Exergoeconomic analysis of district heating system boosted by the geothermal heat pump

Arat, Halit; Arslan, Oğuz

doi:10.1016/j.energy.2016.11.073

Cited by 54 publications

(19 citation statements)

References 32 publications

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“…Moreover, its evaporation heat is about 20% higher than that of R134a. HFO-1234ze(Z) is characterized by a high normal boiling temperature (9.73 • C) and a high critical temperature of 150.12 • C. Thus, it is suitable for high-temperature heat pumps [31][32][33]. However, the use in refrigeration cannot only be limited to favorable condensing conditions, therefore, HFO-1234ze(Z) is used to create new refrigerant blends with a wider range of applications.…”

Section: General Description Of Hydrofluoroolefinsmentioning

confidence: 99%

Efficiency Evaluation of the Ejector Cooling Cycle using a New Generation of HFO/HCFO Refrigerant as a R134a Replacement

Gil

Kasperski

2018

Energies

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Theoretical investigations of the ejector refrigeration system using hydrofluoroolefins (HFOs) and hydrochlorofluoroolefin (HCFO) refrigerants are presented and discussed. A comparative study for eight olefins and R134a as the reference fluid was made on the basis of a one-dimensional model. To facilitate and extend the possibility of comparing our results, three different levels of evaporation and condensation temperature were adopted. The generator temperature for each refrigerant was changed in the range from 60 °C to the critical temperature for a given substance. The performed analysis shown that hydrofluoroolefins obtain a high efficiency of the ejector system at low primary vapor temperatures. For the three analyzed sets of evaporation and condensation temperatures (te and tc equal to 0 °C/25 °C, 6 °C/30 °C, and 9 °C/40 °C) the maximum Coefficient of Performance (COP) was 0.35, 0.365, and 0.22, respectively. The best performance was received for HFO-1243zf and HFO-1234ze(E). However, they do not allow operation in a wide range of generator temperatures, and, therefore, it is necessary to correctly select and control the operating parameters of the ejector.

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Section: General Description Of Hydrofluoroolefinsmentioning

confidence: 99%

Efficiency Evaluation of the Ejector Cooling Cycle using a New Generation of HFO/HCFO Refrigerant as a R134a Replacement

Gil

Kasperski

2018

Energies

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“…Arat et al analyzed the assumed technological and economic performance of geothermal heating in a residential area in a medium-sized Turkish city driven by a heat pump. If the most cost-efficient solution is selected, the system will maximize the Net Present Value (NPV) when it serves between 7929 and 36,098 households [6].…”

Section: Literature Reviewmentioning

confidence: 99%

Water-Thermal Energy Production System: A Case Study from Norway

Idsø

Årethun

2017

Sustainability

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Abstract:The purpose of this paper is to describe a new way of producing renewable energy based on fjords as a water heater. We will call this system the Water-thermal Energy Production System (WEPS), because the basic idea is to extract heating and cooling energy from water. Although a prototype of WEPS has existed in Norway for more than ten years, a WEPS currently in operation has not been financially analyzed in the literature. Coastal parts of Norway have a potential of 5 TWh of profitable WEPS-facilities, due to convenient access to fjords containing water with stable all-season temperatures of about 4-12 • C when the depth of the water is about 50 m. This stability of the water temperature makes it possible to extract energy from the fjord in a very efficient way. The potential for economically-profitable WEPS in other parts of the world has not been estimated. In order to answer such a question, more research is required. We have conducted a case study of a WEPS located in the Norwegian municipality of Eid. This is the first full-scale Norwegian WEPS, and it has been operating since 2006. The nascent years have passed, and the technology has been in operation for some years. In this paper, we have made an estimate of the business profitability and the external effects based on past empirical evidence and some assumptions about future development in some key figures. The results suggests that WEPS-Eid has been a profitable investment carrying a positive internal rate of revenue, even if the present underutilization in production capacity will continue in the future. Stability in energy prices for heating purposes has also gained customers compared to the more volatile prices of alternative renewable energy, such as hydropower or wind turbines. The negative, external effects in the operating phase from WEPS-Eid are insignificant. Despite the significant profitability of the WEPS facility in Eid, there are two main obstacles for new entrants. There is a lack of relevant operational information for potential investors due to few facilities. This leads to uncertainty, and investments in WEPS appear as a risky business. Secondly, construction of a WEPS requires both big financial investments in digging and facilitating long trenches for a pipeline system and time and effort spent on acquiring the licenses needed for doing this work. A coordinating unit is probably required in order to get the necessary public and private licenses and to reduce fixed costs by coordinating other tasks in the same trenches, such as pipes for water and sewer, fiber cables and tele-cables. In Eid, the local municipal administration was the coordinating unit.

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“…For example, most recently, David et al [2] and Arat and Arslan [3] in 2017 demonstrated the use of large-scale GHP systems for district heating. Liu et al [4] in 2015 investigated the feasibility and performance of GHP systems used in three cold-climate regions of China, and they found that Beijing, as one of the three investigated regions, is the most suitable city for GHP systems, compared to the other two cities, i.e.…”

Section: Introductionmentioning

confidence: 99%

Recent Development and Application of Geothermal Heat Pump Systems in Cold-Climate Regions of the US: A Further Investigation

Yu¹,

Miao²,

Miller³

et al. 2017

ENG

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A Geothermal Heat Pump (GHP) system is known to have enormous potential for building energy savings and the reduction of associated greenhouse gas emissions, due to its high Coefficient Of Performance (COP). The use of a GHP system in cold-climate regions is more attractive owing to its higher COP for heating compared to conventional heating devices, such as furnaces or boilers. Many factors, however, determine the operational performance of an existing GHP system, such as control strategy, part/full-load efficiency, the age of the system, defective parts, and whether or not regular maintenance services are provided. The omitting of any of these factors in design and operation stages could have significant impacts on the normal operation of GHP systems. Therefore, the objectives of this paper are to further investigate and study the existing GHP systems currently used in buildings located in coldclimate regions of the US, in terms of system operational performance, potential energy and energy cost savings, system cost information, the reasons for installing geothermal systems, current operating difficulties, and owner satisfaction to date. After the comprehensive investigation and in-depth analysis of 24 buildings, the results indicate that for these buildings, about 75% of the building owners are very satisfied with their GHP systems in terms of noise, cost, and indoor comfort. About 71% of the investigated GHP systems have not had serious operating difficulties, and about 85% of the respondents (building owners) would suggest this type of system to other people. Compared to the national median of energy use and energy cost of typical buildings of the same type nationwide, the overall performance of the actual GHP systems used in the cold-climate regions is slightly better, i.e. 626energy savings and 6.1% energy cost savings on average.

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Exergoeconomic analysis of district heating system boosted by the geothermal heat pump

Cited by 54 publications

References 32 publications

Efficiency Evaluation of the Ejector Cooling Cycle using a New Generation of HFO/HCFO Refrigerant as a R134a Replacement

Efficiency Evaluation of the Ejector Cooling Cycle using a New Generation of HFO/HCFO Refrigerant as a R134a Replacement

Water-Thermal Energy Production System: A Case Study from Norway

Recent Development and Application of Geothermal Heat Pump Systems in Cold-Climate Regions of the US: A Further Investigation

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