Patent ID: 7652748

Claim:
An exposure apparatus for exposing a substrate through a reticle, said apparatus comprising: a chamber in which an exposure process is to be carried out; a circulation system configured to circulate, within said exposure apparatus, a gas through said chamber; a supplying system configured to supply water, supplied from a facility, to a heat source inside said exposure apparatus; a heat exchanger configured to perform heat exchange between a gas discharged out of said chamber by said circulation system and the water supplied to the heat source by said supplying system; a temperature sensor for measuring a temperature of the water, at a position downstream of said heat exchanger and upstream of the heat source, with respect to the flow of water of said supplying system, wherein said circulation system includes (i) a first path that extends through said heat exchanger, (ii) a second path that bypasses said heat exchanger, and (iii) a valve mechanism configured to adjust a flow amount of the gas passing through the first path; and a controller for controlling said valve mechanism on the basis of a measurement made by said temperature sensor.