Abstract: The characteristics of ground source heat pump and low temperature radiant floor heating system are introduced. By comparing the initial investment and operating cost of ground source heat pump, low temperature radiant floor heating system and traditional chiller unit and radiator system, The combined operation of floor radiant heating system has great advantages in terms of energy conservation, environmental protection and operation costs, and points out the problems to be solved in promoting this air conditioning heating mode. Keywords: ground source heat pump low temperature radiant floor heating energy saving and environmental protection 1 Introduction For a complete heating and air conditioning system, the basic composition must have three parts, namely, hot (cold) source, piping system and the end (to the indoor supply How to choose the hot (cold) source and the end device of the system reasonably has always been the persistent pursuit of the construction equipment and environmental engineers and scientists. In many of the previous literature and research literature, most of them were the technical, economic and other analyzes of cold or hot sources or ends alone. However, it is equally important for heating and air-conditioning systems to select matching sources and ends in the form of many cold (heat) sources and end systems. 1.1 Introduction to ground source heat pump Ground source heat pump was first proposed in a patent document of Switzerland in 1912. It is a high efficiency and energy saving heat pump system that uses the cold and heat of underground shallow geothermal resources (soil or groundwater at room temperature) Respectively, can be used as heat pump heating in winter and at the same time, the earth can store cold for summer cooling; on the contrary, as a cold source in summer and storing heat for winter use, the ground source heat pump has the following characteristics: (1) Heat pumps are renewable energy because they store both heat and heat interactively during the winter and summer, while the Earth's surface absorbs and stores 47% of the solar energy, which is 500 times the amount of energy used annually by mankind, which Nearly infinite energy stored in the shallow superficial layer is an inexhaustible source of renewable energy, in line with the trend of sustainable energy development. (2) The discharge of ground-source heat pump pollutants, equivalent to only 60% of air-source heat pump, is 30% of ordinary boiler heating system. Although it also uses refrigerant, it is a true eco-friendly system with 25% less fill than conventional air conditioners. (3) Ground source heat pump is a cost-effective cold (heat) source, its use of ground energy or surface temperature can be relatively stable throughout the year, winter than the ambient air temperature is higher than in summer, ambient air temperature is low, is Good heat pump heat source and air conditioning cooling source, this stable temperature makes the ground source heat pump COP value is relatively high in summer about 4.1 (traditional cold source 2.9), winter 3.1 (traditional heat pump 2.8), energy saving and saving running costs up to 40 %, Otherwise the temperature can be stable, which makes the heat pump operation more reliable and stable, to ensure the stability of the system, efficiency and economy. (4) ground source heat pump can be a multi-purpose machine. It can be used for heating, air conditioning, domestic hot water, which is suitable for hotels, shopping malls, office buildings, schools, residential, more suitable for villas, is a great potential for the development of cold (heat) source. 1.2 low-temperature radiant floor heating Introduction Low-temperature radiant floor heating is a system using the ground inside the building for heating systems that use all or part of the ground as a cooling surface, the floor cooling surface mainly in the form of radiant heat (about the total heat 61.25%) to indoor cooling. Low temperature radiant floor heating as a form of heating in winter, as early as the 1930s in foreign countries have been applied in the 1950s in the Great Hall of the People, Overseas Chinese restaurants and other projects have also been applied, but at that time due to the Material industry and technical conditions, floor heating technology has been restricted. With the development of China's plastics and chemical industry, plastic pipes such as PEX, PERT, PPR, PB and XPAP which are resistant to high temperature, high pressure, anti-aging and bending have been provided. They provide a reliable material guarantee for low temperature radiant floor heating technology, Compared with the plastic pipe, the pipe has the advantages of corrosion resistance, anti-aging, low cost, no interface under the ground, easy scaling, and low resistance. Generally, the service life of the plastic pipe can reach more than 50 years. Low-temperature radiant floor heating system with high efficiency and energy saving (compared with the average radiator heating system up to 50% energy saving), low operating costs, comfortable and sanitary, long life, easy to heat measurement and charging, the available heat source, saving construction effective Use area and so on. 2 ground source heat pump and radiant floor heating coupled analysis As the ground source heat pump system using shallow ground to create low temperature hot water, the water temperature is generally about 50 ℃, are low temperature hot water, and radiant floor heating water temperature is also generally required It is suitable to use about 50 ℃ water, and the lower the ground-source heat pump water temperature, the better its working performance and the higher the unit COP value. In this respect, the ground source heat pump technology and low temperature hot water floor radiant heating coordination work is suitable of. Figure 1 Ground source heat pump heating and radiant floor heating radiant heat load curve For the ground source heat pump heating in continuous normal operation, the heating capacity is stable, as shown in Figure 1 (1) line. The heating load required for building floor radiant heating is 24 hours a day, 365 days a year as shown in line (2) in Figure 1. How to make the heat supply of ground source heat pump to adapt to the change of floor heating is an important part of ground source heat pump used in low temperature and low panel radiation heating. In the literature (application research of variable frequency control technology in ground source heat pump air conditioning system) Ground-source heat pump inverter operation made a pilot study, and achieved good coupling effect. 3Economical Analysis of Ground Source Heat Pumps and Radiant Floor Heating The advantages of ground source heat pumps and radiant floor heating are described earlier in this paper but how their initial investment and operating costs and the actual effects of energy savings are an important part of rolling out this technology . 3.1 Ground source heat pump economic analysis For the ground source heat pump investment and operating costs of the author based on the literature and the actual project analysis and calculation as shown in Table 1 shows the contrast. 3.2 Low-temperature radiant floor heating of the economic analysis Low-temperature low-plate radiant heating system, its heat in the heat transfer process upwards, heat evenly and efficiently, no "cold feet Fever" feeling, nor bad breath of dry , Compared with the traditional radiator heating radiant floor heating, the operating costs and initial investment after the calculation and analysis, the results shown in Table 2. Table 1 Note: Table 1 operating costs per day by 10h, summer operation by 90 days, electricity prices by 0.53 yuan / kWh. As can be seen from Table 1, ground source heat pump operating costs savings of about 30% of the cost of operating air conditioning, while the initial investment increased by about 28%. Taking a building of 3,000 square meters as an example, the cost will be recovered in about 5 years (the service life of a typical air conditioner is about 15 years). Table 2 Note: Table 2, the building cost 4000 yuan / square meter, ordinary radiator per square meter accounts for about 0.02 square meters, operating costs per day 10h calculation, according to 100 days in winter, the price by 0.53 yuan / kWh. It can be seen that its operating costs can save energy by about 25% compared with ordinary heating. Although the direct investment is slightly higher than that of normal heating, the comprehensive decoration and the discount of the area of ​​the room make the floor radiation heating slightly lower. Table 1 and Table 2 can be drawn for the ordinary water-cooled central air-conditioning unit plus the fan coil used for its initial investment of 288.7 yuan / square meter, ground source heat pump and floor heating initial investment of about 323.3 yuan / square meter, Investment increased only 10.7%, while the reduction of energy conservation and operating costs up to 42.33%, apparently, the small increase in investment is well worth the effort. In addition ground source heat pump and low temperature hot water radiant floor heating system building fresh air is relatively easy to solve, good indoor air quality, easy maintenance, quiet and noiseless. Low temperature radiant floor cooling As the ground at low temperatures easily dew or even without condensation will make indoor air humidity, indoor environment deterioration, reduce indoor humidity is the key to using floor cooling in summer, but also the source Heat pump and radiant floor heating (cooling) the key to joint operation. The problem of reducing indoor air humidity and preventing condensation has been solved. 4 still need to solve the question
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