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It was originally defined as the rate of heat transfer that results in the freezing or melting of 1 short ton (2,000 lb; 907 kg) of pure ice at 0 °C (32 °F) in 24 hours. [1] [2] The modern definition is exactly 12,000 Btu IT /h (3.516853 kW). Air-conditioning and refrigeration equipment capacity in the U.S. is often specified in "tons" (of ...
A Singapore Tourist Pass may be purchased from S$22 [64] (inclusive of a S$10 refundable card deposit and a 3-day pass) for the payment of public transportation fares. The card may be purchased at selected TransitLink Ticket Offices, LTA Kiosks, Passenger Service Centres and Singapore Visitors Centres, and can be refunded at both TransitLink ...
The hourly ventilation rate divided by the volume of a space. For perfectly mixed air or laminar flow spaces, this is equal to the number of times per hour that the volume the space is exchanged by mechanical and natural ventilation. Also called air change rate or air exchange rate. Abbreviated ACH or ac/hr. air conditioner
Clean air delivery rate (CADR) is the amount of clean air an air cleaner provides to a room or space. When determining CADR, the amount of airflow in a space is taken into account. For example, an air cleaner with a flow rate of 30 cubic metres (1,000 cu ft) per minute and an efficiency of 50% has a CADR of 15 cubic metres (500 cu ft) per minute.
Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed and replaced in an hour. If the air in the space is either uniform or perfectly mixed, air changes per hour is a measure of how many times the air within a defined space is replaced each hour.
A retrofitting programme was completed in 2006, with every station provided with at least one barrier-free access route. [72] Over the years, additional barrier-free facilities have been constructed in stations. [73] [74] [75] Since 2020, newer MRT stations have been fitted with a minimum of two lifts. [76]
It is the rate of heat transfer needed to freeze 1 short ton (907 kg) of water into ice in 24 hours. In the United States and Canada, the R-value that describes the performance of thermal insulation is typically quoted in square foot degree Fahrenheit hours per British thermal unit (ft 2 ⋅°F⋅h/Btu). For one square foot of the insulation ...
Singapore was the first city in the world to implement an electronic road toll collection system for purposes of congestion pricing. [6] Its use has inspired other cities around the world in adopting a similar system, particularly London 's Congestion Charge Zone (CCZ) , Stockholm 's congestion tax , [ 7 ] and New York City 's Central Business ...