The following graphs show that copper-aluminium REGULUS-system radiators assume their heating function extremely quickly as compared to cast iron and steel radiators. Their distinctive features include small water capacity and low weight, deciding about their high controllability. With a small initial energy expenditure, Regulus radiators reach their full nominal power, proper to the temperature set.
To reach the operative system temperature of 75º/65ºC REGULUS-system radiator warms up using five times less energy in comparison to a steel radiator and with eleven times less energy compared to cast iron radiator. This situation has a significant impact on global energy consumption of the heating system, which, after all, consists of a set of radiators.
Derivative of the characteristics of the expenditure of energy required to heat the radiator is the following simulation:
This simulation shows a very low inertia of REGULUS-system radiators. It shows that the time needed to reach the operative temperature range of 75º/65ºC for the REGULUS-system radiator is about 5 minutes, while the steel radiator warms up after about 25 minutes, and cast iron radiator only after about 55 minutes. Very long warm-up time of a radiator negatively affect thermal comfort. These warm-up times were calculated assuming a nominal flow of 140 kg/h, and the temperature difference between supply and return at 10 K