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Psychrometric Chart

Information

Processes

Name	Start point					End point				Q, kW	W, kg/h
	No	t, °C	φ, %	L, m³/h		No	t, °C	φ, %	L, m³/h

Name

Start point

End point

Q, kW

W, kg/h

t_c, °C

t, °C

t_wb, °C

t_dp, °C

φ, %

d, g/kg

I, kJ/kg

ρ, kg/m³

P_p, Pa

P_s, Pa

L, m³/h

G, kg/h

t, °C

t_wb, °C

t_dp, °C

φ, %

d, g/kg

I, kJ/kg

ρ, kg/m³

P_p, Pa

P_s, Pa

L, m³/h

G, kg/h

Enthalpy I, kJ/kg

Settings

Air specific heat capacity C_p, kJ/(kg • K)

Barometric pressure P_b, Pa

Show point numbers

Dark theme

Orientation

Portrait

Landscape

Cancel

Process

Information

Start point

Temperature

By relative
humidity

By specific
humidity

By enthalpy

Air flow

Volume

Mass

Process name

Temperature t, °C

Relative humidity φ, %

Air flow L, m³/h

Advanced

Process name

Start point number

Second flow point number

End point

By tempe-
rature

By capacity

By tempe-
rature

By capacity

Cooling coil surface temperature t_c, °C

Temperature

By relative
humidity

By specific
humidity

By enthalpy

Air flow

Volume

Mass

By relative
humidity

By specific
humidity

By moisture
exudation

By tempe-
rature

By relative
humidity

By specific
humidity

By moisture
exudation

By relative
humidity

By specific
humidity

By moisture
adsorption

Total heat exudation Q, kW

Moisture exudation W, kg/h

Process length change

By tempe-
rature

None

Temperature, the process length is changed by Δt, °C

Process name

Temperature t, °C

Relative humidity φ, %

Air flow L, m³/h

Air flow

Temperature t, °C

Volume air flow rate L, m³/h

Mass air flow rate G, kg/h

Examples

Winter 1

1. Heating

Heating by an AHU air heater.

Download project

Winter 2

1. Heating

Heating by an AHU air heater.

2. Steam humidification

Humidification by an AHU steam humidifier.

Download project

Winter 3

1. Heating

Heating by an AHU air heater.

2. Mixing

Mixing of the AHU supply and return air flows.

3. Angle factor

Cooling by the room heat loss.

Stipulation of idem or close match of the following points on the chart shall be fulfilled:

Start point of the second flow of the process #2.
End point of the third process #3.

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Winter 4

1. Heating

Heating by an AHU air heater.

2. Heating

Heating by a unit heater.

3. Mixing

Mixing of the air flows of AHU and unit heater.

4. Angle factor

Cooling by the room heat loss.

Stipulation of idem or close match of the following points on the chart shall be fulfilled:

Start point of the process #2.
End point of the third process #4.

Download project

Winter 5

1. User

Heating by an AHU wasteheat exchanger.

Angle factor process could be used instead of the user process.

2. Heating

Heating by an AHU air heater.

Download project

Summer 1

1. Cooling

Cooling by an AHU cooling coil.

2. Angle factor

Heating and humidification by heat and moisture gain of the room.

Download project

Summer 2

1. Mixing

Mixing of the AHU supply and return air flows.

2. Cooling

Cooling by an AHU cooling coil.

3. Angle factor

Heating and humidification by heat and moisture gain of the room.

Stipulation of idem or close match of the following points on the chart shall be fulfilled:

Start point of the second flow of the process #1.
End point of the third process #3.

Download project

Summer 3

1. Cooling

Cooling by an AHU cooling coil.

2. Cooling

Cooling by a split system.

3. Mixing

Mixing of the air flows of AHU and and split system.

4. Angle factor

Heating and humidification by heat and moisture gain of the room.

Stipulation of idem or close match of the following points on the chart shall be fulfilled:

Start point of the process #2.
End point of the third process #4.

Download project

Summer 4

1. Adiabatic dehumidification

Dehumidification by an AHU adsorption dehumidifier.

2. Cooling

Cooling by an AHU cooling coil.

3. Angle factor

Heating and humidification by heat and moisture gain of the room.

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Summer 5

1. Adiabatic humidification

Direct evaporative cooling in an AHU trickling spray chamber.

2. Angle factor

Heating and humidification by heat and moisture gain of the room.

Download project

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