Energy Efficiency Optimization Of Central Air Conditioning Water Systems In A Hospital

With the rapid development of economy and the construction of our country urbanization,more and more public buildings existed.The building energy consumption accounts more and more proportion of total energy consumption,which distribute to one of the core content of sustainable development strategy on building energy saving problems in our country.This assignment focused on energy efficiency optimization of central air conditioning water systems in a hospital.First of all,the assignment expounds the consumption of hospital central air conditioning water system;analyzes the central air conditioning system in some existing problems in management.As a result,we found several problems,e.g.‘large flow,small temperature difference’;low degree of automation;lax management;unreasonable operations;et,al.According to the current situation of the issue in our country and abroad in air conditioning energy conservation,optimizing algorithm and related management tools,coming up with the optimized solutions on the basis of proposed DMAIC water system energy consumption,and clear the specific work scope of the project through the work breakdown structure(WBS).Secondly,determine the assignment to improve the object for the process P through the SIPOC analysis,using the methods of brainstorming,fishbone diagram analysis,failure mode analysis(FMEA),and other management tools,and resolutely,finding out the five main factors which would influence the energy consumptions on central air conditioning water system.These factors including unreasonable unit switch machine;frozen water side steady flow;cooling water side steady flow operation;state of the unit bypass valve;water distributor and water collector valve status.Then,through the improvement process,using traditional analysis methods to solve the first three factors,and adopted the quick win methods to improve the last two factors easily.In specific,firstly,reformulated the order of the system load units,and optimized the operating mode by the system ratio;secondly,frozen water side of chilled water in secondary pump variable frequency renovation,determined to set the main differential pressure as frequency conversion control signal,calculated the variable flow secondary pump group after the operation of the energy-saving rate,which shows the energy consumption of the pump group sets operation switchpoint through comparison;cooling water side of the variable flow water system renovation to make sure to set the water temperature of cooling water for the frequency conversion control signal,under different temperature range is given by the corresponding specific frequency values and set the lower limit frequency,and calculate the cooling water pump frequency conversion water system in the overall energy saving rate.The valve is equipped with an electric valve and sets interlock to ensure that there is no abnormality on the side of the unit.The water distributor and water collector valve would increase the statues indicator plate to reduce the error operation caused by human factors.By comparing and analyzing the total energy consumption of the central air-conditioning water system,the improved energy saving rate is 19.7%,which proves the effectiveness of the improvement measurements.Last but not the least,according to the perspective of management,this assignment gives the control suggestion on the central air-conditioning water system to maintain the low energy consumption,and establish the scientific and reasonable operation management system,and come up with the intelligent management mode.Through computer aided building IFIX intelligent integration platform,combining different equipments and subsystems,and unifying management to achieve a maximum level on data sharing,automatic control,scientific decision-making,and cross linkage system.