Vacuum hot water boilers operate by utilizing the characteristic that water's boiling temperature varies under different pressures. At one atmosphere (0.1 MPa), water boils at 100°C, while at 0.06 MPa, its boiling temperature is 85°C. Vacuum phase-change heat exchanger boilers operate within a vacuum range of 2.67 kPa to 66.6 kPa, corresponding to saturation temperatures of 15 °C to 85°C. Under the operating pressure of the vacuum boiler, combustion raises the temperature of the heat transfer medium (water) to its saturation temperature, generating steam at the same temperature on the water surface. Cool water is then passed through the condenser heat exchanger; the cold water inside the tubes is heated by the steam outside the tubes into hot water, which is then delivered to the user. The steam outside the tubes is cooled, condenses into water droplets, and flows back to the water surface to be heated again, thus completing the entire cycle.
Technical Parameter Table of (LN)HYZK Condensing Vacuum Gas-fired Hot Water Boiler
| project | (LN)HYZK |
| 0.35 | 0.7 | 1.05 | 1.4 | 1.75 | 2.1 | 2.8 | 4.2 | 5.6 | 7.0 |
| Boiler body | Rated power | NW | 0.35 | 0.7 | 1.05 | 1.4 | 1.75 | 2.1 | 2.8 | 4.2 | 5.6 | 7.0 |
| Heat generation | 104 kcal | 30 | 60 | 90 | 120 | 150 | 180 | 240 | 360 | 480 | 600 |
| Rated outlet pressure | Mpa | -0.02 |
| Rated outlet water temperature | ℃ | 70(△t20℃) 60(△t10℃) |
Rated return water temperature | ℃ | 50 |
| Thermal efficiency | % | ＞98 |
| Calculate the heat transfer area | m² | 9.8 | 16.3 | 24.3 | 37.4 | 39.4 | 45.4 | 57.9 | 93.2 | 128 | 186 |
| Net weight | t | 1.53 | 2.4 | 3.25 | 4.35 | 4.6 | 5.58 | 6.85 | 9.51 | 11 | 14 |
| Water capacity | t | 1.35 | 1.8 | 2.25 | 2.6 | 2.75 | 2.85 | 3.35 | 4.15 | 4.7 | 5.4 |
Furnace body
dimensions | L | mm | 2616 | 3166 | 3710 | 4010 | 4060 | 4360 | 4790 | 5881 | 5750 | 6270 |
| W | 1376 | 1476 | 1500 | 1560 | 1700 | 1700 | 1770 | 2340 | 2340 | 2340 |
| H | 1825 | 2065 | 2350 | 2510 | 2650 | 2710 | 2960 | 3100 | 3180 | 3260 |
| Fuel consumption | fuel |
| Light oil/natural gas |
| light oil | kg/h | 32.4 | 63.3 | 94.9 | 126.6 | 158.2 | 189.9 | 253.2 | 379.8 | 512 | 570 |
| natural gas | Nm³/h | 38.4 | 76.7 | 115 | 153.4 | 191.7 | 230.1 | 306.8 | 460.2 | 608 | 697 |
Note: 1. Fuel calculation benchmark values: (1) First calorific value of natural gas: 8500 Kcal/Nm³; (2) Calorific value of light diesel oil: 10300 Kcal/Nm³/kg.
2. Our company is constantly pursuing technological innovation. If the above parameters change, the product factory data shall prevail.
