The Development Of Control Device For Water System Of Ground Source Heat Pump

With the high-speed development of economy, social consumption of energy is increasing. The risk of energy shortage has become more and more obvious. At the same time, environmental concerns are also growing, the use of traditional energy sources of coal, oil can produce a large amount of harmful gases and greenhouse gases. Coal, oil are non-renewable energy resources, and reserves are limited, with a gradual increase in production and usage, resource exhaustion is just a matter of time. Under the background of energy crisis, the development of renewable energy gets more and more attention of the countries all over the world.Shallow geothermal resources are clean, non-polluting, renewable sources of energy, development of shallow geothermal resources is beneficial to environmental protection and economic development. Ground source heat pump is one of the most important forms of development of shallow geothermal resources, which is the most common form currently. Ground source heat pump with the advantages of high efficiency, energy saving, environmental protection has been more and more widely used, our country gives strongly support from the aspects of policy and economic.In this paper, a intelligent control device was designed for water system of buried pipe ground source heat pump, the reason why for the water system, because in the ground source heat pump system, water system accounts for a large part of the energy consumption, optimization of the control of water system has a positive meaning to improve the efficiency of ground source heat pump system. The control device provides a platform for optimal control of water system of buried pipe ground source heat pump, using the platform various of optimization algorithms can be verified. In this paper, the research work can be summarized as follows: 1. First of all, the CAN bus communication node was designed based on STC12C5A60S2single chip microcomputer as control core. The node can communicate using the CAN bus, In order to connect the traditional RS-485communication interface instruments to the CAN communication network, the node has a CAN to RS-485commutator. The node can convert the CAN communication with the wireless communication. Secondly, the data acquisition and control modules are designed, including A/D conversion module, D/A conversion module and digital input and output module.2.Designed the system underlying drivers, including CAN communication driver, RS-485communication driver, wireless communication driver, A/D conversion driver, D/A conversion driver, digital input and output driver and a series of underlying driver softwares.3.Based on the designed hardware and driver softwares to build the CAN bus communication network, completed the data acquisition nodes and control nodes in the deployment of water system of ground source heat pump.4. A host computer program based on ARM9and embedded Linux operating system had been designed, completed the Linux operating system kernel configuration and system transplantation. Using Qt/Embedded class library for the design of the graphical user interface. A PC software was developed based on VB.NET, monitoring the field data through wireless.5. Based on the field data collected from the water system of ground source heat pump, using the left semi-tensor product of matrices to construct the fuzzy relationship model of buried pipe heat exchanger, and the model was validated.6. Summarized the whole process of the research, analyzed the inadequacies of the system and the improvements to the system was discussed.