Basic knowledge of central air conditioning

Basic knowledge of central air conditioning 1. Basic knowledge of central air conditioning 1. What is refrigerant and what is its working principle? A working substance that transfers heat between the object to be cooled and the environmental medium, and finally transfers the heat from the object to be cooled to the environmental medium in the refrigeration cycle. Its working principle is that the refrigerant absorbs the heat of the substance to be cooled and evaporates in the evaporator. 2. What is a refrigerant and how does it work? The medium substance that transfers the cooling capacity of the refrigeration device to the cooling medium. For example, the commonly used air-conditioning chilled water is cooled in the evaporator and then transported at a long distance to cool the objects that need to be cooled. 3. What is sensible heat? That is, the heat that causes the temperature change without changing the form of the substance is called sensible heat. Sensible heat changes can be measured with temperature measuring instruments. 4. What is latent heat? The heat that causes the change of state (also called phase change) without changing the temperature of the substance is called latent heat. Latent heat changes cannot be measured with temperature measuring instruments. 5. What are dynamic pressure, static pressure and total pressure? When choosing an air conditioner or a fan, the three concepts of static pressure, dynamic pressure, and full pressure are often encountered. Static pressure (Pi): The pressure generated by the air molecules impinging on the wall due to irregular movement is called static pressure. When calculating, the static pressure with absolute vacuum as the zero point is called absolute static pressure. The static pressure with atmospheric pressure at zero is called relative static pressure. The static air pressure in the air conditioner refers to the relative static pressure. The static pressure is positive when it is higher than atmospheric pressure and negative when it is lower than atmospheric pressure. Dynamic pressure (Pb): refers to the pressure generated when the air flows. As long as the air flow in the duct has a certain dynamic pressure, its value is always positive. Total pressure (Pq): Total pressure is the algebraic sum of static pressure and dynamic pressure: Pq = Pi + Pb. The full pressure represents the total energy of 1m3 gas. If atmospheric pressure is used as the starting point for calculation, it can be positive or negative.

Recent related posts

Customers frequently viewed

Submitted Successfully
Submission Failed