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Research on Dynamic Character of Open-loop System Surface Water Source Heat Pump System

Author: HanChuanZuo
Tutor: WangYong
School: Chongqing University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Open lake water source heat pump Dynamic Heat Capacity Water temperature limits Saving rate Coupling
CLC: TU831.3
Type: Master's thesis
Year: 2010
Downloads: 215
Quote: 5
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Abstract

With China's rapid industrial and economic development, and environmental and energy issues increasingly serious surface water source heat pump system in recent years more and more attention and application. China has abundant surface water resources, especially in the south of the Yangtze River and the vast areas of lakes, ponds, reservoirs, rivers and other surface water resources are very rich, for our country to develop surface water source heat pumps have great significance. At present, a lot of use of lakes, ponds, reservoirs, rivers and other surface water bodies of surface water source heat pump system in China has begun to put into use, which works mostly open system. However, due to the lack of theoretical research and practical experience in engineering deficiencies, the actual operation of the system in a variety of problems occur and eventually cause the system to run without saving phenomenon. For water retention, cause the system not energy has two main factors: one is the water temperature and water quantity, another important factor is the water consumption. Determining a surface water source heat pump system should be considered whether the energy and water consumption water temperature optimum coupling values. For the flow of water, causing the system does not run water saving is the main factor determining the program, including water elevation, water methods. This article focuses on depth of 4 ~ 10m to the surface of shallow water bodies as the research object, for open surface water source heat pump system, its dynamic operating characteristics are analyzed and studied. The main research contents and the main conclusions are as follows: For stranded in shallow surface water bodies is low cold surface water source heat pump system open: ① stranded in shallow surface water bodies as the research object, the basic equations of fluid motion in the N- S equations based on the use of water temperature, mass and energy equations established open-source heat pump system uses surface water body two-dimensional mathematical model of temperature change, and the use of numerical methods for solving the water temperature to obtain the numerical solution. ② stranded in shallow surface water bodies as the research object, respectively, of summer and winter surface water source heat pump system dynamic temperature distribution analysis. According to the established model of dynamic two-dimensional temperature and architectural annual hourly load values, respectively, and average hourly parameters of water retention parameters to calculate the dynamic changes in water temperature in summer. Compare the results obtained with respect to the hourly load parameter values, the average load parameters on the temperature distribution of the deviation of the results is not significant; relative to hourly meteorological parameters, the average meteorological parameters on the deviation of the results was significant. Therefore, it is recommended for surface water temperature for dynamic analysis of hourly meteorological parameters as far as possible, in order to improve the accuracy and reliability of the analysis. ③ The winter water temperature limit is based on the winter residence of the maximum heating capacity of the water were analyzed. Solved in the heating system and the different characteristics of different loads during the initial temperature water body can withstand a maximum discharge cooling capacity. By regression method to obtain hot water and water carrying capacity as a function of characteristic parameters. And through practical projects to test the calculation results obtained its reliability. ④ Based on climatic conditions in Chongqing, the article analyzes the rains were stranded on the water surface temperature distribution and heat carrying capacity of water bodies affected; through the analysis of rainfall run off water source heat pump system, the impact of energy consumption, heavy rainfall mainly derived input cold a way that the water temperature lower the overall and measured to obtain rainfall before and after unit running average energy efficiency ratio were 3.29 and 4.35, the system efficiency relative to the rainfall was increased by 32.3%; drizzle and showers mainly in the disturbances in the form of the water body upper and lower temperatures and , no significant effect on the unit energy consumption, but to accelerate the water layer (water bottom) temperature rise speed. Finally on lake water source heat pump system efficiency analysis, we must fully consider the local climatic conditions. All surface water for all the open ground source heat pump system: ⑤ practical projects for the current prevalence of excessive energy consumption system operation conditions in the water source heat pump energy consumption model, water consumption models established on the basis of the open type of surface water source heat pump system energy consumption coupled model. Energy saving rate based on the laws and pump characteristics calculated with different cooling tower water temperature, different water pump head, the dynamic water temperature limits established open-source heat pump dynamic water surface temperature limits are calculated. And calculated under different conditions of surface water source heat pump system is relatively conventional air conditioning energy saving rate. Satisfying the water carrying capacity of the water source heat pump system for energy efficiency are analyzed, draw heat carrying capacity of water is not guaranteed energy source heat pump system only indicator, the system's energy efficiency is the water temperature and water energy coupling results . ⑥ Chongqing as an example of a practical project, the project is open in summer surface water source heat pump system operation made a detailed testing and analysis, and the system as a low heat source artificial lake carrying capacity of the thermal analysis , arrive at the lake body heat carrying capacity is low; and summer energy and energy efficiency systems were analyzed. Eventually come to its design and operation of the deficiencies and proposed improvements, and for other similar projects learn to play the role.

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