Study Of Public Building Energy Efficiency Evaluation System

Central air conditioning energy consumption accounts for a considerable proportion of public building energy consumption, so the research on energy-saving issues of central air conditioning is quite meaningful to building energy efficiency.Based on rough set theory, this paper proposes energy evaluation method for central air conditioning, since affecting factors of central air-conditioning energy are complex and uncertain. Firstly, taking the central air conditioning as the research object, this paper studies 15 factors that affect the energy assumption, including the central air-conditioning compressor, the coefficient of performance (COP), cooling capacity range, refrigerant, unit weight, volume control, loop number, brand, number of compressor units, cutting device, condenser , evaporator, control, dirt coefficient and noise factor, and identifies the main factors of central air conditioning energy-saving to be the compressor form, the number of circuit and control method. Secondly, the paper develops a study on a evaluation system of energy-saving of central air conditioning based on rough set theory by collecting 10 indicators of 11 brands as central air-conditioning energy saving evaluation data, and using the clustering method to quantify the specific target list of central air-conditioning energy into the abstract available decision table of rough set. Then we use the attribution reduction algorithm to obtain the attribution reduction of decision table, and extract and optimize the rules in decision tables according to the rules, certainty factor, coverage factor At the same time, an improved algorithm based on difference matrix has been proposed, and the algorithm takes full advantage of discernibility matrix, calculates the core of knowledge representation system quickly; based on the credibility of the weak reduction, reasonable rules have been acquired. Finally, public building energy efficiency evaluation system is developed by employing the system development tool VC + +, SQL Server, and COM components. The system has an interface to connect to a database, read the raw data, classify the raw data to quantify the discrete data, attribute reduction, attribute value reduction, identify and test samples and so on.This paper studies the energy-saving evaluation system of central air conditioning based on rough set, obtains the main influence factors of central air-conditioning energy saving, and provides a theoretical basis for the application of rough set theory on the evaluation of the central air conditioning energy-saving. The evaluation results of energy-saving air-conditioning through software show that rough set theory as a central air-conditioning energy saving evaluation system is effective and feasible.