The Whats and Hows

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What is the in­verter tech­nol­ogy in air con­di­tion­ers?

The in­verter tech­nol­ogy (or DC in­verter) is the lat­est evo­lu­tion of tech­nol­ogy con­cern­ing the elec­tro­mo­tor of com­pres­sors. An in­verter is used to con­trol the speed of the com­pres­sor mo­tor, so as to con­tin­u­ously reg­u­late the tem­per­a­ture. The DC in­verter units have a vari­able-fre­quency drive that com­prises an ad­justable elec­tri­cal in­verter to con­trol the speed of the elec­tro­mo­tor, which means the com­pres­sor and the cool­ing/heat­ing out­put. The drive con­verts the in­com­ing AC cur­rent into DC and then through a mod­u­la­tion in an elec­tri­cal in­verter pro­duces the cur­rent of de­sired fre­quency. A mi­cro­con­troller can sam­ple each am­bi­ent air tem­per­a­ture and ac­cord­ingly ad­just the speed of the com­pres­sor.

How does an in­verter save en­ergy?

The in­verter tech­nol­ogy elim­i­nates wasted oper­a­tion in air con­di­tion­ers by ef­fi­ciently con­trol­ling mo­tor speed. In in­verter ACs, tem­per­a­ture is ad­justed by chang­ing mo­tor speed with­out turn­ing the mo­tor on and off. The mo­tor speed in non-in­verter ACs re­mains con­stant and tem­per­a­ture is ad­justed by turn­ing the mo­tor on and off, thereby con­sum­ing more en­ergy.

What is the ben­e­fit of in­verter tech­nol­ogy?

Ev­ery air con­di­tioner is de­signed for a max­i­mum peak load – for ex­am­ple, a 1.5 ton AC is de­signed for a cer­tain room size, a 1 ton AC for a dif­fer­ent size, and so on. But not all rooms are of same size. A reg­u­lar air con­di­tioner of 1.5 ton ca­pac­ity will al­ways run at peak power re­quire­ment when the com­pres­sor is run­ning. On the other hand, an air con­di­tioner with in­verter tech­nol­ogy will run con­tin­u­ously but will draw only that much power that is re­quired to keep the tem­per­a­ture stable at the level de­sired. It au­to­mat­i­cally ad­justs its ca­pac­ity based on the re­quire­ment of the room it is cool­ing, thereby draw­ing much less power and con­sum­ing lesser units of elec­tric­ity.

Are win­dow ACs with in­verter tech­nol­ogy avail­able in the mar­ket?

There is no win­dow AC with in­verter tech­nol­ogy.

Are there star rat­ings for in­verter ACs?

Bureau of En­ergy Ef­fi­ciency (BEE) has es­tab­lished a new star rat­ing stan­dard for in­verter tech­nol­ogy ACs. Most of the in­verter AC mod­els are in 3, 4 and 5 stars rat­ing range of BEE. The star rat­ings for en­ergy la­belling be­came manda­tory for in­verter ACs in Jan­uary 2018.

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