Autool LM110 Manuale d'uso - Pagina 10

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Superheat: evaporation outlet temperature- evaporation temperature.

The lower subcooling can make the refrigeration capacity of the system better.

Adding subcooling loop and economizer in the refrigeration system is to increase the

subcooling for refrigerant increasing.

The degree of expansion of the expansion valve (refrigerant charge) affects the

degree of super- heat. The greater degree of superheat, the smaller the opening of

the expansion valve can be determined( the refrigerant charge is fewer).

Sensible heat and latent heat

The amount of heat required to raise the water temperature from 0 degrees to 100

degrees is sensible heat, the water is heated to 100 degrees, and the hot water

becomes water vapor, but the temperature is still 100 degrees. The heat required for

this process is called latent heat.

Gauge pressure and absolute pressure

Gauge pressure: Refers to the pipeline pressure, or the pressure measured by

pressure gauges, vacuum gauges, U-shaped tubes, etc., also known as relative

pressure. The "table pressure" starts with atmospheric pressure and the symbol is

Pg.

Absolute pressure: The pressure directly acting on the surface of a container or

object is called "absolute pressure", the absolute pressure value is absolute vacuum

as a starting point, the symbol is PABS (ABS is a subscript) and the absolute

pressure is atmospheric pressure + gauge pressure.

At atmospheric pressure, the gauge pressure is 0 and the absolute pressure is 1.013

bar.

Dry Bulb Temperature Wet Bulb Temperature Black Ball Temperature

Dry bulb temperature: the temperature measured by ordinary thermometers.

Wet bulb temperature: a wet cloth is wrapped around the thermometer, and the

temperature indicates a drop due to the evaporation of water. The temperature at this

time is called the wet-bulb temperature.

The device, which has both the dry ball thermometer and the wet bulb thermometer,

is called the dry humidimeter, which can be used to measure the relative humidity in

the atmosphere.

Black ball temperature: also called actual temperature, it indicates the actual sensory

temperature expressed by temperature when a person or an object is combined with

radiant heat and convective heat in a radiant heat environment.

The black ball temperature measured is generally higher than the ambient

temperature, which is the air temperature.

Relative Humidity and Absolute Humidity

Absolute humidity: the mass of water vapor in a unit volume of air is called the

"absolute humidity" of air. It is a representation of the physical quantity of

atmospheric dryness and humidity. It is usually expressed in grams of water vapor

contained in 1 cubic meter of air.