Air temperatures were continuously recorded inside four incubators with proportional heating control and six incubators with on/off heating cycles, during routine use. The air temperatures in the former were constant throughout, with a gradient between the roof and above-mattress air temperature not exceeding 1 degree C. In contrast, the recordings from the latter models showed a regular cyclic...

This paper examines methods for limiting occupational silica exposures for roof bolting personnel in underground coal mining. A canopy air curtain and an air tube were evaluated as means to provide filtered air over the breathing zone of these personnel. Laboratory testing showed that dust reductions beneath the air curtain and air tube approached 60 percent and 40 percent, respectively, with l...

A 2D unsteady computational fluid dynamics (CFD) model is employed to simulate buoyancy-driven turbulent ventilation in attics with different pitch values and ceiling insulation levels under summer conditions. The impacts of roof pitch and ceiling insulation on the cooling load of gable-roof residential buildings are investigated based on the simulation of turbulent air flow and natural convect...

Global warming has become a threat of our time. It poses challenges to the existence of all biota on this earth and has made a clear impact on the level of energy and water consumption. No doubt, increase in the ambient temperature increases indoor and outdoor temperature level of the buildings which catalyzes the use of energy and cost intensive mechanical air-conditioning systems. Green roof ...

In our daily life, central heating systems are generally used in home and office heating. The majority of fuel used in these systems are either natural gas or coal. However, in some cases air-conditioners and electrical oil-radiators are preferred in the heating of small mediums. But, the cost of electrical based heating is much higher than the cost of natural gas or coal based heating. Conside...

this thesis looked at the effect of clay and silt soil blocking the heat transfer area of the radiator and its effect on the engine coolant through the conduct of experiments and a mathematical model developed. the results indicated that the percentage area covered resulted in a proportional increase of the inlet and outlet temperatures of the coolant in the radiator. the mathematically model d...

Most traditional elementary school classrooms here do not have air-conditioners and it often feel stuffy in classrooms located in the top floors. In addition, traditional classrooms widely have noise problem, so do the open educational classrooms. If the windows and doors are closed to reduce noise, it will result in the phenomenon of stuffiness, which largely prevents the external air entering...

8 High concentrations of airborne particulate matter in factories can cause serious health problems 9 for workers. One significant reason for these high concentrations is the poor performance of the 10 ventilation systems in workplaces. This investigation developed a strategy that combines 11 computational fluid dynamics (CFD) simulations and on-site measurements to study and improve 12 the ven...

We report a relatively rare case of an essentially isolated orbital roof "blow-in" fracture in a pediatric patient. A 13-year-old male presented with headache and nausea following blunt facial trauma sustained during a skate boarding accident. CT head revealed soft tissue swelling and an abnormal bony density in the superior, posterior right orbital region. Follow-up CT orbits revealed a commin...

This paper studies the heating load and thermal comfort distribution in a typical office with a mixed radiant and convective heating system for two different locations of radiant heat sources. Accurately estimating the heating load in a mixed heating space requires careful consideration of the energy balance on each room surface and the comfort level in the space. A pure radiant heating system ...