Recitation 3.2 Temperature/Heat
... 1. Two objects are made of the same material, but have different masses and temperatures. If the objects are brought into thermal contact, which one will have the greater temperature change? a. the one with the higher initial temperature b. the one with the lower initial temperature c. the one with ...
... 1. Two objects are made of the same material, but have different masses and temperatures. If the objects are brought into thermal contact, which one will have the greater temperature change? a. the one with the higher initial temperature b. the one with the lower initial temperature c. the one with ...
8.3 Temperature and Heat Heat Transfer Heat Flow
... is heated to a temperature of 65oF when the outside temperature is 40oF. How much does it cost per month to heat the shed with gas at the price of $1.20 per therm (1 therm=105BTU) ...
... is heated to a temperature of 65oF when the outside temperature is 40oF. How much does it cost per month to heat the shed with gas at the price of $1.20 per therm (1 therm=105BTU) ...
GAIN AN OVERVIEW OF THE EXPERIMENT
... rates of African and European honeybees, Jon Harrison (Arizona State University) and H. Glenn Hall (University of Florida) discovered that relatively small increases in air temperature were correlated with substantial decreases in flight metabolic rate and wingbeat frequency. This result suggests th ...
... rates of African and European honeybees, Jon Harrison (Arizona State University) and H. Glenn Hall (University of Florida) discovered that relatively small increases in air temperature were correlated with substantial decreases in flight metabolic rate and wingbeat frequency. This result suggests th ...
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.