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... Thermal conductivity does not deteriorate with aging Disadvantages Fragile as glass Thermal shock at temp. gradient >300°F (>150°C) Abrades in vibrating service, fragile before application (Not from API RP 583) Low permeability and absorption make cellular glass an ideal system for cold and cryogeni ...
... Thermal conductivity does not deteriorate with aging Disadvantages Fragile as glass Thermal shock at temp. gradient >300°F (>150°C) Abrades in vibrating service, fragile before application (Not from API RP 583) Low permeability and absorption make cellular glass an ideal system for cold and cryogeni ...
Human-thermal
... • Person-related. Deep body temperature in humans is always close to 37 ºC independent of environmental temperature, as first measured in the 1660s by Boyle. It may depart a few degrees under unhealthy circumstances, particularly above that value, as with fever, or during heavy prolonged physical ex ...
... • Person-related. Deep body temperature in humans is always close to 37 ºC independent of environmental temperature, as first measured in the 1660s by Boyle. It may depart a few degrees under unhealthy circumstances, particularly above that value, as with fever, or during heavy prolonged physical ex ...
Optimal heating and cooling strategies for heat exchanger design
... illustrating the optimal heating/cooling strategy that minimizes entropy production. The process is constrained to proceed in a fixed, given time (as is common in industry where fixed production rates are a constraint). The problem selected is illustrative in that it has a simple closedform analytic ...
... illustrating the optimal heating/cooling strategy that minimizes entropy production. The process is constrained to proceed in a fixed, given time (as is common in industry where fixed production rates are a constraint). The problem selected is illustrative in that it has a simple closedform analytic ...
Near-wall Electrically Induced Vortices for Quasi
... electric current injection from an electrode offset from the duct centreline towards the hot wall. In this configuration, the fluid flows in a duct with three electrically insulated walls where allowing electricity conducting from only one side wall perpendicular to the magnetic field. The bottom wa ...
... electric current injection from an electrode offset from the duct centreline towards the hot wall. In this configuration, the fluid flows in a duct with three electrically insulated walls where allowing electricity conducting from only one side wall perpendicular to the magnetic field. The bottom wa ...
Using the “Clicker” - Boston University: Physics
... A heat engine A heat engine is a device that uses heat to do work. A gasoline-powered car engine is a good example. To be useful, the engine must go through cycles, with work being done every cycle. Two temperatures are required. The higher temperature causes the system to expand, doing work, and t ...
... A heat engine A heat engine is a device that uses heat to do work. A gasoline-powered car engine is a good example. To be useful, the engine must go through cycles, with work being done every cycle. Two temperatures are required. The higher temperature causes the system to expand, doing work, and t ...
Dynamic insulation
Dynamic insulation is a form of insulation where cool outside air flowing through the thermal insulation in the envelope of a building will pick up heat from the insulation fibres. Buildings can be designed to exploit this to reduce the transmission heat loss (U-value) and to provide pre-warmed, draft free air to interior spaces. This is known as dynamic insulation since the U-value is no longer constant for a given wall or roof construction but varies with the speed of the air flowing through the insulation (climate adaptive building shell). Dynamic insulation is different from breathing walls. The positive aspects of dynamic insulation need to be weighed against the more conventional approach to building design which is to create an airtight envelope and provide appropriate ventilation using either natural ventilation or mechanical ventilation with heat recovery. The air-tight approach to building envelope design, unlike dynamic insulation, results in a building envelope that provides a consistent performance in terms of heat loss and risk of interstitial condensation that is independent of wind speed and direction. Under certain wind conditions a dynamically insulated building can have a higher heat transmission loss than an air-tight building with the same thickness of insulation.