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Performance mapping for variable-speed ductless heat pump systems in heating and defrost operation

机译：变速无管热泵系统在制热和除霜操作中的性能映射

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The market for variable-speed ductless heat pump (DHP) systems has grown in North America in recent years. However, the tools available for modeling their performance within building simulation programs have not kept pace. In general, simple empirical models are typically used for characterizing equipment performance for use in system simulation. However, unlike more conventional single-speed systems, DHPs have complicated control algorithms for managing electronic expansion valve opening, compressor speed, fan speed, and defrost operation. Very little work has been done in the development of empirical models that explain the impact of these characteristics on the performance of DHP systems. In this article, an empirical approach is introduced to model the heating and defrost performance of DHP systems under a wide range of conditions. The model incorporates separate relationships for performance associated with maximum, minimum, and intermediate (part-load) heating capacities. The defrost operation of the systems is also modeled empirically. The approach was tested on data from two DHP systems and the agreement is very good. The performance of the systems under different building loads was simulated and it is shown that the performance is highly dependent on the system control characteristics.
机译：近年来，变速无管热泵（DHP）系统市场在北美增长。但是，可用于在建筑仿真程序中对其性能进行建模的工具并未跟上进展。通常，简单的经验模型通常用于表征设备性能以用于系统仿真。但是，与更传统的单速系统不同，DHP具有复杂的控制算法，用于管理电子膨胀阀的开度，压缩机速度，风扇速度和除霜操作。在解释这些特征对DHP系统性能影响的经验模型的开发中，所做的工作很少。本文介绍了一种经验方法来模拟DHP系统在各种条件下的加热和除霜性能。该模型结合了与最大，最小和中间（部分负荷）加热能力相关的性能的单独关系。系统的除霜操作也根据经验进行建模。该方法已在两个DHP系统的数据上进行了测试，协议很好。模拟了在不同建筑物荷载下系统的性能，结果表明性能在很大程度上取决于系统的控制特性。

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