
       LARTEC11.COM

 Program written in TURBOPASCAL for DOS-operating system.
 Programmer: Stig Larsson

 Purpose: Forecasting net revenue to customers solar system before they
 actually purchased the system. 
 Installation of solar heat system type "LARTEC".

 Preset: The solar collector is tested at an authorized solar collector 
 testing facility, such as The Swedish Testing and Research center at 
 Boras Sweden.
 This is needed to get reliable values of absorption, heat losses and 
 efficiency. Eta0, K0 and K1.
 All values are in: meters, Celsius degrees, litres, tonnes(2000 pounds), 
 kiloWatthours (kWh).

 You may need to know the 24-hour heat energy consumption while the outdoor 
 temperature is zero C degree flat (freezing point).
 It is good for comparision if you know the annual energy need for an average
 year of your house. (Measured in kWh (kiloWatthours).
 1000 litres of oil (250 gallon) equals almost 10,000 kWh.
 1000 m3 (cubicmeters) of nature gas 10,800 kWh.
 1 ton of Gasol  12,800 kWh.

 START the program LARTEC11.COM
 If you are not doing it already, you can read all manuals thru
 44=HELP AND USER MANUAL

 You will need two supplementary files

 File nr 1:         your_name.din          where 
 your_name = free name whith DOS-limitations ie max 8 characters 
 identification of your output. The extension is taken care of by the program.
 .DIN abbreviates  "data input"  and holds all data about the heating system.

 File nr 2:         Wheather.win 
 .WIN abbreviates "weather input" and holds sunny condition, medium temperature
 daytime and night time for every day of the year.
 It also concist of the year and site of origin.

 The weather can only show bright sky or clowdy, so there will be a slight 
 deviation from the real weather, which may include cumulus clowdy or foggy 
 (or smoggy).

 I have been updating the program a few weeks now, but there may be some
 bugs left, as my imagination isnt wide enough to figure out what may happen.
 If you will experience a bug, pleese notify me of the nature of it.
 Ctrl-C will abort program.

 NOW A SHORT STEP BY STEP INSTRUCTION
 Start "LARTEC11.COM"
 "Solpara.din" and "Weather.win" is default values, and pops up every program
 start. 
 99 is default at menu manouvers.
 A brief menu will appear, where you have two choices:

 **** Choose a file among  "Available"  then go direct to
 2=Simulation.
 
 **** Create or modify the file "your_name.din"  (before Simulation).
 Choose 66. and start whith the filename. No special-characters (follow DOS).

 Now choose 1= DATA INPUT.

 The page concist of all the data of your house and heating system, as well
 as the solar system.
 Fill up with valid data.

 22=  Start with a map, and find out your site latitud. It doesnt matter 
 whether you live on the north or south heimsphere, it will be 0 - 90 degrees 
 anyway.
 The sun walks around the globe in equal patterns at the same latitudes.
 
 23=  Fill in the accumulator data. You can only use square shaped design, ie 
 if you intend to use a cylindric container, you have to recalculate the depth, 
 width and height to the correct volume. This may give incorrect accumulaor 
 heat loss, but has no significance.

 About the lambda (insulation capacity):
 Gullfiber, Rockwool mm = 0,04 - 0,05 ( W/m3 x degree )
 Cellular plastic younger than 5 years  = 0,03
 Cellular plastic older than 5 years = 0,04 - 0,05

 24=  Ambient temp = The temperature in the hold(compartement) of the
 accumulator.
 Mintemp store = This means the lowest temperature you ever will have in the
 acc, or the thermostat meter at your electrical boiler, or oil combustion
 equippment.

 27= Enter data from your solar collector, or choose from "sample of items".
 What is  Eta0,   k0,   k1 ?
 Eta0: is the solar collector maximal efficiency.  Pout/Pin  %.
 k0:   is the solar collector specific heat loss coefficient.  W/m2*C
 k1:   is the second order heat loss coefficient.  W/m2*C*C
 These figures must be acheved from an acredited solar collector testing
 facility.
 28=  Use a compass and calculate the solar collector deviation from south,
 (or north if your location is at the south heimsphere).
 Use a sixtant or equivalent and calculate the minor angle (0 - 90) degrees
 between the earth and the solar collector.
 29=  From the point of solar collector, look for shadowing during the day and
 type the hours. (only full hours is relevant)

 30=  Estimate the angle from earth to the horizon at south and type in.
 This will mask out shadowing mountains if there is any.

 32= Are you going to use an external or internal heat exchanger? The
 difference is that
 ext heat exch allows heat to reach directly to the top of the acc, and hence
 gives faster shower water.
 33= Are you using the acc solely for preheating, and hence no other source of 
 heating will be used to the acc?
 34= Fresh hot water need (shower and cleaning) normally 5000 kWh/year.

 31= Is the solar system gonna heat only shower water? 
 If so, skip the questions no: 25, 35, 36, 37.

 25= Heating/day * = The full around-the-clock heat energy consumption (kWh) 
 when outdoor temp equals zero C degree flat. (Freezing point. important)
 flow valve temp* at zero deg outdoor temp = what temperature do you need at 
 your heat radiant element when the outdoor temperature is 0 C degrees to 
 maintain acceptable indoor temperature. (not important)

 35= Annual energy consumption in kWh (average year) (only for comparision)
 36= Do you use an automatic flow valve regulator whith an outdoor temperature 
 sensor? If you don't know, use "1=MAN".
 37= Insulation. Leave it at 17 deg for the time being.

 These values, together with annual energy consumption reflects the house 
 insulation status, and also the heat dissipation capacity of the radiant 
 elements.
 (In Sweden a common value is 25 - 50 kWh, and 30 - 40 C degrees).

 88= save "your_name.din".  Now you will create the datafile just typed in.

 This brings you back to the first menu, where you can start the simulation.

 Here you can choose different weather conditions by 
 65=WEATHERFILE, or go to
 55=WEATHER and swap filename.

 2= SIMULATION.
 This page is a very messy picture, despite my cleaning efforts. Whats left was 
 nessesary for the calculation of our customer service.
 The file "your_name.din" and "weather.win" is now loaded in the program.

 2 = RUN  For one complete year simulation just type 2, or else typ in start 
 and stop data.

 2 = RUN  For automatic run thru the year.
 or
 1 = STEP  For hour by hour monitoring thru the simulation, but you dont need 
 to repeatly type 1, just press "Return key".

 The automatic run may be halted whith "1" and stepped thru "step" anywhere.
 Restart by typing 2 = RUN again.
 You can end simulation any time, when you are in the RUN-mode, by Q=quit.

 99 = When the simulation is finished.

 4 = VIEW SUMMARY  to view the content of the file "yourname.txt" 
 or you may view or print whith any text editor such as, Word, Wordpad, 
 Notepad aso.

 The weather program is described separatly.

 The house power need and the outdoor temp is a farily linear relation except
 that it is disturbed from windy conditions, sun radiation, inhabitant
 behavior and so on. In a short term (days), the wall material may store
 sufficiant energy to pass the nights.
 The sun radiation is most significant thow. The sun radiation is sufficiant
 for all heating round the year in the tropic areas, and more or less in other
 parts of the world.


 Good luck

 Stig Larsson
