（1） Characteristics of NBHRV-01/02

NBHRV New Generation Efficient Constant Temperature Wave TubeHalf volume heat exchangerIt is the fifth generation new product that has undergone significant technological upgrades based on similar equipment and original HRV/BHRV products both domestically and internationally. Its main thermal performance has been tested and verified by the Thermal Testing Center in collaboration with Zhejiang University Architectural Design Institute and Shanghai Huajian Design Institute. All indicators far exceed those of similar products, and it has the following characteristics:

1. Unique structure: Wave joint heat exchange tube bundle with multiple heat medium processes,

After multiple bends in the hot water flow, it enters the tank through the external circulation pipeline and flows into the flow stabilizer. Water enters at the bottom of the swirling flow, and laminar flow advances.

2 Thermal performance: Heat transfer efficiency and heat transfer equivalent to traditional methodsheat exchanger5~8 times higher, with a K-value coefficient of 2500~3000 Kcal/(㎡·° C · h) for steam water, and 1300~1600 Kcal/(㎡·° C · h) for water water heat exchange. The temperature drop of the heat medium is large, and a large amount of waste heat is recovered, resulting in low-carbon emissions, green energy conservation, and environmental protection.

3. Heat storage and volumetric efficiency: With rapid heat exchange, large heat storage capacity, and the ability to store hot water for more than 20 minutes, the hot water in the tank can still maintain stable water pressure and temperature even when the heat medium is affected. It is characterized by safety, water conservation, and comfortable water use. All hot water is stored in the tank, truly achieving no stagnant area for cold and hot water, with a volume utilization rate of 100%, completely solving the problem of "Legionella bacteria" breeding at the bottom of the heat exchanger tank. It is the preferred heating equipment for centralized hot water supply systems in hospitals and other buildings.

4. Large heat exchange capacity and small tank body: With a compact structure and small footprint, the design and selection of heat exchangers are optimized and streamlined in terms of volume and quantity under the same heat consumption conditions, greatly reducing investment costs, saving machine room area, and facilitating installation and maintenance.

2、 Design Instructions for Use

1. This series of heat exchangers is suitable for hot water supply systems in general industrial and civil buildings. The heat medium used is steam or high/low temperature softened hot water. When designing and selecting, the type of heat medium should be specified.

2. Each specification of heat exchanger is equipped with two types of heat exchange areas. To ensure a storage time of 10-20 minutes and fully utilize its efficient heat exchange performance, a smaller heat exchange area should be selected for steam water heat exchange, and both types of heat exchange areas can be used for water water heat exchange.

3. The outlet temperature of the heated water should not exceed 75 ° C. In actual use, to delay scaling, the outlet temperature of the heated water should be controlled between 50-60 ° C.

4. The shell material of the heat exchanger is stainless steel: S30408, S31603. The carbon steel lining is T2 purple copper skin, and the carbon steel composite is SUS444. The outer wall of the shell is coated with acrylic polyurethane hammer paint for corrosion protection. The U-shaped tube is made of purple copper tube or large corrugated tube.

5. Install a safety valve on the top of the heat exchanger, and the working pressure of the safety valve should be the same as the "design pressure" value selected from "Table 1" to "Table 4" (to be declared when ordering the safety valve). The installation and use of the safety valve should comply with the "Fixed Type" issued by the State Administration for Quality and Technical Supervisionpressure vesselThe provisions of the Safety Technical Supervision Regulations.

6. When conditions permit, move towards the top of the heat exchanger An expansion tube that leads to the atmosphere; If expansion pipes cannot be installed, an expansion tank or pressure type expansion tank can be connected to the heat exchanger.

7. Heat exchangers should be regularly inspected during use, with at least one visual inspection conducted annually, at least one internal and external inspection conducted every three years, and at least one comprehensive inspection conducted every six years. The content and requirements of inspection and testing can refer to the "Safety Technical Supervision Regulations for Fixed Pressure Vessels".

8. During the use of heat exchangers, the scale on the U-shaped tube should be regularly cleaned according to the quality and usage of the heated water. When the hardness of the heated water is high, appropriate softening measures should be taken.

9. Equipment number description:

3、 Operating instructions

1. First, fill the heat exchanger and the entire hot water pipe network with cold water;

2. Turn on the hot water circulation pump in the pipeline network, and at the same time, open the valves on the inlet and outlet pipes of the heat medium to evenly heat the cold water in the heat exchanger and pipeline network to the set temperature. Then open the temperature control valve to put it into operation, and the system will be put into normal operation.