جستجو در تالارهای گفتگو

THERM 6.3Research Version December 2010 The Research Versions for WINDOW 6.3 and THERM 6.3 have been developed to modeling complex glazing systems, in particular venetian blinds. The algorithms used in the Research Versions of WINDOW6 and THERM6 to determine the properties of windows with shading layers are relatively new and should be considered as informative but not definitive. As such, for windows with shading layers, the results are intended for research purposes only. Pending further validation efforts, results for windows with shading layers should not be used for National Fenestration Rating Council (NFRC) certified calculations or design decisions in real buildings. All calculations for products without shading layers are identical to those from WINDOW 5.2 and THERM 5.2. Stable version THERM 6.3.19 (12/18/2010)

مقدمه آناليز حرارتي روشي براي بدست آوردن اطلاعات كيفي و كمّي در مورد تأثير حرارت بر انواع مختلف مواد، از جمله: تركيبات شيميايي، پليمرها (لاستيك، پلاستيك و كامپوزيت)، سراميك‏ها، آلياژها، مواد معدني، غذا و دارو است. است. طبق نظرية اتحادية بين‏المللي، آناليز حرارتي، گروهي از روش‏هاي تجزيه و تحليل حرارتي است كه در آن خواص فيزيكي يك ماده و يا محصولات واكنش آن بعنوان تابعي از دما در شرايطي كه ماده تحت يك برنامة دمايي كنترل شده قرار دارد، اندازه‏گيري مي‏شود و عبارتند از: - Differential Thermal Analysis (DTA) تجزيه گرمايي تفاضلي - Differential scanning calorimetery (DSC) گرماسنجي پويشي تفاضلي - Thermogravimetric Analysis (TGA) گرماوزن‏سنجي - Thermomechanical Analysis (TMA) تجزيه گرما مكانيكي - Evolved Gas Analysis (EGA) تجزيه آزادسازي گاز (جهت تعيين ماهيت يا مقدار محصولات فرار) - Dynamic Mechanical Thermal Analysis (DMTA) تجزيه گرمايي ديناميك-مكانيكي اين روش‏هاي گرمايي آناليز، تكنيك‏هايي هستند كه تغيير برخي از خواص مواد را ضمن اعمال يك برنامه دمايي مشخص بررسي مي‏كنند. اين برنامة دمايي مي‏تواند، ديناميك باشد كه در آن نمونه با سرعت ثابتي در محدودة دمايي مورد نياز، گرم يا سرد ‏شود، همچنين مي‏تواند شامل ثبات دما در مقداري از پيش تعيين شده باشد و تغييراتي را كه در محدودة زماني مشخص اتفاق مي‏افتد، بررسي كند. خواصي كه از طريق روش‏هاي گرمايي اندازه‏گيري مي‏شوند، عبارتنداز: - تغييرات ساختار شامل انتقال شيشه‏اي، پديده ذوب، جوش. تصعيد انتقالات فاز جامد - خواص مكانيكي شامل انبساط و انقباض و مدول - ثابت‏هاي گرمايي شامل CP و نقاط ذوب - فعاليت‏هاي شيميايي شامل واكنش‏هاي جامد- جامد-گاز، بي‏آب شدن و پخت، پايداري حرارتي مواد در اتمسفرهاي مختلف گازي و واكنش‏هاي تجزية گرمايي

Introduction to Thermal Testing (AKA Thermal Inspection, Thermography, Thermal Imaging, Thermal Wave Imaging and Infrared Testing) Thermal NDT methods involve the measurement or mapping of surface temperatures as heat flows to, from and/or through an object. The simplest thermal measurements involve making point measurements with a thermocouple. This type of measurement might be useful in locating hot spots, such as a bearing that is wearing out and starting to heat up due to an increase in friction. In its more advanced form, the use of thermal imaging systems allow thermal information to be very rapidly collected over a wide area and in a non-contact mode. Thermal imaging systems are instruments that create pictures of heat flow rather than of light. Thermal imaging is a fast, cost effective way to perform detailed thermal analysis. The image above is a heat map of the space shuttle as it lands. Thermal measurement methods have a wide range of uses. They are used by the police and military for night vision, surveillance, and navigation aid; by firemen and emergency rescue personnel for fire assessment, and for search and rescue; by the medical profession as a diagnostic tool; and by industry for energy audits, preventative maintenance, processes control and nondestructive testing. The basic premise of thermographic NDT is that the flow of heat from the surface of a solid is affected by internal flaws such as disbonds, voids or inclusions. The use of thermal imaging systems for industrial NDT applications will be the focus of this material. .