EXPERIMENTAL INVESTIGATION OF DAILY COLD ACCUMULATION BY WATER USE OF UNDERGROUND HORIZONS IN KIEV

• Datum: 2019
• Автори та афіліації: Yu. Morozov — Institute of Renewable Energy of the National Academy of Sciences of Ukraine 02094, Kyiv, st. Hnat Hotkevich, 20A; D. Chalaev — 1Institute of Renewable Energy of the National Academy of Sciences of Ukraine 02094, Kyiv, st. Hnat Hotkevich, 20A, 2Institute of Technical Thermophysics of the National Academy of Sciences of Ukraine 03057, Kyiv, st. Maria Kapnist (Zhelyabova), 2a; V. Olijnichenko — Institute of Renewable Energy of the National Academy of Sciences of Ukraine 02094, Kyiv, st. Hnat Hotkevich, 20A,; V. Velychko — Institute of Renewable Energy of the National Academy of Sciences of Ukraine 02094, Kyiv, st. Hnat Hotkevich, 20A
• Ключові слова: keywords
• Hauptverfasser: Morozov, Yu., Chalaev, D., Olijnichenko, V., Velychko, V.
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Institute of Renewable Energy National Academy of Sciences of Ukraine 2019
• Schlagworte: cold water accumulator; extraction well; absorption well; fancoil; room air conditioning; storage tank; circulation pump.
• Online Zugang: https://ve.org.ua/index.php/journal/article/view/218
• Назва журналу: Vidnovluvana energetika

The results of an experimental study of the effectiveness of the use of a daily cold water battery for the production of serial fan coil in order to provide air conditioning in a separate room are presented. The in-situ experimental unit contains a production well, an absorption well, storage tanks, a flowmeter, a cold water thermometer, an indoor air thermometer, a network pump, a waste water thermometer, a cooling room, and a fan coil. Water with a temperature of 12°C from the production well is fed by a downhole pump to a group of storage tanks, which are a battery of cold. After the water has accumulated in the tanks, a network pump is switched on, which supplies water from the storage tanks to the fan coils. The water that passed through the fan coils and cooled the room enters the absorption well. The purpose of the experiment is to investigate the cold water storage system as a daily accumulation of cold water and its subsequent use to provide comfortable indoor conditions with the help of serial fan coil. The main characteristics of the experiment: the flow rate of water at the outlet of the well is 0.9 kg/s, the flow rate of water entering the fancoil - 0.1 kg/s, the flow rate of air through the fancoil - 340 m3/h, the flowing water temperature to the storage tank - 12°С, the temperature of the water entering the fan coil - 12,5°С, the cooling area of ​​the room - 20 m2, the initial temperature in the room - 28ºС, the number of storage tanks - 7 pcs., the total volume of the storage tanks - 7 m3. As a result of the experiments, the room temperature was reduced to 23°C for 3 hours of fancoil operation. The cooling capacity of the fan coil was found to vary from 3640 watts in the initial period to 1820 watts at the end of the cooling process. The temperatures of the coolant at the outlet of the fan coil were 21.5°C and 17.1°C, respectively. Studies have shown that the water storage system of underground horizons with an initial water temperature of 12°C works effectively in the cooling mode of the room using serial fan coils. Heat storage tanks in the form of storage tanks are also effectively used as buffer tanks for regulating the supply of water to the fan coils. Accumulation of solid sediments is observed in the storage tanks when the water is stored for more than 2 days. The discrepancy between the calculated values ​​of the temperature and the experimental values ​​does not exceed 5-7%. The system needs further upgrading to automatically measure water parameters and room temperature and humidity. Ref. 13, fig. 7.