[논문]A Comparison between In-situ PET and ENVI-met PET for Evaluating Outdoor Thermal Comfort

Jeong, Da-in; Park, Kyung-hun; Song, Bong-guen

doi:10.12813/kieae.2016.16.1.011

A Comparison between In-situ PET and ENVI-met PET for Evaluating Outdoor Thermal Comfort 원문보기

KIEAE journal = 한국생태환경건축학회논문집, v.16 no.1, 2016년, pp.11 - 19

Jeong, Da-in (Dept. of Environmental Engineering, Changwon National Univ.) , Park, Kyung-hun (Dept. of Environmental Engineering, Changwon National Univ.) , Song, Bong-guen (Changwon Research Institute)

Abstract ▼ AI-Helper

Purpose: PMV, PET, and similar thermal comfort indices and microclimate modeling have recently become actively used to evaluate thermal comfort. This study will look at pedestrian roads with diverse spatial characteristics on university campus using the ENVI-met model as the base for onsite measurement. Method: The PET was used as the thermal comfort index. The first microclimate measures were collected on September 20, 2014, and the second microclimate measures were collected on June 1, 2015. The ENVI-met model was used at the same time. Result: As a results, Onsite measurement results differed depending on the PET spatial characteristics. The location associated with the most discomfort had a PET of $47.8^{\circ}C$. The spatial characteristics of this place included a with no shade. The most comfortable location had shade, and the PET was $24.6^{\circ}C$. When the ENVI-met model and onsite measurements were compared, similar patterns were found, but with a few differences at specific points; this was due to the limitation of using input materials such as trees, buildings, and covering materials with the ENVI-met model. This factor must be thoroughly considered when analyzing modeling results.

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제안 방법

This study performed the 1st and 2nd measurements on Sep 20, 2014 and June 1, 2015, respectively for walk space in a university campus , calculated in-situ and ENVI-met modeling PETs and compared them in order to verify the accuracy of ENVI-met micro-climate model for evaluation of thermal comfort for spatial characteristics.

데이터처리

7clo, which indicates wearing light tropical clothes by considering the weather at the time of measurement. Spot-specific PET values calculated on the basis of in-situ measurements and micro-climate elements from ENVI-met modeling were compared by using RMSE (Root Mean Square Error).

성능/효과

As above, temperature, humidity, wind speed and mean radiant temperature obtained by in-situ measurement and ENVI-met modeling are influenced by spatial characteristics. According to the results of application of ENVI-met modeling to the site for study, mean radiant temperatures tend to be predicted to be higher than in-situ measurements and it is judged to result from the fact that the scope of shade, degree of blocking sunlight, etc. according to the height of buildings and leaf area index, tree crown and height of trees are not reflected in ENVI-met modeling sufficiently. It is also judged that modeling results are influenced by the fact that physical current information such as the paving material, trees and building of the site is not reflected accurately due to the limitation in spatial resolution of input data.
The spatial characteristics of the spot is that paving material is soil and there is shade caused by a building. According to the results of measurement at 03:00 PM, 27.5℃ of temperature, 32.3% of relative humidity and 1.7m/s of wind speed were found on average and Spot 3 has the highest PET of 35.0℃. It is judged to result from the fact that Spot 3 has no shade and open spatial characteristics, causing the effect of solar radiation energy.
Spots with large difference had mean radiant temperature predicted to be very high and it resulted in high PET. First, it is judged that large differences result from the fact that ENVI-met modeling had a tendency of excessive prediction in space which had artificial paving such as asphalt and concrete as the paving material and ENVI-met showed low accuracy in the scope of shade made by buildings and trees when the measurement spot is influenced by shade. Second, humidity among micro-climate elements showed overall difference between actual measurements and modeling values and wind speed showed large difference as it does not show constant pattern due to the extensive impact of local wind, regional wind, etc.
First, it is judged that large differences result from the fact that ENVI-met modeling had a tendency of excessive prediction in space which had artificial paving such as asphalt and concrete as the paving material and ENVI-met showed low accuracy in the scope of shade made by buildings and trees when the measurement spot is influenced by shade. Second, humidity among micro-climate elements showed overall difference between actual measurements and modeling values and wind speed showed large difference as it does not show constant pattern due to the extensive impact of local wind, regional wind, etc. Therefore, it is judged that in these cases, impact of surrounding areas shall be considered by using weather model of local scale for the target site instead of long-term weather observation before using micro-climate modeling such as ENVI-met.

후속연구

As micro-climate modeling has a limit, however, in reproducing actual space or reflecting a variety of variables which occur in reality^[8], accuracy must be verified by using in-situ measurement to ensure the reliability of results from micro-climate modeling analysis. Therefore, this study intends to compare the PET indexes of in-situ measurement and ENVI-met which is widely used for evaluation of thermal comfort in order to identify the accuracy of micro-climate modeling in regard to thermal comfort.

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