Flexible heat pump integration to improve sustainable transition toward 4th generation district heating

Abokersh, Mohamed Hany; Saikia, Kangkana; Cabeza, Luisa F.; Boer, Dieter; Vallès, Manel

doi:10.1016/j.enconman.2020.113379

Cited by 44 publications

(13 citation statements)

References 61 publications

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“…To provide a general insight, Table 1 explains some key residential flexibility potentials and applications. (3) Reduction of energy consumption for heating system during peak hours [98] Maximizing profit of buildings through trading flexibility in intraday markets [99] (1) Minimization of life cycle cost (2) Reduction of environmental impacts of heat pumps and district heating [100] Improving power system frequency control [101] Refrigerator…”

Section: Residential Demand Flexibilitymentioning

confidence: 99%

Demand-Side Flexibility in Power Systems: A Survey of Residential, Industrial, Commercial, and Agricultural Sectors

Golmohamadi

2022

Sustainability

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In recent years, environmental concerns about climate change and global warming have encouraged countries to increase investment in renewable energies. As the penetration of renewable power goes up, the intermittency of the power system increases. To counterbalance the power fluctuations, demand-side flexibility is a workable solution. This paper reviews the flexibility potentials of demand sectors, including residential, industrial, commercial, and agricultural, to facilitate the integration of renewables into power systems. In the residential sector, home energy management systems and heat pumps exhibit great flexibility potential. The former can unlock the flexibility of household devices, e.g., wet appliances and lighting systems. The latter integrates the joint heat–power flexibility of heating systems into power grids. In the industrial sector, heavy industries, e.g., cement manufacturing plants, metal smelting, and oil refinery plants, are surveyed. It is discussed how energy-intensive plants can provide flexibility for energy systems. In the commercial sector, supermarket refrigerators, hotels/restaurants, and commercial parking lots of electric vehicles are pointed out. Large-scale parking lots of electric vehicles can be considered as great electrical storage not only to provide flexibility for the upstream network but also to supply the local commercial sector, e.g., shopping stores. In the agricultural sector, irrigation pumps, on-farm solar sites, and variable-frequency-drive water pumps are shown as flexible demands. The flexibility potentials of livestock farms are also surveyed.

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Section: Residential Demand Flexibilitymentioning

confidence: 99%

Demand-Side Flexibility in Power Systems: A Survey of Residential, Industrial, Commercial, and Agricultural Sectors

Golmohamadi

2022

Sustainability

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“…Norint pasiekti optimalias eksploatavimo sąlygas, tiekiamos šilumos tinklas turi būti eksploatuojamas kuo žemesnėmis srauto temperatūromis. Abokersh et al (2020) atliktame tyrime pabrėžiamas saulės šilumos energijos, sezoninio kaupimo ir ŠS kombinuotos konfigūracijos tinkamumas 4G kartos CŠT tinklams. Būsimi tyrimai turėtų būti sutelkti į šilumos paskirstymo tinklo optimizavimą ir galutinio vartotojo energijos vartojimo efektyvumo didinimą.…”

Section: įVadasunclassified

Research of Technological Possibilities of Heat Pumps’ Application in District Heating of Residential Buildings

Rogoža

Misevičiūtė

2022

Science - Future of Lithuania

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The main users of district heating (DH) systems are multi-apartment buildings – 53% of these buildings in Lithuania are supplied with heat from DH systems. Heating systems in buildings are the largest final consumer of energy, accounting for almost half of total energy consumption in many European countries. One of the measures planned for the Lithuanian energy policy in the heat sector of renewable energy sources (RES) until 2030 is the installation of heat pumps (HP) in the DH networks. The purpose of the study is to evaluate the technological possibilities of integrating HP into existing buildings to evaluate the low temperature heat supply. To evaluate the potential temperature lowering of the building heating system, a graph of the lowest possible building heating system temperatures is set, according to which the heat pump for the heating substation is selected, which would raise the temperature of the heat carrier supplied from DH networks to the required temperature for the heating and hot water systems of the building. Applying thermodynamic analysis, a mathematical model is developed that evaluates the ability of the HP to raise the temperature of the supplied heat carrier at the heat substation and determines the energy efficiency of such a solution. During the simulation, two alternatives of constant (regardless of outdoor air temperature) heat carrier temperatures supplied from DH networks were considered: 60 °C (alternative A) and 55 °C (alternative B). To adapt the most appropriate option for the integration of HP, it would be appropriate to combine both alternatives, i. y. to supply 60 °C from the DH network in the cold period of the year and 55 °C in the warm period of the year.

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“…As already highlighted in Table 3, the waste heat source temperatures considered in this study ranged between 40 • C and 80 • C, thus representing temperature levels usually dumped into the ambient. In the following, the selected working pairs (see Table 2) were investigated considering two possible final applications, namely upgrading waste heat to be used as primary source for low-temperature district heating network (DHN) applications and upgrading waste heat to be re-used in the industrial process above 100 • C. For the former application, waste heat sources ranging between 40 • C and 50 • C were considered, with the injection of 50-60 • C in the DHN as the target, according to the fourth-generation DHN temperature levels [33]. For the latter application, waste heat source at 80 • C was considered, in order to guarantee the provision of heat at temperatures above 100 • C, which can be efficiently exploited in several industrial processes (e.g., pasteurization, sterilization, concentration, drying, distillation etc.)…”

Section: Comparison Of the Different Working Pairsmentioning

confidence: 99%

Thermodynamic Performance of Adsorption Working Pairs for Low-Temperature Waste Heat Upgrading in Industrial Applications

2021

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The present work aims at the thermodynamic analysis of different working pairs in adsorption heat transformers (AdHT) for low-temperature waste heat upgrade in industrial processes. Two different AdHT configurations have been simulated, namely with and without heat recovery between the adsorbent beds. Ten working pairs, employing different adsorbent materials and four different refrigerants, have been compared at varying working boundary conditions. The effects of heat recovery and the presence of a temperature gradient for heat transfer between sinks/sources and the AdHT components have been analyzed. The achieved results demonstrate the possibility of increasing the overall performance when internal heat recovery is implemented. They also highlight the relevant role played by the existing temperature gradient between heat transfer fluids and components, that strongly affect the real operating cycle of the AdHT and thus its expected performance. Both extremely low, i.e., 40–50 °C, and low (i.e., 80 °C) waste heat source temperatures were investigated at variable ambient temperatures, evaluating the achievable COP and specific energy. The main results demonstrate that optimal performance can be achieved when 40–50 K of temperature difference between waste heat source and ambient temperature are guaranteed. Furthermore, composite sorbents demonstrated to be the most promising adsorbent materials for this application, given their high sorption capacity compared to pure adsorbents, which is reflected in much higher achievable specific energy.

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Flexible heat pump integration to improve sustainable transition toward 4th generation district heating

Cited by 44 publications

References 61 publications

Demand-Side Flexibility in Power Systems: A Survey of Residential, Industrial, Commercial, and Agricultural Sectors

Demand-Side Flexibility in Power Systems: A Survey of Residential, Industrial, Commercial, and Agricultural Sectors

Research of Technological Possibilities of Heat Pumps’ Application in District Heating of Residential Buildings

Thermodynamic Performance of Adsorption Working Pairs for Low-Temperature Waste Heat Upgrading in Industrial Applications

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