Abstract

An inappropriate indoor climate, mostly indoor temperature, may cause occupants’ discomfort. There are a great number of air conditioning systems that make it possible to maintain the required thermal comfort. Their installation, however, involves high investment costs and high energy demand. The study analyses the possibilities of limiting too high a temperature in residential buildings using passive cooling by means of ventilation with ambient cool air. A fuzzy logic controller whose aim is to control mechanical ventilation has been proposed and optimized. In order to optimize the controller, the modified Multiobjective Evolutionary Algorithm, based on the Strength Pareto Evolutionary Algorithm, has been adopted. The optimization algorithm has been implemented in MATLAB®, which is coupled by MLE+ with EnergyPlus for performing dynamic co-simulation between the programs. The example of a single detached building shows that the occupants’ thermal comfort in a transitional climate may improve significantly owing to mechanical ventilation controlled by the suggested fuzzy logic controller. When the system is connected to the traditional cooling system, it may further bring about a decrease in cooling demand.

Highlights

  • Buildings account for about 40% of the global energy consumption [1,2,3] and contribute to over40% of the total world CO2 emissions [4,5]

  • The main goal of this paper is to develop and test a control system for passive cooling based on mechanical ventilation using ambient cool air

  • The fuzzy logic control (FLC) was optimized for two different cases

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Summary

Introduction

Buildings account for about 40% of the global energy consumption [1,2,3] and contribute to over. 40% of the total world CO2 emissions [4,5]. The largest contributors to this high energy consumption are heating, ventilation and air conditioning (HVAC) systems [6,7,8]. In residential buildings, cooling is becoming more popular. While the heating demand can be effectively reduced by better thermal insulation of a building, cooling plays a more significant role in the overall energy demand of buildings [9]. Increased comfort expectations in summer time are contributing to the rise in cooling demand. Mechanical cooling with electrically driven units is usually applied to achieve thermal comfort

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