heating

Heating, ventilation and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers).
HVAC is an important part of residential structures such as single family homes, apartment buildings, hotels and senior living facilities, medium to large industrial and office buildings such as skyscrapers and hospitals, onboard vessels, and in marine environments, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors.
Ventilating or ventilation (the V in HVAC) is the process of exchanging or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air.
Ventilation includes both the exchange of air to the outside as well as circulation of air within the building. It is one of the most important factors for maintaining acceptable indoor air quality in buildings. Methods for ventilating a building may be divided into mechanical/forced and natural types.

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  1. Y

    Best Place For Posting Heating Engineer/Plumber Requests

    Hi I am new to this forum. I'm looking to see if someone could point me in the direct to post Best Place For Heating Engineer/Plumber Requests.
  2. R

    Glow worm not heating rads

    Hi chaps, hope you can help I have a Glow worm Ultracom 38cxi, HW is fine but CH is not working I turned it on last week and all went well but I struggled to turn it off so I just shut down everything, it appeared to be back to normal, all lights on, all controls OK, water heats ok, today I...
  3. Gordon

    Oil Central Heating Quote

    Plumber has quoted me £9,000 to install 1300Lt Oil Tank, Grant 36e External Combi Boiler, 5 small radiators and 2 large radiators. No VAT. Plus another £100 to sign off. Electrician quoted £370 to supply Nest Thermostat and conect to boiler. Builder wants £500 to lay the slab for the oil tank...
  4. P

    When is Central Heating Pump supposed to be on?

    Hello! Let me start by saying that I am no plumber and I am looking for advice as a flat tenant. I have set Central Heating on the programmer to come on at 5:00 am and turn off at 7:00 am each morning. Heating works fine during the programmed hours, but I noticed that the Central Heating pump...
  5. E

    Ideal Logic 30+ combi boiler - no heating

    Hi all, Looking for some advice as to why my central heating is not working. We have recently moved 2 radiators, replacing one with a new one. When turning the boiler back on there is now no heating. We have hot water, we have checked the pressure, bled the radiators, reset the boiler. We do...
  6. R

    Drain down central heating and refill with radiators off

    Hi, I have probably done a silly thing here so need some advice. I drained down the central heating system with a hose pipe from the drain off on the radiator closest to the door. No problems. Then I removed 3 radiators as we had the decorators in for a few weeks. As the decorators...
  7. R

    Radiators heating up on DHW setting

    Since replacing the expansion vessel on our Viessman 333 gas boiler, we've experienced a major problem. When we want hot water only,(DHW) setting, the radiators are being activated! Obvious solution may be with the 3 way port, but the complete heating system is now automatically switching itself...
  8. K

    Central heating not firing up is controller at fault r

    Renewed room thermostat and 3 port valve(drayton MA1) but hot water fires up OK but not central heating unless I turn off hot water timer settings on drayton lp522 controller?
  9. T

    Heating in flat issue

    I live in a 2 bedroom flat. The kitchen and lounge are one room. I have a combination boiler for water and central heating. There are standard radiators in all rooms that have TRVs except the lounge/kitchen area, this has 2 smaller radiators with no TRV. The thermostat is on the wall in the...
  10. 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...
  11. W

    installing plastic pipe central heating in bungalow

    just bought a bungalow which as 11 rads which i plan to replace and reinstall them with plastic pipe in the brick walls etc the property is 19 meters long and 7 meters wide the boiler is situated in the middle of the property and the boiler is a greenstar 28i junior 2014 model. question is i...
  12. CorgiDirect

    3 Great Autumn Offers for Heating Engineers

    Choose from free gifts with testo flue gas analyser kits or special pricing on the testo 868 thermal imaging camera To mark the start of Autumn and a busy heating season, CORGI direct are excited to bring you 3 great promotions that offer heating engineers even better value All promotions...
  13. D

    Riello RDB Boiler not firing for heating only

    The boiler is working fine for hot water but not for heating. Timer is on 24 hours and the thermostat 'clicks'. Any suggestions appreciated
  14. M

    Worcester Greenstar Junior 28i combi boiler - no green light or heating

    Hi all, First of all, I hope I have posted this in the correct place (apologies if not). I haven't used my boiler throughout the summer and have gone to turn the heating on. The hot water is fine and no problems but the green light does not come on my boiler and there is no heat. The blue...
  15. S

    Central heating only working when releasing water?

    Hi, The Boiler is a vortex combi 21 oil fed The central heating will only work manually if you drain water from the system (I’ve been using a valve near the front door with a hose to outside) while simultaneously filling from the boiler. Interestingly it will stay working once it’s manually been...
  16. D

    Danfoss fp975 heating trouble

    Hello, We've moved into a house which uses the above system which has duel control for heating and hot water. The hot water worked when we arrived and the heating was off. Now that's it's getting cold I got around to setting the heating up. The time on the unit was wing so I followed the...
  17. R

    Central heating - timer fault or something else?

    Noticed that when we turn the heating on manually we would then notice it had gone back off again so set to continuous and saw this video has sound Does this look like a faulty timer or something else tripping it? Thanks
  18. D

    central heating problem

    burner heating water but not rads any ideas
  19. P

    Hot water not getting into heating system

    Hello, I am look some advice. Our boiler heats the water for the radiators, but the hot water only makes it as far as this component ( pump is above it). It has a temperature sensor in it reading air temperature in the void, but I think it must have a cross over in it from the central heating...
  20. P

    Anyone know who makes this thermostatic shower valve?

    Has no manufacturer markings at all. Thanks.
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