| Indoor environment is one of the most important living and working surroundings for modern human being, so that its quality is the main factor affecting the human health, indoor work efficiency and the energy consume in construction environment. Electric air conditioners are widely used in modern indoor environment because that they can change the thermal environment efficiently. But the man-made indoor neutral-thermal environments so far have significant differences with natural environments, so it results in a series of problems such as indoor environment pollution, the large energy consume and the decay of human resistibility and adjust function on body temperature.This thesis studied on the characteristics of mechanical winds and natural winds, simulation technology of the natural winds and the estimation for thermal comfort abstractly and experimentally, synthetically applying signal processing technology, simulation technology, virtual instrument technology, thermal comfort theory and the theory of ergonomics. The purpose of this study is to realize real natural wind simulation, to improve the terminal winding mode of the air conditioners and the human comfort, to reduce energy consume.Following main results are obtained:1. This thesis defined a new concept of comfortable natural wind, indicated out the research objects of the winding modes of the natural winds and the natural winds simulation on indoor conditioners.2. The two dimensional dynamic characteristics of airflows are systemically analyzed for the first time of the machine and common simulation winds and the natural winds under different outdoor environments, with the near earth natural winds as cores. It is found that there are obvious differences amog the two dimensional dynamic characteristics of the machine and common simulation winds and the natural winds; The partial distribition of the probability density of the wind speed is not the character of thenatural winds, the most speeds of seashore and grassland wind samples in leading direction are normal distributions.3. A two dimensional simulating system of the indoor natural winds is established for the first time with the virtual technology of LabVIEW. The lifelike simulation for the near earth natural winds is achieved based on unabridged reservation of the intrinsic characteristic information of the natural winds.4. The human body test under the constant temperature airflow indicated that the winding feeling from the simulation natural winds is improved widely compared to the machine and common simulation winds. The simulating natural winds have better comfort and acceptability than the other two, and about 90% of the subjects are fond of the simulating natural winding flow. The subjective estimates of TSV and TCV proved that the winding compensation of the simulating natural airflow make people achieve the thermal comfort more easily under the temperature conditions of 27C and 29C. As a result, the thermal comfort grade of the simulating natural winds is obviously higher than that of the machine and common simulating ones.5. The physiological mechanism of different constant temperature airflow on human thermal comfort is investigated for the first time. The test indicated that there are significant effects of constant temperature airflow on EEG and heart rate variability. It is found that the estimating indexes of heart rate variability of MRR, RMSSD and HRVI etc have different sexual sensitivity. The constant temperature airflow of the simulating natural winds can increase the active level of human's pneumogastric nerves, making human body be flabby, relaxed and comfortable. The result indicates the physiological mechanism of the effect of different winding characteristics on the human thermal comfort.
|
PDF Full Text Request