Study On Hybrid Ground Source Heat Pump Mixed Liquid Desiccant System

With the energy shortage and environmental pollution,energy saving has become a major direction of social development.In the country's total energy consumption,building energy consumption accounts for about 30% of the proportion,and air conditioning energy consumption accounted for more than 50% of building energy consumption,therefore,reducing energy consumption has become a topic of concern.Indoor temperature and humidity control is the main task of air conditioning system.Common air-conditioning system is through the indoor into the treated air,relying on indoor air exchange to complete the task of temperature and humidity control,air conditioning system can use 15 ~ 18 ? high temperature cold source away from the indoor heat,but because of condensation dehumidification together with a common low temperature of 7 ? for processing,which caused the waste of energy use.In this paper,a series of studies are conducted on a temperature and humidity independent control system for dehumidification of solutions.In this paper,the author first modeled the various components of the hybrid ground source heat pump mixed liquid dehumidification unit system,analyzed the internal coupling relationship of each component,and established a computer with independent temperature and humidity independent treatment system simulation platform.Based on hybrid ground source heat pump mixed liquid dehumidification system office building demonstration project in the city of Chongqing,by comparing the test of the actual operation system with the established mathematical model,the author validates the heat transfer model,the heat pump unit model and the mathematical model of the dehumidifier unit.Secondly,using DesignBuilder to build the modeling,analysis of the building yearround load,and the mathematical model of the whole system is used to simulate the actual operation mode six years of the whole system.The temperature change of the wall of the buried pipe is analyzed,and the energy consumption of the system under different water supply temperature is analyzed and compared.Then,the mathematical model was used to simulate the two kinds of operation modes without using the control strategy.It was found that the two kinds of operation modes were running to the end of the sixth year,and the wall temperature of the buried pipe was higher than that of the original soil Many,can not guarantee the underground soil temperature balance,indicating that the system uses the necessary control strategy to maintain the system long-term operation and to ensure the balance of soil temperature.Finally,this paper presents different control strategies.Under the different control strategy setpoints,the system is simulated for 6 years.Based on the two aspects of the energy consumption and the buried pipe wall temperature,the optimal control strategy is obtained by comparing the operation under different control settings,and provide a reference for the actual operation of the project.In addition,the energy consumption of the system under different operating modes is also discussed.It is concluded that when the minimum fresh air volume is ensured,liquid desiccant units on moisture content operation is more energy efficient than the constant air volume operation.