Simulational analysis of adaptive outdoor reset control based on a fuzzy target temperature gap for a hydronic radiant floor heating system

Abstract

This paper proposes an adaptive outdoor reset control based on a fuzzy target temperature gap for a hydronic radiant floor heating system. A hydronic radiant floor heating system has nonlinear characteristics, such as the effect of time delay and temperature inertia. In hydronic radiant floor heating systems, a heating source system, such as a boiler, has a target temperature gap determined by nonlinear characteristics. An unadjusted target temperature gap causes the indoor temperature to fail at tracking the desired level, and results in many wide swings in room temperature. For these reasons, the hydronic radiant heating system has lower energy efficiency than is desired. To solve these problems, a fuzzy system is employed to find the dynamic target temperature gap of the hydronic radiant floor heating system under both indoor and outdoor temperatures. The fuzzy target gap temperature can determine calorie supply time and On-Off time. The obtained control system shows effectiveness compared with a classical On-Off controller. Simulational results are provided to illustrate the control performance.