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Psychrometrics: Calculations of the mass flow rate of the dry air component (assumed constant under steady state) from the ENTRY volumetric flow rate of the humid air mixture MUST use the INITIAL state variables!

Psychrometrics: The volumetric flow rate of a humid air mixture MAY change between a State1 and State2 (but the mass flow rate of dry air does not under steady state)! This is sometimes "glossed over" in some online calculators and less formal guides.

Psychrometrics links (references and online calculators)

Keywords

This page collects some useful External links (see section below) for Psychrometrics (humid air physics).

An air-conditioned room at sea level has an indoor design temperature of 75°F and a relative humidity of 50%. Determine the humidity ratio, enthalpy, density, dew point, and thermodynamic wet bulb temperature of the indoor air at design condition.

Source

CED Engineering course PDF: 'Air Conditioning Psychrometrics (A.Bhatia)'

TRAIL: Air Conditioning Psychrometrics (vs CED Engineering course): Example results (only) in Mathematica and SysML using the Webel Psy package and MPsy class

Jump to first slide

Example 01: Values from 'tdb' and relative humidity 'r'

Sections

HVAC&R Zone

Keywords

This zone presents some reference information on Heating, Ventilation, Air-Conditioning, and Refrigeration (HVAC&R), including some worked examples in Mathematica and SysML models.

GOTCHA: Mathematica: Specific enthalpy conversion J/kg to Btu/lb: Does not consider a possible "total" enthalpy reference offset vs 0 °C or 0 °F respectively

Simulation of the refrigerant cycle Activities and StateMachine in Cameo Simulation Toolkit

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

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Slide kind

snapshot

Refrigerant cycle Activity allocation

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

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Slide kind

hybrid diagram

MagicDraw/Cameo: allocation matrix

SysML Block Definition Diagram (BDD)

Activities driving Refrigerant states transitions

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

Section

Slide kind

hybrid diagram

SysML Activity Diagram

IBD: Context for SimpleDomesticInverterAirCon - detailed

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

Section

Slide kind

SysML Internal Block Diagram (IBD)

IBD: Context for SimpleDomesticInverterAirCon

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

Section

Slide kind

SysML Internal Block Diagram (IBD)

BDD: InverterSubsystem

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

Section

Slide kind

SysML Block Definition Diagram (BDD)

Overview of two SysPhS-style physical interaction Port types

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

Section

Slide kind

SysML Package Diagram

Overview of ValueTypes and Units

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

Section

Slide kind

SysML Package Diagram

Overview of flowing quantities and Port types with flows

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

Section

Slide kind

SysML Package Diagram

BDD: SimpleDomesticInverterAirCon

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

Section

Slide kind

SysML Block Definition Diagram (BDD)

Package Diagram overview of a simple domestic air conditioner with an inverter

Gallery

Tutorial

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

Section

Slide kind

SysML Package Diagram

TRAIL: SysML: Simple model of an air conditioner with a refrigerant cycle and StateMachine driven by Activities in MagicDraw/Cameo

Jump to first slide

IBD: Context for SimpleDomesticInverterAirCon

Sections

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