Zhang's thermal comfort model [Zhang H. Human thermal sensation and comfort in transient and non-uniform thermal environments, Ph.D. Thesis, UC Berkeley; 2003. 415 pp.] predicts that the local comfort of feet, hands, and face predominates in determining a person's overall comfort in warm and cool conditions. We took advantage of this in designing a task–ambient conditioning (TAC) system that heats only the feet and hands, and cools only the hands and face, to provide comfort in a wide range of ambient environments. Per workstation, the TAC system uses less than 41 W for cooling and 59 W for heating. We tested the TAC system on 18 subjects in our environmental chamber, at temperatures representing a wide range of practical winter and summer conditions (18–30 °C). A total of 90 tests were done. We measured subjects' skin and core temperatures, obtained their subjective responses about thermal comfort, perceived air quality, and air movement preference. Buy PowerTask 610007 12V 6/2 Amp Dual Rate Automatic Battery Charger: Battery Chargers - Amazon.com ✓ FREE DELIVERY possible on eligible purchases. The subjects performed three different types of tasks to evaluate their productivity during the testing. The TAC system maintains good comfort levels across the entire temperature range tested. TAC did not significantly affect the task performance of the occupants compared to a neutral ambient condition. Whenever air motion was provided, perceived air quality was significantly improved, even if the air movement was re-circulated room air. In our tests, subjects found thermal environments acceptable even if they were judged slightly uncomfortable (−0.5). By reducing the amount of control normally needed in the overall building, the TAC system saves energy. Simulated annual heating and cooling energy savings with the TAC system are as much as 40%. • Previous article in issue • Next article in issue. Management of PC power state which can shut down and restart systems on a schedule: PowerTask is a power management tool that allows shutdown and wake up a group of remote computers at schedule time. The program remotely turn on computer using Wake on Lan function, and remote shutdown by Windows API and WMI. These means not require install any client side utility. PowerTask is licensed as Shareware for the Windows operating system / platform from and can be used as a free trial until the trial period ends (after 30 days). The PowerTask 3.1 demo is available to all software users as a free download with potential restrictions and is not necessarily the download of the full version. This rescheduler starter software is filed under: • PowerTask Download Compatibility with this rescheduler starter software may vary, but will generally run fine under Microsoft Windows 10, 8, 8.1, 7, Vista and XP on either a 32-bit or 64-bit setup. A separate x64 version may be available from Simplyware. Page maintained by Fernando Ortega.
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