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Spartherm Mini H2O Manual

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2.10 INTEGRATION IN A HEATING SYSTEM
The H2O fireplace insert must only be installed in an overall system after
detailed planning of the overall heating system in accordance with the rel-
evant rules of technology and the safety standards. Proper configuration of
the pumps, fittings, pipeline, buffer tank and the safety components, such
as safety valve and expansion tank, is the responsibility of the planning
firm and/or of the executing installation company. Bear in mind that during
the combustion phase, extremely high water output of approx. 20 kW can
briefly occur. The heating installations must be configured accordingly,
among other things.
The following sample calculation can be helpful for dimensioning the buffer
tank:
For the Mini Z1 H2O:
The following assumptions have been made in this regard:
• Size of the buffer tank: 300 l (approx. 300 kg water)
• Water temperature in the buffer tank at the beginning: 30°C
• Water temperature in the buffer tank at the end: 60°C
• Temperature differential 30°C (corresponds to 30 K)
• No heat withdrawal from the buffer tank during heat-up through the Mini
Z1H2O and no heat losses of the system
Q = cp×m×∆t
Q = 4,187 kJ × 300kg×30K
kg×K
Q = 37683 kJ
This means: To heat up 300 litres of water in a buffer tank, from an assumed
30°C to 60°C, a theoretical heat quantity of 37,683 kJ (= 37,683 kWs) is
required (losses or heat withdrawals in the system have not been taken into
account). This heat quantity corresponds to approx. 10.5 kWh. However, with
an effective setup of the heating system, e.g. of a stratified buffer tank, the
heat utilisation can begin shortly after start of circulation in Mini Z1 H2O. In
this case, only the excess energy will be stored in the buffer tank, not the
energy required for heating.
At an average assumed power of approx. 9 kW of the H2O fireplace insert,
heat-up of the entire buffer tank takes just under 2 hours.
On extremely cold winter days, it is possible that the fireplace system may
also be in operation for approximately 12 hours. In this case, the thermal
energy thus produced is theoretically 66 kWh. This thermal energy would
then be sufficient to heat just under 1,900 litres of water (from 30°C to
60°C). As a rule, in such a situation heat is also continuously withdrawn so
that overloading of the buffer tank (> 90°C) should not occur.
The assumptions, values and results for the other fireplace inserts are spec-
ified in the table below.
… 27 …


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