Coil Wound Heat Exchanger

A heat exchanger is a device used to heat transfer between two or more fluids for various application including power plants, nuclear reactors, refrigeration & air condition system, automotive industries, heat recovery system, chemical processing and food industries. The various types of heat transfer enhancement techniques are classified into two main categories. Active techniques which require external power for heat transfer augmentation, and passive techniques which not require such external power for enhancement. One of the passive techniques is the use of helically coiled tubes. Several papers studied and indicated that helical coiled tubes are superior to straight tube due to their compactness and increased heat transfer coefficient .Helical coils are used for various processes such as heat exchangers because they can accommodate a large heat transfer area in a small space, with high heat transfer coefficient. The centrifugal forces are acting on the moving fluid due to the curvature of the tube results in the development.

Helical tubes are universally used in chemical reactors, ocean engineering, heat exchangers, piping system and many other engineering applications. It has been long recognized that heat transfer characteristic of helical tubes is much better than the straight ones because of the occurrence of secondary fluid flow in planes normal to the main flow inside the helical structure .Helical tubes show great performance in heat transfer enhancement, while the uniform curvature of spiral structure is inconvenient in pipe installation in heat exchangers. It has been widely reported in literature that heat transfer rates in helical coils are higher as compared to those in straight tubes. Due to the compact structure and high heat transfer coefficient, helical coil heat exchangers find extensive use in industrial applications such as power generation, nuclear industry, process plants, heat recovery systems, refrigeration, food industry, etc.

Coil Wound Heat Exchangerhave a wide range of applications across various industries. In the chemical industry, these heat exchangers are essential for maintaining process temperatures and condensing solvents during chemical reactions. The oil and gas industry utilizes these heat exchangers for heat recovery processes and cooling applications in refineries and petrochemical plants, thereby improving overall operational efficiency.

In power generation, Coil Wound Heat Exchangerplay a vital role in thermal power plants by cooling steam condensers and ensuring efficient power generation. The food and beverage industry utilizes these heat exchangers for pasteurization, sterilization, and cooling of beverages and food products. Moreover, in HVAC & Refrigeration applications, Coil Wound Heat Exchangerare an essential component of air conditioning systems, refrigeration units, and heat pumps, providing efficient heat transfer to residential and commercial buildings.

A strong focus on R&D, especially in emerging fields such as biotechnology, artificial intelligence, and renewable energy, has contributed to its global competitiveness. Strategic government initiatives, including incentives for innovation and sustainable development, are also accelerating market expansion. Consumer demand for high-quality, environmentally friendly products is driving companies to adopt greener practices and invest in cutting-edge technologies.

Coil Wound Heat Exchanger (CWHE) are commonly adapted in process engineering for the efficient transfer of heat between fluids which feature wide temperature and pressure ranges. The field of application for this apparatus ranges from heating or cooling of single-phase flows, over the evaporation or condensation of fluids, to the utilization as isothermal reactor. Due to their large specific heat transfer area accompanied by a compact design, coil-wound heat exchangers are widely used in various process plants (e.g., LNG plants).

Depending on the application, twophase flows may occur at both, the tube- as well as the shellside of the apparatus. For the design of a CWHE, the fluid and thermodynamic processes in the unit are commonly represented by a system of one-dimensional correlations. This approach implies uniform thermohydraulic conditions on horizontal cutting planes of the exchanger. Fluid and thermodynamic effects in the apparatus which result in radial parameter variations are inaccessible to these conventional design tools.

To this end, a multidimensional CFD model has been established to enhance the representation of fluid and thermodynamic phenomena in CWHE design. The shellside of the CWHE and all tube-side sections are each numerically represented by separate domains which are coupled by source terms to account for the thermodynamic interaction between tube- and shell-side. In each flow region, the hydraulic effect of the tube bundle is modeled as a porous medium with corresponding fluid dynamic characteristics.

The gas-liquid dynamics in each flow region is modeled based on an Euler-Euler approach. Unlike classical Euler-Euler models, local phase fractions and fluid properties are calculated from species relations as well as pressure and temperature fields. This model framework is augmented by locally evaluated correlations for pressure drop and heat transfer to account for apparatus internals and thermal coupling. The models for gas-liquid interaction forces are derived from standard correlations and augmented by findings from detailed CFD studies. Remaining parameters are specified by a parameterization study based on experimental findings. 

Our factory covers an extensive area and is equipped with advanced production equipment, including 14 flat vulcanizing machines, and the maximum heating plate size can be adapted to various production requirements. The company has more than 750 sets of molds of various models, which can meet the specifications of most heat exchanger brands in the market.