Experimental and numerical investigation of driving potential of biomass-pellet hot air generator for coupling with absorption heat pump

IF 1.1 4区工程技术 Q4 THERMODYNAMICS Thermal Science Pub Date : 2023-01-01 DOI:10.2298/tsci221103068i

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Abstract

This paper presents a numerical and experimental study of a heating system that consists of Hot Air Generator driven by biomass pellet burner to drive the NH3-H2O absorption heat pump made by Robur. The aim of this work is to fully test the system of Hot Air Generator for thermal potential, by developing a thermal field, while driving the absorption heat pump of medium capacities for residential purposes, and to make model of predicting the efficiencies of heating comparing to conveyed heat in desorber of absorption heat pump. Numerical simulations of the Hot Air Generator were performed in the commercial software Ansys Fluent and CFX. The experimental part was carried out in the laboratory of the Faculty of Mechanical Engineering in Nis, where the temperature and velocity measurements were obtained and compared to numerical results. Results were obtained for mass airflow through the Hot Air Generator and desorber of 0.17 and 0.2552 kg/s, pellet burner power of 15, 18, 21, 24, 27 and 30 kW, with air inlet temperature in desorber of around 89 to 140 ?C. and . The heating efficiency of the absorption heat pump goes from 1.01 to 1.37. The heat loss over the surfaces of Hot Air Generator goes from 0.6 to 0.9 kW depending on ambient air and surface temperatures. The system has the potential to be applied in low-temperature heating and the spare heat from combustion products and residual hot air can be used for different purposes.

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生物质颗粒热风发生器与吸收式热泵耦合驱动潜力的实验与数值研究

本文对由生物质颗粒燃烧器驱动热风发生器驱动Robur公司NH3-H2O吸收式热泵的供热系统进行了数值和实验研究。本文的目的是在驱动中等容量住宅吸收式热泵的同时，通过建立热场，对热风发生器系统的热势进行全面测试，并与吸收式热泵解吸器的传热效率进行比较，建立预测模型。在商业软件Ansys Fluent和CFX中对热风发生器进行了数值模拟。实验部分在尼斯机械工程学院实验室进行，在那里获得了温度和速度测量值，并与数值结果进行了比较。结果表明:热风发生器和解吸器的大流量分别为0.17和0.2552 kg/s，颗粒燃烧器功率分别为15、18、21、24、27和30 kW，解吸器入口温度为89 ~ 140℃。和。吸收式热泵的热效率为1.01 ~ 1.37。根据环境空气和表面温度的不同，热风发生器表面的热损失在0.6到0.9 kW之间。该系统具有应用于低温供暖的潜力，燃烧产物的余热和余热空气可用于不同的目的。

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来源期刊

Thermal Science 工程技术-热力学

CiteScore

2.70

自引率

29.40%

发文量

399

审稿时长

5 months

期刊介绍： The main aims of Thermal Science to publish papers giving results of the fundamental and applied research in different, but closely connected fields: fluid mechanics (mainly turbulent flows), heat transfer, mass transfer, combustion and chemical processes in single, and specifically in multi-phase and multi-component flows in high-temperature chemically reacting flows processes present in thermal engineering, energy generating or consuming equipment, process and chemical engineering equipment and devices, ecological engineering, The important characteristic of the journal is the orientation to the fundamental results of the investigations of different physical and chemical processes, always jointly present in real conditions, and their mutual influence. To publish papers written by experts from different fields: mechanical engineering, chemical engineering, fluid dynamics, thermodynamics and related fields. To inform international scientific community about the recent, and most prominent fundamental results achieved in the South-East European region, and particularly in Serbia, and - vice versa - to inform the scientific community from South-East European Region about recent fundamental and applied scientific achievements in developed countries, serving as a basis for technology development. To achieve international standards of the published papers, by the engagement of experts from different countries in the International Advisory board.