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Theoretical and Experimental Cycle Performance of Natural Working Fluids for Moderate/High Temperature Heat Pump

Author: ChenChen
Tutor: WangHuaiXin
School: Tianjin University
Course: Engineering Thermophysics
Keywords: High Temperature Heat Pump Natural refrigerants Cycling performance Plate heat exchanger
CLC: TK115
Type: Master's thesis
Year: 2010
Downloads: 85
Quote: 0
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Abstract


High temperature heat pump technology development, industrial waste heat as a heat source for to expand heat pump energy-saving technology application space, industrial waste heat recycling means important domestic basic research and development of high temperature heat pump system in its infancy. There is no dedicated parts and recognized as the working fluid in the high-temperature heat pump system, the focus of the study of high temperature heat pump technology based on the room temperature heat pump system hardware, looking both excellent environmental performance and cycle performance in high temperature heat pump working fluid application. Synthetic working fluids vast majority of spread to the atmosphere and pose potential risks to the Earth's ecological environment, natural refrigerants is called the final plan to solve the environmental problems. This article is based on the of R134a room temperature heat pump system hardware, focusing on natural refrigerants match screening principles to work and quality of the system hardware, cycling performance improved theoretical analysis and calculation method, the condensing temperature range of 60-105 ℃, 30, 35,40,45 ℃ the cyclic temperature rise under the ODP 0 GWP low environment-friendly natural working fluid the theoretical cycle performance comparative study, screening out environmental performance and cycle performance and exemplary natural refrigerants R600a and R600. Adoption of improved contrast Experimental evaluation methods, the condensing temperature range of 60-95 ℃, the two natural refrigerant R600a, R600 cycle performance of experimental research. Results: with the research group pre-preferred working fluid R245fa compared natural refrigerant R600a and R600 have better cycle performance the two natural working fluid COP and heating capacity than R245fa, comprehensive performance is better than R245fa. Condensing temperature range investigated, R600 exhaust temperature and consumption power of the compressor is lower than R600a, the COP of higher than the R600a and cycle performance than R600a; especially in a high temperature of above 80 ° C the condensation temperature conditions, R600 The performance advantage is more obvious. R600a and R600 is flammable, use security measures to be taken. Add a small amount of R600a and R600 refrigerant mixtures using non-flammable synthetic working fluids, can meet the security requirements of the excellent work quality. This article in accordance with the above method mixed working fluids M2, for experimental research, and the refrigerant mixtures M2 COP and heating capacity are higher than R245fa, combined cycle performance superior to R245fa cycle performance improved safety performance. guaranteed. Heat transfer equipment is an important part of the heat pump system to match the heat exchanger is also the main content of the high-temperature heat pump design. With the rapid development in recent years in the plate heat exchangers, plate heat exchanger selection optimization problem more and more attention. The plate heat exchangers are discussed, using the selection of distribution at steady state parameters split-phase numerical simulation model, combined with the energy conservation equation and momentum conservation equations of plate heat exchanger and through the refrigerants R22 and The natural refrigerants Selection computing reliability verification.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Heat > Waste heat utilization
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