scholarly journals High-temperature heat pump integration into district heating system

Author(s):  
Ludmila Jakovleva
2020 ◽  
Vol 210 ◽  
pp. 112719 ◽  
Author(s):  
Carlos Mateu-Royo ◽  
Samer Sawalha ◽  
Adrián Mota-Babiloni ◽  
Joaquín Navarro-Esbrí

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3218
Author(s):  
Pedro Durán ◽  
Herena Torio ◽  
Patrik Schönfeldt ◽  
Peter Klement ◽  
Benedikt Hanke ◽  
...  

There are 1454 district heating systems in Germany. Most of them are fossil based and with high temperature levels, which is neither efficient nor sustainable and needs to be changed for reaching the 2050 climate goals. In this paper, we present a case study for transforming a high to low temperature district heating system which is more suitable for renewable energy supply. With the Carnot Toolbox, a dynamic model of a potential district heating system is simulated and then transformed to a low temperature supply. A sensitivity analysis is carried out to see the system performance in case space constrains restrict the transformation. Finally, an economic comparison is performed. Results show that it is technically possible to perform the transformation until a very low temperature system. The use of decentralized renewable sources, decentralized heat storage tanks and the placement of a heat pump on each building are the key points to achieve the transformation. Regarding the sensitivity analysis, the transformation is worth doing until the seasonal storage and solar collector field sizes are reduced to 60% and 80% of their values in the reference case, respectively. The economic analysis shows, however, that it is hard for highly efficient low temperature renewable based heat networks to compete with district heating systems based on a centralized fossile CHP solution. Thus, though the presented transformation is technically possible, there is a strong need to change existing economic schemes and policies for fostering a stronger promotion of renewable energy policies in the heat sector.


2012 ◽  
Vol 550-553 ◽  
pp. 3219-3223
Author(s):  
Xing Wang Zhu ◽  
Chun Xia Hu ◽  
Zhi Min Guo ◽  
Yu Gui Su

In this paper,a high temperature heat-pump dryer and a corresponding semi-enclosed test drying room for using the dryer are built up respectively. While the average dry bulb of the external environment is 25°C and the relative humidity is 55%, the performance of the dryer is obtained when the dryer is running continuously for five hours. The results show that: the electromagnetic valve-capillary institution has an obvious effect on the lower the dryer exhaust temperature. It makes the suction temperature of compressor dropped 10 °C~15 °C, which can reduce the exhaust temperature and prevent compressor’s overheating. When the exhaust temperature keep at 100~110 °C, it can not only guarantee the temperature of wind coming from the dryer is high, but also can make sure the drying system’s long-term stable operation.


2017 ◽  
Vol 127 ◽  
pp. 1461-1468 ◽  
Author(s):  
Yan Zhang ◽  
Yufeng Zhang ◽  
Xiaohui Yu ◽  
Jing Guo ◽  
Na Deng ◽  
...  

2019 ◽  
Vol 33 (2) ◽  
pp. 472-482 ◽  
Author(s):  
S. Maalouf ◽  
A. Isikveren ◽  
P. Dumoulin ◽  
N. Tauveron ◽  
N. Cotereau

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