New alternator keeps it cool, stays silent under pressure
24 July 2020 | Web Article Number: ME202019679
Nidec Leroy-Somer has launched an alternator designed for cogeneration applications in district heating.
According to the company, the new LSAH 44.3 incorporates an optimised heat recovery system directly connected to the heating circuit, enabling it to reach leading electrical and thermal efficiency values.
It has been designed to be packaged into small natural gas generator sets built for combined production of heat and electricity. The main application of these gensets are residential and public buildings central heating.
To maximize the heat recovery process, the LSAH 44.3 has been designed with a high-performance liquid cooling circuit that connects directly to the heating piping system. The LSAH 44.3 has also been optimized and qualified to operate at high temperature, with a maximum operating temperature set at 80° C.
The LSAH 44.3 delivers a rated power between 50 and 94 kVA at 50 Hz in continuous service (from 62 to 117 kVA at 60 Hz). The alternator is fitted as standard with an AREP excitation system and a D350 regulator. Paralleling with the public network for the resale of electricity production surplus is also possible.
“Thanks to its cooling and heat recovery system, the LSAH 44.3 offers top performance, especially in situations of intensive use. The electrical efficiency reaches 97% and generally remains above 95%. These high values allow optimized operation and quicker profitability,” the company said in a statement.
“Thanks to the optimized cooling system, the lifespan of the machine is increased and allows intensive operation of the system without any risk of failure due to hotspots.”
Water cooling also allows the use of the LSAH 44.3 in non-ventilated and silent generator sets, making their integration in buildings much easier without noise pollution for the neighbourhood.