scholarly journals Some Problems of the Integration of Heat Pump Technology into a System of Combined Heat and Electricity Production

10.14311/212 ◽  
2001 ◽  
Vol 41 (2) ◽  
Author(s):  
G. Böszörményi ◽  
L. Böszörményi
Keyword(s):  
Heat Pump ◽  
District Heating ◽  
Heating System ◽  
Energy Utilization ◽  
Electricity Production ◽  
Geothermal Heat ◽  
District Heating System ◽  
Thermal Output ◽  
Short Period

The closure of a part of the municipal combined heat and power (CHP) plant of Košice city would result in the loss of 200 MW thermal output within a realtively short period of time. The long term development plan for the Košice district heating system concentrates on solving this problem. Taking into account the extremely high (90 %) dependence of Slovakia on imported energy sources and the desirability of reducing the emission of pollutantst the alternative of supplying of 100 MW thermal output from geothermal sources is attractive. However the indices of economic efficiency for this alternative are unsatisfactory. Cogeneration of electricity and heat in a CHP plant, the most efficient way of supplying heat to Košice at the present time. If as planned, geothermal heat is fed directly into the district heating network the efficiency would be greatly reduced. An excellent solution of this problem would be a new conception, preferring the utilization of geothermal heat in support of a combined electricity and heat production process. The efficiency of geothermal energy utilization could be increased through a special heat pump. This paper deals with several aspects of the design of a heat pump to be integrated into the system of the CHP plant.

scholarly journals Long-term Green Innovation Opportunities Within the Hungarian District Heating Sector Towards 2030

2016 ◽  
Vol 4 (1) ◽  
pp. 12-24
Author(s):  
Balint Horvath ◽  
Maria Borocz ◽  
Sandor Zsarnoczai ◽  
Csaba Fogarassy
Keyword(s):  
Natural Gas ◽  
District Heating ◽  
Heating System ◽  
Simple Fact ◽  
District Heating System ◽  
Primary Input ◽  
Cooling Systems ◽  
The Public ◽  
Heating And Cooling

Abstract Natural gas is still the primary input of the Hungarian heating and cooling systems, therefore it still makes most of the overheads. One of the main obstacles of a competitive district heating system is the public opinion which still considers this service more expensive than the traditional heating forms. According to the absolute numbers this assumption might be valid but from a more accurate economic perspective, heat production has more aspects to stress. Most people forget about the simple fact that the maintenance costs of natural gas based systems are rather outsourced to the consumer than in the case of district heating. Furthermore, the uneven rate of the fixed and variable costs of this technology does not prove to be optimal for service developments. Investigating the future tendencies highlight that encouraging the efficiency improvement of district heating and the spread of technological innovation in the sector does not belong to the top priorities. Still, avoiding this problem it could lead serious deadweight losses in the case of the heating sector.

scholarly journals Active Management of Heat Customers Towards Lower District Heating Return Water Temperature

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1863
Author(s):  
Tommy Rosén ◽  
Louise Ödlund
Keyword(s):  
Energy Efficiency ◽  
Water Temperature ◽  
District Heating ◽  
Heating System ◽  
Active Management ◽  
Electricity Production ◽  
Low Grade ◽  
Efficiency Gains ◽  
District Heating System ◽  
Return Water

The traditional way of managing the supply and return water temperatures in a district heating system (DHS) is by controlling the supply water temperature. The return water temperature then becomes a passive result that reflects the overall energy efficiency of the DHS. A DHS with many poorly functioning district heating centrals will create a high return water temperature, and the energy efficiency of the DHS will be affected negatively in several ways (e.g., lower efficiency of the flue gas condenser, higher heat losses in pipes, and lower electricity production for a DHS with combined heat and power (CHP)). With a strategic introduction of low-grade heat customers, the return water temperature can be lowered and, to some extent, controlled. With the heat customers connected in parallel, which is the traditional setup, return water temperatures can only be lowered at the same rate as the heat customers are improved. The active management of some customers can lower the return water temperatures faster and, in the long run, lead to better controlled return water temperatures. Active management is defined here as an adjustment of a domestic heating system in order to improve DHS efficiency without affecting the heating service for the individual building. The opposite can be described as passive management, where heat customers are connected to the DHS in a standardized manner, without taking the overall DHS efficiency into consideration. The case study in this article shows possible efficiency gains for the examined DHS at around 7%. Looking at fuel use, there is a large reduction for oil, with 10–30% reduction depending on the case in question, while the reduction is shown to be largest for the case with the lowest return water temperature. The results also show that efficiency gains will increase electricity production by about 1–3%, and that greenhouse gas (GHG) emissions are reduced by 4–20%.

On the influence of decommissioning an area thermal substation in a district heating system on heat consumption and costs in buildings – Long term field research

2022 ◽  
Vol 50 ◽  
pp. 101870
Author(s):  
Alicja Siuta-Olcha ◽  
Tomasz Cholewa ◽  
Mirosław Gomółka ◽  
Piotr Kołodziej ◽  
Dorte Skaarup Østergaard ◽  
...  
Keyword(s):  
District Heating ◽  
Field Research ◽  
Heating System ◽  
Heat Consumption ◽  
District Heating System ◽  
Term Field
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