| Building energy consumption has become our country energy consumption three big one of the "energy". At present, the building energy consumption is about 30% of the total energy consumption. Has nearly 40 billion m2 building in our country, of which 99% for high energy consumption construction, and construction for more than 95% of new buildings are high energy consumption. Organ office buildings and large public buildings in China area is less than the town a total construction area of 4%, but the amount of annual power consumption has accounted for the town 22% of the total power consumption, annual power consumption per unit area as much as ordinary residential 10 ~ 20 times. On the other hand, building energy consumption accounts for about 27.4% of the total energy consumption society in our country, and air conditioning and heating energy consumption accounts for about building can always be 50% ~ 70%. High energy consumption of large-scale public buildings, this kind of building energy-saving renovation work become the focus of current building energy efficiency.In this paper, a office building in Chengdu as the research object, first against the original central air conditioning system operation process Small temperature difference "in" big flow problems, the original air conditioning system test, the test mainly aims at the office building air conditioning heating system operation condition, finally, the running time of the hot water temperature difference to determine, verify the air conditioning system exists problem of "large flow of small temperature difference", and the office building reconstruction of the energy saving of air conditioning water system shall be used as the key.Based on the "breakdown of energy consumption data acquisition technology guidelines," according to the office building electricity meter installation location, the power of the office building HVAC, lighting socket electricity, electric power consumption and a special area of four parts conduct energy classification statistics; but also on each floor were stratified consumption statistics. First of all the office buildings every year, month by month total building energy analysis, the floor of the office building to teach energy characteristics and overall building energy intensity per unit area and analyze its causes; and overall energy consumption values and the office building building energy intensity per unit area and elsewhere in the country the typical architectural contrast, that the overall energy consumption of office buildings in a more reasonable range, but written with Tsinghua University, "China building energy annual Development report" in 2014 can consumption leading value there is a gap. Show that there are still some energy saving space.Based on tests of the office building to teach central air conditioning system operation and energy consumption data through the system operating conditions to quantify the diagnostic index analysis, energy efficiency, air-conditioned terminal operating efficiency, and operating efficiency of the air conditioning heating system from the hot water boiler operating efficiency, the pump delivery other aspects of the air-conditioning system operating conditions for diagnostic analysis, the study found that the office building air conditioning hot water boiler heating system efficiency, air-conditioned terminal operating efficiency and operating efficiency of the entire air conditioning heating system values are in line with regulatory requirements, only the system thermal water circulation pump delivery specification is far greater than the value of energy efficiency, energy-saving recommendations.After a typical project by the host system in Chengdu and air conditioning supply and return water treatment tank supply and return water flow and temperature testing, found the whole pipeline system did not perform well due to commissioning work, resulting in a total system impedance is greater than the design value, the system water flow is less than design flow, further resulting in insufficient system capacity, high temperature load area. It can be that the system should be used as transmission and distribution system commissioning operation and management of the primary evaluation process. Its main measure should be considered to balance the rate of transmission and distribution systems, network traffic, hydraulic imbalance degree(ratio of the actual cooling capacity and design of cooling capacity) as well as energy efficiency delivery system.Finally, the high energy consumption of the office building of new wind generating units, it is recommended to take fresh air room 20m3 /(h ? p), and adjusted in accordance with the indoor carbon dioxide concentrations less person in the room when the carbon dioxide concentration is very low, the fresh air of the smallest value can not be less than 10% of the total air volume systems; in view of the high office building air conditioning system circulating water pumping energy analyzes are compared with air conditioning hot water circulation pump in the case relative to the fixed-frequency inverter savings in electricity and energy-saving rate; Chengdu by the typical cooling system test engineering analysis, system commissioning work should be used as transmission and distribution system operation and management during the primary evaluation. Its main measure should be considered to balance the rate of transmission and distribution systems, network traffic, hydraulic imbalance degree(ratio of the actual cooling capacity and design of cooling capacity) as well as energy efficiency delivery system. And against the prevailing air-conditioning water system problems, proposed evaluation method to optimize water system should be a complete dynamic evaluation process, and a detailed analysis of how many were from the energy, economy and reliability judge.Finally, the first use of air conditioning system design pattern and the degree of deviation of actual operation system, to find the air conditioning system fault direction, then fault diagnosis method based on fuzzy reasoning, according to the membership value to find out the possible causes of the failure occurs... |
PDF Full Text Request