H.Stars (Guangzhou) Refrigerating Equipment Group Ltd.

 Water Chillers are generally divided into the following categories: screw chillers, centrifugal chillers, water ring heat pump units, plate and tube evaporative condensing screw chillers, thermal storage air conditioners, etc. Screw chiller and centrifugal chiller are equipment that we often encounter. Below,  Oumal Refrigeration  will take you to understand the difference between centrifugal chiller and screw chiller? What is a  screw chiller ? The compressor adopts a screw type, hence the name screw chiller. The refrigerant coming out of the evaporator of the unit is a gas; after adiabatic compression by the compressor, it becomes a high-temperature and high-pressure state. The compressed gas refrigerant is isobarically cooled and condensed in the condenser. After condensation, it changes into liquid refrigerant, and then expands to low pressure through the throttle valve and becomes a gas-liquid mixture. The liquid refrigerant under low temperature and low pressu...

  Central air conditioning can be classified into three main types: electric refrigeration air conditioning, lithium bromide refrigeration air conditioning, and other energy source air conditioning. Among them, electric refrigeration air conditioning is the most commonly used form of air conditioning. Let's discuss the classification of electric refrigeration air conditioning in detail. I. Classification by Cooling Method Air-cooled: The condenser uses forced air convection for heat exchange. This type is commonly used in residential air conditioners. Air-cooled air conditioners can be categorized into single cooling type and heat pump type. The single cooling type is only used for cooling in summer, while the heat pump type can provide both cooling in summer and heating in winter. Water-cooled: Heat dissipated by the condenser is cooled using water flow. In order to save water, the cooling water discharged from the condenser is pumped to the cooling water tower, where it undergoes...

  Extended use of condensers in   HVAC systems   often leads to the formation of scale deposits in the pipes. If not addressed promptly, these deposits can compromise heat exchange efficiency, resulting in elevated condensation temperatures, reduced cooling capacity, and increased power consumption. Regular scale removal is crucial for maintaining optimal system performance. Methods for Scale Removal and Prevention: Mechanical Descaling Method: Procedure: Evacuate refrigerant from the condenser. Close all valves connected to the refrigeration system. Supply cooling water to the condenser. Use a flexible shaft cleaner with a rotating scraper to gently remove scale deposits. Employ circulating cooling water to cool the scraper and flush removed debris into a collection tank. Considerations: Choose an appropriate scraper diameter for effective yet non-damaging descaling. Conduct the process in multiple passes for thorough scale removal. Chemical Cleaning Method: Procedure: P...

  In the design and operation of data center air conditioning systems, accurately calculating the cooling capacity is a key factor in ensuring efficient and stable operation. This article delves into the methods of calculating cooling capacity and its application in different types of  data centers. 1. Methods for Calculating Cooling Capacity Calculating cooling capacity is the foundation for assessing the air conditioning needs of a data center. The main methods include the power and area methods, taking into account the heat generated by equipment and the environmental heat load. ​ Formula: Total Cooling Capacity (Qt) = Indoor Equipment Load (Q1) + Environmental Heat Load (Q2) Q1 = Equipment Power × 1.0 Q2 = 0.12~0.18 kW/m² × Data Center Area 2. Precision Air Conditioning and Cold Load Estimation For precision air-conditioned spaces such as data centers, cold load estimation needs to consider factors such as equipment heat load, environmental heat load, lighting, and personn...

  A   screw chiller , also known as a screw compressor chiller, is a type of water chiller utilized for cooling applications in various industries, including injection molding. The semi-hermetic screw compressor is the core components of a screw chiller.  It operates based on the principle of a rotary screw compressor, which is a positive displacement compressor. The screw compressor consists of two interlocking helical rotors that compress the refrigerant gas to raise its pressure and temperature. According to different heat dissipation methods, screw chillers are divided into  air-cooled screw chillers  and water-cooled screw chillers. Under the same cooling capacity requirement, the purchase cost of water-cooled screw chillers is lower than that of air-cooled screw chillers. As far as chiller installation is concerned, air-cooled screw chillers are easier to install. Here are some key features of a screw chiller: Cooling capacity: Screw chillers are available...

  As an integral part of the hospitality industry, hotels have high requirements for temperature control and fresh air. Various   refrigeration equipment   is necessary to meet the needs of comfort and food preservation. In this article, we will explore various typical refrigeration scenarios in hotels, along with specific refrigeration equipment used in different settings and their design selection principles. 1.Different Refrigeration Applications and Corresponding Equipment in Hotels As an integral part of the high-standard hospitality industry, hotels utilize various refrigeration equipment to provide guests with a comfortable and high-quality service environment, including dining experiences. Typical refrigeration applications in hotels include: 1.1 Central Air Conditioning System Designing a constant temperature and humidity central air conditioning system to control the temperature in public areas and accommodation spaces such as hotel lobbies, guest rooms, and mee...

  Industrial heat pumps   have revolutionized the HVAC industry by providing energy-efficient heating and cooling solutions. This article aims to shed light on the efficiency, advantages, and diverse applications of industrial heat pumps, showcasing their significance in the field of thermal management. How Efficient Are Industrial Heat Pumps? 1.1 Understanding COP (Coefficient of Performance): - Explaining the concept of COP and its significance in measuring the efficiency of industrial heat pumps. 1.2 Energy Savings: - Highlighting the substantial energy savings achieved by industrial heat pumps compared to traditional heating and cooling systems. 1.3 Environmental Benefits: - Discussing the reduced carbon footprint and environmental impact resulting from the high efficiency of industrial heat pumps. Advantages of Industrial Heat Pumps: 2.1 Versatility: - Showcasing the versatility of industrial heat pumps in providing both heating and cooling capabilities. 2.2 Cost Savings:...