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

一家总部位于埃德蒙顿的公司，人居工作室，设计和建造节能环保的**净零度房屋。现有的供暖/制冷系统依赖于空气源热泵的使用。这些水泵在温暖和温和的气候下是**有效的。然而，当室外温度显著下降(-20摄氏度和**更低)时，它们需要备用电热元件，这是一个昂贵的问题解决方案。因此，**净零家居设计的整体效率降低。**在这个项目中，将探索一种可能性，以一种方式来修改现有的供暖系统，以避免昂贵的供热元件**用于水泵。主要成果将是对这些**泵在室外温度为-20摄氏度及以下的良好控制的实验室条件下的性能系数进行评级，对埃德蒙顿几个家庭安装的寒冷气候空气源热泵进行现场**评估，并概述**如何在外部温度较低的情况下实现空气源热泵的高效率。该项目的**成果将对人居工作室对目前的改造和对未来家居设计的**改进做出重大贡献。如果泵的性能系数高于1.0，太阳能光伏(PV)系统所需的屋顶面积**可以减少。**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。为了提高Net-Zero家庭设计的效率**，非常需要泵在寒冷气候条件下的性能数据。更高效的家居设计对加拿大人来说具有长期的优势，因为它**减少了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.