The following are the mandatory retirement years for various types of fire extinguishers: Portable foam fire extinguisher-5 years; Portable acid-base fire extinguisher — 5 years; Portable clean ...
When using a fire hydrant, first turn off the power of all fire extinguishing sites, open the glass door of the fire hydrant, press the manual alarm button, and the water pump connected to it will ...
In the event of a fire, take the fire extinguisher nearby. Take a hand-held fire extinguisher, pull out the safety plug with the other hand, shake it up and down several times, and stand 3-4 meters...
What does 1A stand for? It represents that 72 wood strips of 500mm length were used in the experiment, and 6 wood sticks in each layer were piled into 12 layers of wood stacks. Pre-burn with 1L ...
Under normal temperature and pressure, Refrigerant R417A is a non-azeotropic mixture of chlorine-free fluoroalkane refrigerant, a colorless gas. It is a compressed liquefied gas stored in a steel ...
Main use: R152a (Difluoroethane) is mainly used as refrigerant, foaming agent, aerosol and cleaning agent, and also an important component of mixed working fluid. 18kg/bottle, 640kg/bottle.
Main application: Refrigerant Gas R508B is mainly used to replace R13, R23, R503, with clean, low toxicity, non-flammable, and good cooling effect. It is widely used in ultra-low temperature refrig...
Types of household central air conditioners Commonly used household central air conditioners can be roughly divided into three types: air-cooled piping systems, air-cooled cold/hot water systems, a...
Indexes for evaluating the advancement of refrigeration compressor energy consumption: The coefficient of performance COP of a refrigeration compressor, namely : the cooling capacity per unit shaft...
Currently commonly used compressors mainly include piston compressors, scroll compressors, screw compressors and centrifugal compressors:
