چكيده به لاتين
Due to importance of reducing electronic devices and heat exchangers volume in industry, different methods for increasing condensation on cooling surfaces and exchangers have been introduced.
Condensation on a solid surface can be divided into two categories: film-wise and drop-wise. In this thesis a condensation setup consisting a boiler, steam trap, 316L stainless steel condensation chamber, water cold heat exchanger, for PT100 temperature sensor and dimer has been designed and constructed. Two test surface one for drop-wise and another for film-wise condensation test has been designed. Whole of this setup has been insulated with polyurethane (K=0.02).
For investigating drop-wise condensation, three tests with different surface temperatures from 85 to 94°C were carried out.
Data extracted from these tests shows that drop-wise heat transfer coefficient is 2 time more than film-wise heat transfer coefficient. First a test fixture for condensation test has been constructed and then drop-wise condensation heat coefficient on a hydrophobic has been compared with a film-wise condensation heat coefficient. Results show that drop-wise condensation coefficient in constant conditions are 200% higher than film-wise.
The goal for this thesis is to experimental investigations on surface which resulted in test rig and performing required tests for investigations.
Keywords:
Condensation , Condensation setup , Drop-wise Condensation , Film-wise Condensation
