Importance

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Abstract

The present invention makes it possible in a centrifugal chiller utilizing a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG to effectively extract, in high concentration, non-condensible gas that has mixed into the low pressure refrigerant, and thus suppresses reductions in condensing efficiency. This condenser (3) is equipped with: a shell vessel (21) into which a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG is introduced; a refrigerant inlet (22) which is provided to the top portion of the shell vessel (21); a refrigerant outlet (23) which is provided to the bottom portion of the shell vessel (21); a heat transfer tube bundle (25) in which a plurality of heat transfer tubes (25a) circulating a chilled liquid in the interior thereof are bundled, and which extends along the interior of the shell vessel (21); a gas extraction tube (31) in the heat transfer tube bundle interior, the gas extraction tube being disposed in the center region in the radial direction of the heat transfer tube bundle (25), forming a tubular shape arranged parallel to the axial direction of the heat transfer tube bundle (25), and having formed in the bottom surface thereof non-condensible gas extraction holes (31a) for extracting non-condensible gas that has mixed into the low pressure refrigerant; and a gas extraction device (33) which is connected to the gas extraction tube (31) in the heat transfer tube bundle interior and extracts the non-condensible gas.

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First Claim