Heat Transfer
The three modes of heat transfer.
Conduction, convection, radiation
The phase of water at 25°C and 5 kPa.
compressed liquid
The maximum coefficient of performance of a refrigeration cycle with maximum and minimum temperatures of 293 K and 265 K, respectively.
9.46
This is how we determine if a system is closed or open.
Mass crosses boundary of open system.
This SI unit is equivalent to one Newton per square meter.
Pa
Mode of energy transfer between a solid surface and the adjacent liquid or gas that is in motion.
Convection
The phase of water at 3.0 kPa and 30°C.
superheated vapor
The amount of work done by air that expands at a constant pressure of 100 kPa from a volume of 0.1 m3 to 0.2 m3.
10 kJ
The ideal version of this cycle consists of the following processes: isentropic compression, constant-volume heat addition, isentropic expansion, and constant-volume heat rejection.
Otto cycle
This prefix means 106.
mega, M
Property that is a measure of the ability of the material to conduct heat.
thermal conductivity
In a saturated mixture, this is the ratio of the mass of the vapor to the total mass.
quality
The log mean temperature difference of a counterflow heat exchanger that heats water from 20°C to 80°C with hot water that enters at 160°C and is cooled to 125°C.
91.9°C
This word means no heat transfer.
adiabatic
This SI unit is equivalent to one joule per second.
watt (W)
Dimensionless number used to determine if flow is laminar or turbulent.
Reynolds number
The quality of a saturated liquid.
0
The thermal resistance of a 0.2-m-thick wall with an area of 10 m2, if the wall has a thermal conductivity of 1.0 W/m∙K.
0.02 K/W
The value of this constant is 5.670×10-8 W/m2∙K4.
Stefan-Boltzmann constant
This SI unit is equivalent to one Newton times one meter.
joule (J)
Typical units for the overall heat transfer coefficient.
W/m2∙K
This property is equivalent to internal energy plus pressure times volume.
enthalpy
Oil with a density of 780 kg/m3 is discharged from a pipe with a volume flow rate of 0.2 m3/min. Determine the mass flow rate in units of kg/s.
2.6 kg/s
This statement of the 2nd law states that heat flows spontaneously from high to low temperature, but not conversely.
Clausius statement
This prefix means 10-6.
micro (μ)