A typical solar domestic water heating system suffers from low energy efficiency due to multiple heat transfer process among components, i.e., the thermal collector and storage. In this work, a compact design of storage-integrated its compatible phase change material (PCM) storage were explored. The salt hydrate based composite PCM, sodium acetate trihydrate (SAT), was used create shape stabili...

For the purpose of thermal and hydraulic aerodynamic testing heat exchanger tube bundles, various full-scale specimens with different finning ratio have been proposed. Formulas that allow to evaluate effect exchanging on efficiency are presented.

This paper investigates the enhancement of heat transfer coefficient and Nusselt number of a nanofluid containing nanoparticles (γ-AL2O3) with a particle size of 20 nm and volume fraction of 0.1%-0.3% (V/V). Effects of temperature and concentration of nanoparticles on Nusselt number changes and heat transfer coefficient in a double pipe heat exchanger with counter turbulent flow are investigate...

The ground heat exchanger plays a major role in the thermal performance and economic optimization of ground-coupled pump. present study focuses on effect borehole size grout soil properties assessment these exchangers. A double U-tube was studied numerically by COMSOL Multiphysics 5.4 software 3-dimensional discretization model. circuited as parallel flow arrangement situated configuration (PFP...

Common approaches to the simulation of Borehole Heat Exchangers (BHEs) assume heat transfer in circulating fluid and grout to be in a quasi-steady state and ignore fluctuations in fluid temperature due to transport of the fluid around the U-tube loop. Such effects have been shown to have an impact on peak temperatures and hence operation of heat pumps systems when short time scales are consider...

in this article the effect of fouling on tube side and the overall performance of preheat exchangers of crude distillation unit of petroleum refinery have been investigated. for this purpose the experimental data of australian light crude oil in surface temperature of 200-260oc and the velocity between 0.25 to 0.4 m/s have been used. first, an overall dirty heat transfer coefficient was calcula...

One way to increase the heat transfer is to use perforated twisted tapes with different hole diameters, which largely improve heat transfer with an increase in the heat transfer area at the constant volume and more mixed flow. In the previous studies, the effect of nanofluids with perforated twisted tapes is less studied. In this work, the performance of water / iron oxide nanofluid in a double...