Basic Principles

1. Atmospheric pressure hot water boiler

Atmospheric pressure hot water boiler is also called non-pressure hot water boiler. The drum is filled with water and heated by direct combustion in the furnace to form hot water. It belongs to the category of civil domestic boilers. The atmospheric pressure hot water boiler is a non-pressure hot water boiler with an air vent on the top and the boiler body is always in a normal pressure operation state. Its main feature is that the boiler is not under pressure and has no potential safety hazards. , mainly used for heating and production of hot water, is one of our more common boiler varieties.

Advantages: simple to manufacture and easy to install; the boiler is directly vented to the atmosphere, which is safer than the pressure boiler;

Disadvantages: The boiler system cannot directly supply heat because it cannot bear pressure. It needs to be equipped with accessories such as external heat exchangers. The cost of the system is high; the startup is slow and the preheating time is long; after the boiler is scaled, the thermal efficiency decreases year by year, and the service life generally does not exceed 8-10 year;

2. Vacuum hot water boiler

The vacuum boiler forms a negative pressure vacuum environment inside the closed furnace body, and fills the heat medium water in the body. The heat medium water is heated by combustion or other methods, and the heat medium water is heated to generate steam, and the steam heats the water in the heat exchanger tubes through condensation heat exchange to realize the supply of hot water.

Advantages: high thermal efficiency, the boiler will never scale, and achieve semi-permanent life (more than 20 years); fast start-up, small preheating loss; multi-channel water supply, multi-purpose for one machine; negative pressure operation, safer.

Disadvantages: high manufacturing requirements; hot water outlet temperature up to 90 ℃.

Comparison of heating systems

1. The hot water supply system of the atmospheric hot water boiler is adopted:

According to the current national standards and specifications, the atmospheric pressure hot water boiler is not allowed to bear pressure when it is in operation. In order to meet the usage requirements when the heating system is running, it can only be made up by configuring other auxiliary equipment in the system to make it perfect. System Features:

a. The system is complex, with many equipment and control systems, which are prone to failures and cumbersome operations (requires full-time personnel);

b. There are many auxiliary equipment, high installation requirements, large floor space, and increased initial investment;

c. The number of intermediate heat exchanges is large, the heat loss of the system is large, the operating cost is high, and the thermal efficiency of the system is low (about 80%);

d. The maintenance cost is high, and the service life of the boiler equipment is short (about 8 years);

e. The water temperature of the hot water tank cannot be controlled, the water temperature is not constant, and the water temperature of the hot water supply system fluctuates greatly.

2. The hot water supply system of vacuum hot water unit is adopted:

According to the structural characteristics of the vacuum hot water unit, the state expressly stipulates that it is not a special equipment, can withstand pressure (standard pressure 1.0Mpa) during operation, and can be directly connected to the system for use. System Features:

a. The system is simple and reliable, and the operation is convenient (unmanned operation is possible);

b. Less equipment configuration, low installation requirements, small footprint, and low initial investment;

c. The intermediate heat exchange loss is almost zero, the operating cost is low, and the thermal efficiency of the system is high (over 90%);

d. Maintenance is simple, the cost is low, and the service life of the unit equipment is long (up to 20 years);

e. Automatic constant temperature water supply, high quality hot water.
 
Summary

1. The vacuum hot water unit is the only boiler equipment that is exempted from inspection by the state expressly stipulated. It has unparalleled safety of other boilers, and users can use it with peace of mind.

2. Due to the heat exchanger in the vacuum hot water unit, the user does not need a plate heat exchanger, which reduces investment and the system is simple. One machine has multiple uses, and can directly supply heating and sanitary hot water without external heat exchange, which can save 10 to 15% of operating costs compared to ordinary hot water boilers.

3. The use of vacuum hot water boiler can save the power consumption of the water circulation pump once (calculated at 22kw per hour, 10 hours a day can save 220kwh of electricity).

4. The vacuum hot water boiler will never scale or corrode, the service life is more than twice that of the ordinary hot water boiler, the equipment depreciation rate is low, and the investment return period is long.

5. In the initial investment comparison of the project, factors such as equipment investment, system installation, computer room space occupation, etc. are considered. It is economical to choose a vacuum hot water boiler system;

6. During the operation of the system equipment, factors such as operating costs, personnel allocation, and maintenance costs should be considered. It is economical to choose a vacuum hot water boiler system;

7. In terms of equipment use cycle, the vacuum hot water boiler has a long service life and always maintains high thermal efficiency. In other boilers, once scale is formed inside, the thermal efficiency will decrease, the operating cost will continue to increase, and the service life of the boiler will be affected. Therefore, the choice of vacuum hot water boiler system is economical.