Technical Potential of Thermal Energy Accumulation in District Heating Networks

Derii V.O., PhD (Engin.), https://orcid.org/0000-0002-5689-4897
Institute of General Energy of the National Academy of Sciences of Ukraine, 172 Antonovycha St., Kyiv, 03680, Ukraine
Language: Ukrainian
Source: The Problems of General Energy, 2015, 1(40):34-38
https://doi.org/10.15407/pge2015.01.034
Section: Study and optimization of the technological objects and systems of the energy sector
UDC: 621.643.053
Received: 26.02.2015
Published: 19.05.2015

Abstract:

The use of electrothermal consumers-controllers (ETCC) in district heating systems is one of the possible variants for the frequency and active power control of the integrated power system of Ukraine. When ETCC discharges a large amount of thermal energy in the network (“night-time valley” period), it will inevitably lead to the need of the thermal energy accumulation. At present the theoretical foundation of the thermal power accumulation of ETCC in heating networks has not been adequately developed that may be an obstacle for its massive introduction into district heating systems.
The purpose of this paper is to determine the technologically feasible potential of thermal energy accumulation in district heating networks.
Prevention of the rise of heat carrier temperature above the maximum permissible level in the supply and return lines is one of the constraints stipulated by the need of ensuring the reliability of centralized heat supply system.
The performed analysis indicates that for ensuring the reliable operation of heat supply system the heat carrier temperature in the supply line during the thermal energy accumulation cannot have the maximum value in the entire range of ambient air temperature, it should decrease proportionally to the increase of air temperature.
Investigations revealed that the technical potential of thermal energy accumulation in district heating networks was below the theoretical potential by 35–50% (depending on the heat carrier temperature in the return line). Technical potential reduction is caused by impossibility of ensuring the simultaneous maintenance of the maximum admissible temperature of heat carrier both in supply and return pipelines during thermal energy accumulation in district heating networks.

Keywords: Heating networks, accumulation, heat load, temperature chart, thermal energy, heat carrier temperature, potential.

References:

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