[Outdoor Fresh Air (Point A)] ----\ +---> [Mixed Air State] ---> [Treatment Battery (Coil)] [Indoor Return Air (Point B)] ----/
is a powerful, VBA-driven Excel software designed for precise thermodynamic calculations of moist air states, air mixing, and HVAC thermal systems . In heating, ventilation, and air conditioning (HVAC) engineering, evaluating psychrometric changes is critical for sizing Air Handling Units (AHUs), calculating coil loads, and maintaining indoor air quality.
Thermal Systems Analysis Unit For questions: technical@thermalsystems.example.com
How to integrate PsychroSI results into other like AeroDuct or HydroTherm.
To model, calculate, and optimize this process, engineers need robust software. Enter —a powerful, Excel-based psychrometric toolkit. This article provides a comprehensive guide to using the ThermExcel programme for psychrosi , covering its theoretical foundations, step-by-step application, and practical benefits. thermexcel programme psychrosi
is a specialized Microsoft Excel-based engineering software program developed by ThermExcel for calculating the thermodynamic properties of moist air (psychrometrics). Built entirely within the Excel VBA environment, this programmatic tool replaces manual psychrometric charts with instant, iterative calculations for complex air conditioning, heating, ventilation (HVAC), and indoor swimming pool thermal management projects. It is widely used by thermal engineers to model air handling systems, evaluate air mixing behaviors, and size equipment such as heating coils and chilled water batteries.
: Simulates raising the dry bulb temperature while dewpoint temperature and specific moisture remain locked. The program maps how the relative humidity drops while wet-bulb temperature scales upward.
Future developments of the ThermExcel programme for psychroisis may include:
For psychrosi, where you often need to iterate coil ADP to meet a target leaving humidity, ThermExcel’s built-in Goal Seek feature is invaluable. Example: "Find ADP such that W2 = 0.008 kg/kg." [Outdoor Fresh Air (Point A)] ----\ +---> [Mixed
The PsychroSI module is not just a single calculator; it is a suite of tools designed for specific real-world engineering scenarios. The most notable capabilities include:
Psychrometric processes — including sensible cooling, cooling with dehumidification, evaporative cooling, and frost prevention — are central to air conditioning, refrigeration, and industrial drying. Designing efficient heat exchangers for such processes requires precise modeling of heat and mass transfer between air and a refrigerant or chilled water.
program by ThermExcel is a specialized psychrometric calculation software designed for analyzing humid air states and HVAC processes. It serves as a digital alternative to manual psychrometric charts, allowing for precise determination of air properties and thermal calculations. ThermExcel Core Capabilities
: Select the transformation type (e.g., sensible heating, cooling with condensation). Review Heat Loads To model, calculate, and optimize this process, engineers
The software determines the complete state of humid air based on two known input variables: Dry-bulb temperature + Relative humidity Dry-bulb temperature + Wet-bulb temperature Dry-bulb temperature + Specific humidity (moisture content) Dry-bulb temperature + Enthalpy Relative humidity + Specific humidity Specific humidity + Enthalpy
For psychrosi, the SHR is typically between 0.6 and 0.8, indicating that 20–40% of the coil’s capacity is dedicated to dehumidification (latent cooling).
. Développé par l'ingénieur Jean Yves Messe, ce logiciel est une référence incontournable pour les professionnels du génie climatique (CVC), de la climatisation et du traitement de l'air. Grâce à des macros écrites en VBA, il permet de modéliser avec précision le comportement thermique de l'air lors de processus complexes comme le chauffage, le refroidissement, le mélange d'air ou l'humidification adiabatique.
┌─────────────────────────────────────────┐ │ ThermExcel PsychroSI Engine │ └────────────────────┬────────────────────┘ │ ┌─────────────────────────────┼─────────────────────────────┐ ▼ ▼ ▼ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ │ Air Treatment & │ │ Indoor Swimming │ │ Global Weather │ │ AHU Sizing │ │ Pool Design │ │ Data Library │ └─────────────────┘ └─────────────────┘ └─────────────────┘ 1. Air Treatment & Air Handling Unit (AHU) Sizing
The is far more than a simple psychrometric calculator. It is a professional‑grade, Excel‑integrated tool that accurately models all the fundamental processes affecting humid air – from simple heating and cooling, through adiabatic humidification and evaporative cooling, to air mixing and swimming‑pool dehumidification. Its iterative wet‑bulb algorithm, multiple input options, and direct integration with the wider ThermExcel suite make it an ideal choice for HVAC engineers, building service designers, and industrial process engineers who need reliability, flexibility, and a familiar spreadsheet environment.
Jim Corbett Biography
