Switch to mobile site
Loading

Central Heating

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

Create an Article

Heat Emitters

Radiator Sizing

Click to show/hide index

Maintenance

Commissioning

Heating system water analysis

Servicing

Controls

Circulating Pump

Heating System Controls

Minimum Requirements

Room Thermostats

Regulations

Regulations

Heat Emitters

Heat Loss Calculation

Radiator Sizing

Types

Pipework

Fully Pumped Hot Water and Central Heating

Gravity Hot Water and Pumped Central Heating

Gravity System

Open-vented System

Pipework Sizing

Pipework Systems

Sealed Systems

System Layout

Underfloor Heating

Boilers

Boiler Sizing

Flue Types

Gas Boilers

Heat Pumps

Oil Fired Boilers

SEDBUK Rating

Solid Fuel Boilers

Formulas

  • The mean water temperature = (flow temp. + return temp.)/2
  • Temperature difference = Mean temp. - Room temp.
  • Overall correction factor = f1 x f2
  • Radiator size = total heat loss/overall correction factor
< Go Back2013-04-21

Radiation Correction Factor - F2

Top and bottom opposite-end connections 1.00
Bottom opposite-end connections with blind nipple 0.97
Bottom opposite-end connections 0.90
< Go Back2013-04-21

Temperature Difference Factor - F1

Temp. diff. °C f1 Temp. diff. °C f1
40 0.605 56 0.918
41 0.624 57 0.938
42 0.643 58 0.958
43 0.662 59 0.979
44 0.681 60 1.000
45 0.700 61 1.020
46 0.719 62 1.041
47 0.738 63 1.062
48 0.758 64 1.062
49 0.758 65 1.104
50 0.798 66 1.125
51 0.818 67 1.146
52 0.838 68 1.189
53 0.858 69 1.189
54 0.878 70 1.211
55 0.898 71 1.232
< Go Back2013-04-21