Subcooled vapor refers to a vapor that is at a temperature lower than its saturation temperature at a given pressure. In other words, it is a vapor that is in a superheated state but exists at a temperature below its boiling point at the current pressure. Subcooled vapor is not in equilibrium with its liquid state and is considered to be in a superheated state.
When heat is added to a saturated vapor, its temperature will increase and the vapor will start to undergo phase change into a superheated vapor. This means that the vapor will contain more thermal energy than at saturation conditions, which leads to a rise in temperature without a change in pressure.
for English units, see this table http://energy.sdsu.edu/testcenter/testhome/Test/solve/basics/tables/tablesPC/superR134a-Eng.html (click on SI once there for SI units if needed). If you need higher pressure than 400psia or 16MPa, you will need the R143a superheated vapor chart, which I can't find online. You can find tables and charts in various thermodynamics textbooks. For example, Tables in "fundamentals of engineering thermodynamics" by Moran and Shapiro; or the chart by "SUVA/DuPont" is in the appendix of the "mechanical engineering reference manual" by Lindeburg.
A metal clad heating element 8 mm in diameter and emissivity ɛ = 0.95 is horizontally submerged in a water bath. The surface temperature of the metal is maintained at 250°C under steady state conditions. Estimate the power dissipation per unit length of the heater. Assume the water is exposed to atmospheric pressure and is at a uniform temperature.
To fully specify superheated vapor, you need to know the substance involved (e.g., water, steam), its pressure, temperature, and specific volume. Additionally, information on the phase state (gas), the degree of superheat, and any relevant thermodynamic properties like enthalpy or entropy may also be required.
superheated vapor is a vapor that has been heated above its boiling point.
The only location where the refrigerant vapor is superheated is in the evaporator section of a refrigeration or air conditioning system, specifically after it has absorbed heat from the space being cooled. In this section, the refrigerant transitions from a liquid to a vapor state, and if it continues to absorb heat beyond the phase change, it becomes superheated. This superheated vapor then moves to the compressor, where it is compressed to a higher pressure.
becaause it was just compressed by the compressor and is the high side of the system before the tex valve
Subcooled vapor refers to a vapor that is at a temperature lower than its saturation temperature at a given pressure. In other words, it is a vapor that is in a superheated state but exists at a temperature below its boiling point at the current pressure. Subcooled vapor is not in equilibrium with its liquid state and is considered to be in a superheated state.
superheated vapor
Refrigerant enters a direct expansion evaporator as a saturated liquid vapor mix and leaves as a superheated vapor.
there are two types of water vapor it is a evaporation and condensation
In the natural environment, probably in geysers which, because of their pressure, contain superheated steam.
When a refrigerant is above its saturation temperature, it is in the superheated state. This means that it has taken on additional heat energy beyond what is needed for boiling at its current pressure. In this state, the refrigerant is a gas and can continue to absorb more heat without converting to a liquid.
When heat is added to a saturated vapor, its temperature will increase and the vapor will start to undergo phase change into a superheated vapor. This means that the vapor will contain more thermal energy than at saturation conditions, which leads to a rise in temperature without a change in pressure.
for English units, see this table http://energy.sdsu.edu/testcenter/testhome/Test/solve/basics/tables/tablesPC/superR134a-Eng.html (click on SI once there for SI units if needed). If you need higher pressure than 400psia or 16MPa, you will need the R143a superheated vapor chart, which I can't find online. You can find tables and charts in various thermodynamics textbooks. For example, Tables in "fundamentals of engineering thermodynamics" by Moran and Shapiro; or the chart by "SUVA/DuPont" is in the appendix of the "mechanical engineering reference manual" by Lindeburg.
A metal clad heating element 8 mm in diameter and emissivity ɛ = 0.95 is horizontally submerged in a water bath. The surface temperature of the metal is maintained at 250°C under steady state conditions. Estimate the power dissipation per unit length of the heater. Assume the water is exposed to atmospheric pressure and is at a uniform temperature.