Gas engines (GE) are characterized by high electrical efficiency of about 45% compared to other combustion engines that assists their widened applications in integrated energy plants (IEP) for combined electricity, heat and refrigeration. Furthermore, their manufacture as cogenerative modules. With heat exchanges for removing the heat reveals prosperous opportunity for transforming the heat into refrigeration. Operation of IEPs in trigeneration mode ensures about twice increase of their total efficiency against cogenerative one due to enlarged operation time not limited by seasonal heat needs. However, the highest thermal efficiency of IEP takes place when heat transformed matches the heat released from engine. This is practically impossible if the heat is transformed into refrigeration by the most efficient and widespread absorption lithium-bromide chillers (ACh) because their heat consumption is limited by consumed hot water temperature drop by about 15 ℃. The unconsumed heat might be transformed by the simplest and cheapest ejector chiller (ECh) but with less COP from 0.2 to 0.35 against 0.7 to 0.8 for ACh. The novel system of GE intake air conditioning with liquid refrigerant recirculation in air cooler by injector to intensify the heat transfer and increase the COP of ECh and refrigeration accordingly which enables cooling intake air to lower temperature with enhancing engine fuel efficiency as result was developed basing on the proposed principle of incomplete evaporation. Such system might be applied in many energy systems including air conditioning with vapour compression electrically driven refrigeration machines.