Dry heat rejection technology by direct contact heat exchange for waste heat removal system

Jangsik Moon, Yong Hoon Jeong, Yacine Addad

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    Applying the direct contact heat transfer technology, dry cooled waste heat removal system for the nuclear power plants is designed. The steam after turbine is condensed by a heat exchanger submerged in a non-evaporative fluid pool, thus there is no material exchange between the steam after turbine and environment. The heated fluid is pumped to the spray at high level and emitted into the air and the cooled fluid during passing the air is returned to the fluid pool by gravity. The air circulates in a large cooling tower designed to generate sufficient driving pressure. The fluid is emitted by two different methods, which are direct contact heat transfer on falling droplets and falling films of the fluid, and the designs for increased surface area of the falling fluid and stable operation of the system are introduced and direct contact heat transfer on the falling fluid and pressure loss of the air flow are analyzed. The analysis results show that the falling films system has smaller cooling tower than the falling droplets system due to low falling velocity of the films and low relative velocity of the air, thus the falling films system is considered as competitive alternation of the traditional dry cooling systems.

    Original languageBritish English
    StatePublished - 2017
    Event17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2017 - Xi'an, Shaanxi, China
    Duration: 3 Sep 20178 Sep 2017

    Conference

    Conference17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2017
    Country/TerritoryChina
    CityXi'an, Shaanxi
    Period3/09/178/09/17

    Keywords

    • Direct contact heat exchange
    • Dry cooling
    • Falling droplets
    • Falling films

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