Dubai, United Arab Emirates
Our Products
HRSFUNKE heat transfer plates are characterised by optimum embossing, which leads to high heat transfer coefficients. This results in a low cost heat exchanger which achieves the best possible performance irrespective of the application conditions. Our product range includes single-pass and multi-pass plate heat exchangers with a heat exchange surface of up to 2000 m. In the field of plate heat exchangers HRSFUNKE offers a sophisticated range of products able to meet almost any requirement in machine and plant engineering. HRSFUNKEs special off-set system with asymmetrical flow gaps creates highly efficient and cost-effective units whose performance (depending on design) is up to 17 percent higher when compared with conventional plate heat exchangers. The HRSFUNKE brand stands for highest quality standards and customer-oriented solutions.
Our plates are provided with double gaskets at the inlet and outlet which prevent mixing of the two media. If designed as a safety heat exchanger, double plates are provided with a special sealing system.
The development of corrugated tubes represents perhaps the most exciting advance in heat transfer technology. It has long been accepted that if you agitate a hot liquid it cools faster since the shaking produces turbulence, which enhances the heat transfer from the liquid to the air. HRSFUNKE developed heat transfer enhancing corrugated tubes to achieve a similar result by creating turbulence in the media without using any mechanical shaking. The shallow deformation of the corrugated tube causes the boundary layer to be disrupted without too large a reduction in the flow area and, providing the working diameters are chosen carefully, it does not prevent the free passage of particles or pieces or allow even the most viscous of fluids to bridge adjacent corrugations. Enhanced turbulence created by corrugation results in a higher partial heat transfer coefficient (a), by increasing the Nusselt Number.
Plain tubes offer the best geometry to withstand pressure but the worst for heat transfer due to the rapid build-up of the boundary layer. Plates in a plate heat exchanger induce local turbulence to increase heat transfer coefficient but are limited in terms of operating pressures and temperatures due to the elastomer gaskets. Also, the relatively narrow gap limits their use to fluids without large fibres and particulates. Corrugated tubes take the best features of both the plain tube and the plate heat exchanger.
Gasketed plate heat exchangers reach their limit when it comes to critical media as for example refrigerants, for which the use of gaskets is not advisable. For this type of demanding applications HRSFUNKE can supply semi welded heat exchangers - the FPG series. These are used as evaporators, condensers or oil coolers in refrigerating and pro-process cooling as well as for special chemical applications giving refrigeration engineering without any risk.
DESIGN
The plates of the FPG Heat Exchangers are based on the proven technology of the HRSFUNKE FP series. A cassette is made of two corrugated heat exchanger plates which are assembled at a180 angle to each other. Back to back these are laser welded along the sealing groove provided for the gasket. The aggressive medium or the refrigerant runs through the inlet aperture in this sealed flow channel between the plates. In the entry zone, the grooves of the plates have a special pattern so that the medium can freely run into the cassette. On the outside each cassette is fitted with a gasket. When the critical medium passes from one cassette to the other only two of the four ring gaskets at the apertures come into contact with the medium. These two ring gaskets are made from specially designed, highly resistant material. To ensure flawless sealing these specially designed gaskets are twice as thick as conventional gaskets. Furthermore, in the entry zone of the medium the profile of the gaskets are tapered onto the sealing ring and bridging piece. The flow gap of the less critical medium between the single cassettes is sealed with application specific gaskets of proven quality. The gaskets are mounted without glue using the completely reliable T- Clip - System. In the entry zone of each medium double welding seams and double gaskets between the cassettes guarantee for a leak free operation without any danger of mixing of the media.
MATERIALAs standard, HRSFUNKE heat transfer plates are manufactured from 1.4404/ AISI 316L, titanium is also available. The thickness of the material is 0.6 mm. For the ring gaskets at the changeover area of the critical medium, for example ammonia, chloropene gaskets are used. For the flow gap of the uncritical media NBR or EPDM- gaskets are used. Gaskets can also be made from two different materials, ie the ring gaskets are made from another material than the main gasket frame for example chloropene for the ring and NBR for the frame.
APPLICATIONS
Suitable for HVAC, refrigeration engineering, chemical, sugar, food, marine, power and paper industries.
TECHNICAL DATA
ADVANTAGES
The HRSFUNKEBlock FPB and HRSFUNKEFlex FPF welded heat exchangers are the perfect solution when it comes to high temperatures and aggressive media. These types of heat exchangers are used, for example, in heat recovery or condensing processes in refineries, in the chemical and pharmaceutical industries and in a wide range of other industries. Due to their compact design, with very large heat transfer surfaces, these types of heat exchangers have extremely low space requirements and are also easy to service. The media used in the heat exchange process are supplied and drained through nozzles installed on the covers (FPF) or by casing plates (FPB). The media flows through the plate assembly in a cross flow / cross counter flow pattern, with heat from the hotter medium being transferred to the cooler medium. On account of the turbulent thin layer flow present, this heat transfer is substantially more effective than for other heat transfer models. Baffles can also be employed to ensure that the media pass through the heat transfer process repeatedly.
DESIGN
The plates of the FPB Heat Exchangers are based on the proven technology of the HRSFUNKE FP-series. A cassette is made of two corrugated heat exchanger plates which are assembled at an 180 angle to each other. Back to back these are laser welded along the sealing groove provided for the gasket. The aggressive medium or the refrigerant runs through the inlet aperture in this sealed flow channel between the plates. In the entry zone, the grooves of the plates have a special pattern so that the medium can freely run into the cassette. On the outside, each cassette is fitted with a gasket. When the critical medium passes from one cassette to the other, only two of the four ring gaskets at the apertures come into contact with the medium. These two ring gaskets are made from specially designed, highly resistant material. To ensure flawless sealing these specially designed gaskets are twice as thick as conventional gaskets. Furthermore, in the entry zone of the medium the profile of the gaskets are tapered onto the sealing ring and bridging piece. The flow gap of the less critical medium between the single cassettes is sealed with application specific gaskets of a proven quality. The gaskets are mounted with the completely reliable T- Clip- System. In the entry zone of each medium double welding seams and double gaskets between the cassettes guarantee for a leak free operation without any danger of mixing of the media
HRSFUNKE FLEX FPFDESIGN
The HRSFUNKEFlex is a welded plate heat exchanger with removable, sealed covers whose core consists of a welded plate assembly. Like all parts that come into contact with the media, this core is made of stainless steel and, in contrast to the standard casing, can be tailored to meet specific demands. The standardised design of the compact HRSFUNKEFlex stands out thanks to its flat cover, its extremely efficient heat transfer and its high, specific heat surface density m / m of free space. A main feature of the FPF is also its ability to be easily cleaned. Using the types of plates available for welded plate assemblies - tubular, chevron and dimple, the demands dictated by the flow paths and properties of various media and applications can always be satisfied. Seals can be selected as appropriate, based on their resistance against the media or temperature.
TECHNICAL DATA:
HRSFUNKE has an extensive level of experience in the development and manufacture of shell and tube heat exchangers. A wide range of models allows for the meeting of almost all heat transfer requirements in the oil and gas, food, general industrial processing and chemical applications.
A heat exchanger is an unfired vessel, in which, separated by a thin wall, two media flow without mixing themselves. The temperature difference between the two media leads to the exchange of heat.
As is shown in the schematic below, one medium flows in the shell side whilst the other flows in the tube side. The flow through the shell side is controlled by baffles that generate cross flow against the tube bundle. The design and spacing of the baffles are specified according to the application. The media stream through the tubes is designed as either a single or multi-pass flow and is based on usefulness, velocity and pressure loss.
