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calculation

A calculation is a deliberate process that transforms one or more inputs into one or more results. The term is used in a variety of senses, from the very definite arithmetical calculation of using an algorithm, to the vague heuristics of calculating a strategy in a competition, or calculating the chance of a successful relationship between two people.
For example, multiplying 7 by 6 is a simple algorithmic calculation. Estimating the fair price for financial instruments using the Black–Scholes model is a more complex algorithmic calculation.
Statistical estimations of the likely election results from opinion polls also involve algorithmic calculations, but produces ranges of possibilities rather than exact answers.
To calculate means to determine mathematically in the case of a number or amount, or in the case of an abstract problem to deduce the answer using logic, reason or common sense. The English word derives from the Latin calculus, which originally meant a small stone in the gall-bladder (from Latin calx). It also meant a pebble used for calculating, or a small stone used as a counter in an abacus (Latin abacus, Greek abax). The abacus was an instrument used by Greeks and Romans for arithmetic calculations, preceding the slide-rule and the electronic calculator, and consisted of perforated pebbles sliding on iron bars.

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  1. D

    BTU Calculation help please

    Hi all. I want to replace the rads in my front room and to get the right size I'm trying to calculate the BTUs but I'm having agro calculating so can someone who knows what they're doing help please. The room size is 7.6m long 4.0m wide 2.5m high window dimensions are 1420mm H x 820mm W...
  2. R

    Diversity Factor Calculation

    Could someone work out total KW input for the following applying the diversity factor. 36 KW combi 24 KW combi Cooker 12.9kw It would appear according to gas Safe that my original assessment was wrong that they had exceeded badge capacity of a U6 as I didn't apply diversity factor. Now the...
  3. M

    Drainage flow rate calculation

    I have been asked what the flow rate of the drainage is on a project we are doing of 23 flats. I’ve never had to do this before, can anyone advise on how this is done?
  4. I

    Gas volume calculation

    hey Guys I wonder if someone could help me out. I wanted to find out if I could work on this domestic installation. It’s a house with 2 boilers 24 kw each so 48 in total, the gas meter is a g10 which I believe can be used as domestic and commercial. The gas pipe is run in majority 28 mm at 12...
  5. O

    Radiator Output (BTU/KW) Calculation Help (bestheating.com)

    Hi, I am in the midst of choosing radiators for a new build. There are various calculator tools available online, giving quite a range in results on what I require for each room. The tools do not specify whether they are based on T30, T50 or whatever. I am considering the Milano Windsor range...
  6. S

    Water flow rate calculation - not enough water for 2 showers

    We live in a new build and have a 150l unvented tank attached to an Ideal Logic Heat H15. The house is 4 bed, approx 1500 sqft and has 3 toilets, 1 shower and 1 bath. We don't have excessively long showers, maybe 20 minutes in total for both of us. Sometimes we can get 2 showers but we rush...
  7. D

    Meter purge times calculation help

    Hi there, I am writing a free app which will give a guide as to the purge time required for a commercial gas meter. So I have determined the installation volume and the total purge volume but I'm looking on how to determine the purge time. From what I understand, I need to take the largest...
  8. G

    Chronos Gas Rate Calculation software is now free.

    Due to popular demand, we've created a free, ad-supported version of our Chronos Swiss Army Knife software. Carry out gas rate calculations, calculate BTU/Kwh for a room. Save your gas rate calculations for review later. This app used to cost £1.99, now we're giving it away for free. There's a...
  9. A

    Efficiency of boiler rating calculation

    i all hope someone can help I have an 150L hot water cylinder with an immersion element after 1 hour it has consumed 2.69kW of electric (im not too sure but I suspect the starting temperature was approx 42.9 degrees and reached 60 degrees). Now when I use my boiler i measure the water...
  10. kozak1968

    Whole house boiler calculation.

    There use to be a website which you just filled in the boxes and it worked out the boiler size for a property (IDHEE I think). Anyone know what happened to it?
  11. A

    Gas pipe size calculation

    Hi all! I am looking to see if anyone uses a good gas pipe size calculation app! I have been been plumbing and installing gas for over 12 years so obviously I know how to work it out long hand, I just want to see if any of these apps are worth the money to save myself time over the year! Thanks
  12. H

    Calculation help needed

    Hi... Wavin 22mm Hep20 coiled pipe..... flow 12.5 ltr/minute...(at nominal mains water pressure at inlet) What I need to know is the expected water pressure drop over 50 metres. Many thanks in anticipation ...Nick
  13. M

    Pipe and pump sizing

    Do people use apps for this or a book. I have the 2011 edition of the design guide and on page 64 it say ' to find the calculation for flow rates do the calculation on page 63 section 13.9'. In the book on 63 there is no calculation and section 13.9 is on page 65 or 66 so missing the...
  14. D

    Calculation of thermal output???

    I've just had an air to water heat pump installed at my house, and I wanted to get a rough idea of what it's performance is. Can anyone help with a reasonably simple way to calculate the real world COP as a cross-check against the manufacturers BS? I appreciate that COP is a crude measure...
  15. M

    Heat loss calculation in mansion..help!

    Hi, Doing a heat loss calculation in a 8 bedroom house in central London. Currently has a light commercial Keston C90, 80l expansion on heating and 2 x 200 - 300l indirect cylinders. Its a family house with 33 rads with a mixture of cast iron and single/double steel rads. Wanted to do an...
  16. P

    Warm air return air arrangement & calculation

    I have been asked to carry out landlords certs on a series of properties which all have warm air units. The landlord has only just purchased the properties and wants a thorough top to bottom of the systems. I have my warm air but havnt seen one for about 10 years (apart from in the acs centres...
  17. M

    Loading Unit Calculation

    Please anybody can tell me what is the meaning this " Sink, 20mm sep./mix tap " regarding to Loading unit Calculation. Reference: Plumbing Engineering Services Design Guide, Page 13
  18. S

    whole house calculation

    Hi guys, I am pricing for a large heating job and looking for some advice to aid my confusion!!. The new extension is considerably larger than the existing cottage, and materially very different, I intend to use the whole house calculation to size the boiler my head is swimming because the new...
  19. A

    Gas rate calculation

    Hi guys, can anyone tell me what the calculation is for gas rating an imperial meter? I know it's time one revolution, then is it x30 / 1066? thanks guys
  20. F

    Heat loss calculation software

    Hello, Can anyone recommend a heat loss calculation program / software
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