| 摘要: |
| 对现有吸收式换热器存在占地面积大、成本高、一次侧热水回水温度高等问题的原因进行了分析，指出问题根源在于吸收机内部存在大量“三角形”传热过程。介绍了全新的多级立式大温差发生-冷凝和蒸发-吸收基本单元，分析了其不仅能消除原吸收式换热器内不匹配的传热现象，而且做到结构紧凑的原理。由以上基本单元构建了新型吸收式换热器，称之为多级立式大温差吸收式变温器。建立了吸收式变温器的模拟分析模型，将其性能与传统单级吸收式换热器进行了比较。结果表明：吸收式变温器可制取的最低一次侧热水回水温度更低，从26℃降至20℃以下；总传热面积更小，当一次侧回水温度为26℃时，吸收式变温器的总KA（传热系数K与传热面积A的乘积）比单级吸收式换热器减小25%~32%，与此同时溶液泵总功率比单级吸收式换热器高出19%~48%，并没有显著增加。吸收式变温器相对于单级吸收式换热器具有明显性能优势。 |
| 关键词: 传热面积；大温差 吸收式热泵；换热器 |
| DOI： |
| 投稿时间：2012-11-11
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| 基金项目:高等学校博士学科点专项科研基金（20100002110028）资助项目 |
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| Performance Analysis on the Large Temperature Lift/Drop Multi-stage Vertical Absorption Temperature Transformer |
|
Wang Sheng, Xie Xiaoyun, Jiang Yi
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| (Department of Building Science, Tsinghua University) |
| Abstract: |
| The reasons for the problems of the existing absorption heat exchangers, such as excessively large size, high manufacture costs, and high return temperature of the primary network hot water, were attributed to the “triangular heat transfer processes” inside the absorption heat pumps. The structures of new Multi-stage Vertical Large Temperature Lift/Drop Generation-condensation And Evaporation-absorption Elementary Units were introduced, as well as their principles on how to eliminate the “triangular heat transfer processes” with a relatively compact structure. A new type of the absorption heat exchanger, called the Multi-stage Vertical Large Temperature Lift/Drop Absorption Temperature Transformer (ATT), was constituted by such elementary units. Simulation models for the ATT were built to compare its performance to the traditional single-stage absorption heat exchanger. Results showed that the ATT can reduce the minimum return temperature of the primary network hot water, from 26℃ to under 20℃. When return temperature of the primary network hot water is 26℃, the ATT can reduce the total KA (heat transfer areas multiplied by heat transfer coefficients) by 25%~32%, while the powers of solution pumps inside the ATT were only increased by 19%~48%, which were not remarkable. The ATT has obvious performance advantages over the traditional single-stage absorption heat exchanger. |
| Key words: heat transfer areas large temperature lift/drop absorption heat pump heat exchanger |
