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.TT pocketEngineer softDesign - where pocketEngineer software lives...
 
 Qcondensate 1.2

calculate coil condensate flowrate, air mixing and state point pyschrometric air properties


 

                  

To take a glance at all pocketEngineer software and OS requirements, click Overview.

 

Qcondensate: made design easier for everyone  

Qcondensate program, an HVAC mobile design tool, performs quick calculations for AHU coil condensate, air mixing and state point psychrometric air properties. It is specially designed by a professional engineer to replace the conventional psychrometric chart (restricted scale and barometric pressure).

Aim: creating a mobile design environment (
ShowMe!) for the practising engineers & designers in today's mobile world.

Results: Instant solutions at your fingertips.

 

Highlights:

- calculate AHU coil condensate flowrate
- calculate air mixing and state point psychrometric air properties
- accurate formulation based on ASHRAE Fundamentals 2009.

- save results to text file for printing
- fully mobile program without setup requirement

- in SI & IP units

 

 

 AHU Coil Condensate Calculation . . .

Start collecting "green water" from AHU coil condensate today - save the water, save some money!. Performing condensate calculation is time consuming as it involves air mixing psychrometric air properties calculations. With Qcondensate program, it is easier than ever with solutions just a few clicks away.  

 

 Example 1: Coil Condensate + Air Mixing (in SI Units)

Find the AHU coil condensate flowrate as indicated in the schematic below:

 Point 1 (OA)

Q=151.2 CMH

Tdb = 30.5 oC

RH = 53%

 

Point 2 (RA)

Q=4528.8 CMH  

Tdb = 24 oC

RH = 50%          

 

Point 4 (off coil)

Tdb = 13 oC   

RH = 90%   

 

Solutions:

 

Step 1: Find air mixing properties at Point 3 (on coil).

 

 

 Air Mixing Properties Calculation
 ParameterPoint 1 Point 2 

 Point 3

 Q 151.2 4528.8 4680.0
 Tdb 30.524.0  24.2
 RH 5350  50.2
Twb 23.017.1  17.3

 

 

Step 2: Calculate condensate flowrate

 

Coil Condensate Water Calculation
---------------------------------------------------

altitude (m) = 0
Q (point 3) = 4,680.0
Tdb (point 3) = 24.2
Tdb (point 4) = 13
RH (point 3) = 50.2
RH (point 4) = 90
Twb (point 3) = 17.3
Twb (point 4) = 12.1
W (point 3) = 9.45073
W (point 4) = 8.38593
Mda (point 3/point 4) = 1.5202
Condensate Flowrate = 0.0016 kg/s
Condensate Flowrate = 5.83 l/hr      
     

-------------------------------------------------------
Legend:
Q = Airflow rate [CMH]
Tdb = Dry bulb temperature [°C]
RH = Relative humidity [%]
Twb = Wet bulb temperature [°C]
W = Humidity ratio [g(w)/kg(da)]
Mda = Mass flow of dry air [kg(da)/s]
Point 3 = on coil (entering air) conditions
Point 4 = off coil (leaving air) conditions                                         

 

 

Example 2: Coil Condensate (in IP Units)

100% outdoor air at 95 oF DB/40% RH enters the cooling coil. The air leaves the coil at 55 oF/85% RH. Assuming 1000 CFM of outdoor air is being conditioned, find the condensate water collected.

 

Solutions:

 

 Coil Condensate Water Calculation
----------------------------------------------------

altitude (ft) = 0
Q (point 3) = 1000
Tdb (point 3) = 95
Tdb (point 4) = 55
RH (point 3) = 40
RH (point 4) = 85
Twb (point 3) = 75.1
Twb (point 4) = 52.5
W (point 3) = 0.01413
W (point 4) = 0.00780
Mda (point 3/point 4) = 69.9265
Condensate Flowrate = 0.0074 lb/s
Condensate Flowrate = 0.43 ft³/hr          

-------------------------------------------------------
Legend:
Q = Airflow rate [CFM]
Tdb = Dry bulb temperature [°F]
RH = Relative humidity [%]
Twb = Wet bulb temperature [°F]
W = Humidity ratio [lb(w)/lb(da)]
Mda = Mass flow of dry air [lb(da)/min]
Point 3 = on coil (entering air) conditions
Point 4 = off coil (leaving air) conditions            
                             

 

 

Air Mixing / State Point Psychrometric Properties . . . 

A handy psychrometric calculator - find or check air mixing and state point air properties quickly without reading a psychrometric chart.

 

With input Tdb + Twb or RH, Qcondensate program let you quickly find/check the the following air properties at anytime, anywhere:

 

Parameters  SI UnitsIP Units Input range 
 altitudeft 

-500 to 10000m

(-1640 to 32800ft) 

 Tdbo oF

 -40 to 100 oC

(-40 to 212 oF)

 RH %0<RH<=100
 Twb oC oFmax. = Tdb
 Tdpo oF 
 rhokg/m3  lb/ft3 
 Wg/kg lb/lb  
 v m3/kg ft3/lb 
 h kJ/kgBTU/lb  
 P Pain.Hg  
 Pws Pa in.Hg 
 P Pain.Hg  
 Q (for air mixing) CMHCFM>= 0 
 Mda (for air mixing) kg/slb/min  
 Mw (for air mixing) kg/s lb/min 
 Legend:

Tdb = Dry bulb temperature
RH = Relative humidity
Twb = Wet bulb temperature
Tdp = Dew point temperature
rho = Density
W = Humidity ratio
v = Specific volume
h = Enthalpy
P = Atmospheric pressure
Pws = Saturation vapour pressure
Pw = Partial water vapour pressure

Q = Airflow rate

Mda = Mass flow of dry air
Mw = Mass flow of water vapour

 

 

Example 3: Adiabatic Mixing of 2 Moist Airstreams (in SI Units)

A stream of 7200 CMH of outdoor air at 4 oC dry-bulb temperature and 2 oC wet-bulb temperature is adiabatically mixed with 22500 CMH of recirculated air at 25 oC dry-bulb temperature and 17.9 oC wet-bulb temperature. Find the thermodynamic properties of the resulting mixture.

 

Solutions:

 

The following results are performed with Qcondensate - Air Mixing module.

 

 ParameterPt. 1  Pt. 2

 Pt. 3

(mixed air)

 Q720022500 29700 
 Tdb 425 19.9 
RH70.7 50.1 57.2 
Twb 217.9 14.7 
 Tdp -0.913.9 11.2 
rho 1.2711.177 1.199 
 W 3.5509.901  8.270
 v 0.78960.8581 0.8412 
h12.93 50.37 40.76 
Mda2.533 7.284 9.817 
Mw0.009 0.072 0.081 
 P 101325101325 101325 
 Pws 813.53169.2 2325.7 
 Pw 575.1 1587.81329.7 

 

Need to understand more about Psychrometrics! Follow me to

Wiki's Psychrometrics.


 

Experience yourself the mobility of Qcondensate

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OS requirements: Windows, Windows Mobile (not Windows Phone OS).

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 in SI & IP units

 Qcondensate Main Menu

  see Qcondensate explained

 

 Condensate module

 

Air Mixing module

 

Air Mixing Results 

 

State Point module