M&E

M&E

1. Heating

   • Radiators
     • key points
       • simple and compact
       • Occupants familiar with function
       • low maintianance
       • good temp control
       • range of styles = flexible to layouts
     • limitations
       • slow thermal response
       • heat output is convective
         • can lead to uneven temperature gradient in the space
       • furniture must be positioned sympathetically to avoiding obstructing the heat output
       • the combination of windows that can be opened and perimeter radiators can result in excessive heat loss if the windows are poor design
     • Used in naturally ventilated building
     • located around perimeter walls
       • offset cold down drafts from glazing and prevent condensation forming on glass
     • temperature control achieved through thermostatic radiator valves (TRVs)
       • individual and local control
     • two basic types
       • pressed steel panel
       • cast extruded type - normally alluminium
   • Convectors
     • Key points
       • quicker warm up times in comparison to radiators
       • fan convectors provide high heat output for the unit size
       • convection current by unit provides good air movement
       • fan convectors provide greatly enhanced heat output and air movement
       • the casing can reduce the risk of burning which can occur with radiators
     • Limitations
       • Dust/dirt collects in the casing which required periodic cleaning
       • trench convectors tend to accumulate dirt an the grille can become covered by furniture
       • fan convectors incorporate many components and lack the simplicity of radiators and natural convectors
       • require a power supply
     • Natural convectors
       • casing with top and bottom openings
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   • Radiant Heating
   • Warm air unit
   • boilers

2. Ventilation

3. Air-conditioning

   • introduction to Air con systems
   • Constant volume (CV)
   • Variable air volume (VAV)
   • Displacement ventilation
   • fan coils
   • chilled beams
   • chilled ceilings
   • Room-based heat pumps
   • split systems
   • Variable refrigerant flow systems (VRF)
   • Chillers, dry coolers and cooling towers

4. Controls