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REPUBLIC OF SERBIA MINISTRY OF DEFENCE
MINISTRY OF DEFENCE Material Resources Sector Defensive Technologies Department
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RESEARCH AND TESTING OF NOVEL SOLID-LIQUID PHASE CHANGE COMPOUNDS FOR THE MILITARY MICROCLIMATE COOLING SYSTEMS
DALIBOR JOVANOVIĆ, Technical Test Center, Belgrade, Serbia, jovcadach@hotmail.com PREDRAG STOJISAVLJEVIĆ, Technical Test Center, Belgrade, Serbia, pstojis@yahoo.com LJUBIŠA TOMIĆ, Technical Test Center, Belgrade, Serbia, ljubisa.tomic@gmail.com RADOVAN KARKALIĆ, Military Academy, Belgrade, Serbia, rkarkalic@yahoo.com ALEKSANDAR NIKOLIĆ, Faculty of Chemistry, Belgrade, Serbia, asn@chem.bg.ac.rs VESELIN MASLAK, Faculty of Chemistry, Belgrade, Serbia, vmaslak@chem.bg.ac.rs
Abstract: Phase Change Materials (PCM) absorb energy during the heating process and release energy to the environment in the phase change range during a reverse cooling proces. Personal body cooling is one of the several potentialy areas in which the phase change method of heat storage can be aplied. This paper presents results from the joint research activities conducted in the Technical Testing Centre and Faculty of chemistry in Belgrade related to chemical analysys of two commercially available PCM: n-hexadecane and inorganic salts mixture. Functionality of the chemicals was tested in the Military Medical Academy where both PCM compounds integrated in different types of cooling garments (InORG, OrgT and OrgO). Experiments comprised testing of the cooling garment efficiency on soldier’s physiological performance during exertional heat stress in hot environment. Physiological strain was determined by body core temperature (Tty) and mean skin temperature (Tsk). Study results indicate direct influence of the used PCM type physical and thermodynamic properties (melting temperature and latent heat of fusion) on the personal cooling system functionality and cooling intensity. Key words: phase change, heat, temperature, cooling, physiology, hexadecane, hydrated salts.
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