# About Psychrometric chart Pro software

Psychrometric Chart Pro is a convenient and easy to use tool for every-day HVAC calculations. Calculations on HVAC processes such as: humidifying, heating and cooling. The outcome of these calculations is easily exported in a Microsoft Excel.

## Key features of Psychrometric Chart Pro

• Easy enthalpy calculation
• Input of calculations is simple through clicking on the wanted points in the diagram
• Supported temperature range of -25 °C to 200 °C
• Selection of heights ranging from 0m to 2490m
• Air units calculations for heating, cooling and humidifying
• Heat wheel models, Twincoil models and crosflow models
• Mixing of different 'buckets'of air
• Heatpump models
• High Resolution printing
• Input of air Pressure
• Temperature resolution of 0.1 °C and relative moisture humidity resolution of 1%

## Examples of practical use cases of Psychrometric chart

### Humidifier

When humidifying air with Steam from H1 to H2 8.5g/kg- 2g/kg)= 6.5g moisture is brought into the air. Note that the relative moisture humidity is also changes from 20% to 80%. When humidifying air with spray water from H3 to H4 then (15.7-10.3) = 5,4g moisture is brought into the air. The costs of evaporation heat to vapor water to vapor form. That's the reason the temperature is getting lower from 34.5 °C to 21 °C. You can practicaly apply this on a hot summer day by spraying water on the roof of you house and through this cool your house. If you bring more spray water into the air then the air can't hold it because the air is already humidified upto 100% and you have reached the boundary. Then the water begins to drop down as condensed liquid water.

### Heating of air

If you need to heat 1kg air = 0,883 m3 from 20 °C to 30 °C. Than you need:(40 kj/kg -30 kj/kg) * 1 kg Air = 10 kj of energy. If you want heat 0,883m3/s air from 20 °C to 30 °C with an air heater than the capacity = 10kW. Look that the absolute humidity is not changing. There is still 4 g/kg moisture in the air only

### Comparing efficiency of cooling methods - adiabatic cooling vs. direct expansion cooling

With Program Psychrometric chart you can easily compare two ways of cooling. For example one can compare a modern cooling method such as adiabatic cooling with compression direct expansion cooling. The performance of the two cooling methods is easily compared with Psychrometric chart Pro. The resulting models of adiabatic cooling and direct expansion cooling are presented in the overview below.
The high pressure water mist can open space to serve the adiabatic air cooling. There may be a drop in temperature to be achieved from about 10 °C, and this can, for example, be achieved with a heat exchanger or a heat wheel. In some cases, the adiabatic cooling of the mechanical cooling or take unnecessary to changing weather conditions in spring or autumn. Each kilogram of water that evaporates into the air adiabatically, has a cooling capacity of 640 Watt. In other words, a system with a cooling capcity of 100 liters per hour has an energy need of 64 kWh. The ciculation pump consumes about 4 watts per kg of water. to this cooling effect to obtain, there is no special treatment for the water. Moreover, high pressure systems are much more efficient than low pressure systems.