Enormously large amount of heat produced by human activities is now mostly wasted into the environment without use. To realize a sustainable society, it is important to develop practical solutions for waste heat recovery. Here, we demonstrate that a tubular thermoelectric device made of tilted multilayer of Bi(0.5)Sb(1.5)Te3/Ni provides a promising solution. The Bi(0.5)Sb(1.5)Te3/Ni tube allows...

In This paper uses an Attractive-Repulsive Particle Swarm Optimization (ARPSO) method for determining the optimal parameters of proportional-integral-derivative (PID) controller for temperature control of a shell and tube heat exchanger. Most of the heat exchange process is characteristic of nonlinear, large time delay and time varying. For such process it is very difficult to tune its controll...

Shell and Helical Tube Exchanger merupakan salah satu alat penukar kalor dengan memanfaatkan 2 pipa yaitu bagian luar dan dalam (Helical tube). Fluida panas mengalir pada dalam, fluida pendingin berlawanan arah (Shell), sehingga terjadi proses yang di dari dipindahkan ke dingin mengalir. Proses ini berjalan terus menerus. Penelitian bertujuan untuk mengetahui kinerja shell helical tube heat exc...

Application of nanofluid and coiled tubes are two passive methods for increasing the heat transfer. In the present study, the turbulent flows of water and nanofluid in coiled tubes heat exchanger were numerically studied. CuO-water nanofluid containing 1 vol% copper oxide nanoparticles was used and single-phase approach was considered for nanofluid flow. The effect of different geometrical para...

Fin tube heat exchangers are used in many heating and cooling devices for the purpose of transfer from one element to other by conduction convection. Due their designs fin also provide a control space or volume carrying out chemical reactions extracting surrounding liberating while undergoing an endothermic exothermic reaction respectively. The Thermally Activated Cooling (TAC) system developed...

In the design of heat exchangers, it is necessary to determine the heat transfer rate between hot and cold fluids in order to calculate the overall heat transfer coefficient and the heat exchanger efficiency. Heat transfer rate can be determined by inverse methods. In this study, the unknown space-time dependent heat flux imposed on the wall of a heat exchanger internal tube is estimated by app...

Abstract. This paper presents results of an experimental study on heat exchanger consisting of finned tube.The presented method for determining the local heat transfer coefficient on external tube surfaces is characterized by very high accuracy and can be applied to determine the spatial heat transfer distribution on objects with a complex shape. As a results of experimental and numerical inves...

Ionanofluids are a new and innovative class of heat transfer fluids which exhibit fascinating thermophysical properties compared to their base ionic liquids. This paper deals with the findings of thermal conductivity and specific heat capacity of ionanofluids as a function of a temperature and concentration of nanotubes. Simulation results using ionanofluids as coolants in heat exchanger are al...