological and Psychological Relaxation Effects of a Forest Environment during the Summer)

  • 송인준;김주현;김초윤;정다워;이윤정;박범진;송초롱
    • 한국산림과학회지
    • /
    • 제113권1호
    • /
    • pp.107-117
    • /
    • 2024
  • 본 연구는 시간에 따른 산림환경의 물리환경요소 변화와 이에 따른 온열환경 쾌적성, 인체의 생리·심리적 반응의 차이를 종합적으로 규명하기 위하여 수행되었다. 9시부터 18시까지 산림환경의 물리환경요소(공기온도, 평균복사온도, 풍속, 상대습도)와 예상평균한서감지수(PMV), 예상불만족률(PPD)를 연속 측정하고, 1시간 간격으로 남자 대학생 30명(평균 연령: 21.7±1.9세)이 눈을 감고 5분 동안 안정을 취할 때의 생리·심리적 반응(심박변이도, 심박수, 구강체온, 혈압, 맥박수, 주관적 온열감과 쾌적감 및 인상)을 조사하였다. 더불어 물리환경요소와 생리적 반응 사이의 상관관계를 조사하였다. 그 결과, ① 공기온도, 평균복사온도, 풍속, 상대습도 모두 시간에 따라 유의하게 변화하였다. ② PMV와 PPD도 시간에 따라 유의하게 변화하였다. 주관적 온열감은 PMV와 일치하였으나, 주관적 쾌적감은 PPD와 일치하지 않았다. ③ 생리적 반응 중 ln(HF), ln(LF/HF), 심박수, 이완기혈압이 시간에 따라 유의하게 변화하였다. 공기온도가 가장 높았던 14~16시에 ln(HF)는 가장 낮았고, ln(LF/HF)는 가장 높았다. ④ 공기온도, 평균복사온도, 풍속은 ln(HF)와 음의 상관관계, ln(LF/HF)와 양의 상관관계를 나타내었다. 이를 통해 산림환경을 이용하는 시간대에 따라 이용객의 쾌적감과 생리·심리적 안정 효과가 달라질 수 있으며, 시간에 따른 산림환경의 물리환경요소 변화가 이러한 차이에 영향을 미친다는 사실이 밝혀졌다.

보건의료시설의 실내 예상 평균 온열감(PMV), 이산화탄소 농도, 소음도, 조도의 통합실내쾌적도(IEQh)를 통한 연간 실내 쾌적도 평가 (Evaluation of Annual Indoor Environment Quality in Hospitals using Various Comfort-related Factors)

  • 이보람;이대엽;반현경;이세원;김규상;이기영
    • 한국환경보건학회지
    • /
    • 제43권3호
    • /
    • pp.214-222
    • /
    • 2017
  • Objectives: A hospital is a complex building that serves many different purposes. The indoor environment in a hospital plays a major role in patient well-being and the work efficiency of the hospital staff. This study was conducted to evaluate overall comfort in two major hospitals over the course of one year. Methods: Various indoor environmental conditions were measured in two general hospitals for one year (April 2014 to April 2015). Monitoring alternated between the hospitals at one month per respective monitoring session. The indoor air temperature, relative humidity (RH), mean radiant temperature and air velocity were measured in order to calculate the predicted mean vote (PMV). Carbon dioxide concentration, noise level and illumination level were concurrently measured and applied to the overall IEQ acceptance model for the hospitals (IEQh). Results: The IEQh at the two general hospitals was different at five spaces within a building. The IEQh for summer and winter were significantly different. Real-time IEQh demonstrated that indoor comfort was affected by the hospital's operating hours due to operation of the HVAC system. The percentage of indoor comfort in the hospitals was higher using PMV than IEQh. Conclusion: IEQh in the hospitals was different at locations with different purposes. Indoor comfort assessment using IEQh was stricter than with PMV. Additional research is needed in order to optimize the IEQh model.