Operation Analysis of Local District Heating Sys tem by Using Low-Temperature Geo-thermal Heat Source for Cooling and Heating of Buildings (str. 403 nr. 11/50/19)
prof. dr hab. inż. Robert Sekret
dr inż. Anna Nitkiewicz
  


DOI: 10.15199/9.2019.11.1

Keywords: heat, cold, district heating, compressor heat pump, absorptive heat pump

Abstract:

The paper presents an analysis of the possibility of cooling buildings by means of a local heating system cooperating with a low-temperature heat source with a temperature of 19oC. The concept of a district heating network supplying the complex of public utility buildings was assumed.

It was assumed for the purpose of the analysis, that the solutions would include a system supplying buildings with both heat and cold (covering the heating and cooling needs of buildings throughout the year). In the article, two variants of heat sources are considered: compressor and absorption heat pump. The baseline variant is a district heating system with a gas-fired boiler. The analysis was performed in three different conditions of supply and return temperatures,     

i.e. 60/50oC, 50/40oC and 40/30oC. For the purpose of energy analysis of the cooling systems, a direct geothermal cooling system has been assumed, where geothermal water is used for direct cooling of the buildings by means of existing district heating network and an active cooling system with a heat pump. The system assumes work in a reverse mode in summer season of compressor and absorptive heat pumps that exist in the district heating network, producing cooling water of 7/12°C. The chilled water supplies the air handling unit located in the building. It has been found, basing on the results obtained, that the highest primary energy consumption by the system in summer and winter occur in the case of systems with a compressor heat pump. The unit primary energy demand index in SPC systems using geothermal water was 0,497 GJEP/GJg+ch while in the absorptive heat pump system it was 0,722 GJEP/GJg+ch, and in the gas boiler system was 1, 164 GJEP/GJg+ch. The lowest emission of pollutants to the atmosphere during the whole year were observed in systems with absorption heat pumps. Also, the emission of nitrogen oxides and sulphur dioxide were two to three times lower in systems with an absorption heat pump than in systems with SPC.

 
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