Study on the Intermittent Drying Process of Paddy Rice employing a Closed-Loop Transcritical CO<sub>2</sub> Heat Pump System

Huang Jinghan Wu Weidong Wang Huaichen

doi:10.12465/issn.0253-4339.20250906001

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Study on the Intermittent Drying Process of Paddy Rice employing a Closed-Loop Transcritical CO₂ Heat Pump System

更新时间：2026-03-06

- Study on the Intermittent Drying Process of Paddy Rice employing a Closed-Loop Transcritical CO₂ Heat Pump System
- Journal of Refrigeration Pages: 1-11(2026)
- 作者机构：
  
  上海理工大学能源与动力工程学院上海 200093
- 作者简介：
- 基金信息：
- DOI：10.12465/issn.0253-4339.20250906001
  CLC： TB61⁺1;S339.3⁺3
- CSTR：XXXXX.XX.XXX.20250906001
- Received：06 September 2025，
  
  Revised：2025-10-24，
  
  Accepted：20 November 2025，
  
  Online First：06 March 2026，
- 稿件说明：
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黄靖涵,武卫东,王怀琛.稻谷闭式跨临界CO₂热泵间歇干燥工艺研究[J].制冷学报,

Huang Jinghan Wu Weidong Wang Huaichen.Study on the Intermittent Drying Process of Paddy Rice employing a Closed-Loop Transcritical CO₂ Heat Pump System[J].Journal of Refrigeration,
黄靖涵,武卫东,王怀琛.稻谷闭式跨临界CO₂热泵间歇干燥工艺研究[J].制冷学报, DOI：10.12465/issn.0253-4339.20250906001. CSTR： XXXXX.XX.XXX.20250906001.

Huang Jinghan Wu Weidong Wang Huaichen.Study on the Intermittent Drying Process of Paddy Rice employing a Closed-Loop Transcritical CO₂ Heat Pump System[J].Journal of Refrigeration, DOI：10.12465/issn.0253-4339.20250906001. CSTR： XXXXX.XX.XXX.20250906001.

摘要

针对现有稻谷干燥中存在干燥品质较低和能耗较高的问题，本文基于闭式跨临界CO

热泵干燥系统，实验研究了缓苏比作为关键因素对稻谷热泵干燥品质指标和系统性能指标的影响规律。结果表明，装载量为25 kg，干燥室送风温度为55 ℃，物料表面风速为1.5 m/s的条件下，随着缓苏比从0增至4/6，稻谷表面水分蒸发速率加快，系统的平均干燥速率、平均SMER、单位能耗干燥量、单位时间单位体积干燥量均呈现上升趋势，爆腰率和脂肪酸值均呈现下降趋势，而平均COP

和COP

sys

整体趋势较为平稳。当缓苏比为4/6时，平均SMER为1.061 kg/（kW·h）、单位能耗干燥量为7.97 kg/（kW·h）、单位时间单位体积干燥量为67.60 kg/（m

·h）、平均COP

为4.72、平均COP

sys

为8.71，爆腰率为16%、脂肪酸值为11.67 mgKOH/100 g。综合考虑能耗、干燥效率与品质，最终选择4/6作为稻谷热泵干燥的最佳缓苏比。研究结果可为稻谷热泵干燥工艺的优化提供参考和指导。

Abstract

In view of the problems of low drying quality and high energy consumption in the existing paddy rice drying process， this study experimentally studied the influence law of the key factor of the "Tempering Ratio" on the quality indicators and system performance indicators of paddy rice heat pump drying based on the closed-loop transcritical CO

heat pump drying system. Experimental results indicated that under the conditions of a 25 kg loading capacity， drying chamber air temperature of 55 ℃， and material surface air velocity of 1.5 m/s， as the tempering ratio increased from 0 to 4/6， the paddy rice surface moisture evaporation rate accelerated. Correspondingly， the average drying rate， average specific moisture evaporation rate （SMER）， energy consumption per unit of drying capacity， and drying capacity per unit volume per unit

time for the system showed increasing trends， whereas both the cracking rate and fatty acid value for the system exhibited decreasing trends. The average coefficient of performance for the heat pump （COP

） and the average coefficient of performance for the system （COP

sys

） remained relatively stable. When the tempering ratio was 4/6， the average SMER reached 1.061 kg/（kW·h）， energy consumption per unit of drying capacity was 7.97 kg/（kW·h）， drying capacity per unit volume per unit time was 67.60 kg/（m³·h）， average COP

was 4.72， average COP

sys

was 8.71， cracking rate was 16%， and fatty acid value was 11.67 mgKOH/100g. Considering energy consumption， drying efficiency， and quality comprehensively， the tempering ratio of 4/6 was ultimately selected as the optimal ratio for rice heat pump drying. The research results can provide reference and guidance for the optimization of the heat pump drying process of paddy rice.

关键词

Keywords

references

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Study on the Intermittent Drying Process of Paddy Rice employing a Closed-Loop Transcritical CO2 Heat Pump System

DOI：10.12465/issn.0253-4339.20250906001

摘要

Abstract

关键词

Keywords

references

Study on the Intermittent Drying Process of Paddy Rice employing a Closed-Loop Transcritical CO₂ Heat Pump System