A design method of a medium-temperature cold water centralized air conditioning system

By adopting a systematic design method for centralized air conditioning systems for medium-temperature chilled water, the problem of mismatch between equipment selection and operational requirements was solved, improving system efficiency and adaptability, and achieving the goals of efficient operation and energy saving and carbon reduction under medium-temperature water conditions.

CN121118377BActive Publication Date: 2026-05-26CHINA ARCHITECTURE DESIGN & RES GRP CO LTD
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Patent Information

Application Number
CN202511189449.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-08-25
Publication Date
2026-05-26
Estimated Expiration
2045-08-25

AI Technical Summary

Technical Problem

The existing design methods for medium-temperature chilled water centralized air conditioning systems lack scientific basis, resulting in a mismatch between equipment selection and actual operating needs, making it difficult to meet energy conservation and carbon reduction goals. In particular, there are gaps in the adaptive design for different climate zones and the setting of water supply temperature.

Method used

By extracting and judging initial data, calculating the indoor heat-to-moisture ratio and air supply status point, evaluating the dehumidification capacity of fresh air handling units and fan coil units, setting equipment selection parameters, and comprehensively considering the water supply temperature of fresh air handling units and fan coil units, determining the system water supply temperature, and ensuring the efficient operation of the system under medium-temperature water conditions.

Benefits of technology

It improves the system's coefficient of performance (COP), reduces the risk of mold growth in condensate, is easy to integrate with inverter technology and natural cold sources, enhances system efficiency during transitional seasons or low loads, and ensures efficient operation of the system under medium-temperature water conditions.

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Abstract

This invention relates to a design method for a medium-temperature chilled water centralized air conditioning system, belonging to the field of energy-saving air conditioning system design technology, and filling the gap in existing technologies for design methods of medium-temperature chilled water centralized air conditioning systems. The design method includes the following steps: S1, initial data extraction and initial judgment: determining whether adjustments to the selection and design of conventional fresh air handling units and fan coil units are needed; S2, calculating the indoor heat-to-moisture ratio and determining the air supply state point; S3, calculating the dehumidification capacity of the fresh air handling unit and fan coil units; S4, setting equipment selection parameters; S5, evaluating the dehumidification capacity of the fresh air handling unit; S6, evaluating the dehumidification capacity of the fan coil units; S7, determining the system supply water temperature. This invention can design medium-temperature chilled water centralized air conditioning systems with different operating conditions and determined supply water temperatures for different climate zones. Compared with normal temperature systems (7 / 12℃), the medium-temperature system has a higher evaporation temperature of the chiller unit, which can improve the system COP and achieve energy saving in air conditioning.
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