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Experimental study on the gas engine speed control and heating performance of a gas Engine-driven heat pump

机译：燃气发动机驱动热泵燃气发动机转速控制和加热性能的实验研究

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The gas engine-driven heat pump (GEHP) system is an energy saving device for heating, cooling or hot water supply. As the power source of the system, the performance of gas engine speed control directly has a significant impact on the system stability and efficient operation. However, gas engine is typically a nonlinear dynamical system and easily disturbed by the load fluctuation, which increases the difficulty of control of gas engine speed. Therefore, a gas engine speed control strategy is proposed for a GEHP system. Aiming at achieving this objective, a test facility is developed and an engine speed controller is designed according to the characteristics of the gas engine and the GEHP system. Then the engine speed controller is applied to the GEHP system and experiments are performed under different conditions: engine speed setting control and anti-disturbance control. The experimental results show that it costs less than 40s to make the engine speed steady without overshoot when engine speed setting changes. When the disturbances of superheat change occur, the error (accuracy) of the engine speed is controlled within +/- 50 rpm. The engine speed control strategy can not only guarantee the stable operation but also satisfy the capacity adjustment performance of the GEHP system. Finally, performance characteristics of the GEHP are characterized by heating capacity and primary energy ratio (PER). The results indicate that engine speed is an important factor which influences the performance of the GEHP. The heating capacity increases with the increase of engine rotational speed, while PER of the GEHP decreases. In terms of energy saving, the GEHP system should operate at lower engine speed in the case of satisfying the system load. (C) 2018 Elsevier B.V. All rights reserved.
机译：燃气发动机驱动的热泵（GEHP）系统是一种用于供热，制冷或热水供应的节能设备。作为系统的动力源，燃气发动机速度控制的性能直接影响系统的稳定性和高效运行。然而，燃气发动机通常是非线性动力学系统，并且容易受到负载波动的干扰，这增加了燃气发动机转速的控制难度。因此，提出了针对GEHP系统的燃气发动机转速控制策略。为了达到该目的，根据燃气发动机和GEHP系统的特性，开发了测试设备并设计了发动机速度控制器。然后将发动机转速控制器应用于GEHP系统，并在不同的条件下进行实验：发动机转速设定控制和抗干扰控制。实验结果表明，当发动机转速设置发生变化时，使发动机转速稳定且不会出现超调的时间不到40秒。当发生过热变化的干扰时，发动​​机转速的误差（精度）控制在+/- 50 rpm之内。发动机转速控制策略不仅可以保证运行稳定，而且可以满足GEHP系统的容量调节性能。最后，GEHP的性能特征以热容量和一次能源比率（PER）为特征。结果表明，发动机转速是影响GEHP性能的重要因素。加热能力随着发动机转速的增加而增加，而GEHP的PER则降低。在节能方面，GEHP系统应在满足系统负载的情况下以较低的发动机转速运行。 （C）2018 Elsevier B.V.保留所有权利。

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