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Show Air Moving at Slow Speed Maket tor Most Comfort Large volumes yf nlr moving nt low velocities are more efficient in producing produc-ing a cooling comfort e(lect than relatively rel-atively small quantities moving at high velocity, the Holland Institute of Tliermology of Holland, Mich., states. Twelve years of research In American laboratories of ventilation have shown that the cooling effect of moving air cannot be doubled simply by doubling the speed of Its motion. . This principle Is taken advantage of In the nodern "vnporalre" heating system sys-tem which produces a cooling effect In the home during summer by keeping keep-ing the air circulating through it at moderate velocity. This system work- Ing in hot weather moves three or four times as much air through the rooms as the ordinary warm air circulating cir-culating system does In winter. In winter, too, the system operates on the principle of a large volume of moderately warmed air Instead of a small quantity of superheated air. And this makes for health because moderately warmed air produces mil. form temperatures In the rooms and has a beneficial effect on the breathing breath-ing apparatus of the human body, while excessively hot ulr parches the membranes of the nose and throat and makes them liable to colds and other diseases. |