Header assembly and use thereof

By incorporating internal inserts and a rotatable orifice plate design into the manifold assembly, the problem of uneven refrigerant distribution in microchannel heat exchangers is solved, achieving uniform distribution under different operating conditions and improving the performance and heat exchange efficiency of the heat pump system.

CN116007426BActive Publication Date: 2026-07-24XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202211729515.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-30
Publication Date
2026-07-24
Estimated Expiration
2042-12-30

AI Technical Summary

Technical Problem

When existing microchannel heat exchangers are placed vertically, the uneven distribution of the two-phase refrigerant is a serious problem, especially under different operating conditions, which makes it impossible to achieve uniform distribution and leads to the deterioration of system performance.

Method used

The system employs a manifold assembly, including a head, a first manifold, a rotatable orifice plate, and a second manifold. Through internal inserts and baffle design, it achieves uniform mixing and distribution of the gas-liquid two-phase refrigerant. The rotatable orifice plate, in conjunction with a gear driven by a motor, adjusts the flow area to adapt to different operating conditions.

Benefits of technology

It achieves uniform distribution of refrigerant under different operating conditions throughout the year, improves the performance of heat pump systems, reduces energy consumption, increases the annual energy efficiency ratio (APF), and enhances the heat exchange efficiency of water-cooled microchannel evaporators.

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Abstract

The application belongs to the field of refrigeration technology and equipment, and particularly relates to a header assembly and application thereof. The existing micro-channel heat exchanger is not uniformly distributed with refrigerant. The application provides a header assembly, which comprises a head, a first header, a rotatable orifice plate and a second header connected in sequence, and an inner insert is arranged in the first header. The inner insert comprises a hollow pipe, the hollow pipe is communicated with the rotatable orifice plate through a partition plate, a plurality of independent cavities are arranged outside the hollow pipe, the independent cavities are communicated with micro-channel flat tubes, the number of the independent cavities is the same as that of the micro-channel flat tubes, the plurality of independent cavities are arranged in the first header, and each independent cavity is communicated with the first header. Two-phase refrigerant enters the rotatable orifice plate from the second header, and gas-liquid gradually mixes and flows. The uniformly mixed refrigerant enters the independent cavities after colliding with the head in the hollow pipe, and then enters the micro-channel flat tubes. The influence of gravity and phase separation is eliminated, and uniform distribution can be realized under different working conditions throughout the year.
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