VP-OPT gas-liquid heat exchanger is a plate heat exchanger consisting of ribbed panels, steel sheets with longitudinal ribs welded by high frequency currents (Pic. 1а).

Ribbed panel welding technology for VP-OPT heat exchangers

Two variants of module gas element arrangement are used in VP-OPT heat exchangers (Pic. 1b):

  1. The panel is covered by the similar ribbed panel (“with ribbed cover”) so as its ribs should be located between adjacent ribs of the basic panel;
  2. The panel is covered by the sheet without ribs ("with cover without ribs ").

The first variant is used to increase the area of the module heat-exchange surface. At that the interval between panel ribs decreases along with the medium passage area. Generally this panel arrangement is used for gas (air or flue gas) passage.

Usually gas panels are made out of 1 or 1.5 mm sheet steel. Panel material meets the heat exchanger specifications depending on its operating conditions. Generally stainless or heat-resistant steels are used.

We accumulated great experience in designing and manufacture of the high-performance analogues for the gas-liquid casing-tube heat exchangers (TNG, TNV, TKG, TKV, TPG, TPV, TU, etc.), generally designed according to TU 3612-023-00220302-01, ТU 3612-024-00220302-02, ТU 26-02-1102-89. Due to HFC welding application VP-OPT heat exchangers are more reliable and at the same time more available alternative to the heat exchange equipment of the abovementioned “classic” designs. Moreover, VP-OPT are always designed reserving all location dimensions of the preceding equipment.

Liquid panels are also used in VP-OPT heat exchanger together with the gas ribbed panels. Liquid panel (Pic. 2) has a set of its own ribs designed to separate liquid flow and hence to form several medium stream ways. This determines the best wetting property of liquid panel heat exchange surfaces, and also provides increase of medium flow velocity resulting in increase of the liquid heat transfer coefficient.

Material used at liquid panel manufacture depends on heat exchanger operating conditions. Generally copper or corrosion-proof stainless steel is used.

Several liquid or gas panels are connected between each other so as to lay liquid channels between gas channels (Pic. 3) in order to arrange the cross pattern of the heat transfer medium and the heated medium circulation through the channels. Liquid panels are joined by the common supply and discharge manifolds and gas panels can be joined at request of the customer by the diffuser and confuser at inlet and outlet, accordingly.

New generation heat exchangers are able not only to replace successfully the existing devices but also to be installed due to its features in the places where the classic heat exchanger installation is impossible or inadvisable (due to its technical and economic characteristics). This provides great costs and energy saving on the industry scale.

Material used for liquid panel manufacture depends on the heat exchanger operating conditions.
Generally copper or corrosion-resistant steel is used.

VP-OPT gas –liquid heat exchanger operation scheme

The general view of VP-OPT gas-liquid heat exchanger is given at Pic.4. Provided that liquid supply and gas inlet are located on one side of the heat exchanger, thus, so-called concurrent or correspondent medium flow takes place. Provided that liquid supply and gas inlet are located on the different sides of the heat exchanger we can suggest the counter-flow or the reverse medium flow (Pic. 5). Under otherwise equal conditions the heat exchanger with the “counter flow” principle is considered to be the more effective, thus, generally this scheme is used.

One way for gas flow and high gas velocity (exceeding self-cleaning velocity) inside channels generally prevents clogging and slagging of gas ducts resulting in high reliability and stability of the heat exchanger operating parameters during operation. But in some cases, for example at very restricted permissible heat exchanger resistance, the gas velocity is inadequate for self-cleaning. Then we recommend providing access covers and inspection windows to monitor the gas duct condition at the heat exchanger inlet. If necessary the heat exchanger cleaning doesn’t require any special skills due to its design features.

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