wˌɛn kˈʌpəld wɪððə kˈɑːɹnɑːt ɪfˈɪʃənsi fɔːɹ hˈiːt kənvˈɜːʒən, ðɪ ˌoʊvɚɹˈɔːl ˈɛnɚdʒi kənvˈɜːʒən ɪfˈɪʃənsi ʌv ɐpɹˈɑːksɪmətli twˈɛnti fˈaɪv pɚsˈɛnt.
When coupled with the Carnot efficiency for heat conversion, the overall energy conversion efficiency of approximately 25%.