Analysis of low temperature lift heat pump application in a district heating system for flue gas condenser efficiency improvement

Zajacs, Aleksandrs; Bogdanovics, Raimonds; Borodiņecs, Anatolijs

doi:10.1016/j.scs.2020.102130

Cited by 27 publications

(10 citation statements)

References 17 publications

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“…CŠT yra perspektyvi, mažai CO 2 į aplinką išskirianti ateities technologija, jei šildymo sistemos temperatūrą galima sumažinti visose sistemos grandinės dalyse, pradedant šilumos gamyba ir baigiant šildymo sistemomis pastatuose (Østergaard et al, 2021). Šilumos tiekimas tampa efektyvesnis, jei taikoma kogeneracija (Lauka et al, 2015), kondensuojamos išmetamosios dujos (Zajacs et al, 2020), naudojami ŠS, geoterminė, žemos temperatūros perteklinė šiluma, vykdomas šilumos kaupimas. Šilumos paskirstymas tampa efektyvesnis dėl mažesnių paskirstymo nuostolių, mažesnio vamzdžių išsiplėtimo, nusiplikymo pavojaus bei plastikinių vamzdžių.…”

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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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 heating capacity of different heat pumps varies with the weather condition during the heating period, COP of the heat pump would be highly influenced by the temperature lift, and quality of heat sources and annual utilization ratio would play crucial role in influencing energy and economic feasibility of heat pump applications [44]. However, practical heating system operation is rarely monitored and compared in detail.…”

Section: Literature Reviewmentioning

confidence: 99%

Field Investigation and Comparison Analysis of Low-Grade Heat Pump Technologies in Building Space Heating Projects

Li¹,

Gao²,

Zhang³

et al. 2022

Energy Engineering

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“…Šios koncepcijos nauda yra ir ta, kad CŠT šilumnešio srautas į šilumos siurblį taip pat užtikrina momentinį šilumokaičio karšto vandens pašildymą (Yang, 2016). Tiek centrinis, tiek individualus šilumos siurblys, utilizuodamas grįžtamosios CŠT linijos šilumą ir sumažindamas grįžtančiojo šilumnešio temperatūrą, gali būti naudojamas CŠT sistemose siekiant pagerinti šilumos šaltinio degimo produktų ekonomaizerio efektyvumą (Zajacs et al, 2020), tai dar labiau padidina ir bendrą CŠT sistemos efektyvumą.…”

Section: įVadasunclassified

Case Analysis of Heat Pump Integration in District Heating System

Rogoža

Šiupšinskas

Bielskus

2021

Science - Future of Lithuania

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The installation of heat pumps in district heating (DH) systems is one of the most promising technologies to increase the efficiency of heat supply by using renewable energy sources and reducing heat carrier temperatures in the networks. The possibilities of installing heat pumps in DH systems are very wide, but most often the main purpose of their application is to increase the temperature of the supplied heat carrier at the heat substations of individual consumers or their groups. This paper describes a study that analyzed the possibilities of integrating an individual heat pump at a heat substation in a building to reduce the temperature of the heat carrier in the return line. The results of the study revealed the dependences of the reduction of the heat demand of the building from the DH network, the power of the heat pump, the coefficient of performance (COP), and the reduction of the return temperature.

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Analysis of low temperature lift heat pump application in a district heating system for flue gas condenser efficiency improvement

Cited by 27 publications

References 17 publications

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

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

Field Investigation and Comparison Analysis of Low-Grade Heat Pump Technologies in Building Space Heating Projects

Case Analysis of Heat Pump Integration in District Heating System

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