H.Stars (Guangzhou) Refrigerating Equipment Group Ltd.

  ​It comes to charging refrigerant in   HVAC systems , there are various techniques that be utilized for accurate results. Each method has its advantages and is suitable for different scenarios. In this article, we will explore six charging techniques and their applications. 1. Weighing Method: The weighing method is the most accurate approach, involving the direct addition of the required amount of refrigerant into the system. This technique is particularly suitable when the charging requirements are known, and a full charge is needed. It is commonly used for self-contained units. In the case of smaller charging amounts during system repairs, it is customary to release the refrigerant, perform the necessary repairs, and then add the required quantity. 2.   Current Method: Using the rated current, the current method requires the installation of a clamp ammeter at the input of the air conditioning power supply. To charge the system, connect the refrigerant cylinder to the low-pressure

  The calculation of air supply in a cleanroom differs from that of a general HVAC system. HVAC systems determine air supply based on calculated thermal and humidity loads, considering an economical air supply temperature difference to eliminate excess heat and moisture. In contrast, cleanroom air supply is generally calculated independent of thermal and humidity loads. Instead, it is based on the required cleanliness level, considering cross-sectional average airspeed or air changes per hour. If necessary, thermal and humidity load calculations are used for verification, ensuring compliance with heat and moisture elimination requirements. Cleanroom air supply, typically calculated based on cross-sectional average airspeed or air changes, tends to be higher than the air supply calculated for heat and moisture elimination. If the calculated air supply falls short of the requirements for heat and moisture elimination, two solutions are considered: using the air supply calculated for heat