Realizing the potential of renewable energies in existing and new urban areas can reduce the fossil energy consumption of cities and the corresponding greenhouse emissions. In this paper, four different urban forms in the city of Constantine, a cold semi-arid city in Algeria, are analysed. Using the Citysim model, calibrated against local electricity and gas demand, and weather data taken from Meteonorm7.0, for both present and future climates, the study shows a significant difference between the energy demands of the urban forms due to their typo-morphological indicators. It is also shown that a small area of photovoltaics on rooftops can supply building demand, highlighting the favorable solar potential for the location. Future climate projections, for 2050, within the lifetime of many buildings, are expected to lead to higher energy demand, particularly in the summer. The increase in photovoltaic capacity to address that higher demand will open the opportunity to replace a significant fraction of gas usage with solar-powered heat pumps in the heating season.

认识到现有和新市区的可再生能源潜力，可以减少城市的化石能源消耗和相应的温室气体排放。本文分析了阿尔及利亚寒冷半干旱城市君士坦丁市的四种不同城市形态。使用针对当地电力和天然气需求进行校准的Citysim模型，以及从Meteonorm7.0获取的针对当前和未来气候的天气数据，该研究表明，由于城市的形态特征指标，城市形式的能源需求之间存在显着差异。还表明，屋顶上的一小部分光伏电池可以满足建筑需求，突出了该位置的良好太阳能潜力。在许多建筑物的使用寿命内，对2050年的未来气候预测预计将导致更高的能源需求，特别是在夏天。为满足更高的需求，光伏容量的增加将为在供暖季节用太阳能热泵取代大量用气提供机会。