ASHRAE 4691-2004
HVAC-KBCD 的开发和实施：基于知识的 HVAC&R 系统概念设计专家系统 第1部分：总体框架

Development and Implementation of HVAC-KBCD: A Knowledge-Based Expert System for Conceptual Design of HVAC&R System - Part 1: General Framework

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标准号

ASHRAE 4691-2004

发布

2004年

发布单位

ASHRAE - American Society of Heating@ Refrigerating and Air-Conditioning Engineers@ Inc.

当前最新

ASHRAE 4691-2004

 

 

适用范围

"The typical HVACR design process involves generating a relatively small number of alternative solutions (conj??gurations of systems@ subsystems@ and components) and then utilizing analysis and estimation tools to select a ""best"" solution based onpredej??nedselection criteria@ for example@ lowest lifecycle cost. This approach is limited by the engineer's experience@ capabilities@ and time constraints@ often resulting in missed opportunities for optimum system selection. Further@ the latest equipment@ design approaches@ and concepts are often not even considered. As a result@ the overall design process is being gradually compromised. A knowledge-based expert system (KBES) can augment the capability of current advanced building simulation tools by creating the necessary means for automatically generating@ analyzing@ and sorting numerous design solutions subject to both site and user constraints. This paper describes the general framework of such a KBES called HVAC-KBCD (knowledge-based conceptual design)@ capable of automatically synthesizing the complete set ofpossible HVACR systems@ which can then be analyzed using available building energy simulation programs such as DOE-2.1 E. This synthesis is done byjrstpruning or shrinking the solution space of the design alternatives by applying static expert knowledge (Level I ) and then by a guided search dominated by dynamic application knowledge (Level 2). Level 1 starts with a database of all feasible secondary systems (and another for all feasible primary systems) and uses assembly rules and application rules based on heuristics expert knowledge@ design practice@ and standards to generate the permissible design alternatives of secondary systems (and primary systems). Level 2 uses initiation rules along with matching rules to combine secondary systems among themselves (since the building has diferent zones) and with primary systems. These capabilities have been programmed into a commercial hybrid k3ES shell along with procedural programming capabilities that have the ability toperform simple heuristic cooling and heating design load@ as well asJirst and maintenance cost calculations. ANSI/ASHRAE/IESNA Standard 90.1-2001 has been used to set the minimum allowed energyperformance for equipment such as fans@ chillers@ boilers@ etc. This paper describes the general framework@ structure@ capabilities@ and inner working of the HVAC-KBCD@ while a companion paper will illustrate and demonstrate the entire methodology described here to the conceptual design of office buildings."

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