Efficient use of heat from CHP distributed by district heating system in district cooling networks

Pieper, Henrik; Kirs, Tanel; Krupenski, Igor; Ledvanov, Aleksandr; Lepiksaar, Kertu; Volkova, Anna

doi:10.1016/j.egyr.2021.09.041

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…In the Ülemiste district of Tallinn, a DC network is being constructed that will use the excess heat from the Tallinn CHP plant [33]. According to the absorption chiller datasheet, the cooling capacity corresponds to the temperature at the hot water inlet, where a 39% loss in cooling capacity is indicated when the driving hot water temperature is lowered to 77 • C. This study hereby investigates the roots of these problems.…”

Section: Introductionmentioning

confidence: 99%

Effects of Coupling Combined Heat and Power Production with District Cooling

et al. 2023

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Over the past decades, combined heat and power production (CHP) has proven itself to be an efficient means of meeting both heat and power demands. However, high efficiency can be achieved with CHP plants when the heat load is sufficient, while lower-priority CHP plants must deal with the excess heat associated with power generation. This excess heat can be used for district cooling with absorption chillers. Although the absorption chiller is an efficient technology for using excess heat for cooling generation, its efficiency is very sensitive to driving hot water temperature. This paper provides a detailed analysis of how cooling generation in CHP plants using absorption chillers affects power generation and primary energy consumption. This study is based on the operational parameters of the Mustamäe CHP plant (Tallinn, Estonia) and the cooling demand of the Tehnopol science and business campus and proposes a sufficient cooling production capacity based on the estimation of the campus’ cooling demand. Additional cooling production opportunities to meet district cooling demand are discussed and compared in this paper in terms of primary energy savings and economic profit. The study finds that for the effective use of CHP excess heat and efficient cooling production, the use of an 0.8 MW absorption cooler and 11.6 MW heat pumps is recommended. This system would use 1.9 times less primary energy for cooling generation than local cooling.

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Section: Introductionmentioning

confidence: 99%

Effects of Coupling Combined Heat and Power Production with District Cooling

et al. 2023

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“…The next cluster in yellow focuses on heating and cooling appliances with keywords such as "heating", "cooling systems", and "absorption cooling". In this cluster, we can also find the keywords "carbon dioxide emissions" and "renewable energy" which demonstrate the efforts being made to transform the energy demand matrix of these highly energyintensive appliances into renewable energy [23][24][25][26].…”

Section: Analysis Of Abstractmentioning

confidence: 99%

Trends in Research on Energy Efficiency in Appliances and Correlations with Energy Policies

2022

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According to the Intergovernmental Panel on Climate Change (IPCC) 5th Assessment report, energy-efficient appliances can reduce global electricity consumption even though there is an expected increase in the number and ownership of appliances. The International Energy Agency (IEA) expects a high increase in energy efficiency in traditional appliances (refrigerators, washing machines, television, etc.), and in the number of new appliances installed (also called plug loads). The bibliometric study of publications related to energy-efficient appliances carried out in this paper shows that research on this topic is growing in developed regions (North America and Europe) and even more in some developing regions (Asia Pacific) with a high emphasis on China and India. The results indicate that, in general, policies are always implemented before the core of publications on the topic, with time spans ranging from 3 to 30 years. However, the trend seems to be changing with publications related to new appliances where the core research happens shortly after or in parallel to the establishment of policies.

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“…In the case of Tallinn, the second priority option after free cooling will be the cold supply using the heat rejected by biomass CHPs in the summer. Cold supply via absorption chillers using rejected heat from a CHP that was transferred through the district heating network was analysed in detail in a previous study [25].…”

Section: Cold Supply Planning For District Coolingmentioning

confidence: 99%

“…A heat pump evaporator can be used for cooling in a district cooling system while simultaneously producing heat in the district heating system [24]. Another option is to use summer excess heat from combined heat and power (CHP) plants to produce cold via absorption chillers [25][26][27]. This is a good solution, as the CHP plants would otherwise have to be shut down due to the lack of summer heat load.…”

Section: Introductionmentioning

confidence: 99%

“…There are examples of district cooling based, in part, on free cooling from natural sources, e.g. rivers (Pärnu and Tartu), as well as district cooling based on compressor chillers (Tallinn) [25]. Despite the fact that Tallinn, the country's most populous city, is located by the sea, there are no examples of seawater-based district cooling in Estonia.…”

Section: Introductionmentioning

confidence: 99%

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District Cooling Network Planning. A Case Study of Tallinn

Volkova

Hlebnikov²,

Ledvanov

et al. 2022

IJSEPM

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The planning procedure for district cooling as an urban system was presented and carried out using the example of the Tallinn city centre. The following steps were described in detail: cooling demand determination, cooling generation planning and cooling transition analysis. Based on the three proposed methods (average specific cooling load, satellite imagery analysis of a specific building, counting the number of fans in dry coolers and the combination method), the cooling capacity of the evaluated district was estimated at 63.2 MW. In terms of cooling generation, the analysis shows that seawater for free cooling can cover up to 55% of the annual cooling consumption. Electric chillers and absorption chillers that use surplus heat can cover the rest of the district cooling demand. The district cooling network was designed for three scenarios: with one generating unit, with two generating units and a looped network. Despite the fact that the looped network is the most expensive option, this type of solution is considered feasible as it will make it easier to connect new consumers.

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Efficient use of heat from CHP distributed by district heating system in district cooling networks

Cited by 13 publications

References 8 publications

Effects of Coupling Combined Heat and Power Production with District Cooling

Effects of Coupling Combined Heat and Power Production with District Cooling

Trends in Research on Energy Efficiency in Appliances and Correlations with Energy Policies

District Cooling Network Planning. A Case Study of Tallinn

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