Design of a hybrid space heating system for residential buildings in cold climate regions

天然气强制通风炉是**艾伯塔省单户住宅、复式住宅和排屋的主要热源。然而，熔炉的能源效率通常较低。空气源热泵（ASHP）技术**因其节能环保的优点在温和气候地区被广泛接受。**但空气源热泵的效率随着温度的升高而降低。电阻加热器用作备用设备，以满足极冷天气下家庭的供暖需求。然而，在艾伯塔省等地，从电力获取一**单位热量的成本是从天然气获取热量的 2-3 倍，导致家庭运营的公用事业费用和温室气体 ** 排放量并没有下降。混合空间供暖系统的原理是让**空气源热泵在温和的天气里工作，而在寒冷的天气里使用天然气炉。 **建筑行业迫切需要使混合空间供暖系统适用于寒冷气候**地区的住宅应用。就此而言，拟议项目旨在通过以下方式提供技术解决方案：(1) 确定 ASHP 和熔炉之间切换的临界**温度，以最大限度地减少**家庭运营中的公用事业费用和温室气体排放； (2) 针对不同类型的住宅**建筑调整 ASHP 和熔炉混合系统的规模。

Natural gas forced-air furnaces are the major heating sources for single-family, duplex and row houses in**Alberta. However, the energy efficiency of furnaces is normally low. Air source heat pump (ASHP) technology**is widely accepted for the merits of energy-saving and environmental protection in the mild climate zone.**However, the efficiency of ASHP decreases with temperature. An electrical resistance heater is used as a**backup to meet home's heating needs in extremely cold weather. However, in places like Alberta, obtaining one**unit of heat from electricity costs 2-3 times more than from natural gas, leading to that the utility bill and GHG**emissions from home operations do not go down. The principle of a hybrid space heating system is to let an**ASHP work in mild days while using natural gas furnaces in cold days. There is an immediate demand for**building industry to make a hybrid space heating system feasible for residential applications in cold climate**zone. In this regard, the proposed project aims to provide a technical solution by (1) determining of the critical**temperature to switch between ASHP and furnaces in order to minimize the utility bill and GHG emissions in**home operations; and (2) right sizing the ASHP and furnace hybrid system for different types of residential**buildings.