4:00pm - 4:20pmID: 1105
/ Session 5b: 1
Full Paper
Topics: Management of heat in buildings and processes, Carbon reduction solutions for high energy using industries, New technologies that avoid the use or global warming refrigerantsKeywords: Heating, District Heating Networks, District Cooling Networks, COP, Evaporators, Energy Efficiency
Viability of an Industrial Heat Pump Considering Different Italian Cities and District Thermal Networks
Adrián Mota-Babiloni1, Giovanna Pallotta2, Ghad Alarnaot Alarnaout1, Elisa Marrasso2, Maurizio Sasso2, Joaquín Navarro-Esbrí1
1Department of Mechanical Engineering and Construction, Universitat Jaume I, Spain; 2Department of Engineering, University of Sannio, 82100 Benevento, Italy
Given the coming prohibition of fossil fuel boilers in different sectors, the study assesses the viability of industrial heat pumps connected to district heating and cooling networks. It compares it with evaporation connection to ambient in six Italian cities, focusing on the potential for energy savings and reduced environmental impact. Italy's diverse climatic conditions significantly influence the performance of heat pumps, which are highly dependent on local temperatures. This paper highlights the advantages and limitations of adopting heat pumps for 75 °C heating production. The findings reveal significant energy-saving potential and alignment with sustainability goals in suitable district heating configurations and favorable climatic conditions. However, limitations emerge in less optimal environments, where alternative strategies may be required to maintain efficiency. This work provides valuable insights into the role of industrial heat pumps in smart city applications, offering guidance for their adoption in Italy and other regions with comparable climates.
4:20pm - 4:40pmID: 1134
/ Session 5b: 2
Full Paper
Topics: Carbon reduction solutions for high energy using industries, Adaptation strategies and plans for existing buildings and processes, Retrofitting solutionsKeywords: Energy saving, Retrofit, Industrial Refrigeration, VSD Compressor
Energy Savings by Replacing a Large Capacity Fixed Speed Compressor with a Lower Capacity VSD Compressor For Low Load Optimisation in Refrigerated Distribution
Nicola Miller, Danny McDougall
Star Refrigeration, United Kingdom
With global warming predicted to reach dangerous levels, action must be taken to increase the operating efficiency of refrigeration plants in both new designs and existing installations. Many existing plants have been designed with higher cooling densities than they actually require and so fixed speed screw compressors run at part load with poor efficiencies.
This paper is a case study of a refrigerated distribution centre that sees one of the installed 2.2MW duty fixed speed screw-compressors running at reduced capacity for long periods of time during lower ambient temperature conditions. To improve plant efficiency during these low-load conditions the 2.2MW compressor was swapped out with a reduced capacity VSD driven compressor.
This paper assess the plants historical energy usage data and uses compressor selection software to predict the energy savings of this retrofit.
4:40pm - 5:00pmID: 1169
/ Session 5b: 3
Full Paper
Topics: New technologies that avoid the use or global warming refrigerants, Transport refrigeration, mobile air condition and rental equipmentKeywords: Thermoelectrics, Energy Efficiency, Heat Pump, Performance Mapping
Performance Mapping of the Thermoelectric Sub-Cooler Devoted to Low-Charge Heat Pump Systems
Tufan Özyıldız1,2, Michal Haida1, Emanuele Sicco4, Michal Bajcer1, Rafal Fingas1, Jakub Bodys1, Jacek Smolka1, Daniel Sanchez2, Patricia Aranguren3
1Silesian University of Technology, Poland; 2University Jaume I, Spain; 3Public University of Navarra, Spain; 4University of Udine, Italy
According to sustainability targets, the refrigeration and heat pump sector is switching to low Global Warming Potential (GWP) working fluids. Due to this change, coefficient of performance (COP) of vapour compression system degrades. Thermoelectric sub-cooling method is one of the state of art idea to introduce vapour compression systems to improve coefficient of performance (COP) of the system. Nevertheless, the finding optimum operation point in dynamic operation is challenging especially at extremely high temperatures. Thus, main aim of this paper to investigate the proposed thermoelectric sub-cooler (TESC) design performance and create mapping to find optimum operation in low-charge propane system. The TESCs integrated downstream of condenser in an 8-kW propane heat pump test rig and experiments carried out for operating conditions where propane temperatures varied from 40°C to 50°C, auxiliary water stream relative temperature to the R290 was from -10°C to 10°C and thermoelectric modules voltage was up to 10.0 V DC.
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