Air source heat pump hot water unit as well as many advantages such as high efficiency, energy saving, environmental protection, easy installation and use, etc., are recognized and used by hot water or heating users in China. The actual survey shows that most foreign introduction of units to varying degrees to show the hot and humid climate in the middle and lower reaches of Yangtze River in China acclimatized, and domestic air-source heat pump manufacturers in the traditional use of air-conditioning heat pump units in operation more than the upper limit of water temperature rise is not high, Wherever he likes. With the spirit of continuous innovation and the advantages of cooperation with Shandong Institute of Construction and Engineering, Jinan Longpu New Energy Co. actively makes use of the accumulated scientific and technological achievements and high-level scientific research strength in its heat pump research and invests a large amount in the original experimental equipment and workbench Funds, enriching the air source heat pump hot water unit and heat pump air conditioning water heater test and inspection equipment, research and development of air source heat pump hot water unit automatic control technology; determine the heat pump system two heat exchanger design methods and computer programs; Developed conditions simulation software and engineering design software to simulate any conditions in different regions, which developed and adapted to China's specific regional climate conditions of air-source heat pump products. Heat pump hot water unit product testing standards have passed the technical supervision Bureau standards validation, filing. The quality supervision and inspection department tested the LPRB2.2D175 heat pump hot water unit at a temperature of 20 ° C and a relative humidity of 57%. The energy efficiency COP value was 3.9. Shandong Provincial Energy Utilization Monitoring Center of LPRB-3.8D300A type heat pump hot water unit testing, COP value of 3.7, and stable operation. Shandong Science and Technology Department at the end of 2003 organized thermal energy, machinery, HVAC, automatic control and other related industry experts on the Long Pu air-source heat pump hot water unit conducted a serious and comprehensive site survey, agreed that: the key technologies reached the leading domestic Level, to fill the gaps in the domestic product has good economic, social, environmental benefits, it is recommended to further accelerate the industrialization and application of the technology. Jinan Longpu New Energy Co., Ltd. adhering to the environmental and energy-saving two major global body, with the joint school-enterprise technical support, continue to introduce mature products and services to speed up the cultivation and development of the market, the product packaging design, construction technicians The products have been applied all over the country. The projects have covered many provinces in Guangdong, Guangxi, Yunnan, Guizhou, Fujian, Hubei, Hunan, Shandong, Henan, Liaoning and so on. Jiangxi, Shanghai, Jiangsu, Zhejiang, Shanxi, Hebei, Anhui, Beijing, Shaanxi and other places æ¥äºº visits to discuss cooperation and promotion in an endless stream. Existing engineering applications involving hotels, schools, hospitals, residential area, factory workers bath, highway service area, build clubs, leisure centers, sauna clubs, business villas and so on. Jinan Longpu New Energy Co., Ltd. for the use of new energy achievements and social contribution to environmental protection and energy relief are gratified. In order to better summarize the actual operation experience of air source heat pump hot water unit in engineering applications, improve the overall technical level, to provide users with more reasonable design services. In recent years, many examples of projects selected by Longpu Company for 80t centralized hot water project in Lihuayi district for example analysis. Lihuayi district is located at latitude 37 ° 29'N, longitude 118 ° 14'E and +12 meters above sea level. The average temperature in January is -2 ℃ -3 ℃ in summer. The average temperature in summer is 29 ℃, and more northeasterly winds and the annual frost-free period is 267 days There are 29 residential buildings in residential area and 6 expert villas, covering an area of ​​139,500 square meters with a total of 518 households and an existing resident population of 1,780. Residential water supply network supporting facilities, new construction is the use of coal-fired boiler for heating and domestic hot water. After the change to steam heat transfer heating, at the same time get 45 ℃ ± 3 ℃ condensate for residential life with hot water. The original 300 tons of insulation tank 10 ㎠rockwool insulation layer, an increase of 5 ㎠polyurethane foam insulation, plus galvanized iron protective layer, inner wall brushing fiberglass lining, in order to ensure water quality and jerry can not be eroded. According to the requirements of the demand side daily production of 55 tons of hot water 80 tons, the demand side to provide the relevant data into the computer simulation software, the hot water system to meet the practical requirements should be equipped with Long Pu air source hot water unit input rate 89.78KW , The average annual energy consumption per ton of hot water 6.73 yuan (local 0.62 yuan / KW · H) budget proposal reported to the project headquarters to study and research, to obtain the same heat, different forms of heat exchange and energy consumption Compared with the cost comparison (see Figure 1), the solar energy and air source heat pump are the most economical and environmentally friendly. However, in view of the harmonious unity with the afforestation environment of the residential area, the prominent contradictions of the solar energy project are that the installation area is too large, Large quantities, long installation period, follow-up maintenance costs, inconvenient property management and other factors, March 25, 2004 program final selection Longpu air source heat pump hot water unit. On the 26th, Longpeng Construction Technology Chief Engineer personally visited the site to test detailed construction drawings. According to the installation space required by the purchaser and the arrangement of units, the hot water system selected 24 units of LPRB-3.8D300A model with the following technical data: Category Project Name Unit Value Unit Technical Parameters Item Hot water outlet temperature 0C 60 Rated heating capacity KW 13 Rated hourly heating capacity (with ambient temperature) L / h 282 Rated input power KW 3.75 Installation conditions Water Dimensions mm 1420X1400X400 Net weight Kg 240 Rated Water pressure Mpa 0.6 Maximum water pressure Mpa 1 Pipe diameter - DN25 Operating conditions Electrical voltage V 3 ~ / 380 ± 10% Frequency of use Hz 50 Maximum current A 15 Grounding requirements Ω Temperature Ambient temperature range 0C -5 ~ 40 Through the transformation branch Network diameter, adjust the circulation flow. High temperature hot water within the heat exchanger of the unit is forced to circulate through 2 sets of hot water circulation pumps (one with one preparation and one preparation) and low temperature hot water within 300 tons of insulated water tanks. The system adopts automatic control technology to realize system automation and the water temperature and water level display can be set Any temperature water supply, the actual use of water temperature set at 52 ℃. The temperature difference tracking automatically circulates the water in the 300-ton water tank to heat it. When the water temperature in the hot-water storage tank reaches the set value, it automatically stops at 55 ° C. 300 tons of water tanks after the implementation of closed-loop water supply lines, water terminals that both open hot water; low water level control point design at 200 tons of water level, the use of hot water below this level, the system intelligent control tap water, So that cold water into the heat pump unit, after heating the non-constant temperature water into the 300 tons of jugs, the water level rises to the maximum warning level, at this time due to the lower temperature of the water into the hot water tank, so that the water tank temperature below the set Set the temperature of 52 ℃, the host system starts to work, cycle heat to 55 ℃ automatically stop running. Each building user practical hot water has 300 tons of insulation jugs, storage tanks all day not less than 200 tons minimum water level alert, to ensure that 24 hours of hot water use, hot water pipe network circulating pump intermittent cycle. The temperature control point is designed to be 200 tons water level in 300 tons thermal insulation water tank, when the temperature is lower than 52 ℃, the system starts up and runs, thus completes a work process. Special circumstances increase the amount of water can be achieved automatically switch the system, strong controllability. On April 10, 2004, the host equipment entered the construction site for only 7 days of intense construction. The whole system was commissioned on the 18th. The engineers and technicians of both sides adopted the single-machine sampling and the COP value of the system during the operation to measure and test the hot water project The data are as follows: No. Water temperature ℃ Ambient temperature ℃ Working time min Hot water temperature ℃ 3 18 22 7 / 9.5 48/65 19 18 22 7/10 48/65 14 18 22 7 / 9.5 48/65 20 18 22 7/10 48/65 heating unit heat exchanger 35kg of 18 ℃ cold water, the measured results as above Total heating = 35kg × (65 ℃ -48 ℃) × 1Kcal / kg · ℃ = 595 Kcal Average power consumption equivalent calorific value = 3.75kw × {9.5 min + 10 min ÷ 2-7 min} ÷ 60 min × 860 Kcal / kg · ° C = 147.81 Kcal COP value = Total calories ÷ average calories burned = 595 Kcal ÷ 147.81 Kcal = 4.03 The entire system is pressure tested and rinsed After the completion of a one-time injection of 300 tons 18 ℃ tap water, began trial operation, starting at 10:10 on the 18th start running until 11:20 pm on the evening of 19 minutes storage tank temperature to 55 ℃ set temperature, the system automatically shut down. Time-consuming 37 hours and 10 minutes, the total power consumption of 3515.50KWH. Taking into account the lower ambient temperature and pipe network and the heat sink and other factors, the comprehensive calculation of COP value reached 3.88. In the actual use in the future, the unit will work ten to twelve hours a day, which can guarantee 80 tons of hot water above 50 degrees for all utilities. The demand side is very satisfied with this result. Since this project successfully completed the acceptance of the transfer. At present, the air source heat pump market unprecedented prosperity, heat pump technology can improve energy efficiency, is a model of rational use of energy has become a recognized fact in the industry, the experts predict the application of heat pump technology will enter the second revolution, our country is an energy source The shortage of countries, that is, the maximum possible use of energy is the common goal of building a moderately prosperous society
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