University of Tehran Journal of Solar Energy Research 2588-3097 8 2 2023 04 01 Simultaneous Production of Heat Required for Space Heating, Sanitary Water Consumption, And Swimming Pool in Different Climates of Iran 1393 1409 91077 10.22059/jser.2023.349797.1260 EN Ali Zarouri Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran Somaye Yaghoubi Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran Mehdi Jahangiri Energy research center, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran Journal Article 2022 10 12 Due to the increasing reduction of fossil energies such as oil and gas and the pollution caused by these fuels' consumption, nowadays the use of renewable energies to meet energy needs has been considered, and solar energy is one of the cheapest and cleanest of them. The share of energy consumption in the building sector is very high and is about 40% of the country's total energy consumption, and the implementation of projects to reduce energy consumption in this sector is very significant in terms of cost, and the goals of reducing energy consumption in this sector can be achieved at a lower price. In this study, for the first time, the production of part of the required heat of a residential building with a pool and sanitary water consumption in different climates of Iran was investigated by Valentin T*SOL 2018 R(4) software in two separate solar heating systems and 4 cities of Isfahan, Babolsar, Tabriz, and Abadan. The results showed that the city of Tabriz performed better in system #1 and Isfahan and Tabriz in system #2.  For all 4 cities, system #2 has a higher efficiency than system #1. https://jser.ut.ac.ir/article_91077_678fbf02dbddefc9297f9baaef7a7719.pdf