Get documents about "Heating and Hot Water Systems
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Electricity Tariff
Heating and Hot l select the local REC (unless a preferred
supplier is in place)
Water Systems l if not listed pick ‘Other (not listed)’
l select the appropriate tariff
1 2
Main and Secondary Main and Secondary
Heating Heating
l Main heating system
– the system supplying heat to most of the rooms l Ignore open fires upstairs when selecting the
and, preferably, providing hot water main or secondary heating system
– if in doubt choose the non-room heater system
– if in doubt choose the system heating the living
room
l Secondary system
– any other system that is installed (eg gas fire,
open fire etc)
3 4
Heating Fuel Main Heating Types
l Gas
– mains gas, bulk LPG, bottled lpg l Boiler system
l Oil l Warm air
– 35 second, 28 sec (kerosene) l Room heaters
l Solid fuel
– house coal, smokeless, anthracite, wood
l Storage heaters
l Electricity l Other system types
– on-peak, off-peak l Community heating
l Community heating
– with or without CHP (Combined Heat and
Power) 5 6
1
The majority of homes are
Heating Types heated with a boiler and
radiators
Other systems
15%
Other
Other ch systems
10%
63% Gas Blr+rads 30% Boiler and
Radiators
Elec ch 8%
70%
4%
Gas other ch
7
Source: 1991 English House Condition Survey 8
Main Heating Types
l Boiler and radiators
l Storage heaters
l Room heaters - gas, solid fuel
l Underfloor heating - wet or electric
l Warm air - gas, oil, electric
l Ceiling heating - electric
Boiler
9 10
Fully pumped system
c
‘Supercal’ ylinder
Cylinder Cylinder
Radiators
Radiators
Boiler Boiler
11 12
2
Fully pumped system
Fully pumped system
‘Supercal’ ylinder
c Fully pumped system
c
‘Supercal’ ylinder
Cylinder Cylinder
Radiators
Radiators Radiators
Radiators
Pump Pump
Boiler
13 14
stat.
Room stat.
stat.
Cylinder stat.
Zone
valves
TRVs
15 16
Two channel
programmer
Three port valve
17 18
3
What does the flue gas
contain ?
Boiler Efficiencies
What does the flue gas What does the flue gas
contain ? contain ?
What happens in a What happens in a
conventional boiler ? conventional boiler ?
" "
! !
Efficiency
!
!
$
#
!
! 7 / 10 = 70% $
#
4
SEASONAL BOILER EFFICIENCY BOILER EFFICIENCY
100 Condensing
DIRECTIVE
boilers
Efficiency based on gross CV (%)
90 l EC Boiler Efficiency Directive 92/42/EEC
80 High efficiency boilers
70
Conventional
boilers
60
Typical average
50 load over a season
50 100 25 26
Boiler load (%)
BOILER EFFICIENCY BOILER EFFICIENCY
DIRECTIVE DIRECTIVE
l EC Boiler Efficiency Directive 92/42/EEC l EC Boiler Efficiency Directive 92/42/EEC
implemented in the UK as implemented in the UK as
l Boiler (Efficiency) Regulations 1993 l Boiler (Efficiency) Regulations 1993
and amended by
l Boiler (Efficiency) (Amendment) Regulations
1994
27 28
BOILER EFFICIENCY BOILER EFFICIENCY
DIRECTIVE DIRECTIVE
l Introduction of higher efficiency standards l Part load efficiency must be within 3% of full
(e.g. 88% nett for a 100kW boiler) load efficiency
l Introduction of a 30% load test
l All boilers up to 400kW from 1st Jan 1998
l ‘Conventional’ boilers have effectively
disappeared
l High Efficiency boilers are now the minimum
standard 29 30
5
BOILER EFFICIENCY
SEDBUK
DIRECTIVE
l Seasonal Energy Efficiency of Domestic
l Part load efficiency must be within 3% of full
Boilers in the UK
load efficiency
l these are still ‘bench’ efficiencies (measured
by the manufacturer)
l eg 30% figure is arrived at by firing the boiler
and getting a temperature lift which is 30% of
maximum
31 32
SEDBUK SEDBUK
l Seasonal Energy Efficiency of Domestic l Classify the boiler
Boilers in the UK l Get the full load and 30% efficiencies
l Developed by boiler manufactures and l Convert to gross efficiencies
BRE to give a seasonal efficiency which l Calculate the seasonal efficiency
can be used with SAP
33 34
35 36
6
37 38
SEDBUK Efficiencies
SEDBUK Database
l NHER Builder will has the facility to
download the latest SEDBUK database
from the web
l SEDBUK is updated every month.
Assessors is responsible for ensuring
they are using the latest version
l The program will prompt you to
download the latest database
2002 Part L 39 40
Gas Boilers
l Enter detail of the boiler into boiler database
– manufacturer
– model name
– model number
l If no manufacturer enter generic details
– normal / combi / condensing / back boiler (serving
rads)
– open / balanced / fan flues
– floor or wall mounted
41 42
7
43 44
45 46
47 48
8
49 50
Gas Boilers
l Enter as much detail on the boiler as possible
– manufacturer
– model name
– model number
l Also record
– normal / combi / condensing / back boiler (serving
rads)
– open / balanced / fan flues
– floor or wall mounted
51 52
Other Wet Central Heating
it!
Systems
s
is
l LPG
tm
l Oil
l Coal
n’
l Electric
Do
53 54
9
Worcester Electric
Hoppermate Boiler
solid fuel boiler
55 56
Central Heating Controls
l Room Thermostats
l Programmer
l Thermostatic Radiator Valves
l Zone control
l Intelligent thermostats
l Time delay thermostats
l Cylinder Thermostat 57 58
59 60
10
61 62
63 64
65 66
11
67 68
Main Heating Types Storage Heaters
l Boiler and radiators l Old - large
l Storage heaters l New - slimline
l Room heaters - gas, solid fuel l Automatic - charge control
l Underfloor heating - wet or electric l Fan assisted
l Warm air - gas, oil, electric
l Ceiling heating - electric
69 70
71 72
12
Time switch
E7 DUAL
1234550 TARIFF 1234550 877080
ON PEAK METER OFF PEAK METER
8342110
FUSE
FUSE
Time / tele
CONTACTOR
switch
L L P P P C W S S S W L L P P P C W S S S W
73 74
ON & OFF PEAK OFF PEAK ONLY ON PEAK ONLY OFF PEAK ONLY
75 76
Fan assisted storage heater
On and off-peak supplies
Grille
77 78
13
79 80
Storage Heaters
Controls
l Manual
l Automatic charge control
– local to the heater
– central
81 82
Storage heaters with charge control
83 84
14
Main Heating Types
l Boiler and radiators
l Storage heaters
l Room heaters - gas, solid fuel
l Underfloor heating - wet or electric
l Warm air - gas, oil, electric
l Ceiling heating - electric
85 86
Gas Room Heaters
l Old
l Modern - post 1970
l Condensing - rare
l With back boiler not doing rads
87 88
89 90
15
Condensing
lfe gas fire
91 92
Solid Fuel Heaters
l Open fire or closed room heater
l With or without a back boiler
l NB the back boiler does not do rads
93 94
Main Heating Types
l Boiler and radiators
l Storage heaters
l Room heaters - gas, solid fuel
l Underfloor heating - wet or electric
l Warm air - gas, oil, electric
l Ceiling heating - electric
95 96
16
97 98
Main Heating Types
l Boiler and radiators
l Storage heaters
l Room heaters - gas, solid fuel
l Underfloor heating - wet or electric
l Warm air - gas, oil, electric
l Ceiling heating - electric
99 100
Main Heating Types
l Boiler and radiators
l Storage heaters
l Room heaters - gas, solid fuel
l Underfloor heating - wet or electric
l Warm air - gas, oil, electric
l Ceiling heating - electric
101 102
17
103 104
Secondary Heating Secondary Heating
l Gas flame effect in fireplace l Gas flame effect in fireplace
l Gas flame effect in front of fireplace l Gas flame effect in front of fireplace
l Other gas fires l Other gas fires
l Solid fuel open fire l Solid fuel open fire
l Solid fuel closed fire l Solid fuel closed fire
l Fixed electric heaters l Fixed electric heaters
105 106
Gas Flame Effect Fires
Flued Open to the chimney
107 108
18
Controls in Zone 2 Hot Water Systems
l Credit is given for systems which give l From boiler / main heating
good time and temperature control in l Dual immersion
zone 2 l Single immersion (on- or off-peak)
l How many storage radiators / rooms l Electric instantaneous
l How many TRVs l Gas instantaneous single point
l Gas instantaneous multi point
l Kitchen range
109 l Gas circulator 110
Cylinder Jacket Cylinder Size
l None l Normal (80 - 130 litre)
l Insulating jacket l Medium (130 - 170 litre)
l Spray foam l Large (more than 170 litre) E7 usually
Dual
Immersion
113 114
19
Single Immersion
l Do not count it if it is simply a back-up
for the central heating system
l Usually fed from the on-peak supply but
sometimes only has off-peak supply
which is difficult to spot
115 116
Gas
Hot Water Systems singlepoint
l From boiler / main heating
l Dual immersion
l Single immersion
l Single immersion (off-peak)
l Gas instantaneous single point
l Gas instantaneous multi point
l Kitchen range
l Gas circulator 117 118
Gas Kitchen
multipoint Range
serves more
than one tap
119 120
20
Gas
circulator Hot Water Systems
l From boiler / main heating
l Dual immersion
l Single immersion
l Single immersion (off-peak)
l Gas instantaneous single point
l Gas instantaneous multi point
l Kitchen range
121 l Gas circulator 122
Thermal
Store
BOILER
Combi with thermal store FLOW
TO RADIATORS
BOILER
RETURN
123 124
CPSU
Heating and Hot
Pic of cpsu Water Systems
The End
125 126
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