Thông gió và người hâm mộ Box loại người hâm mộ và tốc độ thấp, người hâm mộ paddle loại lớn - thường được gọi là cao Khối lượng thấp Speed (HVLS) người hâm mộ - là hai loại nguyên tắc được sử dụng cho nhà ở động vật. Người hâm mộ hộp được sử dụng trong kho tie gian hàng thông thường hoặc nhà lỏng lẻo như kho gian hàng miễn phí. | Equipment Operation and Maintenance Ventilation and Fans Box-type fans and large low-speed paddle type fans - often called High Volume Low Speed HVLS fans - are the two principle types used for animal housing. Box fans are used in conventional tie stall barns or loose housing such as free stall barns. The HVLS fans are recommended only for loose housing applications with high side wall heights. If fans are being used choose the most efficient ones available and make sure they re equipped with totally enclosed motors see section on Electric Motors . Generally as fan diameters increase the efficiency also goes up. For example a standard 48 box fan would have an average efficiency of 17 cfm watt while Poor maintenance can reduce a fan s efficiency by 50 or more. - New York Cooperative Extension Service a high efficiency 48 box fan would move 20 cfm watt or more - a 20 increase in efficiency. Generally in dairy free-stall housing the fans will be operating at 0 inches of static pressure according to Kansas State University. In tie-stall or tunnel ventilated buildings fans will be operating against 1 10 to 1 4 inches of static pressure. To compare fans from different manufacturers the Bioenvironmental and Structural Systems Lab BESS at the University of Illinois at Urbana-Champaign conducts standardized tests on fans with accessories and publishes the test results Appendix . Selecting fans for energy efficiency - simply expressed as airflow rate per unit of input energy or cfm per watt - is becoming very important. A higher cfm per watt rating will indicate a more efficient fan. So please remember that both fan performance and energy efficiency can vary widely. A 48 fan can have an efficiency as low as 13 cfm watt or as high as 23 cfm watt at static water pressure for the same application. This is why it s recommended to review testing information from the BESS. When comparing fans of different sizes or from different manufacturers it s very useful to study their .
