Abstract
The printed circuit heat exchanger (PCHE) is a promising waste heat recovery technology to improve energy efficiency. The current investigation presents the experimental results on the thermal performance of a novel PCHE for low-temperature waste heat recovery. The novel PCHE was manufactured using precision machining and diffusion bonding. The thermal performances, such as effectiveness and NTU values at different temperatures, are evaluated, and water is used as a working fluid. The experimental results indicate that the PCHE’s effectiveness is around 0.979 for an inlet flow temperature of 95 °C. The predominant factors affecting the thermal performance of the PCHE are the inlet flow temperature and the flow rate of the working fluid. In addition, a comparison of the experimental results and the literature shows that the effectiveness of the PCHE is better than the others, which have fewer layers of PCHE fins.
Highlights
Waste heat generation is inevitable during energy utilization in an industrial process and grows alongside global industrialization
This study investigated the relationship between the heat transfer and flow rate for the printed circuit heat exchanger (PCHE), with a particular focus on different inlet temperatures, flow rate ratio, and heat exchanger effectiveness
The printed circuit heat exwith an S-shaped meandering design for a flow path was tested at laminar flow
Summary
Waste heat generation is inevitable during energy utilization in an industrial process and grows alongside global industrialization. Industrial waste heat is categorized into three temperature ranges, namely: low-temperature (650 ◦ C, e.g., steel and metal processing industry, etc.) [1]. Low-temperature waste heat from industrial activities was extensively observed; for example, roughly 34% was generated in Europe, 50% in China, and 60%. Is in a supercritical CO2 (S-CO2 ) power cycle, which is promising electricity generation using waste heat recovery. This is due to the high efficiency and compact configuration of the PCHE, which reduces the system footprint area [5]. Sodium bicarbonate hot spring (pH value: 6.2~8.6; temp. 60–99 ◦ C) accounts for 70% of hot springs throughout Taiwan
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