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

在**阿尔伯塔省，天然气强制空气炉是单户、复式和排屋的主要热源。然而，熔炉的能源效率通常很低。空气源热泵（ASHP）技术**以其节能环保的优点在温和气候区被广泛接受。**然而，空气源热泵的效率随温度的升高而降低。电阻加热器被用作备用，以满足家庭在极冷天气下的供暖需求。然而，在像阿尔伯塔省这样的地方，从电力中获得1 **单位的热量的成本是天然气的2-3倍，导致公用事业账单和家庭作业的温室气体排放没有下降。混合空间供暖系统的原理是让空气源热泵在温和的日子里工作，而在寒冷的日子里使用天然气炉。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。在这方面，拟议的项目旨在通过以下方式提供技术解决方案：(1)确定在空气源热泵和炉子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，选择合适的空气源热泵和加热炉混合系统。

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.