Study On Thermal Environment And Improvement Measures Of The Military Tents

With the troops play in social responsibility than the role more and more,for example, emergency rescue and disaster relief, military exercises, field in training and dealing with emergencies and other, this time can be for them to provide convenient and comfortable living environment for the rest of the troops becomes particularly important. A comfortable living environment to ensure good combat troops, however, indoor tent in hot summer and cold winter comfort problems are the main problems to be solved, so research on military tents indoor thermal environment and improvement measures become very important.Based on the understanding of indoor thermal environment and improvement measures of conventional buildings and tents, combined body heat balance equation for heat exchanger tent way were analyzed, and then the four environmental factors:temperature, humidity, wind speed, radiant temperature and two individual factors metabolism and the thermal resistance of clothing were analyzed.Author through the preliminary investigation found that tent envelope thin, thermal resistance thermal inertia of small, leading to resist ability of the outdoor environment changes is very small, bad thermal insulation, which makes tents in the summer hot and winter cold, indoor living environment is very bad. The author through to the tent transition seasons, winter and summer testing found that the transition season closed tent individual time indoor temperature higher than the average skin temperature 33.66 ℃, the summer closed indoor temperature is very hot, the highest close to 45 ℃, far beyond the scope of the human body can withstand,winter indoor temperature and outdoor environment temperature are close.This paper makes a comparison test of the simple and feasible improvement measures,transition season tent open door window ventilated, tent indoor temperature reduce about 1~ 2 ℃. The summer closed tent indoor temperature is much higher than outdoor air temperature, through the open doors and Windows to strengthen the inside and outside of displacement ventilation, indoor temperature can reduce highest about 5 ℃,top summer shade measures taken so that the top wall surface temperature than the closed state is reduced by about 14 ℃, the indoor air temperature lower than the closure of about 6~ 7℃,and then improved to some extent the tent indoor thermal environment and improve indoor comfort.Using Fluent software to simulate the temperature field of the transition season and summer, the results show that the indoor temperature of the tent is improved, and the simulation results are in accordance with the experimental results, which verifies the effectiveness of the improvement measures. Even take simple improvement measures, the summer tents indoor temperature is higher than that of outdoor air temperature,therefore, it is also increasing the window area of the tent and forced mechanical ventilation of different wind speeds to simulate that found the window area increases and the indoor temperature is reduceed, when the wind speed is increased 1.2m/s, the jet range is increased, interior displacement ventilation effect is obvious, the indoor air temperature is close to the outdoor air temperature, the greater degree improves the indoor thermal environment, thus laid a foundation for later improvement measures to further study. In the end, the paper introduces the technology of evaporative cooling, and discusses the adaptability and comfort of the air conditioning fan in the tent.