From the last century since the mid-to natural gas began for residential heating and domestic hot water production, many developed countries have become major household energy residents. Adoption of domestic gas wall-hung boiler or small floor boiler production of hot water for residential independent heating abroad has been widely used for many years and the technology has matured in recent years in China also began to be accepted and used. Distance from the central heating pipelines of residents, this system will let them no longer cold in winter.
Relative to Central gas heating system, gas independent heating advantages are clear. First, it installed in every household, small gas boiler that eliminates the centralized boiler room occupied by the land, reduced heat loss of outdoor network. Second, it makes it easier for each household, in accordance with their respective needs flexible adjustment of the boiler load, which typically does not require continuous heating of residential buildings, energy-saving effect is obvious. Finally, for the central heating system difficult to charge by heat, independent gas heating system you can easily through the gas meter readings to achieve thermal "household metering." Therefore, whether from heating to think in terms of thermal comfort or improving energy utilization point of view, this system has its advantages, is a promising way of heating.
Quality system for the safety of the residents of the heating and convenient
Currently prevail in the global market of household gas-fired boilers from its shape, mainly in the boiler and two small floor boiler. Generally speaking, these two kinds of boiler combustion environment on the living room is closed, their burning need air through the air channel from outside, after combustion flue gas by smoke pipe flows into the rooms, this prevents the combustion of natural gas on the effects of indoor air quality. This system inlet pipe and exhaust pipe composed of "balanced flue" may take the form of pipe-in-pipe or two tubes separate forms, which facilitates recovery of the heat in the flue gas, improve the thermal efficiency of boiler, which will help reduce air flow in pipe flow losses, lower fan pressure head.
In addition, these two boilers were already has more product perfect safety protection device, for example in the French energy training center installed multiple boiler products have anti-freeze protection, flame-out protection, anti-backflow protection, combustion does not fully self-locking, lack of water protection, powered down, self-locking self protection and many other features. At the same time as household devices, these products provides users with a simple, practical control panel and internal control procedures.
In addition, the residence used by the household gas-fired boilers can according to user needs to provide domestic hot water and select single heating boiler or provide domestic hot water heating boiler. Provide domestic hot water heating boilers, domestic hot water are typically independent heat exchanger for indirect heating water, heating of the form that is heated, half the heat and positive displacement, etc. Provide domestic hot water heating boilers are usually adopts domestic hot water priority control programmes that have domestic hot water requirements, the boiler will automatically suspend the supply of heating water.
General household gas boiler may be based on the heating equipment and users on the indoor temperature, automatically provide temperature is 30 degrees centigrade-90 degrees centigrade range of heating and hot water that can meet a wide variety of heating terminal equipment, including ordinary radiator system, floor radiant heating system and air blower plate Tube heating system purposes.
The design of local conditions so that residents of heating comfort and economy
Overall, this independent heating methods in the system than centralized heating system is simple, but because its application in China is still in its infancy and still pay attention to some technical problems in the design. Separate gas heating system pipes connected with the central heating system, can also be arranged according to terminal equipment and the temperature adjustment requirements choose single, double, or in the form of different leg reverse return. To solve the normal single-pipe system for each group of thermal equipment separate regulation affects the entire system of European practice in each group of heatsink installed a similar cross tube and valve of special equipment.
European independent heating system, the more commonly used two-pipe system. For multiple thermal equipment connected systems, in order to facilitate the hydraulic balance between devices, when the device is circular layout, you can use with the program system. For floor radiant heating system or terminal equipment requires a separate regulation systems, often using set, water separator to connect and control the loop, this is the so-called "Octopus-system".
If a household gas-fired boilers required to provide a variety of hot water at the end of the heat equipment, must take into account in the system design for each device on the flow and temperature requirements, more effectively boiler and cooling equipment.
For example, to make a more uniform indoor temperature distribution, increase the efficient use of space in the room, room decoration, many houses in the bedroom and living room with a floor radiant heating way, while in the bathroom and kitchen and wet narrow space using the traditional radiator heating methods. Floor radiant heating way through heat pipe the water temperature is low, if you use plastic heating pipe, in order to ensure the ground is less than 28 ° c average temperature, water temperature should not exceed 50 degrees centigrade. In addition, to make the room temperature distribution, supply and return water temperature is generally less than 10 ° c, therefore a large circular flow. And for traditions of radiator heating methods, improving water supply temperature increases the heat sink temperature of heat transfer to the room, thereby reducing the required size of the heatsink.
For example, there are a number of houses in the bedroom and living room with air blower plate Tube, while in the bathroom and kitchen, and other non-air-conditioned rooms with traditional radiator heating methods. Air blower plate Tube method using forced convection heating indoor air, from the comfort of perspective, outlet temperature should not be too high, so the fan coil water temperature usually 65 ℃ below, a large circular flow.
When a House there are several thermal equipment, floor radiant heating or fan-coil system can adopt "Octopus" connection, and you can use three types of design: first radiator with water and water from boilers through three-way valve after entering the mixed water separator,
Heat sink for two-pipe connections. The second is the radiator water and water from the set back through three-way valve mixed into water separator, radiator for single-span connection. The third is from boiler water supply and water from the set back through three-way valve mixed into water separator, which is connected to the double-pipe heat sinks. In addition, to ensure that fan-coil and radiant floor heating pipe flow, the latter two system forms also require additional one pipeline circulation pump and heat load calculations, and hydraulic pump selection. Project design can be combined with the actual situation in the other forms of connection, but should consider all the thermal characteristics of the device.
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