Method to investigate and plan the application of low temperature district heating to existing hydraulic radiator systems in existing buildings

Tunzi, Michele; Østergaard, Dorte Skaarup; Svendsen, Svend; Boukhanouf, Rabah; Cooper, Edward

doi:10.1016/j.energy.2016.07.033

Cited by 56 publications

(34 citation statements)

References 19 publications

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“…Building renovation was not taken into account in this study. In addition, the average heat gains from occupants and equipment can be assumed as 0.81 and 1.55 W/m 2 respectively [34]. If those heat gains were added, the oversizing of radiators would increase 5~10 %, the final value of oversizing will range from 21 to 27%.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

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Operation strategies to achieve low supply and return temperature in district heating system

Nord

2019

E3S Web Conf.

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Low temperature is the most significant feature of the future district heating (DH) - the 4th generation district heating (4GDH). The revolutionary temperature level (50–55/25°C) will improve the efficiency of heat sources, thermal storages, and distribution systems, meanwhile, bring huge potentials to renewable energies. One challenge of transition to the future DH is the compatibility of current customer installations and the future temperature level. The aim of this study was to find the temperature potential of Norwegian residential buildings for the future DH system. A reference apartment was created, and typical space heating (SH) system was designed. A detailed building and SH system model were built in Modelica® language, and simulation was conducted via Dymola environment. Different operation strategies: PI control of the supply temperature, weather compensated control of the supply temperature, and PI control of the return temperature were tested. The results of the study showed the average supply temperature could be as low as 56~58°C, and only limited time the temperature was above 60 °C, when the controlled supply temperature strategies were applied. For the case with controlled return temperature strategies, the average return temperature were 30 and 37°C, while the average required supply temperature could be 72 and 94°C. The conclusion was that the low supply temperature could be achieved through optimized operation strategies. Whereas, the low return temperature was not able to be achieved only by improving the operation strategy.

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Section: Conclusion and Discussionmentioning

confidence: 99%

“…Some DH companies incentivize their customers through motivation tariffs to reduce their temperatures in exchange of discount in their energy bills. Researches show that low return temperature has higher economic benefits, and DH companies care more about low return temperature than low supply temperature [34].…”

Section: Scenariosmentioning

confidence: 99%

Operation strategies to achieve low supply and return temperature in district heating system

Nord

2019

E3S Web Conf.

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“…This circumstance is caused by the fact that the comfort temperature is not maintained inside that leads to overheating and excessive fuel consumption. Works [8][9][10][11][12] show the positive use of thermostatic valves on heating radiators. And the article [13] gives the analysis of the control quality of a thermostatic valve.…”

Section: Discussionmentioning

confidence: 99%

Balancing fittings in a water heating system

et al. 2019

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Energy conservation and improving energy efficiency are priority areas for the development of the global economy. The need to increase the energy efficiency of the engineering equipment of buildings is due to both the requirements to reduce the energy consumption of buildings in general, and the increase in the proportion of energy-consuming climate systems used in modern construction. In large modern office, hotel and residential complexes to achieve the greatest energy efficiency it is necessary to use various technical solutions. The main element of an energy-efficient heating system is regulation. Balancing devices allow to not only balance and tune the system at any time of operational period but also serve as stop valves during reparation and diagnostics. Determination of energy savings bases on the average value heat consumption before and after modernization, depending on the type of installed valves or their combination. The focus of the work is hydraulic calculation of the heating system the authors conduct research on the effect of differently balancing fittings on the hydraulics of the heating system.

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“…Sameti and Haghighat [19] demonstrated that additional energy savings in district heating systems can be achieved by expanding heat exchange among several buildings, which can lead to a 25 % reduction in annual costs. Whereas Tunzi et al [20] investigated the application of LTDH to hydraulic radiators by adjusting temperatures according to demand, and found that it can lead to a discount of 14 % to 16 % in annual energy bills.…”

Section: Introductionmentioning

confidence: 99%

Empirical Model of Cost Reduction in Local DH Systems. Low Temperature Approach

Blumberga

Gulbis

Ievina

et al. 2019

Environmental and Climate Technologies

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Improving the efficiency of heating systems can give a tremendous contribution towards the EU energy efficiency target for 2030. Significant heat losses are one of the main disadvantages of the dominating high temperature district heating (DH). Even in summer, the high retention time of water in the network leads to thermal losses from domestic hot water reaching up to about 30 %. An empirical model based on experimental data of heat energy consumption in multi-apartment buildings is created for economical optimization of the operation of DH systems. A methodology has been developed that allows estimating the total energy cost savings (including losses) of buildings associated with the reduction of heat loss in the system, by reducing the supply flow temperature, and increasing electricity consumption by increasing the mass flow rate of water in the network.

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Method to investigate and plan the application of low temperature district heating to existing hydraulic radiator systems in existing buildings

Cited by 56 publications

References 19 publications

Operation strategies to achieve low supply and return temperature in district heating system

Operation strategies to achieve low supply and return temperature in district heating system

Balancing fittings in a water heating system

Empirical Model of Cost Reduction in Local DH Systems. Low Temperature Approach

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