Delphi code for water from air.

I have finished a Delphi computer program that will tell people if water will condense out of the air when the air is cooled. One could use wind power. Anyone or any institution may use it in any legal context. It also tells how much water will condense out and it tells one how much heat (in kJ and kWh) must be extracted from the air and so one can get an idea of the power requirements.
One could use an air conditioning unit to cool the air to the best temperature and there are do-it-yourself (DIY) sites that tell one how to do this -see https://www.instructables.com/id/DIY-Atmospheric-Water-Generator/
 Inputs are T1 (temperature of atmospheric air in deg C before cooling), RH1 (relative humidity in % of atmospheric air before cooling), P1 (atmospheric pressure in kPa which is assumed to remain the same during cooling), T2 (temperature in deg C to which air will be cooled), V1 (the volume in cubic metres  of air at T1 and RH1 and P1 that is to be cooled).
Note: It is a convention to say "enthalpy per kg of dry air," meaning the enthalpy related to the kg of dry air and the water vapour associated with that kg of dry air.
See code below:

label 1;

var

EnthV1MWh,EnthV1kWh,EnthV1,NokgdaV1,Enthd,Psatw1,Psatw2,Tk1,Tk2,Mvpa1,Enth1,Enth2,Ma1,Mv1,HR1,HR2,

Pv1,PV2,T1,RH1,P1,P2,T2,V1,kgDryAir,EdpkgDA,EnthDV,HR1mHR2,HR1mHR2V,kgpkWh,Td,RH,Psat,Pv,Tdew:extended;

errors1:boolean;

calcstr2,calcstr1,calcstr3,calcstr4,calcstr5,calcstr6,calcstr7,

calcstr8,calcstr9,calcstr10,calcstr11,calcstr12,calcstr13,calcstr14,

calcstr15,calcstr16,calcstr17,calcstr18:string[30];

begin

errors1:=false;

form2.hide;

form2.show;

try

T1:=strtofloat(form2.edit1.Text);

RH1:=strtofloat(form2.edit2.Text);

P1:=strtofloat(form2.edit3.Text);

T2:=strtofloat(form2.edit4.Text);

V1:=strtofloat(form2.edit5.Text);

except

errors1:=true;

end;

if (errors1=true) or

(T1<0.1) or (T1>100) or (RH1<0.1) or (RH1>99) or (P1<50) or (P1>150) or (T2<0.1) or

(T2>100) or (V1<0) or (T2>=T1)

then begin

form2.canvas.textout(0,100,'CHECK ENTRIES.');

goto 1

end;

Tk1:=T1+273.15;

Tk2:=T2+273.15;

Td:=T1;

RH:=RH1;

Psat:=0.61121*exp((18.678-Td/234.5)*Td/(257.14+Td));

Pv:=(RH/100)*Psat;

Tdew:=Td;

repeat

Tdew:=Tdew-0.001;

Psat:=0.61121*exp((18.678-Tdew/234.5)*Tdew/(257.14+Tdew));

until (Psat<=Pv);

str(Tdew:12:2,calcstr18);

Psatw1:=0.61121*exp((18.678-T1/234.5)*T1/(257.14+T1));

Pv1:=Psatw1*RH1/100;

HR1:=0.622*Pv1/(P1-Pv1);

Ma1:=(P1-Pv1)/(0.287*Tk1);

Enth1:=(1.005*T1)+HR1*(2501.3+1.88*T1);

Psatw2:=0.61121*exp((18.678-T2/234.5)*T2/(257.14+T2));

HR2:=Hr1;

P2:=P1;

if (Psatw2<PV1) then begin

Pv2:=Psatw2;

HR2:=0.622*Pv2/(P2-Pv2);

form2.canvas.textout(0,90,'Water condenses out. Dew point is:'+calcstr18+' deg C');

end;

Enth2:=(1.005*T2)+HR2*(2501.3+1.88*T2);

kgDryAir:=V1*Ma1;

EdpkgDA:=(Enth2-Enth1);

EnthDV:=kgDryAir*EdpkgDA;

HR1mHR2:=HR1-HR2;

HR1mHR2V:=kgDryAir*HR1mHR2;

kgpkWh:=(-1)*HR1mHR2V/(EnthDV/3600);

str(Enth1:13:4,calcstr1);

str(Enth2:13:4,calcstr2);

str(EdpkgDA:13:6,calcstr3);

str(Ma1:13:4,calcstr4);

str(kgDryAir,calcstr5);

str(EnthDV,calcstr6);

str((EnthDV/3600),calcstr7);

str((EnthDV/3600000),calcstr8);

str((HR1mHR2*1000):13:4,calcstr9);

str(HR1mHR2V,calcstr10);

str((HR1*1000):13:4,calcstr11);

str((HR2*1000):13:4,calcstr12);

str(EnthV1MWh,calcstr16);

str(kgpkWh:13:4,calcstr17);

form2.canvas.textout(0,120,'Enthalpy1 per kg dry air is: '+calcstr1+' kJ/kg dry air.');

form2.canvas.textout(0,150,'Enthalpy2 per kg dry air is: '+calcstr2+' kJ/kg dry air.');

form2.canvas.textout(0,180,'Enthalpy difference per kg dry air is: '+calcstr3+' kJ/kg dry air.');

form2.canvas.textout(0,210,'Mass of DRY air in one cubic metre of original air is: '+calcstr4+' kg.');

form2.canvas.textout(0,240,'Number of kg of dry air in V1 is: '+calcstr5+' kg.');

form2.canvas.textout(0,270,'FOR VOLUME V1: Heat added to volume V1 of air (Enthalpy difference for volume V1) is: '+calcstr6+' kJ.');

form2.canvas.textout(0,300,'FOR VOLUME V1: Heat added to volume V1 of air is: '+calcstr7+' kWh.');

form2.canvas.textout(0,330,'FOR VOLUME V1: Heat added to volume V1 of air is: '+calcstr8+' MWh.');

form2.canvas.textout(0,370,'HR1 - HR2 g/kg is: '+calcstr9+' grams of water vapour per kg dry air (CONDENSES OUT).');

form2.canvas.textout(0,400,'(HR1 - HR2 kg/kg)x(number of kg dry air in volume V1) is: '+calcstr10+' kg of water (CONDENSES OUT).');

form2.canvas.textout(0,440,'HR1 is: '+calcstr11+' g/kg.');

form2.canvas.textout(0,470,'HR2 is: '+calcstr12+' g/kg.');

form2.canvas.textout(0,520,'SUMMARY. Total mass of water condensing out of the air is: '+calcstr10+' kg.');

form2.canvas.textout(0,550,'SUMMARY: Total heat added to the air is: '+calcstr7+' kWh.');

form2.canvas.textout(0,580,'SUMMARY: kg of water produced per kWh of heat removed from air: '+calcstr17+' kg/kWh.');

form2.canvas.textout(0,610,'SUMMARY: Dew point temperature is: '+calcstr18+' deg C.');

1: end;