Temperature optimization in district heating systems

Lauenburg, Patrick

doi:10.1016/b978-1-78242-374-4.00011-2

Cited by 26 publications

(27 citation statements)

References 6 publications

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“…In Sweden, district heating (DH) accounts for approximately 60% of the bought energy for heating purposes for the residential and service sectors (Frederiksen & Werner, 2013). The customers connected to the DH system are mainly buildings which utilize the heat for space heating (SH) and generation of domestic hot water (DHW) (Lauenburg, 2016).…”

Section: District Heatingmentioning

confidence: 99%

“…The DH technology has since it was first introduced undergone different stages of development as well as efficiency improvements, where each generation has been state of the art for approximately 40-50 years (Lauenburg, 2016). The current joint efforts, among others within the European Union, to eliminate the negative environmental impacts from heat and power generation are strongly influencing how energy systems of the future are being shaped.…”

Section: Introductionmentioning

confidence: 99%

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Survey of radiator temperatures in buildings supplied by district heating

Jangsten

Kensby

Dalenbäck

et al. 2017

Energy

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In order to maintain the competitiveness and improve the environmental performance of district heating in the future it may be of essence to transition to lower operating temperatures over those of the current third generation district heating systems. This is due to the fact that heat demands are expected to decrease as buildings become more energy efficient as well as new types of heat sources are likely to be integrated. The third generation district heating systems operate at annual average temperatures of 75-90°C supply and 40-50°C return in Sweden today. However, these temperatures are well above the customer temperature demands which are to heat buildings to approximately 20°C and provide domestic hot water at 50°C. Therefore, future supply and return temperatures of 50-55/20-30°C for the next fourth generation district heating systems have been suggested.

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Section: District Heatingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Survey of radiator temperatures in buildings supplied by district heating

Jangsten

Kensby

Dalenbäck

et al. 2017

Energy

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“…In Sweden, district heating systems are the most common hot water generation system which is used for both domestic hot water and water heating system application. The highest design temperatures for the common district heating system in Sweden is about 90/70 • C and 80/60 • C for supply and return temperature, respectively [14]. However, due to the revision of Swedish building codes, the radiator design supply temperature is restricted and must be lower than 55 • C for most cases but no more than 60 • C in special cases [15].…”

Section: Radiatorsmentioning

confidence: 99%

Heat Supply Comparison in a Single-Family House with Radiator and Floor Heating Systems

2019

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Floor heating and radiators are two of the most common types of hydronic heating systems used for space heating in single-family houses in cold climate regions. Notwithstanding, there are few comparative studies on indoor temperature distribution and system cost evaluations for radiators and floor heating. Furthermore, there are no aligned outcomes in terms of total heat supply for a single-family house with radiators or floor heating. In this study, the effect of building energy efficiency level and construction type, including flooring material, on the supply heating demand and transmission heat losses were studied for both radiator and floor heating systems. For this purpose, a single-family house located in Växjö, Sweden, was modeled as a case study. The heating demand was supplied with a district heating system with a similar supply temperature at 45 °C for both the radiator and floor heating system. A sensitivity analysis was also performed to assess the effect of flooring configurations on the annual supply heating demand for both conventional and passive versions of the case-study building. The results showed that the radiator-integrated building had a lower supply heating demand in comparison with the floor heating-integrated buildings. Based on the sensitivity studies, the flooring material did not have a significant influence on the supply heating demand and on the transmission heat losses in the case of the radiators. The supply heating demand was only reduced up to 3% if the flooring U-value was improved by 60%. The results also showed that refurbishment in a standard conventional building with a radiator heating system based on the passive criteria led to a 58% annual energy savings, while this amount for a building with a floor heating system was approximately 49%.

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“…This leads to over-sizing systems and guarantees a larger surface area, in the case of radiators, and a positive effect when lowering temperatures [14], [15], [21], [40]. Lauenburg [41] showed that heating systems sized for design temperatures only required full load during a short period when outdoor temperatures are very low, demonstrating that for most of the heating season consistently lower water supply temperatures can be appropriate to meet the heat demand. The reliability of software outputs is crucial because it provides a powerful tool for professionals at the time of investigating and foreseeing the use of low temperatures to existing hydraulic radiators.…”

Section: Modelling Part -Calculation Of Heating Demand Of Rooms and Hmentioning

confidence: 99%

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

Tunzi

Østergaard

Svendsen

et al. 2016

Energy

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Document Version Peer reviewed version Link back to DTU Orbit Citation (APA):Tunzi, M., Østergaard, D. S., Svendsen, S., Boukhanouf, R., & Cooper, E. (2016). Method to investigate and plan the application of low temperature district heating to existing hydraulic radiator systems in existing buildings. Energy, 113,[413][414][415][416][417][418][419][420][421] This study presents a method to adapt existing hydronic systems in buildings to take advantage of low temperature district heating (LTDH). Plate radiators connected to double string heating circuits were considered in an optimization procedure, based on supply and return temperatures, to obtain the required logarithmic mean temperature difference (LMTD) for a low temperature heating system. The results of the analysis are presented as the average reduction of LMTD over the heating season compared to the base case design conditions. Two scenarios were investigated based on the assumption of a likely cost reduction in the end users' energy bills of 1% for each 1 °C reduction of return and average supply and return temperatures. The results showed possible discounts of 14% and 16% respectively, due to more efficient operation of the radiators. These were achieved without any intervention in the thermal envelope or to the heating systems, through simply adjusting the temperatures according to demand and properly controlling the plate radiators with thermostatic radiator valves (TRVs).

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Temperature optimization in district heating systems

Cited by 26 publications

References 6 publications

Survey of radiator temperatures in buildings supplied by district heating

Survey of radiator temperatures in buildings supplied by district heating

Heat Supply Comparison in a Single-Family House with Radiator and Floor Heating Systems

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

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