Study on the Concentration Modelling of Formaldehyde and TVOC Emission from Mul-ti-layer Wooden Materials-A Case Study on Interior Design of Residential Buildings

Abstract

Interior design in Taiwan tend to apply considerable carpenter works for massive needs of storage furniture posing a risk of air pollution inevitably There is not much studies on wooden storage furniture in domestic literatures In addition Healthy Building Material examination of Green Building Material Labels launched by Architecture and Building Research Institute Ministry of the Interior regulates the emission examination of each ma-terial specifically but omitted that in practice those interior carpenter works are made of multi-layer materials Eventually the actual emission of a decorated space may not reveal with the examination right after the work In this study multi-layer wood materials were investigated for the establishment of concentration modelling which enables designers to estimate the HCHO and TVOC concentration before the decoration works through in-creasing decreasing or alternating the material usage rate factor Therefore the emission of formaldehyde (HCHO) and TVOC from multi-layer wooden material in residentials is the issue of the study The distinction of emission phase between single and multi-layer material was discussed Later the contribution of emission from each material composing a multi-layer material is analyzed while the data collected with the direct-reading and air sampling detectors were compared In first part of the research the multi-layer composition was investigated with question-naire and afterwards a sample was made referring to the investigation result for the ex-periment in a Small-Scale Chamber And in next part measurements were operated in new-ly decorated residentials The properties of decoration material load factor were collected and analyzed with the sampled concentration data of formaldehyde and TVOC by means of multiple regression analysis in the expectation to observe the relationship between mul-ti-layer materials and IAQ With the questionnaire four kinds of small samples of materials in common use were sum-marized including veneer multi-layer materials melamine multi-layer materials paint mul-ti-layer materials and lumber core board Through Small-Scale Chamber Method the HCHO emission rate of four samples at the 48th hr are less than 0 05 mg/m2 hr which achieves Healthy Building Material E3 level As for the emission velocity Lumber Core Board is the fastest then Veneer Melamine and Paint multi-layer materials showing the difference characteristics of emission velocity Also the average concentration of HCHO and TVOC when the windows are not open are higher than open as the HCHO being 0 17ppm and 0 04ppm and TVOC being 1ppm and 0 36 ppm With t-test of Mann-Whitney U HCHO concentration data obtained from HPLC analysis and di-rect-reading detector has significant differences Furthermore the former is larger than the later data indicating that the HCHO concentration may be underestimated with di-rect-reading detectors The relationship between HCHO and TVOC concentration contribution and the decoration material load factor were analyzed with multiple regression analysis The contribution of compound existing in each material demonstrates different influence when discussed in different modelling For example wooden pavement Melamine multi-layer materials and cement paint shows significant relationship with the high concentration of Benzene when windows open But in other modeling wooden pavement shows significant relationship and Veneer multi-layer materials takes the second place Finally improvement strategy is stud-ied In case K23L the predicted HCHO and TVOC concentration is 0 301ppm and 2 06ppm respectively When analyzing the object of contribution of wooden pavement was removed to see if the emission meets the regulation but in vain But when applying alterna-tive materials the HCHO and TVOC concentration were lowered Therefore the concen-tration modelling analysis for variable decoration load factor enables previous estimation of HCHO and TVOC concentration level and adjust the composition or material decision to meet IAQ standards according to the analysis results afterwards

Date of Award	2019
Original language	English
Supervisor	Yaw-Shyan Tsay (Supervisor)