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Large Temperature Difference Heat Exchange Absorption Unit
High-Efficiency Heat Exchange Solution Empowering Energy-Saving Upgrades in Thermal Systems
Product Overview
The Large Temperature Difference Heat Exchange Absorption Unit is a high-efficiency heat exchange device developed based on the lithium bromide (LiBr) absorption heat pump principle. It adopts large ΔT heat exchange technology to significantly increase the temperature difference between the supply and return water of the primary heating network, thereby enhancing the heat transfer capacity of existing pipelines. By fully utilizing the thermal potential of high-temperature water in the primary network, this unit delivers functions beyond those of conventional heat exchangers. It effectively reduces the return water temperature in the primary network, improves overall system efficiency, and offers an advanced energy-saving solution for district heating systems.
Advantages
- Enhanced Heat Transfer Capacity of Primary Network: Significantly increases heat transfer per unit time without altering pipelines or increasing the power consumption of circulating pumps.
- Reduced Energy Consumption and Investment: Lowers capital investment and operational power costs for new primary networks while reducing heat loss during transmission.
- Utilization of High-Temperature Water Potential Energy: Maximizes the thermal potential of primary network hot water to improve overall energy efficiency.
- Optimized Cogeneration Systems: Effectively lowers the return water temperature of the primary network, improving the operating conditions of the power plant’s condenser system, increasing output, and enhancing overall efficiency.
- Direct Replacement for Conventional Plate Heat Exchangers: Can replace traditional water-to-water plate heat exchangers in heating stations, enabling efficient energy exchange between primary and secondary networks.
Working Principle
The Large Temperature Difference Heat Exchange Absorption Unit uses high-temperature water from the primary network as its driving heat source. Water acts as the refrigerant and lithium bromide solution as the absorbent to complete the absorption cycle. In the evaporator, the refrigerant water evaporates under low pressure, absorbing heat from the primary return water and reducing its temperature. The resulting refrigerant vapor is absorbed by the concentrated lithium bromide solution in the absorber, which then releases heat to the secondary network water, raising its temperature.
The diluted solution is preheated by the solution heat exchanger before entering the generator, where it is reheated and reconcentrated by the high-temperature water from the primary network, producing refrigerant vapor again. The vapor then enters the condenser, where it releases heat and condenses into liquid, which returns to the evaporator to repeat the cycle.
The primary high-temperature network water passes sequentially through the generator, hot water heat exchanger, and evaporator for three-stage heat release. Meanwhile, secondary network water is introduced in parallel to both the absorber and hot water heat exchanger for heating.
Applications
- Upgrades of heat exchange stations in urban district heating systems
- Optimization of return water temperature in cogeneration systems
- Enhancement of secondary network heating efficiency in industrial parks
- New or expanded projects requiring a large supply/return water temperature difference
- Replacement of conventional water-to-water heat exchangers in energy-saving retrofit projects
