Iranian Society of Heating, Refrigerating, and Air Conditioning Engineers (IRSHRAE) Journal of Renewable and New Energy 2423-4931 3 1 2016 03 20 Economic and environmental analysis of replacement of natural gas heating system with geothermal heat pump in district 11 of Tehran Economic and environmental analysis of replacement of natural gas heating system with geothermal heat pump in district 11 of Tehran 1 6 49049 FA Hossein Yousefi Department of Renewable Energy and Environment, Faculty of New Sciences and Technologies, University of Tehran, Iran *P.O.B.1439957131 Tehran, Iran 0000-0002-6372-5127 Soheil Roumi M.S. student, New Sciences and Technologies, University of Tehran, Iran Sanaz Tabasi M.S. student, New Sciences and Technologies, University of Tehran, Iran Maryam Hamlehdar M.S. student, New Sciences and Technologies, University of Tehran, Iran Journal Article 2017 08 01 Considering the fact that fossil fuels resources with their extreme environmental contaminants are coming to an end, clean and renewable energy utilization is taken into account. One of the simplest renewable energy resources which can also be used for heating and cooling is ground source heat pump (GSHP). Not only natural gas utilization is very costly because of subsidies for Iranian government, but also imposes massive amount of air pollution into the atmosphere and causes external costs as well. In this paper, by modeling the buildings which are having construction permission in district 11 of Tehran city by 2014, the exchange of GSHP's with common systems by government support is studied. The results showed that by using GSHP in each year, more than 100'568 tons of air pollutant is prevented to be spread and the amount of reduced environmental costs due to contaminant is estimated to be 641'364 S. Besides, 12'931'360 cubic meters of natural gas can be saved annually. Regarding to gas exportation price in 2014, 3'232 840 $ profit will be gained from gas exportation. After all, Iranian government strategies to encourage households in order to apply this system are discussed. It is found with government supports for using GSHP's, the rate of return will be changed from 18 years (with no governmental support) to less than 2 years. Considering the fact that fossil fuels resources with their extreme environmental contaminants are coming to an end, clean and renewable energy utilization is taken into account. One of the simplest renewable energy resources which can also be used for heating and cooling is ground source heat pump (GSHP). Not only natural gas utilization is very costly because of subsidies for Iranian government, but also imposes massive amount of air pollution into the atmosphere and causes external costs as well. In this paper, by modeling the buildings which are having construction permission in district 11 of Tehran city by 2014, the exchange of GSHP's with common systems by government support is studied. The results showed that by using GSHP in each year, more than 100'568 tons of air pollutant is prevented to be spread and the amount of reduced environmental costs due to contaminant is estimated to be 641'364 S. Besides, 12'931'360 cubic meters of natural gas can be saved annually. Regarding to gas exportation price in 2014, 3'232 840 $ profit will be gained from gas exportation. After all, Iranian government strategies to encourage households in order to apply this system are discussed. It is found with government supports for using GSHP's, the rate of return will be changed from 18 years (with no governmental support) to less than 2 years. https://www.jrenew.ir/article_49049_269dce383b169909785f4fda1ed47913.pdf