Technical Data - gledhill TORRENT DIRECT Design, Installation & Servicing Instructions

TECHNICAL DATA

2.1 MODEL SELECTION GUIDE
The suggested model sizes shown in the table 2.1 are based on a typical daily hot water usage
and on the assumptions that the heating system is correctly sized and that the thermal store is
heated to at least 75
an increase of one model size should be considered.
When selecting a Torrent-RE model, the following operating and the compliance requirement
parameters should also be taken into account: -
(a) The primary heat source (e.g. a boiler) will only heat about 65% of the store volume and
the remainder is designed to be heated by the solar thermal system. During the winter
period the solar contribution will be negligible and this should be taken into account when
selecting the Torrent-RE models.
(b) The solar heating systems and the associated equipment should comply with the 'Building
Regulations' and these requirements are specified in the 'Heating system compliance
guide'. (See www.gledhill.net). The key requirements relevant to the model selection are: -
Either the total floor area, A
stated for the model in table 2.1 as illustrated by example 1 below; or the dedicated
solar volume for the model selected should not be less than the valve '25 x A
A , is the total net area of the solar panels in m
P
Example 1:
The total floor area, A
Therefore from table 2.1, the smallest Torrent model that will comply with the
requirements will be T350RE.
Example 2:
Total net are of the solar panels, A
Therefore dedicated solar volume required = 25 x A
Therefore from table 2.1, the smallest Torrent model that will comply with this
requirements will be T200RE.
The surface area of the solar heat exchanger of the Torrent-RE model selected should
not be less than the valve '0.1 x A
or less than the value '0.2 x A
where, A
P
Example 3:
The net area, A
The manufacturers recommended flow rate, Q
Therefore, minimum surface area of solar heat exchanger required = 2.5x0.1 = 0.25m
Example 4:
The net area, A
The manufacturers recommended flow rate, Q
Therefore, minimum surface area of solar heat exchanger required = 3.5 x 0.2 = 0.7m
o
C by the main heat source. It is recommended that for higher specification,
, of the dwelling should not be greater than the value
D
, of the dwelling = 130m
D
' for high flow rate solar panels (
P
, is the total net area of the solar panels in m
, of the solar panels = 2.5m
P
, of the solar panels = 3.5m
P
2
as illustrated by example 2 below.
2
.
, to be installed = 3.0m
P
= 25 x 3.0 = 75 litres
P
' for low flow rate solar panels ( < 0.5 l/min per m
P
2
.
2
,
, = 0.4 l/min per m
SP
2
,
, = 0.7 l/min per m
SP
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'; where,
P
2
.
0.5 l/min per m
2
2
2
)
2
);
2
2