ENGINE POWER GENERATING DEVICE

PROBLEM TO BE SOLVED: To suppress fluctuations in intake air temperature of an engine even when an engine power generating device is used under the environment with drastic changes in air temperature through a year or in a day for example.SOLUTION: The engine power generating device includes: an engine 21; a generating device 38; a package compartment 2 that houses the engine and the generating device; a heat exchanger 5b and a radiator 10 in a circulation duct line 61; a temperature regulating valve 68 that regulates a flow of an engine cooling water to a bypass duct line 67; a cooling water temperature detecting body 86b that detects temperature Tw of the engine cooling water; a valve control device 81 that regulates an opening degree of the temperature regulating valve 68; and a blower fan 12 that supplies air to the package compartment 2. The radiator 10 exchanges heat between the air brought by the blower fan 12 and the engine cooling water. The temperature Tw of the engine cooling water to the radiator 10 is held to a set temperature To, and as a result, air temperature Tb after passing the radiator 10 is maintained in the range of a predetermined temperature.