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Figure 4-9 is actually a plot in the optimum number of water vapor per lb of atmosphere against atmosphere heat

Figure 4-9 is actually a plot in the optimum number of water vapor per lb of atmosphere against atmosphere heat

The X-axis try temperatures. The rounded a€?maximum water vapour linea€? is called the a€?saturation range.a€? Furthermore named 100per cent comparative moisture, abbreviated to 100% rh. At any point-on the saturation range, the atmosphere has 100percent of this water vapour per lb of environment that may coexist with dry-air at that heat.

Whenever the same volume of environment contains just half the weight vapor this can hold at this temperatures, we call-it 50per cent comparative humidity or 50percent rh. This might be found in Figure 4-10 . Air any kind of time point on the 50% rh line provides half water vapor that the exact same amount of environment might have at that temperature.

As you can see from the information, the maximum amount of water vapor that moist air can contain increase rapidly with increasing heat. 4per cent of its weight as water vapour. But inside, at a temperature of 72A°F, the moist air can have nearly 1.7per cent of the pounds as water vapor a€“ over fourfold as much.

On a miserable damp time it may be 36A°F outside, because of the atmosphere somewhat damp, at 70% relative dampness. Bring that environment to your building. Heating it to 70A°F. This delivers the comparative moisture down seriously to about 20%. This change in relative moisture is actually revealed in Figure 4-12 , from aim 1 a†’ 2. an awesome damp time outside yields atmosphere for a dry time inside! Note that the absolute number of water vapour in the air enjoys remained the same, at 0.003 lbs of water vapor per pound of dry air, but due to the fact temperature rises, the family member humidity comes.

Suppose it’s a warm day with some other heat of 90A°F and relative dampness at 40per cent. We Now Have an air-conditioned space which at 73A°F. A few of the external environment leaks into our air-conditioned area. This leakage is named infiltration.

The Y-axis could be the proportion vapor to dry-air, calculated in lbs of water vapor per lb of dry air

Comparative humidity of 70percent is actually high enough to cause shape trouble in houses. For that reason, in hot-moist environments, avoiding infiltration and shape generation, it is important to keep up a small good force in structures.

There is certainly a certain level of electricity in the air mixture at a particular temperature and pressure. This delivers united states on the 2nd idea that the psychrometric information illustrates. There is certainly a specific amount of electricity in the air water-vapor mix at a particular temperature. The energy of the mix is dependent on two methods:

There was even more power in atmosphere at higher temps. The addition of heating to raise the temperature is called including a€?sensible temperatures.a€? Addititionally there is much more electricity when there is additional water vapor floating around. The power that water vapor includes is referred to as the a€?latent heat.a€?

The way of measuring the total fuel of the sensible heat in the air additionally the hidden heating in the water vapor is often known as a€?enthalpy.a€? Enthalpy tends to be raised with the addition of fuel for the blend of dry-air and water vapor. This might be attained by incorporating https://besthookupwebsites.net/tr/hookup-inceleme/ either or both:

Regarding the psychrometric data, outlines of constant enthalpy pitch down from kept to proper as shown in Figure 4-13 and they are labeled a€?Enthalpy.a€?

Like, moist atmosphere on freezing point, 32A°F, can incorporate just 0

The zero was arbitrarily picked as zero at 0A°F and zero moisture contents. The system assess for enthalpy is actually Uk Thermal models per pound of dry air, abbreviated as Btu/lb.

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