How many special types of personnel are required for the construction industry?
You said all wrong, all wrong, all wrong! . the central fresh air system (not the new air unit) can only let the room in the closed doors and windows (or closed room) in the case of ventilation effect, can not be made Hot refrigeration; air conditioning have the effect of heating and cooling, can be carried out humidity control. . you said the heat recovery is a hot exchange of fresh air system, more energy-efficient products, divided into hot and humid exchange of new fans and hot new air units two. But the heat recovery efficiency is generally 65% to 80%, it does not have the effect of heating and cooling, in other words: when the air conditioning to adjust the indoor environment to a certain temperature, stop using, the use of hot exchange fresh air and ordinary fresh wind Than the former indoor temperature change is relatively slow!
Upstairs to understand the wrong, he said the dense area refers to the water pipe that pipe out of the mouth of the piece, where are generally very intensive, plus the purpose of the casing is to prevent the local temperature is too high
Perlite is a volcanic eruption of acid lava, the rapid cooling of the vitreous rocks, because of its pearl fracture structure named. Perlite deposits include perlite, obsidian and pine rock. The difference between the three is that the perlite has a circular arc-shaped crack formed by condensation, called perlite structure, water content of 2 to 6%; pine rock has a unique pine resin luster, water content of 6 to 10%; obsidian with glass Gloss and shell-like fracture, water content is generally less than 2%. You say the bubble, look at your description, is a chemical product, the main ingredient is benzene. Polystyrene foam board - also known as foam board, EPS board is made of volatile liquid blowing agent containing polystyrene beads, heated by the preheated in the mold after heating the formation of white objects, its fine The structure of the obturator is mainly used for building wall, roof insulation, composite board insulation, cold storage, air conditioning, vehicle, ship insulation, floor heating, decorative carving and other uses are very extensive. Perlite is generally flame retardant, foam board is a high price of flame retardant, one is not flame retardant cheap flame retardant meaning is not what we think, in fact, is not going to spread probably means that will be from Off, leave the open fire will automatically go out.
