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calculations

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. M

    Heating design calculations

    I have a large property with over 26 radiators that are all staying. The house is circa 1750 with very poor levels of insulation. The existing rads are totalling around 55kw based on modern rad charts but it is not known whether the rads (fitted around 1995) are dt20 or dt11. Questions : Do...
  2. Chalked

    USA Water usage calculations.

    local council planning officer is asking for a water usage calculation on a large house. 6 shower rooms, 2 bathrooms, 3 cloakrooms. 4 outside taps, 2 kitchens and 1 utility. Oh and a pool. Do they want peak usage, adding all outlets at once? There’s only 4 people live there! Do you know...
  3. D

    Consistent BTU calculations

    Hi, I am looking to get my radiators swapped out for modern designer radiators so am researching BTU values I'd need to achieve for each of the rooms. I live in a small ex council 2 bed, 2 floored maisonette on the top 2 floors of a 4 floored, mostly brick built block. I'm struggling to get...
  4. L

    BTU Calculations

    Hi everyone, can anyone recommend a good BTU app. Tried a few. Does anybody rate or recommend any perticular apps? Thanks again!
  5. L

    Gas safe entry

    Hi, Hoping that someone can offer me some advice on how to get gas safe qualified. Despite having no formal qualifications in plumbing, I am quite competent with all pipework skills and electrics. I work sometimes with a gas safe mate of mine on boiler replacements and pretty much know how to...
  6. S

    Calculations Help Required

    Hi Guys Im sorry to say I have strayed from the flock and have left the great profession of plumbing and am now running a company in the hire industry, its the same $h!t but a without a drain to pump it in to We have been asked to supply our existing LPG shower blocks for an indoor job in...
    • StuWalker
    • Thread
    • calculations cylinders help help required required valves water which
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
  7. 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...
  8. T

    Heat transfer calculations

    I am probably trying to be too clever but is there a quick way of calculating the heat transfer of underfloor heating from a alupert 16 mm pipe through a screed 65mm thick and ceramic tiles into the air in a room? I realise this involves the following 1) Pipe to Screed Conduction 2) Screed...
  9. R

    Space Heating Calculations - replacing electric storage heaters with central heating

    Hi there, I am needing to design a heating system to heat a flat that was converted from the upper half of a barn around 40years ago (downstairs is still used as a woodshed etc with no heating.) The wall construction is varied and unknown as the farm and building is centuries old, so...
    • Rayment84
    • Thread
    • calculations central central heating electric heaters heating replacing space storage storage heaters
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  10. M

    drainage calculations

    I have got to show calculations to prove the existing soil stacks on a job are capable of taking the waste we are putting into it. Can anyone point me in the right direction of how to do this, are there set values etc. Maximum pipe length for waste runs etc. I have never had to do this before...
  11. H

    Calculations

    How do you work out what size rad to fit for a given room and what factors to take into account?
  12. W

    Radiator size calculator easy calculations

    If you're looking for an easy rad size calculator. Here's to links which do the calculations for you. Hope this helps. Heated Chrome Towel Rails, Designer Radiators, Bathroom, Cast Iron, Electric, Traditional Or this: http://www.homesupply.co.uk/radiator...calculator.php
  13. S

    Calculations behind 2 storey limit on reducing size of stack ventilation pipes?

    Does anyone know the calculations behind the limit on reducing a stack ventilation pipe to 75 mm and to one and two storey buildings? We have an en suite to our 2nd floor loft conversion and I want to reduce the soil vent pipe down to 75 mm and run it to and out through the centre of the flat...
  14. B

    btu/heatloss calculations

    been asked to quote for a full fit on a new build its a cement outer skin on ply with rockwool in the middle does this get treated as a normal filled cavity?
  15. J

    Heat loss calculations

    Any experienced plumbers that understand heat loss and u values that could help me out.. I am trying to work out a heat loss calc on the kitchen, I have done the lounge which is 21 degrees and i understand that if the outside temprature is -1 degrees then it makes it 22 degrees...im total aware...
    • joe brown
    • Thread
    • calculations degree degrees heat heat loss kitchen living outside
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
  16. P

    Gas Pipe Sizing Calculations

    I need to add a cooker supply and have been trying to work out the sizing of the pipe but have come unstuck as can't see anything over 30 meters in 'THE' chart. Have checked Corgi, Viper and old text books with no luck. All lengths include allowance for pipe and fittings (copper). A-B = 7.5...
  17. D

    System planning

    Hi all just wondering how many of you guys plan and size pipe work and what methods you use to size pipe work. And is it essential to size pipe work for heating systems and extensions to hot and cold pipe work?
  18. B

    Checking my calculations for adding radiators

    Hi all, I've just bought a house (Horray!) and thought it would a be good opportunity to practise my plumbing skills. I'm hoping to add a few radiators as some rooms don't have any. I've got a Greenstar 24i junior from Worcester Bosch - It's got 24kw heat output if i've understood correctly...
  19. N

    MCS & heat pump heat loss calculations

    Looking through the guidance notes it seems you now have to provide the customer with a room by room heat loss calculation as part of the survey pack. How do the more experienced heat pump installers do this and how long does it take you? I'm looking at using the CIBSE domestic heating design...
  20. M

    radiator calculations

    hi, Can you please break down how to do rad calcs. I done them a few years back at college but paperwork is lost. i dont want to use one of the web sites as i need it to be accurate as poss. thanks
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