HVAC COOLING LOAD CALCULATIONS AND PRINCIPLES. Sensible Heat Gain â is the energy added to the space by conduction, convection and/or radiation. Latent Heat Gain â is the energy added to the space when moisture is added to the space by means of vapor.
Rise of USB. Developed by a consortium of companies made up of Intel, Compaq, Microsoft, Sony, DEC, IBM, and Northern Telecom, the Universal Serial Bus (USB) was introduced in January 1996. At that time, the USB 1.0 standard was capable of delivering a transfer rate of 12 Mbit/s. In April of 2000, USB 2.0 was introduced with a transfer rate of 480 Mbit/s. More recently, the USB 3.0 standard reaches transfer rates of 4.8 Gbit/s.
1979: Seagate introduces the ST-506 drive and interface, which is then used in all early microcomputer implementations. 1980: IBM introduces the first gigabyte hard drive. It is the size of a refrigerator, weighs about 550 pounds, and costs $40,000. 1980: Seagate releases the first 5.25-inch hard disk.