Experimental analysis of a novel concept of a “thermally driven” solution pump operating a small-capacity ammonia/water absorption heat pumping system |
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| Affiliation: | 1. Thermodynamics and Energy Technology, Universität Paderborn, Warburger Str. 100, 33098 Paderborn, Germany;2. PCM-innovativ GmbH, Am Fichtenberg 2, 14552 Michendorf, Germany;3. Miele & Cie. KG, Carl-Miele-Str. 29, 33332 Gütersloh, Germany;1. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei, Anhui, China;2. University of Management and Technology, Lahore, Pakistan;3. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, MOE, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China |
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| Abstract: | Only a few electrical solution-pumps are available on the market suitable for ammonia/water absorption heat pumping systems with an evaporator capacity lower than 20 kW. In order to improve this, a “thermally-driven” solution-pump is proposed, offering several advantages, as e.g. an oil-free, simple and leak-proof design. “Thermally-driven” means this pump is driven by a power process within the absorption heat pumping-cycle instead of electricity. The experimental analysis of this novel pump operating in a commercially available ammonia/water-absorption chiller shows that it can be easily integrated and works without any relevant operating limits. However, the measured COP of the considered chiller is decreased by at least 0.1 (15%) by this thermal-pump compared to the existing electrical-pump. Nevertheless, thermal energy (e.g. cost and CO2-free waste heat) can be used to drive this pump and due to lower production cost it can be an interesting alternative from an economical and ecological point of view. |
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