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differential

In mathematics, a differential equation is an equation that relates one or more functions and their derivatives. In applications, the functions generally represent physical quantities, the derivatives represent their rates of change, and the differential equation defines a relationship between the two. Such relations are common; therefore, differential equations play a prominent role in many disciplines including engineering, physics, economics, and biology.
Mainly the study of differential equations consists of the study of their solutions (the set of functions that satisfy each equation), and of the properties of their solutions. Only the simplest differential equations are solvable by explicit formulas; however, many properties of solutions of a given differential equation may be determined without computing them exactly.
Often when a closed-form expression for the solutions is not available, solutions may be approximated numerically using computers. The theory of dynamical systems puts emphasis on qualitative analysis of systems described by differential equations, while many numerical methods have been developed to determine solutions with a given degree of accuracy.

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  1. H

    Digitron APM140 Differential Manometer - Out of range issue

    Hi, I wonder if anyone here can help me in resolving this issue. The meter I have stops at 19mbar with 'out of range' message and I cannot use it for other pressure checks. The instruction manual is not helpful. I contacted Digitron but they are not replying. The meter range is upto 130mb...
  2. Robert Tyrrell

    Combi boiler temperature differential

    2 years ago I installed a Baxi 836 and every year the owners complain about the water temperature. Last year I couldn't find anything wrong but this year there's definitely a low-temperature hot water output. Although this is usually a warranty claim I'm having difficulty with this as I messed...
  3. BuilderDan

    Multiple differential bypass valves

    Is it ok to have more than one bypass valve on a system? Planning an UFH system (heat source supplied by air-water heat pump) with 2 manifolds, each with 6 circuits. Each manifold has its own motorized isolation valve connected to a room thermostat controller. Obviously the system needs a bypass...
  4. M

    Room thermostat: Myson MPRT differential

    I cant find any information about this room thermostat, I'm wondering if it can be changed because it seems to come back on when the temperature hasn't changed, example if I set it to 22c it will turn off off at 22.1c but then say 15 minutes later it will come back on when it's still saying...
  5. E

    U guage or Differential pressure guage

    Afternoon all happy Sundays to one and all. A quick question. I was thinking of buying a differential pressure guage does anyone use them for TT or are they not a worthwhile investment. Thanks Eddie
  6. M

    thermostat with a small differential + anticipator?

    Hello, I need some advice please. The central heating in our home oscillates the house temperature too much. It's specially uncomfortable at night, waking people up when the bedrooms become too hot. I've just done some Googling and I learned about thermostats with smaller differentials (some...
  7. jaydebruyne

    Differential Pressure

    So, on my Anton you can check differential pressure. Sorry to sound stupid but I am.. What is this test for? What pressure differences are you testing and from what boiler component? Cheers
  8. K

    Five degree differential btw CH outflow/return - condensing combi

    I recently had a Baxi Duotec 24 installed. The commissioning paperwork says that the central heating outflow is 70 degrees, return is 65 degrees (DHW at 55 degrees, if you're curious). It serves seven rads in six rooms, including one towel rail - all bar the towel rail have TRVs and all are...
  9. M

    baxi differential pressure valve

    I have got to swap a differential pressure valve on a main combi 24he. The part at the front with the flow switch bolted on. Its leaking from the spindle which makes the microswitch as usual. I normally just replace the diaphragm but my customer is insisting the whole lot is replaced for some...
  10. W

    Bristan mixer shower says max differential pressure 5:1

    Does that mean 0.2 and 1 bar will be fine yeah? (tank fed and main with a PRV fitted) Or does it mean it will work but not very well? And if not very well, what would be the problem? Thanks
  11. A

    Main Combi 30 HE DHW Pressure Differential Valve

    Hi, I've got a differential valve that isn't deflecting except when the hot water is fully on. It should be deflecting with much less flow. There is no problem with the hot or cold water flow. I've had the valve apart and everything is clean and free and the diaphragm is intact. The micro-bore...
  12. B

    Condensing boiler 20 degree differential

    Flow pipe temperature 70 degrees. Return pipe is 55 degrees. What would I need to do to get the 20 degree differential that they look for?! Turn down pump speed? Close off balancing valve on rads and cylinder until temperature on return pipe drops? Or is dere another trick?!
  13. J

    Heating design..

    What is the rule of thumb for sizing a low loss header, 2 pipe sizes above the main flow/returns? did have the book somewhere but can't find it, what maximum KW can 15, 22, 28, 35, 42mm copper tube carry? doing a fair size job at the mo and have done a first fix of each floor and know how we'r...
  14. Worcester

    Basic Boiler Control System with Elctronic stats

    I'm looking for a basic 'boiler' control system - simple nv contacts will do, operating on accurate electronic (pt1000 or siimilar) probes, not ya strap on themomechanical stats. It's to control a pump based on programmable variable high/low limits on a buffer tank, working on either one or two...
  15. T

    Some questions about balancing central heating

    Firstly hello this is my first post. The back ground: I recently bought an old house. The heating system was intact but the boiler wasn't working (heat exchanger leaking).The boiler was replaced with a straight replacement Ideal Condensing boiler. At that time there were no radiators on the...
  16. B

    fitting Baxi 80E/105E, DHW Pressure Differential Valve 248063

    will I have much water leaking when replacing this valve thanks. Bazzer
  17. L

    pressure differential diverter valve?

    Hi lads have just started doing a few breakdowns for my boss and would like to pose a question. I have just put an overhaul washer kit on a pressure differential diverter valve (front pin) on main combi 30 he I know how that part works.... venturi etc but what moves the second pin at the...
  18. M

    Baxi Combi Instant 105 HE hot water issue

    I have a problem with a Baxi Combi Instant 105 HE. Initially when i turned the hot tap on the boiler didn't do anything but when i pushed the micro-switch on the DHW pressure differential valve the boiler fired up and the water started coming out hot. So i replaced the Differential valve. Now...
  19. G

    Replace Hortsmann HRT3 with Honeywell DT90

    Hi, I'm looking for some advice on a replacement thermostat for the "Hortsmann HRT3". I finding that the thermostat is constantly clicking on and off. I seems like it has no tolerance for any change in temperature. So it will click in for about 5 minutes, which is barely enough time for the...
  20. B

    FOR SALE: Anton APM150 Differential Manometer

    The Anton APM 150 Differential Manometer is a durable pressure measurement instrument that offers straightforward, hand held pressure & tightness testing. It comes equipped with a sturdy protective boot with tilt stand and a backlit display to encourage use in both difficult and dark conditions...
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