Condenser, and centrifugal chiller equipped with the same

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.

1 . A condenser comprising:
 a shell container into which a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG is introduced;   a refrigerant inlet which is provided in an upper portion of the shell container;   a refrigerant outlet which is provided in a lower portion of the shell container;   a heat transfer pipe bundle in which a number of heat transfer pipes causing a cooling liquid to circulate therein are bundled and which extends inside the shell container;   an intra-heat transfer pipe bundle air bleeding pipe which is disposed in a central region of the heat transfer pipe bundle in a bundle diameter direction, which has a pipe shape parallel to an axial direction of the heat transfer pipe bundle, and in which a non-condensable gas air bleeding hole for performing air bleeding of a non-condensable gas mixed in the low pressure refrigerant is formed on a lower surface thereof; and   an air bleeding device which is connected to the intra-heat transfer pipe bundle air bleeding pipe and performs air bleeding of the non-condensable gas.   
     
     
         2 . The condenser according to  claim 1 , further comprising:
 an extra-heat transfer pipe bundle air bleeding pipe which is disposed in an upper space inside the shell container, in which a non-condensable gas air bleeding hole is formed on a lower surface thereof, and which is connected to the air bleeding device,   wherein the air bleeding device is capable of independently performing air bleeding of the non-condensable gas through each of the intra-heat transfer pipe bundle air bleeding pipe and the extra-heat transfer pipe bundle air bleeding pipe.   
     
     
         3 . The condenser according to  claim 1 ,
 wherein the shell container has a cylindrical shape extending in a horizontal direction,   wherein the heat transfer pipe bundle includes an outbound pipe bundle which extends from one end to the other end in a longitudinal direction inside the shell container, and an inbound pipe bundle which communicates with the outbound pipe bundle at the other end in the longitudinal direction inside the shell container and returns from the other end to the one end in the longitudinal direction inside the shell container,   wherein the outbound pipe bundle is disposed below and the inbound pipe bundle is disposed above inside the shell container, and   wherein the intra-heat transfer pipe bundle air bleeding pipe is disposed in a central region of the inbound pipe bundle in the bundle diameter direction.   
     
     
         4 . A centrifugal chiller comprising:
 a turbo compressor which compresses a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG;   the condenser according to  claim 1 , which condenses the compressed low pressure refrigerant;   an expansion valve which expands the condensed low pressure refrigerant; and   an evaporator which evaporates the expanded low pressure refrigerant.   
     
     
         5 . The condenser according to  claim 2 ,
 wherein the shell container has a cylindrical shape extending in a horizontal direction,   wherein the heat transfer pipe bundle includes an outbound pipe bundle which extends from one end to the other end in a longitudinal direction inside the shell container, and an inbound pipe bundle which communicates with the outbound pipe bundle at the other end in the longitudinal direction inside the shell container and returns from the other end to the one end in the longitudinal direction inside the shell container,   wherein the outbound pipe bundle is disposed below and the inbound pipe bundle is disposed above inside the shell container, and   wherein the intra-heat transfer pipe bundle air bleeding pipe is disposed in a central region of the inbound pipe bundle in the bundle diameter direction.   
     
     
         6 . A centrifugal chiller comprising:
 a turbo compressor which compresses a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG;   the condenser according to  claim 2 , which condenses the compressed low pressure refrigerant;   an expansion valve which expands the condensed low pressure refrigerant; and   an evaporator which evaporates the expanded low pressure refrigerant.   
     
     
         7 . A centrifugal chiller comprising:
 a turbo compressor which compresses a low pressure refrigerant used at a maximum pressure of less than 0.2 MPaG;   the condenser according to  claim 3 , which condenses the compressed low pressure refrigerant;   an expansion valve which expands the condensed low pressure refrigerant; and   an evaporator which evaporates the expanded low pressure refrigerant.