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Analysis and design of a solid adsorbent heat driven heat pump.

机译：固体吸附剂热驱动热泵的分析和设计。

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摘要

In the common vapor compression refrigeration cycle, the compressor transports refrigerant vapor from the low pressure evaporator to the high pressure condenser. This function can also be accomplished through the alternate heating and cooling of solid adsorbent beds exposed to the refrigerant and connected via check valves to the evaporator and condenser. To heat and cool the solid adsorbent, a heat transfer fluid is pumped through a circuit consisting of the two beds, a fluid cooler, and a fluid heater. This heat transfer fluid passes through tubes which are embedded in the solid adsorbent. The system performance can be improved if thermal energy stored in the "hot" bed is recovered and used in heating the "cold" bed. This regeneration of heat can be accomplished if a steep axial temperature profile exists in the fluid passing through the bed.; To analyze the performance of this system, a one dimensional model of the transient heating and cooling of the solid adsorbent beds was used. The resulting system of two second order nonlinear partial differential equations were solved numerically to obtain the transient bed and fluid axial temperature profiles. The solution obtained in this work includes conduction, convection, mass transfer, and thermal capacity in both the fluid and solid.; Knowledge of the transient temperature profiles in the solid adsorbent bed permits calculation of the refrigerant adsorption in the bed. From these adsorption profiles, the refrigerant flow to the condenser and from the evaporator can be determined. The fluid cooler heat output and heater heat input can also be calculated from the transient heat transfer fluid temperatures exiting the beds. With this information the system coefficient of performance (COP) is calculated.; It was determined that there are bed designs that result in steep axial temperature gradients in the heat transfer fluid. These "thermal waves" permit energy stored in the "hot" bed to be recovered and used in heating the "cold" bed. The solid adsorbent heat pump thermodynamic system model developed in this work shows that the potential for high COP's exists. In addition, the model shows that the operating characteristics of the solid adsorbent heat pump are favorable.
机译：在普通蒸汽压缩制冷循环中，压缩机将制冷剂蒸汽从低压蒸发器传输到高压冷凝器。该功能也可以通过交替加热和冷却暴露于制冷剂并通过止回阀连接到蒸发器和冷凝器的固体吸附剂床来实现。为了加热和冷却固体吸附剂，将传热流体泵送通过由两张床，一个流体冷却器和一个流体加热器组成的回路。该传热流体通过嵌入在固体吸附剂中的管。如果回收存储在“热”床中的热能并将其用于加热“冷”床，则可以提高系统性能。如果通过床的流体中存在陡峭的轴向温度分布，则可以实现热量的再生。为了分析该系统的性能，使用了固体吸附剂床的瞬态加热和冷却的一维模型。对所得的两个二阶非线性偏微分方程组进行数值求解，以获得瞬态床和流体轴向温度曲线。在这项工作中获得的解决方案包括流体和固体中的传导，对流，传质和热容。了解固体吸附剂床中的瞬态温度曲线可以计算制冷剂在床中的吸附量。根据这些吸附曲线，可以确定制冷剂流向冷凝器并从蒸发器流。流体冷却器的热量输出和加热器的热量输入也可以根据离开床层的瞬态传热流体温度来计算。利用该信息，可以计算系统性能系数（COP）。已经确定存在床设计，该床设计导致传热流体中的陡峭的轴向温度梯度。这些“热波”允许存储在“热”床中的能量被回收并用于加热“冷”床。在这项工作中开发的固体吸附剂热泵热力学系统模型表明存在高COP的潜力。此外，该模型表明固体吸附剂热泵的运行特性良好。

著录项

  • 作者

    Miles, Daniel Joseph.;

  • 作者单位

    Georgia Institute of Technology.;

  • 授予单位 Georgia Institute of Technology.;
  • 学科 Engineering Heat and Thermodynamics.
  • 学位 Ph.D.
  • 年度 1989
  • 页码 133 p.
  • 总页数 133
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 能源与动力工程;
  • 关键词

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