1. Product Introduction and Performance Characteristics
HTRJ-BF vertical semi volumetric typeFloating coilseriesHeat exchange unitAdopting a system integration design, the structure is more compact, with a high degree of automation, and can be widely used in domestic hot water supply systems. The heat exchange unit is composed ofHeat exchange equipmentThe entire unit is composed of an expansion tank, a system circulation pump, valve connecting pipelines, and a control system. It is integrated with an electromechanical system, with a reasonable layout, compact structure, small footprint, and easy use and maintenance. The heat exchange unit adopts modular design, which can be optimized and freely combined according to different water usage conditions of users. The overall configuration is advanced and reasonable
2. Unit composition and selection of brands and materials
2.1. The unit is equipped with DFHRV vertical semi volume floating coilheat exchangerComposed of expansion tank, system circulation pump, control system, valves and connecting pipelines;
2.2. Equipment, valves, pipeline models and materials selected for the unit:
1) Heat exchanger: DFHRV vertical floating disc semi volumetric water heater
Material: Shell carbon steel lined with copper, carbon steel composite 444, stainless steel S30408 or S31603, coil: purple copper T2;
2) The temperature control valve brands selected are Siemens from Germany and Honeywell from the United States;
3) The circulating pump brand is selected from Grundfos and Southern Pump Industry, and the material is made of stainless steel or carbon steel; 4) The material of the expansion tank is made of outer carbon steel and inner diaphragm;
5) Valve brands selected include Shanghai Lianggong and Emeco;
6) The material of the connecting pipe is thin-walled stainless steel S30408 and S31603;

7) Schneider is selected as the brand of control components ABB、 Siemens and Chint.

3. Model description of heat exchange unit

4. Operating condition description
1) ST steam water exchange: Heat medium: 0.4MPa saturated steam, T1=151.1 ° C, T2=60 ° C Secondary hot water: t1=10 ° C, t2=60 ° C
2) WT water water exchange: Heat medium: T1=85 ° C, T2=60 ° C
Secondary hot water: t1=15 ° C, t2=60 ° C