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.

Description

TECHNICAL FIELD[0001]The present invention relates to a condenser gasifying a low pressure refrigerant, and a centrifugal chiller provided with the same.BACKGROUND ART[0002]For example, as a centrifugal chiller used as a heat source for district cooling and heating, a centrifugal chiller configured to include a turbo compressor that compresses a refrigerant, a condenser that condenses the compressed refrigerant, an expansion valve that expands the condensed refrigerant, and an evaporator that evaporates the expanded refrigerant is known.[0003]Generally, a condenser includes a shell container having a cylindrical shell shape extending in a horizontal direction, and a heat transfer pipe bundle is installed so as to penetrate the shell container in a longitudinal direction. The heat transfer pipe bundle is constituted of a number of heat transfer pipes which are bundled at narrow intervals and cause a cooling liquid such as water to circulate therein. The heat transfer pipe bundle is l...

AI Technical Summary

Benefits of technology

The condenser in this patent prevents a decrease in efficiency when using low pressure refrigerants in centrifugal chillers. It effectively removes air bubbles from the refrigerant and reduces the amount of non-condensable gas that negatively affects the refrigerant's performance.

Problems solved by technology

However, due to the characteristics of the low pressure refrigerants, when a suction force of the turbo compressor acts, there are cases where a part of the inside of a refrigerant passage may be under a negative pressure.

In this manner, the non-condensable gas which has been incorporated into the refrigerant passage stays in the condenser, causes deterioration in condensation efficiency, and impairs performance as a cold instrument.

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