Interaction of dynamic indoor environment with moving person and performance of ceiling mounted personalized ventilation system
Ceiling mounted personalized ventilation (PV) aims to provide clean outdoor air into human breathing zone without affecting indoor aesthetics in energy-efficient manner. In steady state, its performance depends much on the ceiling mounted air terminal device (ATD) because supply air momentum, other than human body thermal plume and ambient air flow, is the major driving force in the micro-environment of occupied zone. A typical office workplace consisting of ceiling mounted PV ATD and ambient air supply diffusers was simulated. One person was seated and another moving person was simulated by dynamic meshes in computational...
Source: Indoor and Built Environment - October 6, 2014 Category: Occupational Health Authors: Yang, B., Sekhar, C. Tags: Original Papers Source Type: research
Solar thermal systems for large high rise buildings in Malaysia
(Source: Indoor and Built Environment)
Source: Indoor and Built Environment - October 6, 2014 Category: Occupational Health Authors: Yau, Y. H., Chan, W. C., Yu, C. W. F. Tags: Editorial Source Type: research
Optimized control algorithm for automated Venetian blind system considering solar profile variation in buildings
The objective of this study is to develop an optimized control algorithm for automated venetian blind which would reduce the negative effects of incoming daylight on visual comfort of occupants, and to minimize psychological anxieties caused by frequent motions of the blind, by maximizing the positive effects of incoming daylight and solar irradiation, by opening/closing of the blind. Through implementation of the proposed methods and algorithms, the direct glare on work-planes could be prevented at all time, and also incoming daylight and solar irradiation could be increased. (Source: Indoor and Built Environment)
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Seong, Y.-B., Yeo, M.-S., Kim, K.-W. Tags: Original Papers Source Type: research
Fine and coarse particle mass concentrations and emission rates in the workplace of a detergent industry
Aerosol mass concentration (PM10, PM2.5) measurements were conducted in the workplace of a detergent industry for two time periods during July 2005 and January 2006, using two portable real-time photometric monitors. The results showed increased mass concentrations both for PM10 and PM2.5 particles during the detergent production periods. The differences in the concentrations of the PM10 and PM2.5 particles were used to determine the corresponding mass concentrations of coarse particles and these values were then used to evaluate the diurnal variation both for fine and coarse particles. An indoor mass balance model was app...
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Glytsos, T., Ondraček, J., Džumbova, L., Eleftheriadis, K., Lazaridis, M. Tags: Original Papers Source Type: research
A multi-dimensional scale for measuring residential satisfaction (rs) in mass housing projects
This study examines the residential satisfaction (RS) in state mass housing projects sponsored and developed by the Turkish government. A total of 80 residents were surveyed. Participants were the householders of 1-bedroom 1-bathroom; 2-bedroom 1-bathroom and 3-bedroom 1-bathroom apartments in a settlement designed and constructed by the Turkish Housing Development Administration for the employees of the Turkish National Police. Since similar schemes are still being constructed in large quantities all over the country, the results of this study could provide guidance and affect quality control for future developments. The ...
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Dinc, P., Ozbilen, E., Bilir, M. B. Tags: Original Papers Source Type: research
A numerical analysis of airflows caused by train-motion and performance evaluation of a subway ventilation system
A numerical analysis of airflows caused by train-motion in one-shaft subway system and two-shaft subway system was carried out using computational fluid dynamics (CFD) method. The dynamic mesh method was used to model the moving boundaries of the train. The geometry model and train-operation schedule employed were exactly the same as the real situation. The CFD model was validated against field measurement data. The performance of natural ventilation system impacted by the location and number of the vent shafts was evaluated by two indexes, i.e. net exhaust air volume, Ne, and net suction air volume, Ns. The result shows t...
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Yan, W., Naiping, G., Lihui, W., Xiping, W. Tags: Original Papers Source Type: research
Ideal thermal physical properties of building wall in an active room
Optimizing the thermal physical properties of building envelope can decrease the energy consumption in active rooms. In this paper, a method of determining the ideal thermal mass characteristics of an active room wall has been developed, which can derive the optimal thermal physical properties of building walls by minimizing additional energy consumption. For demonstrating purpose, some illustrating examples are presented. The results show that: (a) the ideal specific heat distribution with temperature of the thermal mass for an active room approaches the function, which has the characteristic similar to that of phase cha...
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Wang, X., Cheng, R., Zeng, R., Zhang, Y. Tags: Original Papers Source Type: research
Optimising the supply parameters oriented to multiple individual requirements in one common space
In many circumstances, different air parameters in multiple locations are required in one common space, such as the personalised temperature requirements of occupants and the different cleanliness requirements of technical processes in industry, and therefore it is important to simultaneously satisfy different requirements by ventilation. In this paper, an optimisation model to determine the supply parameters oriented to different requirements is established. Because the proposed model takes the quantitative relationship between an air parameter in an arbitrary location and various boundary conditions into account, once th...
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Shao, X., Li, X., Ma, X., Chen, C. Tags: Original Papers Source Type: research
Radon concentrations in air and water in the thermal spas of Ischia Island
The aim of the paper is to give information about radon concentration in air and in water of 16 thermal spas of the Isle Ischia to assess the corresponding mean effective dose for workers. Measurements of air radon concentration were carried out by means of Electret Passive Environmental Radon Monitor (E-PERM) devices in long-term configuration, while radon activity concentration in water was measured using the same detectors in short-term configuration. In each plant, several kinds of rooms of different uses (office, muddy room, massage room, relax room, aerosol, mud pit and medical treatment room) were selected. Results ...
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Pugliese, M., Quarto, M., Roca, V. Tags: Original Papers Source Type: research
Condensation risk of DCDV system for hot and humid Hong Kong
In this study, the condensation risk of the use of dry cooling air-handler and dedicated ventilation (DCDV) system in subtropical climates was examined by analysing its application in a typical office building in Hong Kong using actual equipment performance data and realistic system characteristics. Through hour-by-hour simulations it was found that the annualised cumulative frequency of occurrence of condensation (ConHR) for normal operation of the office building was acceptable. However, departures of the in-use condition from design values are inevitable. Additional parametric studies were therefore performed to evaluat...
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Jia, J., Lee, W. L. Tags: Original Papers Source Type: research
Correlating the symptoms of sick-building syndrome to indoor VOCs concentration levels and odour
In this study, the correlation between the sum of VOCs(C2-C16) including aldehydes (VOCs) and SBS symptoms were examined by statistics. The odour was quantified using the odour threshold ratio (OTR) and the correlation between the total odour threshold ratio (TOTR: sum of the OTR) and SBS symptoms was investigated. These correlations were examined separately for sensitive and insensitive groups. TOTR and the concentration level of VOCs were correlated with SBS symptoms among sensitive people. The findings indicate that TOTR, in addition to VOCs, could be used as a new risk indicator for human health regarding indoor air qu...
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Nakaoka, H., Todaka, E., Seto, H., Saito, I., Hanazato, M., Watanabe, M., Mori, C. Tags: Original Papers Source Type: research
Integrated building energy computational fluid dynamics simulation for estimating the energy-saving effect of energy recovery ventilator with CO2 demand-controlled ventilation system in office space
As ventilation is one of the critical heat loads in an office space, the ventilation rate might be optimized to develop sustainable, low-energy buildings and a healthy indoor environment. To create comprehensive and optimized indoor environmental designs, a building energy simulation (BES)-computational fluid dynamics (CFD)-integrated simulation is used to provide accurate and informative prediction of the thermal and air-quality performance in buildings, especially in the design stage. With the aim of developing an optimization procedure for the ventilation rate, this paper presents simulations that integrates BES and CFD...
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Fan, Y., Ito, K. Tags: Original Papers Source Type: research
Measurement of radon concentration and exhalation rate in some mud houses of district Lahore, Pakistan
Some low-income people of Pakistan live in traditional windowless one- to two-room houses made of mud. The data on radon concentration in such houses of Pakistan was scarce in the literature. Therefore, 60 mud houses in the vicinity of the city of Lahore (the capital of the Punjab province of Pakistan) were selected for survey of radon in these houses. The passive integrating technique with CN-85 track detectors was employed for the measurement of radon. Indoor and outdoor radon concentrations were determined to be 114.88 ± 66.79 (18.37 – 269.58) and 10.78 ± 2.70 (8.08 – 13.57) Bq m–3, respe...
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Mahmood, A., Tufail, M., Iqbal, M. A. Tags: Original Papers Source Type: research
Improve our understanding of semivolatile organic compounds in buildings
(Source: Indoor and Built Environment)
Source: Indoor and Built Environment - September 11, 2014 Category: Occupational Health Authors: Guo, Z. Tags: Editorial Source Type: research
Analyzing green building rating tools for healthcare buildings from the building user's perspective
The principles of sustainability in the healthcare building sector are perceived differently by different healthcare building user groups. Based on a cross-sectional survey of hospital patients, staff, visitors and members of the public, this study found that issues relating to transport and accessibility were perceived as "more significant" by respondents compared to how they are currently weighted in the Australian Green Star–Healthcare building rating tool. Environmental impacts relating to emissions to air and water were also identified as "more significant" by the healthcare building users than their Green Star ...
Source: Indoor and Built Environment - September 3, 2014 Category: Occupational Health Authors: Kim, S., Osmond, P. Tags: Original Papers Source Type: research
