Selection and Application of Volumetric Heat Exchangers
Release time:
2021-07-02 13:29
Source:
The volumetric heat exchanger is a widely used type of heat exchanger. It mainly consists of a body, steam coil assembly, steam inlet and outlet, and hot and cold water inlet and outlet. So how to choose a volumetric heat exchanger? Today, let's introduce the selection method of volumetric heat exchangers. Everyone understands heat exchangers.
I. Introduction to Volumetric Heat Exchangers
A volumetric heat exchanger mainly consists of a main body, a steam coil assembly, steam inlet and outlet, and hot and cold water inlet and outlet. To prevent corrosion of the inner surface of the body, an anti-corrosion layer alloy surface coating. Alloy layer paint layer, eliminating the original tube box. The steam coil is directly connected via flanges, featuring simple and reasonable structure, long service life, good heat exchange effect, and energy saving.
II. Advantages of Volumetric Heat Exchangers
1. Large temperature drop of the heat transfer medium in the volumetric heat exchanger. When steam and water exchange heat, the condensate outlet temperature is about 50℃, and drain outlets need to be set at both the top and bottom of the return water pipe for convenient use and maintenance. When water-water exchanges heat, the temperature drop is 2-2.5 times that of similar heat exchangers. Hot water at 120-150℃ can be reduced to 70-75℃ after heat exchange.
2. The volumetric heat exchanger has a good heat exchange effect, good heat dissipation effect, small heat dissipation loss, and energy saving. At the same time, when steam is used as the heat transfer medium, about 15% of the condensate heat can be recovered, accounting for the entire heat exchange.
3. Small cold water area, high volume utilization rate.
4. Maintaining the advantages of large water storage capacity, low head loss, stable and safe water supply, and convenient descaling for volumetric heat exchangers.
III. Selection Method of Volumetric Heat Exchangers
Selection is completed through calculation; selection is completed by calculating the heat exchange area. Simple to use in production, specifications and models can also be selected based on experience. Most require detailed calculations to complete the selection.
The selection of a volumetric heat exchanger should first consider the hourly water usage, and secondly, the buffer volume to prevent hot and cold water mixing. Generally, the buffer volume is1/4 of the hourly water usage. Or according to the buffer water volume of 10-15 minutes.
A volumetric heat exchanger consists of three main parts: a hot water tank, a built-in heater, and an automatic temperature control. Main structural features: using multi-pass with good heat transfer effectU-shaped tubes as heating elements, side opening inspection holes for convenient maintenance, water supply designed according to secondary flow rate, ensuring stable water supply even during peak water usage. Easy to achieve automatic temperature control, small changes in water supply pressure, ensuring system hot and cold water pressure balance. High heat transfer coefficient of the heating part, large heat exchange capacity, sufficient heat exchange, and convenient maintenance. The heat exchange structure mainly uses U-shaped tubes, with a net distance of 11-25mm between the outer walls of the tubes, facilitating cleaning and maintenance.
IV. Applications of Volumetric Heat Exchangers
Suitable for hot water supply systems in general industrial and civil buildings. Volumetric heat exchangers are widely used. Radiators used for heating in daily life, condensers in steam turbine units, and oil coolers in aerospace rockets are all heat exchangers. It is also widely used in the chemical, petroleum, power, and nuclear industries. Its main function is to ensure the specific temperature required for the medium during processing, and it is also one of the main pieces of equipment for improving energy utilization.
V. Cleaning Methods for Volumetric Heat Exchangers
Due to the complex pipe layout, the pickling solution is difficult to fill the entire pipe cavity, and traditional cleaning methods (pressurized pickling of the entire pipe system, followed by soaking, venting, and circulation) chemical cleaning methods cannot be used. Moreover, chemical cleaning methods are very expensive. Later, pressure1000bar, flow rate 64L/min high-pressure cleaning machine was used for segmented cleaning every 30 meters, which not only greatly reduced the cost but also greatly improved the cleaning efficiency and effect.
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