| As a form of renewable energy, river water source heat pump, which getting the cooling and heating capacity stored in water, has advantage of water saving, power saving, and reducing pollutant discharging; cooling tower as a tranditional cooling device has obvious superiority when use in the air temperature is lower.So combined of the two technologies can give full play their respective strengths, achieve the rational optimization of resources and maximum system efficiency, economy, energy saving.In this study, research on several key technical problems of river water source heat pump hybrid system ,so provide the theoretical basis for hybrid system's efficiency and economic operation and offer reference for engineering application. We do a full range of categories of hybrid systems of water source heat pump, and describe the application of various systems in the form.; analysis of the hourly external conditions impact of river water source heat pump system efficiency and conventional cooling tower system efficiency; based on priority of energy efficiency principle, comparative analysis the two kind system, calculation formula of relative energy saving critical temperature difference to general system under different loading rates is derived; considering the hourly river temperature, hourly outdoor air's wet bulb temperature, hourly water height and hourly rate of part-load, following the best matched concept of building air conditioning load supply side and the demand side, first put forward load sharing proportion of hybrid system of water source heat pump for four kind of architecture; based on the classification of hybrid water source heat pump system, consider economic factors, technical factors, environmental and social impact of various options,use fuzzy analytic hierarchy process choose reasonable system solutions; according to a river water source heat pump and cooling tower system, under the cooling tower 50% load allocation proportion put forward six may optimal control strategy and programming calculation and analysis using matlab.The results show that: Water source heat pump systems can follow the form of auxiliary system, mode of action, role position, combinations, etc. and in engineering applications load side and the heat source side in parallel are more; establish typical model using DEST to analyze the load characteristics of different construction end and analyze of Chongqing river temperature, water height, hourly air temperature, providing basis for system load and enery dynamic coupling analysis; river water source heat pump energy-saving critical temperature relative to water height and part-load ratio, based on the intake pump frequency limit, for 0.7 <PLR <1 and < 0.5 <PLR <0.7 were derived from a different formula; according the annual "50h does not guarantee rate" the load ratio of auxiliary system to bear slightly different according to different buildings, which house 0.2 to 0.4, office: 0.28 -0.58, shopping malls :0.48-0.68, hotel 0.4-0.6; According to FAHP, the weight coefficients of five kinds of programs were 0.1803 for the conventional system, Ground Source Heat Pump, 0.193 for water source heat pump, 0.2172 for WSHP and GSHP, 0.2106 for GSHP and cooling tower, obtained hybrid system has a higher weight factor, the program may give priority to applications; for river water source heat pump hybrid system may six best control strategies were programmed calculation and analysis, come to the hotel, residential air conditioning systems, etc. need to be open all day have more obvious advantages of hybrid systems; Energy consumption by unit and distribution system double impact, the best coupling of case study between the two points: heat pump 79.01%, transmission and distribution system20.99%; Six kinds of control strategy, the best energy-saving is dynamic control strategies, energy-saving rate of 8.49%, temperature control strategy 3 ( t r- t w> 2 on auxiliary systems) are also have well energy saving effect, energy-saving rate of 7.67%.This study shows that hybrid river water source heat pump technology has application value, can solve the problem of low system efficiency cosed by Large taking water elevation and low part-load in the early summer and late summer period... |
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