Superconducting high-field magnets working in He II are usually immersed a pressurized static bath. This bath is then connected through heat exchanger to saturated acting as cold source. Due the peculiar properties (very high conductivity), conventional designs not suitable here. Additionally, compact design often mandatory, space inside cryostats always an issue. In recent paper [1], we presen...

This paper uses second-order software for evaluating five Stirling engine parameter?s effect on its performance to select an appropriate configuration with optimal dimensions use in a concentrated solar power plant. Appropriate configuration, heater shape, bundle tube heat exchanger size, and regenerator type geometry are studied. Results show that Alpha is the most suitable high-temperature di...

The results of a comprehensive study on the charging and discharging latent heat storage systems (LHSS) are presented. Multi-tube shell-and-tube units with variable layouts tube bundles examined. Two arrangements—in-line staggered—are tested. A number tubes different positions in bundle investigated. Moreover, two pitch ratios studied. Three commercially available substances used as phase chang...

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...

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...

Natural convection heat transfer was investigated experimentally in a concentric-cylinders annulus. To enhance the rate of heat transfer, pin fins were installed on the surface of the inner cylinder. Two fin arrangements were employed, namely, staggered and in-line arrangements. The length of the fins varied from 2 to 8 cm and the Rayleigh number Ra changed in the range from 5 x 105  to 5 x 106...

fridges are used in various industries, and heat exchanger is one of the main components of these systems; therefore, efficiency analysis of these systems is very important. in many fridges, frost over the heat exchanger tubes or pipes affects the system operation and reduces heat transfer between the refrigerant and ambient, so defrosting systems are usually used to enhance heat transfer. desi...