The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Alessandro Piccolo - One of the best experts on this subject based on the ideXlab platform.
-
thermal performance of an electrochromic smart window Tested in an Environmental Test cell
Energy and Buildings, 2010Co-Authors: Alessandro PiccoloAbstract:Abstract This paper describes the results of experimental Tests and computer simulation modelling aimed at evaluating the performance of an electrochromic (EC) window with respect to solar control in buildings. The research is carried out by a Test-cell equipped with a small area EC double glazing unit (EC-DGU) where one pane consists of an EC device and the other of a clear glass. The performance of the device on global light transmittance control, internal temperature control and solar heat gain control, is investigated in summer-time under real sky conditions as a function of time, Test-cell orientation and switching strategies (static and dynamic). Both experiments and numerical analysis show that the decrease of the heat load affecting the Test-cell, normalized respect to a clear float glass, is maximum when the EC-DGU is set to its lowest transmitting state and amounts to about 50% for west orientation and about 60% for south orientation. In this latter, thermal load reduction registered when the EC DGU is driven in the dynamic mode (31%) is similar to that of a reflective low-e glazing.
-
Thermal performance of an electrochromic smart window Tested in an Environmental Test cell
Energy and Buildings, 2010Co-Authors: Alessandro PiccoloAbstract:This paper describes the results of experimental Tests and computer simulation modelling aimed at evaluating the performance of an electrochromic (EC) window with respect to solar control in buildings. The research is carried out by a Test-cell equipped with a small area EC double glazing unit (EC-DGU) where one pane consists of an EC device and the other of a clear glass. The performance of the device on global light transmittance control, internal temperature control and solar heat gain control, is investigated in summer-time under real sky conditions as a function of time, Test-cell orientation and switching strategies (static and dynamic). Both experiments and numerical analysis show that the decrease of the heat load affecting the Test-cell, normalized respect to a clear float glass, is maximum when the EC-DGU is set to its lowest transmitting state and amounts to about 50% for west orientation and about 60% for south orientation. In this latter, thermal load reduction registered when the EC DGU is driven in the dynamic mode (31%) is similar to that of a reflective low-e glazing. © 2010 Elsevier B.V.
Peter Strachan - One of the best experts on this subject based on the ideXlab platform.
-
Simulation-assisted control in building energy management systems
Energy and Buildings, 2002Co-Authors: J.a A. Clarke, J. Cockroft, Nicolas J. Kelly, T. O’brien, S. Conner, J W Hand, T O'brien, R. Moore, Peter StrachanAbstract:Technological advances in real-time data collection, data transfer and ever-increasing computational power are bringing simulation-assisted control and on-line fault detection and diagnosis (FDD) closer to reality than was imagined when building energy management systems (BEMSs) were introduced in the 1970s. This paper describes the development and Testing of a prototype simulation-assisted controller, in which a detailed simulation program is embedded in real-time control decision making. Results from an experiment in a full-scale Environmental Test facility demonstrate the feasibility of predictive control using a physically-based thermal simulation program.
-
Control in Building Energy Management Systems : the Role of Simulation
Seventh International IBPSA Conference, 2001Co-Authors: J.a A. Clarke, O T Brien, Nicolas J. Kelly, J W Hand, R. Moore, Peter StrachanAbstract:Technological advances in real-time data collection, data transfer and ever-increasing computational power are bringing simulation assisted control and on-line fault detection and diagnosis closer to reality than was imagined when Building Energy Manage- ment Systems were introduced in the 1970s. This paper describes the development and Testing of a prototype simulation assisted controller, in which a detailed simulation program is embedded in real- time control decision making. Results from an experiment in a full-scale Environmental Test facility demonstrate the feasibility of predictive control using a physically-based thermal simulation pro- gram.
Tobias Schripp - One of the best experts on this subject based on the ideXlab platform.
-
a permeation controlled formaldehyde reference source for application in Environmental Test chambers
Chemosphere, 2017Co-Authors: Tunga Salthammer, Ruth Giesen, Tobias SchrippAbstract:Abstract In a wide range of indoor air pollutants, formaldehyde is one of the most-used and best-known substances. In order to protect human health, many countries have established threshold values for the release of formaldehyde from miscellaneous products and revise them constantly. Compliance with these regulations is usually assessed by emission Test chamber measurements or derived methods. To control and improve the mechanisms of an emission Test chamber, a reliable reference source with sample mimicking emission properties is required but not available so far. This study describes a permeation-controlled reference source based on the application of paraformaldehyde as formaldehyde releasing polymeric compound. Interactions between the formaldehyde release of the source and the governing chamber parameters temperature, relative humidity and air velocity were investigated in 1 m 3 emission chambers. Depending on the conditions, constant formaldehyde concentrations between approximately 10 ppb and 150 ppb can be adjusted for up to 600 h. A linear correlation between the logarithm of the chamber concentration and the reciprocal temperature was found. The results support the feasibility of the source for validation of emission Test chamber performance.
Zhao Yun-feng - One of the best experts on this subject based on the ideXlab platform.
-
Design of Refrigeration System for Large Environmental Test Chamber
Equipment Environmental Engineering, 2020Co-Authors: Zhao Yun-fengAbstract:Current situation of refrigeration technology of large low temperature Environmental Test chamber was analyzed, and compound refrigeration system based on overlapping refrigeration was put forward.Compressors were selected through cooling load calculation.Precise control of Environmental Test chamber temperature was realized with PID control system based on PLC.
Hiromasa Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
-
a simplified calculation method for estimating heat flux from ceiling radiant panels
Energy and Buildings, 2010Co-Authors: Shigeru Okamoto, Hisataka Kitora, Hiromasa YamaguchiAbstract:In this paper, we have developed a calculation method for estimating heat fluxes from ceiling radiant panels, using pipe density on panels and the temperature difference between the room air and the supply water. We then measured heat fluxes from panels in an Environmental Test room. After comparing the values estimated by our calculation method to the experiment's data, the calculated values closely match the values obtained from experiments, which means that this calculation method is practical in estimating the radiant panel performance in the design phase.
