Pressure unit of the technical problems

Pressure unit of the technical problems

Pressure unit

First, the pressure (pressure) is the force per unit area under pressure: Absolute pressure, gauge pressure, atmospheric pressure. Relationships: absolute pressure = gauge pressure + atmospheric pressure

* Absolute Pressure (Absolute Pressure): When the pressure difference between that and full vacuum. Measured at the actual pressure.

* Gauge pressure (Gage Pressure): When the value of the gas, said area with the atmospheric pressure difference.

* Atmospheric pressure: (Pressure Atmospheres) generated by the weight of atmospheric pressure, standard atmospheric pressure is 29.92 "inches Hg pressure pressure include: total pressure (PT) = static pressure (Ps) + dynamic pressure (Pv) is the speed pressure (VP). Total Pressure = Static Pressure + Dynamic (Velocity) Pressure. the pressure generated by fans, are to measure the water column, due to fan pressure used are very small; while the density of mercury great (1mmHg = 13.6mmAq) use of mercury (mmHg) to measure, the reading is not clear, so use more water column (mmAq or mmH2O) to measure or calculate, such as: the use of mercury is expressed, 760mm Hg = 760 mmHg. use that when the water column, 100mm water column = 100 mmAq. = (4 "wg) Aq Aqua is the abbreviated Latin. 1mmAq the pressure of about = 1kg/m2. A standard pressure = 1.0332kgf/cm2 = 10.34mAg = 760mmHg = 29.92inHg inch Hg (Kg of mass units, Kgf to weight units.)

Second, the pressure of common units (CNS 7778) (Note 2) atm Atm. (Pressure Atmospheres) = 760mmHg. Pressure that, subject to atmospheric pressure, this pressure is higher than those for the pressure, this pressure is lower than those for the negative; speed pressure will be as positive pressure. Inch mercury (Hg) column: ("Hg) × 3.377 = KPa. Inches water column: (" Wg or H2O) × 0.249 = KPa. Ft water column: ('Wg) × 2.989 = Kpa kg / m: kg/m2; kg/cm2 × 98 = KPa (1mmAq = 9.797Pa <9.8Pa = 9.8Pa) friction "wg/100' × 8.2 = Pa / m "wg/100 '× 98.1 = Pa / m mAq × 9.8 = KPa; mmAq × 0.0098 = KPa; mmAq / m × 9.8 = Pa / m Weight: pounds / square inch (lbs/in2 or Psi × 6.895 KPa). (1Kg = 2.205lbs)

Third, the meaning of the term (CNS 7778B4046) (Note 2)

1. ... * Total pressure total pressure blower, is due to the total pressure blower to increase the amount of the proceeds to import and export of the blower, said full pressure. * In any section of the catheter at, all have static air pressure and speed, both the algebra and is called total pressure.

2. ... * Static pressure blower static pressure is the total pressure by the blower, blower outlet minus the dynamic pressure is concerned. That is, after all Yajian hydrodynamic pressure, is called static pressure. * When a stationary flow is still in a closed container for any direction perpendicular to the flow direction, the pressure generated by the potential, this is called hydrostatic pressure.

3 speed pressure ... * in the beginning to promote the kinetic energy of the gas flow direction, flow rate from rest to reach a particular road, it will produce a certain pressure, this pressure is called velocity pressure. * Rate pressure, ie with the pressure generated by the wind. * After all Yajian static pressure, this pressure is called dynamic pressure.

4 blower's air intake: the value obtained by the experiment and then converted into the standard state volume of inhaled air. Unless specified, the blower inlet air volume m3/min said.

5 blower axis of power: that of power from the blower input shaft. If you use the drive device, and its loss of power is not easy to determine who places the input gear of the driving force for the blower shaft power.

6 blower's rated to the number: using motor driven, should be in the high rated power of the voltage frequency required, with the other driving force behind the drive will, in nominal operating conditions, to drive the blower when the unit of time of rotation required . Note: This rotational speed may change due to air the number of changes, if needed, said the number of its rotation, the places rated air blower when the rotation is represented.

7 Blower Noise: to determine its operation, the blower inlet central source of the noise level on the size.

8 density factor: the actual air density to standard air density ratio.