Design Of Cold And Heat Source And Study On System Performance Of Energy Supply In A Certain Area Of Xiangtan City

At present,with the implementation of the national strategy for the development of new urbanization,the process of urbanization in China has been further accelerated,the contradiction between energy and environment has become increasingly prominent and get more attention.As building energy consumption occupies a larger proportion of total energy consumption in the society,one of the biggest energy consumption is air-condition,in the process of promoting energy-saving,emission-reduction and sustainable development of cities,how to reduce air-conditioning energy consumption has become a key issue.District cooling and heating technology plays an important role in this case.In the hot summer and cold winter areas of our country,there is abundant surface water resources,which provides good natural conditions for the application of water source heat pump technology.With the application and promotion of district cooling and heating system and water source heat pump technology in China,the water source heat pump technology of district cooling and heating system is very popular in the hot summer and cold winter areas,but at the same time,it is also faced with how to reduce the system energy consumption and the impact of environmental pollution and other issues.In this paper,a water-source heat pump cooling and heating system in a certain area of Xiangtan City is taken as the research object,using the building load simulation of Dest software to establish three typical building physical models such as residential,office and commercial,and calculate the area within the scope of buildings 8760 hours for the whole year hourly cooling and heat load.Combine with the annual load characteristics of the buildings,the summer and winter air conditioning system operating time is determined from from May 1st to September 30th,and November 15th to March 15th the following year.Aiming at the common water intake methods,it proposes two water intake schemes for water quality regulation and volume adjustment in the Xiangjiang River,and combines with the energy consumption composition calculation theory for the Xiangjiang water source heat pump system,compares the effects of different water intake schemes on system energy consumption,the total annual energy consumption trend of the system under different water intake methods shows that the optimal water intake method for the Xiangjiang water source heat pump system in the region:the water intake method adopts a temperature difference of ℃ for quantity volume in summer,and a temperature difference of 3 ℃ for volume control in winter.According to the optimized water intake parameters of the water source heat pump system in this area,the CFD computer simulation technology is used to simulate and analyze the water temperature of the source water pump and the average water temperature of the Xiangjiang River,the three-dimensional coordinate is established with the origin of the channel into the estuary.The results show that the temperature at the intake of the Xiangjiang River in summer is 31.1791 ℃,which is about 0.0091 ℃ higher than the initial temperature of Xiangjiang River,the temperature at the intake of the Xiangjiang River in winter is 13.9731 ℃,which is about 0.006 ℃ lower than the initial temperature of Xiangjiang Rivern In order to further reduce the water temperature,a combined water source heat pump and cooling tower system for the Xiangjiang River is proposed.The seasonal temperature of the cooling tower in the area is analyzed and predicted,also the energy consumption of the co-supply system,the extraction and drainage heat diffusion are performed.The calculation and simulation analysis show that the total energy consumption of the summer combined supply system is 31,194.60MW·h,which is about 269.22MW·h lower than that of the original Xiangjiang water source heat pump system;and the temperature at the intake of the Xiangjiang River is 31.1740 ℃.Compared with the original Xiangjiang water source heat pump system,the initial water temperature in the Xiangjiang River is increased by about 0.004℃.Compared with the original Xiangjiang water source heat pump system,the temperature of the Xiangjiang River is reduced by about 0.0051 ℃;The water area where the temperature of the Xiangjiang River has risen by more than 1℃ is 413.69m2.Compared with the original system,the area where the temperature rise in the waters of the Xiangjiang River has shrunk by 87.98%,and the temperature rise exceeding the standard area of the Xiangjiang River only accounts for 0.138%of the water area of the Xiangjiang River,the temperature range of the combined water supply system for the Xiangjiang River is further reduced.