Weak current College】 【solar floor heating system and auxiliary heat source --- Power By】 【China power house network.

<br> <br> 1. introduction <br> <br> China's rapid economic development, energy production and development much more relative to lag, the economic development of the energy needed to be more reliance on energy-saving. China's vast population, .huge, including residential construction accounted for 92 per cent of the construction works. Because residents economic conditions improve, so for a long period of residential building will rise, and this upward trend will last 20-30 years. Thus seen, our residential construction is .in rapid development. <br> <br> But we must soberly, our massive and rapid growth of housing construction is based on the resource and energy consumption at the expense of high return, in addition to the use of land that most direct resources, .residential energy consumption of residential construction development growth is a major limiting factor. Currently, due to the heat insulation of a building in China and airtight performance comparison, unit residential building area heating energy consumption is the same climatic conditions 3 times that of developed countries. .Embodied in the heating of poor quality (ie, room temperature and cold are not), the thermal efficiency of the system, not only more energy consumption multiplied, and users will not be able to adjust the room temperature. Current heating costs by square meter .billing, does not contribute to the user's awareness, resulting in a number of unusual phenomena, such as the room temperature is too high opens the window, the room temperature is too low, allowing designers and owners try to intensify the boiler, pump and radiator ., inefficient, wasting energy consumption of the repeat. At present, China's energy consumption is very reasonable, the structure of the building can still to coal, renewable energy in the building can be applied in very few. Heating energy consumption not only causes the wastage .of resources, but also air pollution. <br> <br> 2 floor radiant heating system advantages <br> <br> Radiator heating is building a common form of heating. With the continuous development of the social economy, the people's standard of living ., new materials, new technology is increasingly promoted application, the drawbacks of traditional heating forms have become increasingly prominent, such as the difference of thermal comfort, energy consumption, the consumption of steel products in many large, not easy to press the heat metering, .not individual room temperature control, etc. And low-temperature radiant floor heating is to overcome these drawbacks of a good way. <br> <br> Low-temperature radiant heating takes less than 60 ° c, low temperature water as htm, through .direct buried within the building floor xpap (PAP, XPAP) or cross-linked polyethylene pipe (PE-X) coil radiation to achieve a flexible form of heating. <br> <br> Practice shows that low-temperature radiant floor heating has the .following characteristics: <br> <br> 2.1 comfortable health <br> <br> Because of the radiation intensity and temperature of the dual role that reduces ambient surface cold radiation on the human body, the interior surface temperature uniformity, gradually decreasing temperature bottom .-up, changed the radiator heating and low-temperature being high in upper part of the distribution of a head cold feet warm good feeling, resulting in a truly human thermal and physiological requirements of the hot state, in line with the traditional medicine "warm .foot cool roof "theory of fitness, you can improve the blood circulation, promote metabolism, with the best comfort and health functions. <br> <br> 2.2 energy-efficient <br> <br> In establishing the same comfortable premise, because .radiation heating a convection heating mode the thermal efficiency is high, the energy of about 35 percent. So the interior design temperature can lower than other heating of. 2 ℃ <br> <br> 2.3 good thermal stability <br> <br> As .the surface layer and concrete layer heat, thermal stability, therefore in intermittent heating, indoor temperature changes slowly. <br> <br> An increase in the size, 2.4 use convenient decoration <br> <br> Indoor cancelled the heatsink and the legislative .branches, not only does not occupy the building area and room can be separated according to the actual calculation, the average increase indoor 5 per cent of area, equal to the lower housing costs. And indoor both good-looking and easy decoration and furniture layout .. <br> <br> 2.5 sanitation <br> <br> Floor heating indoor air average velocity, can effectively reduce the air caused by the rapid flow of dusty, and Ming-radiator equipment and piping dust surface heating of volatile odors, reduce .indoor air pollution. <br> <br> Similarly, the low-temperature radiant heating also exist at the beginning of the investment is high, storey and loads increase, construction costs, poor maintainability. <br> <br> 3 solar floor heating .system in the form of feasibility and system <br> <br> Our country is very rich in solar energy resources, in addition to the local area in Sichuan basin, etc are not suitable for solar energy utilization, in most parts of China are suitable .for the use of solar energy. In particular, Northwest, Southwest, North China, should make full use of solar energy that clean, renewable energy, reduce building energy consumption. China solar energy use patterns are mainly low-temperature thermal use of solar energy .and solar technology. At present, our country's actual situation and the capacity of residents, optoelectronic technology costs are too high, not suitable for building energy-saving application. And solar energy in the building's thermal utilization, especially with the low-temperature radiant floor .heating system, a joint application, significantly improves the efficiency of solar thermal, avoid the area of solar water heater only use limitations. <br> <br> Low-temperature radiant floor heating system and traditional forms of heating radiator, a prominent characteristics than .is the htm temperature low, htm temperature requirements only 35 ℃ ~ 45 ℃. And ground heat storage structure of the backfill layer, increasing the system's inertia. Because of the low-temperature floor heating system with these characteristics, solar this low-grade, .cleaning, use sophisticated energy as low-temperature floor heating system with a heat source, is more reasonable and feasible. <br> <br> Solar floor heating primarily come in two forms, one is intermittent operation system, is a solar heating system during .the day to collect solar energy and energy saving, in night-time operation on room heating system. The system structure is simple and practical, initial investmentRelatively low. This system is suitable for winter outdoor temperature is not too low, the sunny regions such as .China, North China, Northwest of some regions, as well as parts of Southwest China. Use of regenerative South of wall and floor, Basic does not require a heat source in the daytime you can maintain the room temperature of around 16 ° c. If .the daytime heat storage temperature of 40 ° c, night on the water tank of water in the heating temperature drop to the ultimate water temperature never falls below 30 ° c, could basically meet the heat requirements. But the vast majority of current heating areas also .require thermal building during the day, and because the supply of solar energy from the impact of climate, weather is very large, continuous operation of solar floor heating indirect systems is applied more widely in the form of a system (see Figure 1). The .solar thermal system and heating system are two separate systems, the system uses the heat exchanger for heat exchange of forms. In order to ensure that the system runs continuously, solar heating system must have other auxiliary heat source as security. Auxiliary heat source can be .flexible. If solar heating efficiency is high, you can use electric auxiliary heating source, otherwise from economics, with gas boiler use reasonable <br> <br> 4 solar floor heating system and auxiliary heat source <br> <br> If the area .is low price, will power as a complementary heat source, is the ideal choice, features a clean, easy to operate, but the high-quality electric energy as a heating source of heat, just save the running cost, no real sense do energy .saving, moreover in most parts of China have not implemented the bottom price. <br> <br> Gas boiler heating mode with power enough gas furnace for heating the residential units and supply of domestic hot water. Its equipment and compact appearance, can be .wall-mounted installation in the kitchen of the House, like a slightly bigger gas water heater does not affect the use of the kitchen area. It is easy to use single-family measuring magnetic gas meter implementation use hot household metering, a solution to the .perennial heating costs owed, another challenge is to conserve energy, boiler room, the second heat, outside the network and building pipeline heat loss, heat energy savings of about 7 percent. Because it is a secondary solar heating system for intermittent operation mode, it .is the actual usage is not high, low running cost. From floor heating, although in our use of time is not very long, but its basic design and construction is forming technology, and many buildings with floor heating after which have been successful, the .technology can be said to have more mature. For solar energy collection section, because the system is the need for mechanical circulation, collector has high load-bearing capacity. The current home of vacuum tube collectors clearly do not meet the requirements, recently many solar .collector manufacturers have developed several U-tube and heat pipe solar collector, reach their carrying capacity, which is totally above 1.2MPa meets the requirements of the machine cycle. <br> <br> If economic conditions allow, the building's envelope composite energy saving .wall, such as "polystyrene Board paste external wall insulation system", wall insulation, due to internal entity wall heat capacity, save energy storage room more heat, such as solar radiation or intermittent heating indoor temperature changes caused by slow, at room temperature more .stable, more comfortable living environment, solar radiation, heat gain, body heat, home appliances and cooking heat generated by factors such as "free hot" better utilization, conducive to saving energy. <br> <br> 5 conclusions <br> < .br> (1) gas boiler as solar-temperature floor heating system for auxiliary heating source, energy in the form, the system guarantees the comfort requirements, are feasible. <br> <br> (2) comparison of solar resources in China is .a country, the use of green, clean solar energy for low-temperature floor heating, then to gas boiler auxiliary heating source as a system, in Northwest China, North China not only from a theoretical or practical, are perfectly feasible. <br> .<br> (3) at present, because solar thermal equipment costs more, solar energy and building integration degree of integration is not high, greatly restricts the use of the solar system. <br> <br> (4) solar energy application of .floor heating system, for non-renewable fuel savings, reduced energy consumption, complete our building energy saving goals are important. At the same time to reduce atmospheric pollution, preventing further deterioration of the environment will play a positive role in China's construction industry in the .sustainable development provides a strong support. <br>.