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Study of energy efficiency of a low-temperature water-to-water heat pump
Past haroratli manba asosidagi “suv-suvli” issiqlik nasosining energiya samaradorligini tadqiq qilish
- Karshi Engineering-Economics Institute, Karshi, Uzbekistan
Highlights
- Source water temperatures tested: 5, 10, 15 and 20 °C (measured 2–20 °C in the evaporator).
- Maximum condenser water temperature after 60 minutes: 35, 41.5, 48.8 and 53.5 °C.
- Coefficient of performance: 2.1–3.5; 3.5 with a 20 °C source.
- Refrigerant R134a; evaporator and condenser tanks of 45 L.
Keywords
- heat pump
- water-to-water heat pump
- coefficient of performance
- R134a
- Karshi
Summary
The authors, of the Karshi Engineering-Economics Institute, tested an experimental vapour-compression heat pump with R134a refrigerant, copper-coil evaporator and condenser in 45 L water tanks, a single-stage compressor and an expansion valve, measuring refrigerant temperatures and pressures, water temperatures and the compressor's electricity use.
With source water in the evaporator at starting temperatures of 5, 10, 15 and 20 °C, the heat pump raised the water in the condenser within 60 minutes to at most 35, 41.5, 48.8 and 53.5 °C. During the tests the source water in the evaporator ranged from 2 to 20 °C.
The coefficient of performance rose with the source temperature, from 2.1 to 3.5, reaching 3.5 with a 20 °C source. The authors conclude that heat pumps are an efficient choice for heating systems in Karshi, since their coefficient of performance exceeds 2 at all the source temperatures tested.
How to cite
G. N. Uzoqov, N. S. Elmurodov and A. A. Raxmanqulov (2024). Study of energy efficiency of a low-temperature water-to-water heat pump. Muqobil energetika (Alternative Energy), 1(12), 62–69. https://ojs.qmii.uz/index.php/ae/article/view/837