Assessment of Air-Source Heat Pumps for Net-Zero Homes in Cold Climate

总部位于埃德蒙顿的Habitat Studio公司设计并建造了节能环保的净零住宅。现有的加热/冷却系统依赖于使用空气源热泵。这些泵在温暖和温和的气候下是有效的。然而，当外部温度显著下降（-20℃或更低）时，它们需要备用电加热元件，这是一个昂贵的解决方案。因此，**零净家居设计的整体效率降低。**在这个项目中，将探索修改现有加热系统的可能性，以避免使用昂贵的泵加热元件**。主要结果将是在室外低温-20℃及以下的良好控制的实验室条件下对这些泵的性能系数进行评级，对安装在埃德蒙顿几个家庭中的寒冷气候空气源热泵进行现场评估，并概述如何在室外低温下实现空气源热泵的高效率的想法。该项目的成果将为Habitat Studio对当前住宅设计的改进和未来住宅设计的改进做出重大贡献。如果水泵的性能系数在1.0以上，则可以减少太阳能光伏（PV）系统所需的屋顶**面积。**对寒冷气候空气源热泵的评估不仅为公司带来好处，也为**加拿大人带来好处。泵在寒冷气候条件下的性能数据是非常需要的，以提高效率**的净零家居设计。对于加拿大人来说，更高效的家居设计具有长期优势，因为它可以减少能源消耗和二氧化碳排放量。

An Edmonton-based company, Habitat Studio, designs and builds energy-efficient environmentally benign**Net-Zero homes. The existing heating/cooling system relies on use of air-source heat pumps. These pumps are**efficient at warm and mild climates. However, when the outside temperature decreases significantly (-20 C and**lower), they require backup electric heating elements which is an expensive solution of the problem. Therefore,**the overall efficiency of the net-zero home design reduces.**In this project, a possibility to modify the existing heating system in a way to avoid expensive heating elements**for the pump will be explored. The main outcomes will be rating of the coefficient of performance of these**pumps in well-controlled laboratory conditions at low outside temperatures of -20 C and below, in-situ**assessment of the cold climate air-source heat pumps installed in several homes in Edmonton, and outlining of**the ideas on how to achieve the high efficiency of air-source heat pumps at low outside temperatures. The**results of the project will contribute significantly to Habitat Studio for the modification of the present and**improvement of the future home designs. If the coefficient of performance of the pump is above 1.0, the roof**area required for the solar photovoltaic (PV) system can be reduced.**The assessment of the cold climate air-source heat pumps leads to benefits not only for the company, but for**the Canadians. Pumps' performance data at cold climate conditions is highly needed to improve the efficiency**of the Net-Zero home design. More efficient home design has long-term advantages for the Canadians since it**reduces energy consumption and CO2 footprint.