Paper
... Boundary condition (3) assumes that the ribbon cooling rate is constant. Such assumption can be made because of the very short cooling time. The cooling time of the ribbon can be estimated as 10-3 seconds. For such a short cooling time the cooling rate can be considered as constant with high accurac ...
... Boundary condition (3) assumes that the ribbon cooling rate is constant. Such assumption can be made because of the very short cooling time. The cooling time of the ribbon can be estimated as 10-3 seconds. For such a short cooling time the cooling rate can be considered as constant with high accurac ...
ac nanocalorimeter for measuring heat capacity of biological
... l 0 (⬅ 冑2Λ/ , Λ is the thermal diffusivity of the sample in the longitudinal direction兲, the correction term ␣ will be within 0.001%. Then, the middle part of the sample can be regarded as an infinite tube. This condition determines the low-frequency limit of operating frequency . On the other ha ...
... l 0 (⬅ 冑2Λ/ , Λ is the thermal diffusivity of the sample in the longitudinal direction兲, the correction term ␣ will be within 0.001%. Then, the middle part of the sample can be regarded as an infinite tube. This condition determines the low-frequency limit of operating frequency . On the other ha ...
thermal study of a large ground heat exchanger in clay
... available for damping the temperature response. Kavanaugh and Rafferty (1997) have used a parallelepiped model for calculation of the temperature penalty. This allows one to compare the results of the experimental observation with the model predictions. Further, since this point is at the adiabatic ...
... available for damping the temperature response. Kavanaugh and Rafferty (1997) have used a parallelepiped model for calculation of the temperature penalty. This allows one to compare the results of the experimental observation with the model predictions. Further, since this point is at the adiabatic ...
performance analysis of solar flat plate collector
... iron. Mild steel material have absorbility is about 0.8 with black paint coated. The tube material is galvanized iron which is mild steel with coated with zinc for corrosion resistance. For this selection of material the maximum efficiency obtained was 9.75% at temperature 670 c Keywords: Flat Plate ...
... iron. Mild steel material have absorbility is about 0.8 with black paint coated. The tube material is galvanized iron which is mild steel with coated with zinc for corrosion resistance. For this selection of material the maximum efficiency obtained was 9.75% at temperature 670 c Keywords: Flat Plate ...
Chapter 15 THERMODYNAMICS
... particles in a solid, we say that the entropy is low. At any given temperature, a solid will have a lower entropy than a gas, because individual molecules in the gaseous state are moving randomly, while individual molecules in a solid are constrained in place. Entropy is important because it determi ...
... particles in a solid, we say that the entropy is low. At any given temperature, a solid will have a lower entropy than a gas, because individual molecules in the gaseous state are moving randomly, while individual molecules in a solid are constrained in place. Entropy is important because it determi ...
Thermodynamics and Irreversibility
... consider a transformation of this cycle, the isothermal transformation. See Figure 4. An isothermal transformation is a transformation that takes place at constant temperature, in contact with a thermostat. Take for example a piston air-filled at 20˚ Celsius, in an external medium like water also at ...
... consider a transformation of this cycle, the isothermal transformation. See Figure 4. An isothermal transformation is a transformation that takes place at constant temperature, in contact with a thermostat. Take for example a piston air-filled at 20˚ Celsius, in an external medium like water also at ...
HEAT OF FUSION AND MECHANICAL EQUIVALENT OF HEAT
... speed. Because the braided copper band has much greater tension at one end than at the other, due to the friction, and because the tight end presses against the drum with greater force than does the looser end, the frictional force is different along different parts of the band. However, the design ...
... speed. Because the braided copper band has much greater tension at one end than at the other, due to the friction, and because the tight end presses against the drum with greater force than does the looser end, the frictional force is different along different parts of the band. However, the design ...
Optimal boiling temperature for ORC installation
... logarithmic mean temperature difference, o C quality rate of heat, W ...
... logarithmic mean temperature difference, o C quality rate of heat, W ...
New Methods in Heat Flow Analysis With Application to
... thermal potential, dissipation function, and generalized thermal force are introduced, leading to ordinary differential equations of the Lagrangian type for the thermal flow field. Because of the particular nature of heat flow phenomena, compared with dynamics, suitable procedures must be developed ...
... thermal potential, dissipation function, and generalized thermal force are introduced, leading to ordinary differential equations of the Lagrangian type for the thermal flow field. Because of the particular nature of heat flow phenomena, compared with dynamics, suitable procedures must be developed ...
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.