The key point is that fast food such as KFC uses trans fatty acids when cooking these foods. Trans fatty acids produced by hydrogenation of unsaturated fatty acids account for 8%-70%.

For example, the design heat load of a heating system is 7MW, and the temperature difference between supply and return water of primary network is Δ t = 30℃. After calculation, the circulating water volume is 200 m/h. The diameter of the external network is DN200. Look-up table shows that the resistance coefficient along the way is 170Pa/m/m ... According to hydraulic calculation, the total resistance loss along the pipe network is 50m water column. If the water pump is selected according to this flow and lift, the power of the water pump is 45KW.

Standard thermal unit:

1 calorie =4. 19 joules.

Refers to the estimation of the average food supply per person in people's consumption during the reference period. The figures are expressed in calories, protein and fat. The unit of heat is calories. Until the recommended thermal unit "kilojoule" (1 calorie =4. 19 joule) is widely understood and accepted, the traditional thermal unit will be adopted.

Calories, also known as capital letter C, are most commonly used in food labels, which is equivalent to the heat required to raise 1 000 grams of water from 14.5 degrees Celsius to 15.5 degrees Celsius at1atmospheric pressure, which is about 4 186 joules.

Refer to the above content: Baidu Encyclopedia-Thermal Unit