[Abstract]: In view of the problems existing in the application of water source heat pump, ground radiant heating and air conditioning system in civil housing project, the control of room floor dew point temperature, the determination of floor surface temperature and the debugging during design and operation and commissioning The paper also discusses the relationship between the dehumidification system and the dew condensation on the floor surface. [Key words]: water source heat pump floor radiant floor heating and air conditioning system dew point dehumidification system 1 raised the issue for residential high heating costs, air conditioning a lot of power consumption, if only a set of public facilities, both to solve the winter heating but also In summer air conditioning, many research institutes and scholars at home and abroad made a large number of attempts and put forward many system solutions, such as using ground source heat pump, water source heat pump, air source heat pump, heat pump unit and fan coil heating and air conditioning system respectively. Furthermore, dual-end air-source heat pump air-conditioning system; there are winter and summer through the centralized treatment, the use of air duct air-conditioning system. The combination of the above methods, regardless of whether the air duct system or the fan coil is used, has some insurmountable disadvantages in energy saving, such as energy consumption problems of the blower coil and the fan coil of the unterminated unit, and noise influence of the fan coil Sleep problems; some users reflect the use of fan coil in winter, indoor air than other heating methods to be dry, and indoor dust larger, uncomfortable and so on. With the popularization of air conditioners in residential areas, the improvement of people's quality of life and the increasing demands on indoor air quality, many of the above problems have to face some new problems and assumptions, such as the comfort of human being due to temperature and humidity in the room, Energy saving and environmental protection, especially when choosing residential building heating and air conditioning, not only to meet the comfort of living room, but also consider the quality of life one-stop requirements, but also should consider the initial investment heating and air conditioning systems, annual energy consumption And costs, and in the initial investment and annual operating costs to find a balance between points and so on. Ministry of Construction Jian (2005) No. 26, has made it clear the importance of ground source heat pump, water source heat pump heating air conditioning in the construction of the promotion and application of the importance of the same time put forward the water source heat pump in the field of construction scale, not only can improve natural resources Use of efficiency, but also save energy while protecting the environment, so that research and application of water source heat pump will enter a new phase. On this basis, many domestic enterprises are exploring water source heat pump and supporting energy-saving devices - water source heat pump and ground radiation heating and air conditioning systems. For example, the international front apartment in Beijing, the first successful use of residential area ground cooling and fresh air replacement dehumidification, to ensure the room temperature and humidity requirements, and some homes, the use of some small test equipment, to carry out small-scale tests in order to achieve winter heating The purpose of summer air conditioning. So far, the development of this achievement has not been able to promote the use of large-scale residential buildings in China. In particular, the research on this topic is of particular importance. Therefore, according to this subject with the actual project for research and implementation, the current winter and summer equipment is operating normally, energy-saving data to be published after the summary. 2 Project Overview The project is located in a city of Hebei Province, developed by real estate companies with commercial facades, office and residential buildings as one of the integrated building with a total construction area of ​​about 9,000 square meters. The first to second floors of the building are commercial facades and are let to be rented independently. The third to seventh floors are integrated office buildings and 24 sets of residential buildings. The building is a brick-concrete structure with a 370mm brick wall on the façade and a large glass screen on the front, Layer height of 3.6 meters, the rest are 3.3 meters. The project was commissioned and started construction in early 2003 and completed by the end of 2004. The water source heat pump and the terrestrial radiation heating system have been put into operation in winter and the water supply and cooling system in summer 2005 has been put into trial operation. The technical implementation is based on the water source heat pump system for technical improvements, with ground radiation heating principle, to achieve the winter heating, summer air conditioning, cold and heat source integration. $$ Div $$ 3 Determination of cold and hot source equipment Water source heat pump technology has been widely used in many countries in North America and Europe. It uses shallow water on the surface of the earth to transfer heat at low temperature to high temperature and water, And stratum energy storage respectively as the heat source of winter heating and the cold source of summer air conditioner, take out the heat in the formation water in winter and release the heat through the evaporator of the heat pump unit so that the building can achieve the purpose of heating. In summer, heat is absorbed by the condenser of the heat pump unit so that the building can be air-conditioned and a set of equipment can replace both the original boiler and the cooling unit. As we all know, water source heat pump energy utilization, its energy efficiency (COP value) 1 kilowatt of electricity can be 3.5 ~ 4.6 kilowatts of cooling and heating energy, air conditioning than the 40% higher, operating costs lower than air-conditioned 40 In addition, the shallow surface of the Earth's surface water temperature constant, perennial can maintain 14 ~ 16 ℃ constant temperature water, so water source heat pump unit operation is stable and more reliable. Water source heat pump system is very significant environmental benefits, the device is not burning, not only reduces emissions of greenhouse gases and other emissions of CO2 emissions, while it is compared with air-source heat pump, the equivalent of 40% reduction in emissions, and electric heating Compared to a reduction of 70%. Therefore, not only the water source heat pump environmental benefits is very significant, while it is in the building heating and air conditioning is a sustainable development of new energy-saving building technology. According to foreign experience, due to the low operation cost of water source heat pump system, the increased investment can be withdrawn within 7 years, meanwhile, the average cost of water source heat pump system during the whole service cycle will be lower than that of the traditional air conditioning system. In summary, the building has residential, commercial and office space, there should be winter heating and summer air conditioning requirements. At the same time should consider the use of the building features and the possibility of different use factor, the summer air conditioning needs in the building should be adjusted. In addition, the building is located in the groundwater resources are very rich, the local geological engineering department conducted a field exploration, and the soil was gritty easy to recharge. Therefore, through the comparison of several cold and heat source system schemes, and taking various factors into consideration, it is confirmed that the direct source system of water source heat pump is selected as the cold and heat source equipment. 4 Heating and air-conditioning design 4.1 Cold and heat load calculation The cooling load calculation includes the heating of the lighting, personnel and electrical equipment. The calculation results of hot and cold load are shown in Table 1 below. Table 1 Calculation result of hot and cold load Name Cooling load (kW) Heat load (kW) One to two storey 387.2 314.7 General office 256.0 221.5 Residential 108.7 88.6 4.2 Determination of supply and return parameters Winter floor heating 50 ℃ hot water supplied by water source heat pump , The return water temperature is 40 ° C. In the summer overdue season, 13-16 ℃ deep well water is directly supplied by the water pump, dehumidification and part of the time by the water source heat pump to provide 7 ℃ chilled water, return water temperature is 12 ℃. 4.3 Heating and air conditioning surface temperature 4.3.1 The average temperature of the ground heating surface design The surface temperature of different decorative materials comes from the human foot directly with overheating and cold surface contact with the object, the design reference international standard ISO7730 , For people who do not exercise indoors, room temperature should be between 19 ~ 26 ℃, 29 ℃ is the surface temperature of the floor heating system limits; EU CEN recommended surface heating temperature, according to the degree of comfort can be divided into three levels, A level is highest, B and C level is low.Therefore, surface heating temperature is determined according to different levels of comfort, heating surface temperature range shown in Table 2. Table 2 Heating on the ground surface temperature range of selected Vertical temperature difference Heating surface temperature range A ≤ 2 ℃ 19 ~ 29 ℃ B ≤ 3 ℃ 19 ~ 29 ℃ C ≤ 4 ℃ 18 ~ 31 ℃ Table 2 shows that the ground surface temperature of the radiant floor heating system is 19 ~ 29 ℃. 4.3.2 Average surface air temperature for cooling The following is a list of summer cooling system conditions: 4.3.2.1 Indoor air temperature should be less than 26 ° C. 4.3.2.2 cooling, the average surface temperature should not exceed 19 ℃. 4.3.2.3 The temperature difference between the foot and the head (from 0.1 to 1.1 m) should be below 2 ° C. 4.3.2.4 The absolute humidity of the air should not exceed 15g / Kg. 4.3.2.5 The average temperature of the ground surface temperature is relatively small on the indoor vertical, but the main heat transfer by radiation, the data in Table 3. Table 3 Water temperature and vertical temperature difference Water temperature (℃) 20 18 14 12 10 0.1 ~ 1.1m Temperature difference 0.5 0.5 0.5 0.4 0.4 As shown in Table 3, for a person sitting in a chair, the height from 0.1 ~ 1.1m Between the temperature difference is less than 0.4 ~ 0.5 ℃ provided
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