Posted on Categories:Thermodynamics, 热力学, 物理代写

# 物理代写|热力学代写Thermodynamics代考|Getting properties in the vapor dome using quality

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## 物理代写|热力学代写Thermodynamics代考|Getting properties in the vapor dome using quality

You can use the quality to determine many thermodynamic properties, such as the specific volume, internal energy, enthalpy, and entropy of a liquid-vapor mixture. (I discuss the thermodynamic property of entropy in Chapter 8.) The following equation shows you how to calculate the enthalpy of a liquid-vapor mixture, using the quality and enthalpy values from the preceding example in this section:
$$h=x\left(h_{\mathrm{g}}-h_\rho\right)+h_f=0.12(2,675-417.4) \mathrm{kJ} / \mathrm{kg}+417.4 \mathrm{~kJ} / \mathrm{kg}=688.3 \mathrm{~kJ} / \mathrm{kg}$$

This equation can be written in similar ways to find the internal energy $(u)$, specific volume (v), or entropy (s) of a mixture using quality, as shown in these equations:
Internal energy: $u=x\left(u_g-u_q\right)+u_r$
Specific volume: $v=x\left(v_s-v_q\right)+v_f$
Entropy: $s=x\left(s_s-s_\rho\right)+s_f$

## 物理代写|热力学代写Thermodynamics代考|From saturated vapor to superheated vapor

Imagine you want to do something crazy like capture the steam (a saturated vapor) that’s coming from your pot of boiling water and heat it up even more. For liability purposes, I’m not giving you any ideas on how to do this. Adding heat to the steam causes its temperature to increase. Steam that’s hotter than the saturation temperature is called superheated steam or superheated vapor. Please be careful with superheated steam, because it will burn you, and you can’t see it! As the temperature of a superheated vapor increases, its specific volume also increases as long as the pressure remains constant.
Making superheated vapor isn’t really a crazy idea, except when it’s done in your kitchen. In fact, you’re no doubt breathing a superheated vapor right now. Yes, air is a superheated vapor because it’s hotter than liquid air at the same pressure. Superheated vapors don’t have to be hot, even though they sound hot. Superheated vapors run around inside your air-conditioning system at home and in your car (see Chapter 13). Power plants use superheated vapors all the time. A steam generator or a boiler creates superheated steam so it can be used to turn a turbine and make electricity. I discuss the thermodynamic analysis of a power plant in Chapter 12 .

You can find the energy in a superheated vapor from its temperature and pressure. I show you how to do this in the section “Interpolating with two variables.”

## 物理代写|热力学代写Thermodynamics代考|Getting properties in the vapor dome using quality

$$h=x\left(h_{\mathrm{g}}-h_\rho\right)+h_f=0.12(2,675-417.4) \mathrm{kJ} / \mathrm{kg}+417.4 \mathrm{~kJ} / \mathrm{kg}=688.3 \mathrm{~kJ} / \mathrm{kg}$$

## MATLAB代写

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