Evaluating the cost of heat for end users in ultra low temperature district heating networks with booster heat pumps

Vivian, Jacopo; Emmi, Giuseppe; Zarrella, Angelo; Jobard, Xavier; Pietruschka, Dirk; Carli, Michele De

doi:10.1016/j.energy.2018.04.081

Cited by 68 publications

(29 citation statements)

References 14 publications

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“…The results showed that the proposed design of the ULTDH system has a better performance compared to the existing methods in terms of energy, exergy, and economy due to substantial savings from the distribution heat loss. Vivian et al [16] evaluated the cost of heat for the end-users in ULTDH networks. It was concluded that the system is already competitive with individual gas boilers if a local low-temperature heat source can be recovered with minor marginal costs.…”

Section: Introductionmentioning

confidence: 99%

Thermal-Hydraulic Performance Analysis of Twin-Pipes for Various Future District Heating Schemes

Khosravi

Arabkoohsar

2019

Energies

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Future energy systems will come with a 100% share of renewable energy and high integration of energy systems. District heating and cooling systems will be undeniable parts of the future energy systems, as they pave the bed for high-efficiency, low cost, and clean production. District heating systems may come into a wide range of designs in the future. Currently, most of the world’s district heating systems are based on the third generation design while everything in this framework is on the verge of a transition to the fourth generation. A large number of technologies for the future district heating systems has been proposed so far, among which low-, ultralow- and variable-temperature systems seem more of qualification. This study employs computational fluid dynamics to make a comprehensive examination of the compatibility of regular twin-pipes with various potential district heating schemes for future energy systems. The results show that both low- and ultralow-temperature systems could efficiently use regular twin-pipes commonly used in the third generation district heating systems, though the insulation of the pipe could be proportionally strengthened based on a techno-economic trade-off. In contrast, the results show that the thermal inertia of the pipe does not allow the variable-temperature district heating system to effectively operate when the transmission pipeline is longer than a limited length. Therefore, a regular heat distribution network may not be an appropriate host for a variable-temperature district heating scheme unless decentralized heat production units come into service.

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Section: Introductionmentioning

confidence: 99%

Thermal-Hydraulic Performance Analysis of Twin-Pipes for Various Future District Heating Schemes

Khosravi

Arabkoohsar

2019

Energies

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“…The strength factors "Sector coupling" and "Contribution to the decarbonization of the heating sector" were given a low global and local priority by both expert groups, even though these internal strengths are described as a core feature of 4GDH in the literature [4,6,33]. The economic performance of district heating systems compared to concurrent technologies has been widely discussed in the literature [39,[46][47][48]. The experts consider the "Cost efficiency in the short and middle term" as a weakness of 4GDH.…”

Section: Figurementioning

confidence: 99%

District Heating Systems: An Analysis of Strengths, Weaknesses, Opportunities, and Threats of the 4GDH

2019

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Fourth-generation district heating networks (4GDH) can play a special role in the efficient and climate-friendly use of energy. In this study, we have examined the strengths, weaknesses, opportunities, and threats (SWOT) of this innovative technology. Using a combination of qualitative and quantitative research methods, we assessed the SWOT-factors in terms of their importance. Among the factors that were weighted with the highest relative importance were the ability of 4GDH to serve as a label bundling and stimulating considerations with respect to the further development of district heating systems and the increased value creation within the national economy through the inclusion of local, renewable energy sources. Moreover, the interviewed experts agreed that regulatory frameworks in the context of 4GDH have to be further developed.

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“…Secondly, 4GDH brings an idea of distributing heat at temperature below 45°C and using a heat pump at a consumer substation to provide the appropriate temperature required for space heating (SH) and DHW production [6]. If multiple heat pumps are installed, the seasonal coefficient of performance (SCOP) of the entire system may be calculated as a weighted average of the SCOPs of the reference buildings, using the energy needs as weights [7].…”

Section: Introductionmentioning

confidence: 99%

Advanced Control of a District Heating System with High Residential Domestic Hot Water Demand

2020

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Proper adjustment of domestic hot water (DHW) load structure can balance energy demand with the supply. Inefficiency in primary energy use prompted Omsk DH company to be a strong proponent of a flow controller at each substation. Here the return temperature is fixed to the lowest possible value and the supply temperature is solved. Thirty-five design scenarios are defined for each load deviation index with equally distributed outdoor temperature ranging from +8 for the start of a heating season towards extreme load at temperature of -26°C. All the calculation results are listed. If a flow controller is installed, the customers might find it suitable to switch to this type of DHW supply. Considering an option with direct hot water extraction as usual and a flow controller installed, the result indicates that the annual heat consumption will be lower once network temperatures during the fall or spring months are higher. The heat load profiles obtained here may be used as input for a simulation of a DH substation, including a heat pump and a tank for thermal energy storage. This design approach offers a quantitative way of sizing temperature levels in each DH system according to the listed methodology and the designer's preference.

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Evaluating the cost of heat for end users in ultra low temperature district heating networks with booster heat pumps

Cited by 68 publications

References 14 publications

Thermal-Hydraulic Performance Analysis of Twin-Pipes for Various Future District Heating Schemes

Thermal-Hydraulic Performance Analysis of Twin-Pipes for Various Future District Heating Schemes

District Heating Systems: An Analysis of Strengths, Weaknesses, Opportunities, and Threats of the 4GDH

Advanced Control of a District Heating System with High Residential Domestic Hot Water Demand

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