Hot water heating yesterday.... Hot water heating … and today n Principle –Heating system n Heat source n Distribution network n Heat emitter –Heat transfer.

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    14-Dec-2015

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Slide 1Hot water heating yesterday... Slide 2 Hot water heating and today n Principle Heating system n Heat source n Distribution network n Heat emitter Heat transfer medium n water n steam n air Slide 3 Hot-water heating n Terminology Boiler Radiator Main supply/return pipe Branch supply/return pipe Radiator valve Vent cock Drain/feed cock Shutoff valves Expansion tank Manual Control valve Radiator Slide 4 Heating system design Initial information about the building Type n industrial, office, dwelling Operation n continuous, intermittent n single, multiple Structure n heavy, light n new, reconstruction Slide 5 Heating system design Functional requirements n Connection of the heat emitters with the heat source n Deaeration n Draining n Integration into the building Slide 6 Heating system design Optimisation criterions Length of the pipes Location of the heat emmiters Control of the system Investment costs Operational costs Maintenance Slide 7 Design parameters of hot water heating systems (1)Water circulation (2) Geometry of the system (3) Water temperature (4) Expansion vessel (5)Materials Slide 8 Water circulation n Natural without pump P1=h. 1.g P2=h. 2.g P F =P n + P P n Forced with pump P n =P 2 -P 1 =h.( 2 - 1 ).g P2P2 P1P1 Slide 9 Geometry of the system n Relative connection of the heat emitters One-pipe, two-pipe n Main pipe lay-out Upper, lower, combined n Branch pipes lay-out vertical, horizontal, microbore Slide 10 Geometry of the system Relative connection of the heat emitters n Relative connection of the heat emitters Two-pipe system One-pipe system Slide 11 Two-pipe systems n Contraflow, parallel flow Tichelmann Slide 12 One-pipe systems Basic schemes of the connection WithWith mixing valve Two-point One-point With By-Pass With By-Pass Horse Rider Controlled by-pass SerialSerial Slide 13 One-pipe systems Mixing valves Two-point valves One-point valves Ventil compact Slide 14 On-pipe systems Horse -rider Low pressure radiator valves Slide 15 Relative connection of the heat emitters Conclusion Two-pipe X one-pipe system Length of the pipes Water circulation Measuring and control Pressures in the system Slide 16 Geometry of the system Main-pipe layout Upper Lower Combined Slide 17 Branch pipes lay-out Vertical Horizontal Hvzdicov Microbore

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