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the home of .TT pocketEngineer softDesign - where pocketEngineer software lives...
 
 swimming pool pump and filtration calculator on Android (aPocketPool r2.0)

swimming pool filtration system, pool heat-up and heat losses, pool chlorination, and more . . .


 

 

                  

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

 

 a PocketPool : a design tool for swimming pool system designer 

Engineered design tools for swimming pool system designers, you can complete design in just a few clicks... find filtration pump flow rate, number of filter, balance tank volume, backwash tank volume, number of skimmer, amount of chemical required, chlorine solution dilution, heat-up heat, heat losses, etc.


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

Results: Instant solutions at your fingertips.

 

Highlights:

- calculates filtration pump flow rate, filter sizing, balance tank, backwash tank, skimmer, etc.

 

- built-in selections like turnover rate, filter type, filter area, filter loading rate, pool shape, pool area and volume calculation.

 

- design tool modules include:

a) Hypochlorite chlorination calculation.

b) Pool heat-up heat calculation.

c) Pool heat losses calculation.

 

- "save-to-file" function with built-in result file viewer.

 

- in SI-IP Units.

 

 

 

  Calculation Example 1: 

Pool filtration sizing . . .  

Size the pool filtration system for the following pool.

 

 

W=33', D1=4', D2=6', L1=16', L2=16', L3=50'

 

 

The following design calculations are done with aPocketPool program:  

Worked Example (in IP units)

 

Pool Filtration Calculations
=======================

*** inputs ***
Pool area = 2706 ft2 (using built-in area & vol. calculator)
Pool volume = 109605 USgal

Bathing load = 25 ft2/p
Bather weight = 140 lb
Wave action/displacement = 0.065 ft

Turnover rate = 6 hr.

Filter type = D.E. filter
Filter loading rate = 2.5 gpm/ft2
Filter area (each) = 72 ft2

Backwash rate = 2.5 gpm/ft2
Backwash duration = 3 min.

 

*** results ***
Pump flowrate (USgpm) = 304.5

Filter area required (ft2) = 121.8
Nos. of Filter = 2

Wave displacement vol. (USgal) = 1316
Bather displacement vol. (USgal) = 1816
Backwash tank vol. (USgal) = 913

Balancing tank vol. (USgal) = 4045

 

 

 

 

 

 

 Calculation Example 2: 

Chemical chlorination dosing. . .  

A pool water test has determined that a total chlorine dosage of 2 ppm (mg/L) is required to treat the pool water. The calcium hypochlorite has 65% available chlorine. Determine the weight of chemical (solid form) needed.

 

Also a 5% concentration solution needs to be prepared. Find the volume of the diluted chlorine solution.

 

The hypochlorite chlorination calculations presented below are based on the pool volume of 260 m3.

 

 *** Chlorine (Cl2) dose requirement ***
Cl2 dose = 2 ppm

 

*** Chlorine (100% strength) needed ***
Pool volume = 260 m3
Cl2 dosage = 519.66 g

 

*** Hypochlorite (chemical) required ***
% available Cl2 in chemical used = 65 %
Hypochlorite required:
- solid form = 799.48 g
- liquid form = 0.8000 litre

 

*** Dilution of chemical concentration ***
Final diluted solution concentration = 5 %
Volume of diluted solution = 10.4000 litre
Water added = 9.6000 litre

 

 

 

how to size swimming pool heater ?

how to calculate evaporation loss...

Swimming pool water requires heating in two circumstances:

 

 

(1)  during the operation, the pool is losing heat as a result of evaporation, convection, radiation and conduction (See Example 3). The magnitude of the evaporation + convection losses usually exceeds 80% of the total heat losses.

 

(2) during the initial heat-up (See Example 4).

 

In designing a pool heater, the designers usually have to evaluate the heating requirements for these 2 circumstances to make a fairly accurate estimate of the heater capacity. An understanding of the various losses is important.

 

 

 

 Calculation Example 3: 

Pool heat losses . . .  

You are tasked to estimate the pool heat losses for a condominium lap pool (82 ft length x 33 ft width x 4 ft deep).

 

Given design conditions:

- Outdoor air conditions: 75 oF / 50% RH.

- Pool initial water temperature: 65 oF.

- Pool heated water temperature = 80 oF.

 

In doing the calculations, you have made the following assumptions:

a) wind speed = 7 mph.

b) conduction heat loss = 3% of total losses

c) ignore fresh water make-up heat loss.

 

Heat losses from a swimming pool are mainly attributed to the following four mechanisms:

 

- Evaporation from the pool surface.

- Convection from the pool surface.

- Radiation from the pool surface.

- Conduction through the pool walls.

 

Evaporation Loss:

The rate of evaporation is estimated from the following equation [ASHRAE 2011]:

 

Wp = [A(Pw-Pa)(0.089+0.0782V)]/Y

 

where

Wp = evaporation of water, kg/s

A = area of pool surface, m2

Pw = saturation vapour pressure at pool water temperature, kPa

Pa = saturation vapour pressure at ambient air dew point temperature, kPa

V = air velocity over water surface, m/s

Y = latent heat required to change water to vapour at surface water temperature, kJ/kg

 

The evaporation heat loss is then calculated as follows:

 

Qev = (Wp x Y) x F

 

where

Qev = evaporation heat loss, kW

F = activity factor

 

 

Convection Loss

The convection loss is calculated using the following equation [ASHRAE 2011]:

 

Qcv = A x hcv x (Tp - Ta)

 

where

Qcv = convection heat loss, W

A = area of pool surface, m2

hcv = convective heat transfer coefficient, W/(m2.K).

[If option for Fixed convective transfer coeff. is unchecked, hcv is computed as 1 + 0.3V btu/(h.ft2.oF) in the aPocketPool program; V in mph.]

Tp = pool temperature, oC

Ta = ambient temperature, oC

 

Radiation Loss

The radiation loss is calculated using the following equation [ASHRAE 2011]:

 

 

where

Qrd = radiation heat loss, W

A = area of pool surface, m2

Es = surface emittance.

[Es = 0.96 for water is used in the aPocketPool program.]

Tp = pool temperature, K

Tsky = apparent sky temperature, K

 

Tsky is estimated using the following equation [ASHRAE 2011]:

 

 

where

Esky = Sky emittance

Tdp = Ambient air dew point temperature, K

 

Note: For indoor pool, radiation heat loss is ignored in the aPocketPool program.

 

Conduction Loss

The conduction loss is small and can be ignored in general.

 

Note: allowance as percentage of total heat losses can be allowed for in the aPocketPool program.

 

 

Using the aPocketPool program, the heat losses calculated are presented below:

 

Mechanism 

Heat Loss

(BTU/hr) 

 %
 Evaporation374454.7  75.0 
 Convection41943.0 8.4 
 Radiation 67637.413.6 
 Conduction 14970.2 3.0
 Total499005.3   100
Saturation vapour pressure at pool water temp. (in.Hg) = 1.033
Saturation vapour pressure at air dew point temp. (in.Hg) = 0.439
Ambient air dew point (oF) = 55.2
Apparent sky temp. (oF) = 53.9
Convective heat transfer coeff. (btu/h.ft2.oF) = 3.1

Note that the above calculated results are the peak or design heat losses based on the design conditions.

 

 

 

 

 Calculation Example 4: 

Pool heat-up heating . . .  

If the owner wants to heat-up the pool in Example 3 in 24 hr, what is the pool heat-up heat required?

 

Before you determine the heat-up heat for the specific pool, the following operating conditions are noted:

a) Pool cover will be used during the initial heat-up period.

b) It is determined in Example 3 that evaporation, convection and radiation losses contribute 97% of the total losses. With pool cover, these losses and other minor losses such as conduction, etc. will be ignored.

 

The calculated heat-up heat required are presented below:

 

Pool volume = 80969 USgal
Initial pool water temp. = 65 oF
Desired pool water temp. = 80 oF
Temperature difference = 15.00 oF
Heat-up time = 24 hr
Heat-up rate = 0.62 oF/hr

 

Heat-up heat (output) = 423657 BTU/h

 

 

========================================

Need to calculate pipe pressure drop (head loss)?, see

 

Android's  multiple Pipes Pressure Drop

 

or Windows' easy Pipe Friction Loop


 

aPocketPool (Android)

Price: 
  at Android Market  

 

OS requirements: Android        

 

 

To Purchase & Download to your Android device:

 

 

 

at Android Market

   

For product enquiry, email me.

 

 

 

in SI and IP Units 

 Pool Filtration Calculation...1 

  

 

 

Pool Filtration Calculation...2

 

 

  aPocketPool Menu 

 

 

 Pool Area & Volume Calculation 

 

 

Pool Shape Selection

 

 

 

Filter Selection 

 

 

Hypo Chlorination Calculation...1

 

 

Hypo Chlorination Calculation...2

 

 

 

 

Pool Heat-Up Heat Calculation

 

 

Pool Heat Losses Calculation...1

 

 

 

Pool Heat Losses Calculation...2