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LAPSE:2023.1873v1

Thermodynamic and Economic Analysis of a High Temperature Cascade Heat Pump System for Steam Generation

Zhenneng Lu, Yuan Yao, Guangping Liu, Weibin Ma, Yulie Gong

February 21, 2023

Abstract
A high temperature cascade heat pump (HTCHP) system using low-grade heat from waste water to generate steam for industrial processes is studied from the thermodynamic and economic view. The effects of intermediate temperature, heat source temperature, heat sink temperature, working fluids, and the pinch point temperature difference at the evaporator, condenser, and intermediate heat exchanger on the thermodynamic performance and cost-effectiveness of the HTCHP system are investigated. The PBP varying with the gas price and electricity price is evaluated as well. The results show that optimal intermediate temperatures exist under different operational conditions, not only for the COP, but also for the PBP. A high heat source temperature and low heat sink temperature are conducive to increasing the COP and shortening the PBP. Working fluid pair R1234Ze(E)-R1233zd(Z) shows a promising application in the HTCHP system for its relatively high COP, short PBP, and low GWP. A lower pinch point temperature difference will cause a higher COP and shorter PBP, but a higher SEC. The energy price has a great effect on the economic viability of the system. When the price ratio is lower than 1.81, the PBP is lower than 4.6 years.

Record ID

LAPSE:2023.1873v1

Keywords

cascade cycle, economic analysis, high temperature heat pump, industrial waste heat, steam generation

Subject

Energy Systems

Suggested Citation

Lu Z, Yao Y, Liu G, Ma W, Gong Y. Thermodynamic and Economic Analysis of a High Temperature Cascade Heat Pump System for Steam Generation. (2023). LAPSE:2023.1873v1

Author Affiliations

Lu Z: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China; Gua
Yao Y: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of New and Renewable Energy Resea
Liu G: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China; Guangdong Provincial Key Laboratory of New and Renewable Energy Resea
Ma W: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China; Gua
Gong Y: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou 510640, China; Gua

Journal Name

Processes

Volume

Issue

First Page

1862

Year

2022

Publication Date

2022-09-15

DOI:

https://doi.org/10.3390/pr10091862