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Adaptive control of radiator systems for a lowest possible district heating return temperature

机译：散热器系统的自适应控制，以实现最低的区域供热返回温度

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摘要

The present paper describes how the control of a radiator system connected to a district heating (DH) network via a heat exchanger can be optimized to provide the lowest possible DH return temperature. This can be achieved for each operating point by employing an optimal combination of radiator circuit supply temperature and circulation flow rate. The control algorithm gradually modifies the control curve for the radiator circuit, enabling it consistently to provide an optimal cooling of the DH water. Since the heat exchanger is dimensioned for very low outdoor temperatures, it is oversized for smaller heat loads. In addition, radiator systems are often oversized due to safety margins. Such facts render it possible to reduce the DH return temperature. The objective of the present study was to develop a control algorithm and to test it in practice. A description is here given of the algorithm, and, additionally, of field tests that were undertaken to practically verify it. The adaptive control method could be implemented in any modern radiator circuit control logics, and the achieved improvement was an added 2℃ district heating water cooling, resulting in a 3.5 per cent reduction in average district heating flow.
机译：本文介绍了如何优化通过热交换器连接到区域供热（DH）网络的散热器系统的控制，以提供尽可能低的DH返回温度。通过采用散热器回路电源温度和循环流量的最佳组合，可以针对每个工作点实现这一点。控制算法逐渐修改散热器回路的控制曲线，使其始终如一地提供DH水的最佳冷却效果。由于热交换器的尺寸适合于非常低的室外温度，因此它的尺寸过大，以减小热负荷。另外，由于安全裕度，散热器系统通常尺寸过大。这些事实使得可以降低DH返回温度。本研究的目的是开发一种控制算法并在实践中进行测试。这里给出了该算法的描述，此外还给出了为实际验证而进行的现场测试。自适应控制方法可以在任何现代散热器电路控制逻辑中实现，并且所实现的改进是增加了2℃的区域供暖水冷却，从而使区域平均供热流量减少了3.5％。

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