ICONS
Domestic Hot Water production (D.H.W.)
Heating Water Production
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GUIDE WHEN CHOOSING A CALORIFIER
A calorifier is an indirect water heating appliance (i.e. one that features at least one heat
exchanger) which accumulates heat so as to handle consumption rates that may vary
greatly over a period of time, while also limiting the power used by the generators.
Cordivari offers a wide and varied range of calorifiers and buffers, to provide the most
suitable product to any need and also allow simultaneous use of more energy sources.
Calorifiers with traditional boilers:
These products are designed for use with
conventional boilers which use water as a
heating medium in a sealed or open expansion circuit. The heat exchangers are designed to handle high flow rates on the primary
side to ensure that the heat transfer will be
efficient while at the same time avoiding
excessively low return water temperatures.
Calorifiers with biomass boilers:
The selection of a calorifier while operating
in conjunction with a biomass boiler must
take account of fact that excessively low
return water temperatures could reduce the
lifespan of the boiler. In addition, a calorifier
with a larger accumulation volume than
normal will be more suitable as it will act
as a buffer which will be beneficial to the
biomass boiler.
Calorifiers with condensing boilers:
Condensing boilers are highly efficient
and ecologically friendly. They operate at
optimum performance when the flow water
temperature is limited which results in the
return water temperature being as low as
possible. This will ensure that the latent heat
is extracted out of the combustion products
which will
maximise the efficiency of the system.
Calorifiers with solar systems:
The heat exchange coil surface area is a
critical issue
when interfacing solar thermal systems with
calorifiers due to limited primary flow rates
and
temperatures. The calorifier must also be
capable of acting as a buffer to harness the
solar energy throughout daylight hours.
Calorifiers with heat pumps:
Calorifiers operating in conjunction with airto-water or water-to-water heat pumps must
have extremely oversized heat exchange
surface areas to ensure that heat exchange
will take place even when there is a limited
difference in temperature between the
primary circuit and secondary stored water.
This will maximise the COP (coefficiency of
performance) of the heat pump.
Calorifiers with steam boilers:
The use of saturated steam as a heating medium
to produce domestic hot water, although little
used in the housing sector, is a solution which is
still employed in industrial environments where
the steam is already in use for the manufacturing
process. Technically speaking, steam calorifiers are
charactorised by relatively small heat exchangers,
as on one hand the steam gives high heat exchange
coefficients and on the other hand the exchangers
usually operate with considerable differences in
temperature between the primary and secondary
circuits. The use of steam demands a more stringent
safety regeime than the use of low pressure hot
water systems as steam boilers, depending on
their capacity and design pressures, are classified
as higher risk and therefore must comply with the
European Pressure Equipment Directive.
Calorifiers operating with more than one
energy source:
The demand to heat a calorifier using more
than one energy source, while at the same
time keeping the various circuits separate,
has become much more common in recent
times with the advent of renewable
technologies which usually need to be
backed-up with conventional boilers. In
these cases, calorifiers with a number of
heat exchangers are used with the design
ensuring that excellent thermal stratification
will be achieved with minimal interference
between the various heat sources.
Calorifiers operating with renewable
energies
D.H.W. production system connected to
renewable energies, exploiting natural
resources coming from air, water and ground.
Domestic Hot Water
production (D.H.W.)
Calorifiers operating with electrical
power
Cordivari products designed for working with
electricity can be connected to A/C power
supply.
Combined with a renewable energy power
supply system (fotovoltaic, wind energy, and
so on), it allows to have an environmental
friendly system.
GUIDE WHEN CHOOSING STORAGE TANKS
A storage tank is a well insulated tank that is inserted in heating systems powered by a
biomass generator. It has the dual function of allowing the generator to operate in a regular
manner, restricting the number of stoppages, and of creating a thermal stabiliser for the
heating system, thus improving working comfort considerably.
Central heating systems with one or more boilers which are
plumbed together and do not generate domestic hot water.
Central heating systems with one or more boilers which are
plumbed together in conjunction with solar power which is
connected to either one or two coil type heat exchangers.
Domestic hot water is not generated in these tanks.
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Combined central heating system and domestic hot water
production with one or more boilers which are plumbed
together.
Cordivari offers a wide range of storage tanks, which include both standard versions and
a number of combined versions to be used as a single appliance, acting both as a storage
tank and to produce domestic hot water.
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Combined central heating system and domestic hot water
production with one or more boilers which are plumbed
together.
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Heating systems with one or more sources hydraulically
divided, with the exploitation of the solar power and
without DHW production.
These are heating systems powered by a biomass generator
or more generators that are hydraulically divided.
The preparation of the DHW is done without involving the
heating h