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Refrigeration units can recover condensation heat, which is an important way to improve energy efficiency and reduce operating costs in many industrial and commercial applications. During the operation of the refrigeration unit, the refrigerant is heated and pressurized by the compressor before flowing into the condenser. The condenser cools the high-temperature and high-pressure refrigerant and releases heat, which is called condensation heat. Usually, condensation heat is carried away and dissipated into the environment through cooling water or air, but if utilized, it can be converted into valuable thermal energy resources.
The common form of condensation heat recovery is through heat recovery devices or heat exchangers, which introduce this heat energy into the hot water system for heating domestic hot water, heating, washing water preheating, and even for other industrial processes that require heat energy. For example, in food processing plants, dairy factories, slaughterhouses, and other places, the condensation heat generated by the refrigeration system can be used to preheat cleaning water or process hot water, thereby reducing the load on boilers and fuel consumption. In places such as hotels, supermarkets, and cold chain logistics centers, bathing or domestic hot water can also be supplied through heat recovery systems to achieve cold and hot water supply and reduce energy consumption.
Recycling condensation heat not only helps improve the overall energy utilization efficiency of the system, but also significantly reduces operating costs and carbon emissions. Under reasonable design, a refrigeration unit can not only provide cooling, but also effectively utilize condensation heat for building heating systems, thus forming a cold and hot combined supply system (CHC, Cooling, Heating, and Cogeneration), achieving the energy-saving goal of multi-purpose use of one unit.
To achieve efficient recovery of condensation heat, it is usually necessary to add heat recovery devices in the refrigeration system, such as plate heat exchangers, sleeve heat exchangers, or dedicated heat recovery modules. These devices act as intermediaries between the condenser and the heat dissipation pipeline, transferring heat energy from the refrigerant to water or other media. The entire process requires precise temperature and pressure control to ensure the stability and safety of heat recovery. In addition, in order to ensure the overall energy efficiency of the system, the recovery system should also be flexibly adjusted according to load changes to avoid excess heat energy or a decrease in recovery efficiency.
It should be noted that the recovery effect of condensation heat is closely related to the operating conditions of the system, such as whether the refrigeration load is continuously stable, whether the condensation temperature is high enough, and whether the hot water demand is matched. If the output of heat is unbalanced with the demand, it may be necessary to set up a thermal storage system or auxiliary heat source for supplementary regulation.
