The best way to evaluate the efficiency of a heating system is to make a comparison with others heating systems using a suitable term of comparison. ENEA uses for example the specific heat consumption, i.e. the total heat consumption per unit of surface and per year. The formula is this: kWh / sqm / year.
Referring to the specific heat consumption, a heating system can be evaluated for efficiency according to a simple scheme of this type:
0 - 30 kWh / sqm / year excellent efficiency
31 - 50 kWh / sqm / year high efficiency
51 - 70 kWh / sqm / year good efficiency
71 - 120 kWh / sqm / year average efficiency
121 - 160 kWh / sqm / year unsatisfactory efficiency
161 - 200 kWh / sqm / year very low efficiency
> 200 kWh / sqm / year zero efficiency
The energy saving understood as a result ofenergy efficiency (same conditions consuming less) is not obtained by lowering the air temperature in the rooms (which can be positive if it does not decrease comfort), but by improving the efficiency of theheating system.
Given that a heating system it is made up of several elements including the type of fuel, the boiler, the distribution system, the radiators and the control system, its performance can be improved:
• optimizing the amount of hot water circulating in the system;
• increasing the temperature difference between the hot water at the outlet and the one entering the burner, that is, the temperature of the return flow-temperature.
Against a rational evaluation, the efficiency of a heating system can be improved (consequently reducing consumption) by intervening on the system components (from fuel to thermostatic valves), improving the management of the system (production, transmission and final use of heat), using a different type of system ( radiant panels, convector system, radiant floor panels).
With reference to living comfort, sometimes this can be achieved even without interventions on theheating system. For example, it may be more convenient to isolate the house from cold and heat or to adjust the humidity of the indoor air to the levels of correct thermohygrometric comfort.
If instead we refer to the total cost of the heating, in addition to the efficiency of the system, it is good to pay attention to the cost of the energy consumed, that is, the quality of the supply. Place that most of the heating systems it works with gas purchased from a network supplier, it is useful to identify the most convenient rate based on your consumption profile.
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