Table 4 Standing energy losses
System ref Heat loss Energy loss
(1)
maximum daily
(W) (kWh)
D 150 100 2.40
D 210 113 2.71
(1) These figures relate to a 45°C differential between the stored water and
ambient temperature.
Design Data
4 General
4.1 The Kwikot Direct Unvented Hot Water
Storage System (see Figure 2) has been assessed
in accordance with MOAT No 38 : 1986. When
used in accordance with this Detail Sheet the
system will perform in a safe and satisfactory
manner.
4.2 The hot water system capacity should be
selected in accordance with the recommendations
of BS 6700 : 1997, to meet the demands
required from the installation.
4.3 The pressure and flow available from the
water mains should be obtained from the local
water undertaker or by testing existing supplies to
establish the likely performance of the system at
peak periods.
4.4 It is essential, for reasons of safety and
performance, that installation of the system is
undertaken only by a
competent person
working in
accordance with this Detail Sheet.
4.5 The data shown in Tables 3 and 4 represent
the analysis of tests carried out by the BBA.
5 Hot water storage and supply
Hot water storage
5.1 The capacities of the system range are
comparable with conventional systems (see
Table 1). When heated to 60°C the system can
supply 70% of the storage capacity at the mean
temperature given in Table 3.
Flow rates
5.2 The flow rates achieved at the hot water
draw-off point will depend on all the normal factors
including the layout of the pipework from the tap to
3
Figure 2 Schematic layout — direct
Table 3 Heating, re-heating and water draw-off temperature
ABCDEF
System Heat source Heat-up Percentage of the capacity Mean Reheating Upper Quantity
ref immersion time and amount drawn off within draw-off time immersion available
heater 10°C of set temperature temperature heat-up above
time 40°C
(kW) (minutes) (%) (litres) (°C) (minutes) (minutes) (litres)
D 150 3 187 90 135 60 152 54 51
D 210 3 250 93 195 60 177 60 56
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