ICI Steel Boilers - Monolite Print E-mail

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MONOLITE Boiler

Condensing Boiler

ICI Monolite Boiler

High efficiency using boiler condensing technology

The MONOLITE has a very high efficiency (max. 109%) which places it at the peak of the classification according to European standards (Output Directive 92/42/EEC). The reasons for this high efficiency are:

  • Recovery of the latent heat by condensation of the water vapour
    present in the flue gases.
  • Extremely low flue temperature, equal to
    to that of the return water plus about 10°C.
  • Reduction to a minimum of heat loss through the boiler casing, as the boiler may
    operate regularly alternating total off-periods without limits, below the water temperature.

The AISI 316 Ti furnace and vertical flues are capable of resisting attacks from acidic condensation.

The boiler body is composed of two essential units: horizontal cylindrical furnace and vertical condensing section.
Horizontal cylindrical furnace.
The furnace is composed of a large cylinder of AISI 316 Ti (strongly alloyed steel rich in Chrome, Nickel and Titanium), capable of resisting the attacks from acid condensate. Owing to the low water temperature in the boiler and the particular shape of its inner surface, flue gases begin to condense in the furnace itself. The drops of water are then conveyed downwards along with the flue gas in special vertical flue ways that are connected perpendicularly to the furnace.

Internal View of ICI Monolite Boiler

ICI Monolite Performance Graph

Vertical Condensing Section.
The AISI 316 Ti vertical flues are characterized by tapered projecting parts obtained by moulding of the plate
The inner surface has a particular corrugated shape capable of transmitting both sensitive heat (due to the fall in the flue gas temperature) and latent heat (derived from flue gas condensation) to the water in the boiler.

The MONOLITE offers the possibility of working with mixed systems, that is at a low and medium temperature, without detracting from its efficiency; the boiler may in fact be connected to two circuits operating at different temperatures. There are two returns to the boiler:
1. low temperature (underfloor heating, radiators with a large surface areas, etc.);
2. medium/high temperature (hotwater cylinder. heated furnishing elements, ordinary radiators).
In periods when there is no request for heat, the boiler may be switched off completely, thus considerably reducing the losses due to the traditional maintenance of the set temperature.
In all system operating conditions including the most unfavourable (high temperature returns), the efficiency never falls below the threshold of 96%, therefore ensuring constant operating economy.

ICI Monolite Connection Diagram

ICI Monolite Perfomance Diagram Theoretically, each cubic metre of natural gas can generate 1,6 kg of water during combustion. In the condensate, nitric acid (strong acid) and carbonic acid (weak acid) contribute to lowering the pH value of the water to values ranging from 3,5 to 4,5. The acid condensate must be neutralised with calcium and magnesium salts, bringing the pH value to 7, and thus making it possible to discharge the condensate along with domestic waste waters according to the requirements of two pieces of legislation in force (not applicable in Great Britain).

In any case, it is advisable to take note that the waste waters are strongly alkaline, which are present in much greater quantities than the water produced by a condensation boiler (100 basic parts to 1 acid). So an excellent neutralisation of acid condensate is already naturally performed by domestic waste waters.
The MONOLITE is controlled with electronic optimisation to make maximum use of the advantages offered by low-temperature regulation. The system is able to make an adequate system flow temperature correspond to variable outdoor weather conditions: when outdoor temperatures are mild (at the beginning and end of the heating period) water temperatures will be lower. This produces two important results:

1. a considerable improvement of comfort in the home, avoiding annoying differences in temperature;
2. reduction of heat loss in the flue (cold and dehumidified gases) and minimum dispersions in the heating system.

ICI Monolite Wiring Diagram

Technical Data
 
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