The Chilled Supply Water Setting considering both Comfort Index of New Effective Temperature and Energy Performance in Office Building

Title & Authors
The Chilled Supply Water Setting considering both Comfort Index of New Effective Temperature and Energy Performance in Office Building
Seo, Dae-Woong; Kwak, Ro-Yeul; Choi, Sun-Kyu;

Abstract
Increasing chilled water supply temperature is recommended to save the energy as a control tool in buildings using BEMS. Though indoor humidity affects occupants' thermal sensation, health, and business efficiency work efficiency in office buildings, office building operate cooling system focusing on indoor temperature. In this study, the goal of the research is to set supply air temperature using new effective temperature comfort index which is considering both temperature and humidity and to compute chilled water supply temperature using the set supply air temperature. Therefore, to prevent indoor uncomfort of misoperation and to reach energy saving, unskilled building operator can easily set chilled water supply temperature up by suggested guide line that can set chilled water supply temperature based on mixed wet bulb temperature, chilled water flow and supply air temperature. We researched comfort distribution of buildings, and readjusted comfort range of new effective temperature limit based on report of complaint. Building of subject of study exceeded comfort range $\small{26ET^*}$ suggested by ASHRAE, but we arranged comfort range limit to $\small{26.6ET^*}$ since no complaint was reported. We proposed setting guide line to have highest chilled water supply temperature based on analysis of mixed wet bulb temperature that can consider both outdoor air and indoor air at the same time, a set supply air temperature by operator, and data of cool water flow rate passing through cooling coil to find the most appropriate chilled water supply temperature for set supply air temperature.
Keywords
Centrifugal Chiller;Chilled Water Supply Temperature;New Effective Temperature;Comfort Index;Energy Saving;
Language
Korean
Cited by
References
1.
ASHRAE Standard 55(2013). Thermal Environmental Conditions for Human Occupancy, New York, ASHRAER.

2.
Chang, Y. C., & Chen, W. H. (2009). Optimal chilled water temperature calculation of multiple chiller systems using Hopfield neural network for saving energy. Energy 34, 448-456.

3.
Lim, M. T. (2011). Architectural environmental planning. 3rd ed, Bo-Moon-Dang, 159

4.
Romero, J. A., Navarro-Esbri, J., & Belman-Flores, J. M. (2011). A simplified black-box model oriented to chilled water temperature control in a variable speed vapour compression system. Applied Thermal Engineering 31, 329-335.

5.
Wan, J. W. (2009). A new method of determination of indoor temperature and relative humidity with consideration of human thermal comfort. Building and Environment 44, 411-417.