Improving the operation modes efficiency in heat pump systems of hot water supply with the two-stage heat accumulation
DOI:
https://doi.org/10.15587/1729-4061.2017.92495Keywords:
accumulation of heat, heliosystem, heat pump, combined systems of heat supply, phase transitionAbstract
Here we propose circuit solutions for improving the efficiency of renewable energy sources using the two-step systems of accumulation. At the first step of accumulation, low-potential sources of heat are employed: heat pump, heat recuperation from the condensation contour of refrigeration unit, heliosystem (during winter). At the second step, temperature is brought to the required level through a high-potential source: heliosystem (in summer), gas boiler, solid-fuel gas boiler, etc. We substantiated theoretically and experimentally the rational techniques to connect renewable energy sources to the heat accumulators. A numerical CFD-simulation was performed of the distribution of temperatures in the volume of tank-accumulator under a two-step mode of accumulation; the visualization of temperature field is presented. This made it possible to choose rational modes of heat accumulators operation using the heat carrier connection by a cross circuit and to utilize in full the volume of tank in the combined systems of heat supply. We developed and implemented a pilot production-experimental installation of combined system of heat supply to one of the facilities at ONPU (Ukraine) with the use of heat pump and a reserve source of heat. Experimental study was conducted on experimental-production pilot installation, which confirmed the need for applying the two-step accumulation when using heat pump plants in the combined systems for the preparation of hot water. It was proven experimentally that at temperature of heat carrier in a heat pump plant above 45 °C, its efficiency falls (cost for energy is coming close to energy costs for traditional energy sources).
Research results are relevant because they allow a more efficient use of renewable energy sources in the combined systems of heat supply. It was substantiated that the compactness, ease of installation and low investment, adopted as a priority in the creation of alternative systems of heat supply, often lead to a decrease in their operational efficiency.References
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Copyright (c) 2017 Anton Mazurenko, Alla Denysova, Gennadiy Balasanian, Aleksandr Klimchuk, Krystyna Borysenko
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