Study On Dynamic Thermal-Based Air-Conditioning Control Scheme

Control based on dynamic thermal comfort index had been studied as there is a developing tide to apply thermal comfort index for air-conditioning control. Up to now there is not appropriate dynamic thermal comfort index and model, PMV index is still used in the study. Here dynamic thermal comfort control means that PMV should not be always in comfort zone but regularly changed within a relatively big range while its equivalent PMV still conform with comfort demand. From some research we know that air-conditioning control based on dynamic thermal comfort index has good effect on both energy saving and health while steady thermal comfort is prone to decrease human body' s thermal adaptability.The results gained from the PMV computer program edited in this paper are compared with comercial soft and the precision is proved to be ok. Besides, uses BP artificial neural net work(ANN) to predicted PMV index intelligently and the output error reaches the application accuracy demand.Calculates and analyses the impact of the six factors of thermal comfort to the PMV index in the air-conditioning environment. TSV under dynamic thermal environment with a variety of combination of six influencing factors to thermal comfort is revised through computing and experiment data of human body' s TSV. Compared with steady thermal comfort control and conventional set-point temperature control it' s proved that equivalent PMV should not exceed 1. 0 in usual thermal environment with metabolism under 1. 2 met for dynamic air-conditioning scheme;moreover, indoor set temperature can be heightened greatly under standard conditions. On the basis of the above research the concept of using room air conditioner and a personal fan at the same time is discussed in the thesis and the control scheme of the temperature and air velocity in this mode is analyzed. The additional personal fan directly provides the constant temperature airflow of the simulating natural winds for people;it will assure the thermal comfort independently especially when control system turn off the compressor.In this paper, a set of control scheme of dynamic temperature and air velocity for room air conditioner with a additional personal fan through the elementary study of dynamic thermal comfort combined with the research and manufacture status of air-conditioning factory in our country. By computing and analyzing we get the energy savings effect of the scheme compared with static thermal comfort control.