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manifolds

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

    Initial fill of UFH circuits

    HI, we have replaced 3 manifolds (1 upstairs 2 downstairs) with new Warmup units. The installation manual from Warmup states that to fill the system you have to fill each circuit in turn using the fill / drain points on each manifold. However, my plumber said that he always uses the filling loop...
  2. E

    Replacing old microbore manifolds

    Hi, Have a couple of old microbore 28mm to 10mm manifolds for the central heating. Not sure of the condition on the inside of them but outside there's a fair bit of corrosion at the solder/compression joints. There not leaking so was wondering if they can be cleaned or if it's better to...
  3. J

    Wet/electric ufh and radiator manifolds) in Southeast London

    As part of deep house renovation, planning to install wet ufh on the ground floor, and radiators on upper floor. Two bathrooms will have both water based towel warmers and electric ufh, and need dual thermostat to separately control air temp (by running towel warmer) and floor temp. Need...
  4. J

    UFH vs radiators manifolds

    I am doing heavy house renovation and want to have ufh (multizone) at the ground floor and radiators on upper floors. I want to have consistent controls, with manifolds feeding both the ufh loops and radiators, and the same type thermostats controlling both (depending on the room, the...
  5. Ian Howe

    Cold rad and manifolds

    Narrowed down a cold rad to this manifold, are they prone to blocking or is it more likely the microbore?
  6. jakehowl

    Converting My House To Manifolds. Feedback Appreciated

    I'm sold on the idea of sanitary manifolds. I'm an avid and capable DIYer but finding the information out there on domestic manifolds systems lacking to say the least. Here's a diagram for my proposed approach to converting my house over from your usual 15mm pipe with T junctions everywhere...
  7. R

    Under floor heating manifolds

    I wonder if anyone can help me. My house has under floor heating but after having a new boiler fitted it doesn't seem to working as it should do. I wanted to get the system balanced but some of the flow meters are stuck and not all of the actuator/flow valves seem to be moving as they should. I...
  8. A

    Rehau manifolds installed backward

    Had a contractor come out today for in-floor heat not working. I have 2 zones each with Rehau manifolds supplied from a single pump and neither zone worked. Contractor felt the pump had failed and replaced it only to discover that the system still did not work. After much consideration...
  9. Y

    Two seperate manifolds on two floors

    Hi I installed ufh on two floors. My question is can I run two manifolds on two floors with one pump and mixing shunt? How do I go about connecting the manifolds together, do I run a T straight after the pump before it enters the first manifold or do I connect the second manifold after it...
  10. king of pipes

    Need to source some valved domestic brass manifolds .

    As above need make up 2 - 12way valved manifolds for a project but its proving expensive anyone know of a supplier ? Regards kop.
  11. M

    Indentify heating manifolds

    Hi guys, need help in identifying a manifold if possible, if not could you point me in the right direction to the closest thing available, pipeworks all 8mm and its quite tight so dont want to spend forever repiping it all, no markings on the manifold at all. Thanks in advance
  12. J

    Plumber(s) required for 3 house new build

    Looking for competent plumbers to price and work with the design of water/gas/waste plumbing for a terrace of 3 houses in Surrey. UFH manifolds and pipework will be installed by others - feeds to manifolds part of the job though. 3 kitchens 3 cloakrooms 8 bathrooms 3 utilities Gas central...
  13. C

    Myson actuators fit wundafloor manifolds

    Hi does anyone know if the two makes are interchangeable? im keen to go with mysons stats etc but need to know whether I have to use their actuators for ufh manifold thanks
  14. B

    Pin leaks under actuator

    Hi, we moved into a house with a 3 years old underfloor system. I notice a small leak coming from the pin (sitting in manifold under actuator). I think the leak stops once the actuator is removed and taken off the pin. I suppose I will need a new pin unit but as a similar leak seem to be...
  15. B

    Not all Radiators getting hot !!

    Hi, Some of my radiators are not getting hot at all or some are just hot at the top and from one side. System Description. - Downstairs mostly Wet Under Floor Heating. 14 Flow Circuits, with 8 Room Stats / Zones - WORKING OK 1 Towel Rad fed from upstairs - Upstairs - Radiator based, single...
  16. SMB

    Problems with manifold.

    Hi, I am slowly refurbishing my mothers old house for us to move in. Fitting a new CH system. (All gas work and boiler installation is being done by a local firm). The problem I have is with the CH manifold. Where I am joining the manifolds together they leak, a small drip now and then. I...
  17. G

    central heating design

    Hello, I am renovating my 3 bedroom house and currently dealing with central heating. I got a plumbing 'expert' who designed a central heating for the house: It is all on hep2o with 22mm manifolds. From there 10mm pipes goes to every room. It looks like this...
  18. G

    hep20 help needed.

    is anyone experienced with hep20 plastic 22x10mm 4port manifolds.they differ from the other fittings (bends ts etc)slightly, are the10mm ports demountable.ive tried and had no joy.help!
  19. M

    10mm plastic pipe for boiler

    Why is it every plumber you speak to gives you a different view of what the best way of doing something is? First there was the argument about copper v plastic. Now its 15mm or 10mm plastic. So I had a guy in today to quote on a new boiler. He was really good and suggested I go for 10mm pipe...
  20. M

    Soil manifolds

    Im doing a job where we have installed manifold soil fittings at the base of a some soil stacks at floor level. This is so we can easily discharge the shower wastes into it (there are 5 showers). The link below is the sort of thing that has been fitted. Waste Manifold Black SP588 | Black Pipe...
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