ISSN : 1738-4125(Print)
ISSN : 2287-7509(Online)
ISSN : 2287-7509(Online)
에어로졸 공정을 이용한 전열교환기의 은나노 입자 코팅 및 항균 능력과 열교환 성능 평가
Silver Nano Particle Coating of Enthalpy Exchanger by Aerosol Process and Evaluation of Antimicrobial and Heat Exchange Efficiencies
Abstract
In this study, an enthalpy exchanger was coated by silver nano particles via spark discharge method and itsantimicrobial and heat exchange efficiencies were evaluated. A method utilizing thermophoretic force was used toimprove coating efficiency. Four spark discharge systems were parallel connected and generated silver nanoaerosol particles (number concentration of 1.65×108 particles/cc, mode diameter of 31 nm). The coatingefficiency was evaluated according to various face velocities (V=0.25~1 m/s) and temperature gradients((Thot-Tcold)/Thot=0~0.09). The maximum coating efficiency was 90.8 % when the face velocity was 0.25 m/s andthe temperature gradient was 0.09 (Thot=30℃, Tcold=2℃). Silver nano particles were coated onto the enthalpyexchange element and two different coating amounts of silver nano particles (0.11 ㎍/cm3 , 0.22 ㎍/cm3 ) were tested.For evaluation of antimicrobial efficiency, the suspension test method with E. coli was used. After the suspensiontest method, CFU(colony forming unit)s of each test sample were counted and colony ratio was calculated. Thecolony ratio was decreased more quickly when the amount of coated silver particles was increased. When thecontact time between each sample and suspension was over 3 hours, antimicrobial efficiencies of coated sampleswere more over 99.9 % for both amount of silver nano particle(0.11 ㎍/cm3 , 0.22 ㎍/cm3 ). The coating of silver nanoparticles did not affect the heat exchange efficiency.
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