![]() ![]() Quality of combustion can be improved by design of combustion devices, such as burners and internal combustion engines. Incomplete combustion is much more common and will produce large amounts of byproducts, and in the case of burning fuel in automobiles, these byproducts can be quite unhealthy and damaging to the environment. When a hydrocarbon burns in air, the reaction will yield carbon dioxide, water, carbon monoxide, and various other compounds such as nitrogen oxides. The reactant will burn in oxygen, but will produce numerous products. ![]() In the large majority of the real world uses of combustion, the oxygen (O2) oxidant is obtained from the ambient air and the resultant flue gas from the combustion will contain nitrogen:ģ Incomplete Incomplete combustion happens when there isn't enought oxygen for combustion to occur completely. For example: A simpler example can be seen in the combustion of hydrogen and oxygen, which is a commonly used reaction in rocket engines: The result is simply water vapor. In a complete combustion reaction, a compound reacts with an oxidizing element, and the products are compounds of each element in the fuel with the oxidizing element. ![]() Combustion or burning is a complex sequence of chemical reactions between a fuel and an oxidant accompanied by the production of heat or both heat and light in the form of either a glow or flames. Besarnya kalor yang dilepaskan di kondensor adalah : qc = h3 – h4……………………….………( 3) Dimana : qc h3 h4 = Kalor yang dilepas di kondensor (kj/kg) = Entalpi refrigerant yang keluar dari kompresor (kj/kg) = Entalpi refrigerant cair jenuh (kj/kg) 4–1 Proses Ekspansi Tahap ini terjadi di katup ekspansi dimana refrigerant diturunkan tekanannya yang diikuti dengan turunnya temperatur isentalphi. ![]() Pada tahap ini terjadi perubahan fasa dari dari fasa uap superheat menjadi fasa cair jenuh, pada fasa cair jenuh ini tekanan dan temperaturnya masih tinggi. 3–4 Proses Kondensasi Tahap ini terjadi di dalam kondensor, dimana panas dari refrigerant yang berfasa uap dari kompresor dibuang ke lingkungan sehingga refrigerant tersebut mengalami kondensasi. 2 mº = Laju aliran massa refrigerant ( kg/s). ![]()
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