Estimation program, Estimate, spent study, Monthy progress payment, bid, bills of quantities, filtering spent study, currencies conversion, Construction Cost Psychrometric calculation (Mixture of air) - by-pass Factor - Humidification by steam - Adiabatic, temperature of saturation - Wet bulb temperature (BHS) - Flow condensates - transfer energy in the coil.
French site
| Home | Thematic | Tables | Programs | Library | Download | Links | Contact | Forum |

_You are in the heading

 
--
 
PsychroSI program (mixed air calculation)
Programs
DevExcel
PsychroSI
AeroDuct
HydroTherm
HydroWater
ThermoVapor
AeroGaz
ThermGaz
Sundry programs




Psychrometric calculation in air mixture with reheating

Psychrometric calculation (Mixture of air) - by-pass Factor

Simple reheating applies to the majority of the generators of heat used for the control of the temperature in the buildings.

The dry temperature increases, the temperature of dew and thus specific moisture remains constant.

The program can be used to carry out calculations in any new air, it will simply be enough nothing to input in the column B.

Heating of a room

Input the temperature of the room in winter in the case of a ambient heating. The thermal power of the coil must compensate for the losses of the room and the reheating of the new air at the ambient temperature.

The simple reheating of the air of A to B can be represented according to the following diagram:

  • The dry temperature (t) increases.
  • The dew temperature (tr) and thus specific moisture remain constant.
  • The rate of hygroscopic at contrary decreases.
  • The wet temperature (th) increases.
equations, psychrometric, air, by-pass, density, factor, heat, enthalpy, humidifier, vapour

Vapor humidifier: Evolution in the diagram of the humid air

The dry air (1) at the entry of the humidifier follows an evolution at constant temperature to be found at the exit as in point (2)

moisture, content, dew, humidifier, adiabatic, relative, humidity, saturation, temperature humidifier, adiabatic, relative, humidity, saturation, temperature, wet, bulb, BHS, condensates, flow, transfer

Actually, a very light heating exists, but negligible in practice thus ignored in the study.

Psychrometric calculation in mixture of air with cooling

Humidification by steam - Adiabatic temperature of saturation - Wet bulb temperature (BHS) - Flow condensates

Psychrometric calculation (Mixture of air) - by-pass Factor - Humidification by steam

In the majority of the applications of air conditioning, the air is partially dehumidified during the cooling of the air in the battery.

  • Point A = State of the air at the air intake in the battery (Dry temperature and moisture)
  • Point B = State of the air at the exit of air in the battery (Cooling and dehumidification)
  • Point B1 = State of the air at the exit of air in the battery (cooling with constant specific moisture).
  • Point C = outside temperature of wall (Tp) of the cooling coil. This temperature is calculated by the following empirical formula by considering that this temperature is not uniform of a point to another of this surface:
Dry temperature - Wet temperature - Dew temperature - Relative humidity - Specific moisture - Enthalpy - Density
  • th = Wet temperature
  • T E_eau = Temperature of entered of water at the coil

program, software, softwares, computation, calculation, calculations, equations, psychrometric, air, by-pass, density, factor,
heat, enthalpy, humidification, vapour, dewpoint, moisture, content, dew, humidifier, adiabatic, relative, humidity, saturation,
temperature, wet, bulb, BHS, condensates, flow, transfer, energy, volume, dehumidification, cooling, conditionning, coil, coils,
battery

Last update:

 

Copyright 2003-2014 - ThermExcel - All Rights Reserved