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manifold

In mathematics, a manifold is a topological space that locally resembles Euclidean space near each point. More precisely, an n-dimensional manifold, or n-manifold for short, is a topological space with the property that each point has a neighborhood that is homeomorphic to an open subset of n-dimensional Euclidean space.
One-dimensional manifolds include lines and circles, but not figure eights. Two-dimensional manifolds are also called surfaces. Examples include the plane, the sphere, and the torus, and also the Klein bottle and real projective plane.
The concept of a manifold is central to many parts of geometry and modern mathematical physics because it allows complicated structures to be described in terms of well-understood topological properties of simpler spaces. Manifolds naturally arise as solution sets of systems of equations and as graphs of functions. The concept has applications in computer-graphics and augmented-reality given the need to associate pictures with coordinates (e.g. CT scans).
Manifolds can be equipped with additional structure. One important class of manifolds are differentiable manifolds; their differentiable structure allows calculus to be done. A Riemannian metric on a manifold allows distances and angles to be measured. Symplectic manifolds serve as the phase spaces in the Hamiltonian formalism of classical mechanics, while four-dimensional Lorentzian manifolds model spacetime in general relativity.
The study of manifolds requires working knowledge of calculus and topology.

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  1. G

    UFH manifold

    Can anybody tell me what make this manifold is?
    • gerardwrenn
    • Thread
    • america manifold ufh usa
    • Replies: 3
    • Forum: USA
  2. A

    Polypipe UFH manifold temperature conflicts

    Hi all. Hope all is well and safe. I need your advice please. I have a Valliant boiler serving the CH and DHW (megaflo). Just recently, we’ve had underfloor heating installed. Before the UFH was installed, the boiler flow temp was set at 65C (it could be adjusted to 75C) using the -/+ buttons...
    • Amarka
    • Thread
    • america manifold polypipe temperature ufh usa
    • Replies: 7
    • Forum: USA
  3. IanAitchi

    Strange UFH behaviour at manifold

    Hi, Hoping someone can comment on whether what I see happening at my UFH manifold is OK, or whether there is cause for concern. I'm not an expert on underfloor heating, Our system was fitted about 10 years ago and has worked flawlessly with zero issues all this time. As you can hopefully see...
  4. S

    Manifold noise

    Hi, We currently have a problem with our downstairs underfloor heating. The boiler appears to be working, and the radiators upstairs are emitting heat, but the downstairs underfloor heating is cold. The manifold under the stairs is producing a strange whirring noise from the grey metal...
  5. A

    Replacement manifold recommendation?

    Background story: About 18 years ago we refurbished 75% of our house and self-installed UHF in that part of the property with the help and advice of a good friend of mine (who is also a Gas Safe registered engineer). At the time we purchased a design and complete kit of parts from a young...
  6. H

    Odd fill / drain valve on manifold

    Hi there - I think I have an airlock in my UFH, and I need to flush the system to get it out. I've watched countless videos on how to do it which seems relatively straightforward, but what I can't figure out is the drain/return ports. They don't seem to have any valves to open/close them, which...
    • hobblewash
    • Thread
    • america drain manifold usa valve
    • Replies: 10
    • Forum: USA
  7. A

    Manifold hot cold plumbing

    Hello again. I'm moving forward with my new-build project on, I need to plumb my 3 wet rooms up stairs, a downstairs loo and kitchen/utility. Due to lack of availability of a decent local plumber I'm doing the work myself. I wanted to use manifolds for hot and cold supplies. 22mm to feed the...
    • Andy_S
    • Thread
    • america bathrooms cold cold water feeds hot manifold plumbing usa water
    • Replies: 4
    • Forum: USA
  8. H

    UFH Leaks 1 year after installation

    Hi - I little insight and guidance would be much appreciated. My wet UFH was installed over a year ago by a qualified heating engineer, he went through all stages and did the pressure test as well, everything has been working nicely without any issues. Now here is the unlucky coincidence - I had...
  9. A

    Underfloor heating - manifold valve leak

    My underfloor heating has sprung a leak where one of the pipes reaches the manifold. I have tried giving it a bit of a clean and tightening it, but to no avail. Every time I re-pressurise the system is goes again. Is it as simple as shutting off the water supply to the heating and replacing the...
    • andycollins1312
    • Thread
    • america central heating system heating leak manifold underfloor underfloor heating usa valve
    • Replies: 5
    • Forum: USA
  10. B

    URGENT Worcester 28CDi return manifold

    Does a Worcester 28CDi Combi have to be taken off the wall to change the plastic return manifold?
  11. N

    URGENT Leaking lpg continental rf6030 4 cylinder manifold

    Hi all, I have an lpg setup that was fitted November 2018. We have 4 x 47kg cylinders connected to a continental rf6030 auto changeover manifold. This evening I swapped over a pigtail on one of our reserve cylinders that had been damaged by a rat having a midnight feast on it. When I undid...
  12. PolypipeOverlay

    Pipes going in at angle into Underfloor Heating Manifold Problem?

    Is it acceptable to have plastic pipe going into the manifold at such angles as shown in photo? There is definitely stress on the fittings as the pipe is pulling hard to one side on numerous connections. The manifold does not leak under pressure test. Should it be kept as is if it does not leak...
    • PolypipeOverlay
    • Thread
    • america angle central heating system going heating manifold pipe pipes plastic pipe problem underfloor underfloor heating usa
    • Replies: 4
    • Forum: USA
  13. D

    DIY manifold with PEX and plumbing a bathroom

    Hello all, my wife and I have recently purchased a house in Edinburgh (move in date 6th dec hopefully) and I have been working hard to get a plan done for a diy manifold and I shall do a complete refit of the bathroom. I plan to do it all myself bar the electrics and boiler connections. The...
    • digspam
    • Thread
    • bathroom diy manifold pex plumbing
    • Replies: 4
    • Forum: Canada
  14. gingalig

    Uhf manifold,

    Hi thanks for any advice in advance, I've been asked to look at a leaking manifold the general condition of the valves/actuators is poor and it seems logical to replace the whole thing. My question is there any or many reasons they cant be fitted upside down ? I.e cold at the top hot at the...
  15. G

    Manifold question

    Hi all. I have a dodgy manifold and I need to replace it. my question is does water flow through the 22mm pipe where my finger is pointing or is there like a block inside the pipe to stop the flow and return mixing in the 22mm pipe? All help is appreciated
  16. S

    Underfloor heating pump and manifold choice

    Having a load of work done at the moment, part of which is to have wet UFH installed, just looking for any thoughts around the best system to use. There seems to be lots of choice, looking for 3/4 zone system. Any thoughts greatly appreciated.
  17. D

    Yorkshire peglar microbore manifold Wm18 22mm x 8mm

    I need to fit another rad and have spare outlets on the manifold. This manifold is now obsolete. Standard 8mm olives do not fit. I have found Legris brass compression olives at RS online which i would describe as a collared olive. Would these be suitable? Mytub.co.uk shows an illustration of the...
  18. C

    UFH Manifold Location

    Hey guys Where is the best place to have my manifold? I want 3 zones. The kitchen is 2.4 x 3.1 m The bathroom is 3.1 x 3.1 m (Directly above the kitchen) The conservatory is 2.1 x 3.1m (Directly next to the kitchen boiler wall) The kitchen is the natural choice as all 3 zones are nearby, and...
  19. D

    Emmeti manifold to new radiators.

    Hi I'm I've just joined and hope to gain some well needed knowledge! I'm replacing the old 1 pipe heating system in my house as its very old and full of leaks! We're putting down a solid wood floor so I don't want any joints under it that might fail! I'm thinking of using the Emmeti manifold...
  20. T

    UFH Manifold Banging

    Hi all, first post here so be gentle! We have recently installed UFH in around 60M2 of our house. It is a John Guest 3 port manifold assembly with 3 speed John Guest pump & Blending Valve. Each port has an electronic actuator head fitted. The boiler has recently moved into the loft and is a...
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