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1. Annual performance experiments of an earth-air heat exchanger fresh air-handling unit in severe cold regions: Operation, economic and greenhouse gas emission analyses

Author:
Li, Hui; Ni, Long; Yao, Yang; Sun, Cheng
Source:
Renewable energy 2020 v.146 pp. 25-37
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; air; air temperature; cooling; energy use and consumption; greenhouse gas emissions; heat pumps; heat recovery; land use; mass transfer; pipes; primary energy; renewable energy sources; water content;     Show all 14 Subjects
Abstract:
... This paper proposes a fresh air-handling unit, comprising an earth-air heat exchanger (EAHE) and a heat recovery unit, to solve the problem of insufficient fresh air and save primary energy use in severe cold regions. A new construction of double-layer buried pipes was adopted to enhance heat transfer and save land use. Annual performance of system from January to December 2017 was evaluated by an ...
DOI:
10.1016/j.renene.2019.06.058

2. Experimental study on the thermal performance of a grey water heat harnessing exchanger using Phase Change Materials

Author:
Mazhar, Abdur Rehman; Liu, Shuli; Shukla, Ashish
Source:
Renewable energy 2020 v.146 pp. 1805-1817
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; copper; corrosion; greywater; heat; latent heat; mass flow; melting point; phase transition; pipes; renewable energy sources; temperature; thermal conductivity; water;     Show all 14 Subjects
Abstract:
... To integrate heat extraction and storage into a single unit along with decoupling of demand and supply, Phase Change Materials (PCMs) can be used to harness heat from grey water (GW). A simple heat exchanger linking both the GW and incoming mains cold water (CW) in a counter flow arrangement with a PCM is experimentally tested. To enhance the thermal conductivity of the PCM, metallic copper fins a ...
DOI:
10.1016/j.renene.2019.08.053

3. Improving the thermal performance of ground air heat exchanger system using sand-bentonite (in dry and wet condition) as backfilling material

Author:
Agrawal, Kamal Kumar; Misra, Rohit; Agrawal, Ghanshyam Das
Source:
Renewable energy 2020 v.146 pp. 2008-2023
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; air; air flow; backfilling; cooling; heat transfer; renewable energy sources; soil thermal properties;     Show all 8 Subjects
Abstract:
... Thermal performance of ground-air heat exchanger (GAHE) depends on the rate of heat transfer between air and soil, which is governed by thermal properties of soil surrounding the GAHE pipe. Soil thermal properties around GAHE pipe can be improved either by increasing its moisture contents or by using some thermally enhanced backfilling materials. In the present study experimentally investigates th ...
DOI:
10.1016/j.renene.2019.08.044

4. Novel solar PV/Thermal collector design for the enhancement of thermal and electrical performances

Author:
Rejeb, Oussama; Gaillard, Leon; Giroux-Julien, Stéphanie; Ghenai, Chaouki; Jemni, Abdelmajid; Bettayeb, Maamar; Menezo, Christophe
Source:
Renewable energy 2020 v.146 pp. 610-627
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; coatings; cooling; electric power; heat tolerance; models; renewable energy sources; solar cells; solar collectors; surface area; temperature;     Show all 11 Subjects
Abstract:
... The main objective of this study is to develop a novel photovoltaic thermal collector (PVT) to improve the electrical and thermal efficiencies of the solar collector. The goal is to maximize the electrical power and minimize the thermal losses of the solar panel. A novel photovoltaic thermal collector is designed and tested. The new PVT collector includes: (1) An optical anti-reflective and low-em ...
DOI:
10.1016/j.renene.2019.06.158

5. Outlet temperatures of a slinky-type Horizontal Ground Heat Exchanger with the atmosphere-soil interaction

Author:
Tang, Fujiao; Nowamooz, Hossein
Source:
Renewable energy 2020 v.146 pp. 705-718
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; heat transfer; renewable energy sources; soil; surface temperature;     Show all 5 Subjects
Abstract:
... Generally, a Horizontal Ground Heat Exchanger (HGHE) is installed in shallow depths, which can influence the land surface temperature during its operation period, especially when a high heat demand is required. Consequently, the existing methods of using time-varying land surface temperatures are not sufficient for the HGHE simulations. In this paper, a numerical framework considering the atmosphe ...
DOI:
10.1016/j.renene.2019.07.029

6. Solid Oxide Fuel Cell systems for electricity generation: An optimization prospect

Author:
Prodromidis, George N.; Coutelieris, Frank A.
Source:
Renewable energy 2020 v.146 pp. 38-43
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; chemical reactions; electricity generation; ethanol; exergy; fuel cells; fuels; methane; power plants; renewable energy sources; simulation models; system optimization; temperature;     Show all 13 Subjects
Abstract:
... The present study concerns with an optimization method of Solid Oxide Fuel Cell (SOFC) systems for electricity generation, directly fed by CH4 (methane) or C2H5OH (ethanol). By considering a detailed thermodynamic analysis, an innovative simulation model, namely THERMAS (THERmodynamic MAthematical Simulation), was designed and implemented. A specific SOFC-based system was selected to be the refere ...
DOI:
10.1016/j.renene.2019.06.049

7. To study the effect of different parameters on the thermal performance of ground-air heat exchanger system: In situ measurement

Author:
Agrawal, Kamal Kumar; Misra, Rohit; Agrawal, Ghanshyam Das
Source:
Renewable energy 2020 v.146 pp. 2070-2083
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; air flow; air temperature; cooling; renewable energy sources; soil water content; water content;     Show all 7 Subjects
Abstract:
... In the present experimental work, two identical real field experimental setups (with dry soil and wet soil) of ground-air heat exchanger (GAHE) have been developed in order to evaluate the influence of change in inlet air temperature, airflow velocity, diameter of pipe and soil moisture content on the thermal performance of GAHE system. Influence of these parameters on the required pipe length to ...
DOI:
10.1016/j.renene.2019.08.065

8. A novel electrical charging condensing heat exchanger for efficient particle emission reduction in small wood boilers

Author:
Grigonytė-Lopez Rodriguez, Julija; Suhonen, Heikki; Laitinen, Ari; Tissari, Jarkko; Kortelainen, Miika; Tiitta, Petri; Lähde, Anna; Keskinen, Jorma; Jokiniemi, Jorma; Sippula, Olli
Source:
Renewable energy 2020 v.145 pp. 521-529
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; air; biomass; boilers; cleaning; combustion; electrophoresis; emissions; environmental impact; flue gas; heat recovery; renewable energy sources; wood;     Show all 13 Subjects
Abstract:
... Small-scale biomass combustion is an important source of fine particles in ambient air, causing adverse health and environmental effects. Thus, there is a clear need to develop efficient and feasible flue gas cleaning technologies for small-scale combustion appliances. In this study a novel electrical charging condensing heat exchanger (eCHX) for combined fine particle removal and efficient heat r ...
DOI:
10.1016/j.renene.2019.06.052

9. Dynamic model of solar heating plant with seasonal thermal energy storage

Author:
Kubiński, Kamil; Szabłowski, Łukasz
Source:
Renewable energy 2020 v.145 pp. 2025-2033
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; European Union; aquifers; boilers; computer software; dynamic models; harvesting; heat; primary energy; solar collectors; solar energy; solar radiation; thermal energy;     Show all 13 Subjects
Abstract:
... The article focuses on existing technologies developed to harvest and store solar irradiance as a source of primary energy in district heating systems. In the study particular attention was given to solar collector systems cooperating with seasonal heat storage solutions. Motivating this work was the search for a tool to assess achievable solar fraction ‒ the ratio of usable solar energy to total ...
DOI:
10.1016/j.renene.2019.07.120

10. Effect of inner pipe type on the heat transfer performance of deep-buried coaxial double-pipe heat exchangers

Author:
Li, Chao; Guan, Yanling; Yang, Ruitao; Lu, Xiong; Xiong, Wenxue; Long, Anjie
Source:
Renewable energy 2020 v.145 pp. 1049-1060
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; heat transfer; mathematical models; pipes; renewable energy sources; temperature; water flow;     Show all 7 Subjects
Abstract:
... In the present study, based on the currently used deep-buried coaxial double-pipe heat exchange systems for closed loop heat extraction, the influence of several inner pipe types on the heat transfer performance of buried pipe systems is analyzed. The deep-buried coaxial double-pipe with a smooth inner pipe used in current practice was taken as an example, and a full-scale three-dimensional (3D) n ...
DOI:
10.1016/j.renene.2019.06.101

11. Experimental and numerical study of a PCM solar air heat exchanger and its ventilation preheating effectiveness

Author:
Hu, Yue; Heiselberg, Per Kvols; Johra, Hicham; Guo, Rui
Source:
Renewable energy 2020 v.145 pp. 106-115
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; air; air quality; climate; cooling; energy; heat transfer; laminar flow; latent heat; mathematical models; solar energy; summer; winter;     Show all 13 Subjects
Abstract:
... This article presents a PCM solar air heat exchanger integrated into ventilated window developed to maximize the use of the solar energy to pre-heat the ventilated air. The system is designed to improve the indoor air quality and thermal comfort by continuous pre-heated air supply at a reduced energy use through the capturing and storing of solar energy. This study examines the thermodynamic behav ...
DOI:
10.1016/j.renene.2019.05.115

12. Heat transfer simulation, analysis and performance study of single U-tube borehole heat exchanger

Author:
Kerme, Esa Dube; Fung, Alan S.
Source:
Renewable energy 2020 v.145 pp. 1430-1448
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; cooling systems; energy balance; equations; heat pumps; heat tolerance; heat transfer; models; renewable energy sources; temperature; thermal conductivity;     Show all 11 Subjects
Abstract:
... This paper presents the analysis, simulation and performance study of heat transfer in a single U-tube borehole heat exchanger (BHE). Unsteady heat transfer method was used to analyze the heat transfer process of both inside and outside the borehole. Implicit numerical method applied on heat transfer equations obtained from energy balance (accompanied with thermal resistance model) was used to obt ...
DOI:
10.1016/j.renene.2019.06.004

13. Long-term high frequency monitoring of a large borehole heat exchanger array

Author:
Naicker, Selvaraj S.; Rees, Simon J.
Source:
Renewable energy 2020 v.145 pp. 1528-1542
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; cooling; data collection; exercise; geothermal energy; heat transfer; model validation; models; monitoring; temperature; thermal properties;     Show all 11 Subjects
Abstract:
... Borehole heat exchangers are a key technological element of geothermal energy systems and modelling their behaviour has received much attention. The aim in the work reported here has been to produce a reference data set that can be used in analysis of large borehole heat exchanger systems and validation of models of such. A monitoring exercise to collect high frequency data from a large ground hea ...
DOI:
10.1016/j.renene.2019.07.008

14. Numerical analysis of phase-change material melting in triplex tube heat exchanger

Author:
Yang, Kun; Zhu, Neng; Chang, Chen; Yu, Haoran; Yang, Shan
Source:
Renewable energy 2020 v.145 pp. 867-877
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; algorithms; barium; computer software; equations; exergy; heat transfer; latent heat; mass flow; mathematical models; melting; renewable energy sources; temperature; thermal energy;     Show all 14 Subjects
Abstract:
... Latent heat thermal energy storage (LHTES) systems have gained significant attention recently owing to their high energy-storage-density per unit volume and nearly isothermal behavior during the phase-change process. This study numerically investigates the melting performance of a phase-change material (PCM: Ba(OH)2·8H2O) in a triplex tube heat exchanger (TTHX). First, the physical and mathematica ...
DOI:
10.1016/j.renene.2019.06.092

15. Superposition of the single point source solution to generate temperature response factors for geothermal piles

Author:
Fossa, M.; Priarone, A.; Silenzi, F.
Source:
Renewable energy 2020 v.145 pp. 805-813
ISSN:
0960-1481
Subject:
heat exchangers,   etc   ; analytical methods; buildings; drilling; enthalpy; heat; heat pumps; models; pipes; renewable energy sources; temperature;     Show all 11 Subjects
Abstract:
... Geothermal piles are a very promising technique to exploit the low enthalpy resource for ground coupled heat pumps. In fact, they are heat exchangers integrated in the foundation structures of the buildings, with reduced need in term of ground surface availability and diminished drilling costs. Unfortunately, to evaluate the ground thermal response to their presence it is not possible to use class ...
DOI:
10.1016/j.renene.2019.05.011

16. Demand side management in district heating systems by innovative control

Author:
Guelpa, Elisa; Marincioni, Ludovica
Source:
Energy 2019 v.188
ISSN:
0360-5442
Subject:
heat exchangers,   etc   ; cold; heat; models; pipelines; pollutants; temperature;     Show all 7 Subjects
Abstract:
... Demand side management can be successfully applied to district heating systems for shaving thermal peaks. Peak shaving allows increasing share of convenient and less pollutant sources (waste heat, cogeneration and renewables) and enabling further building connections without modifying the pipelines. Demand side management in district heating is mainly done by shifting the load. Another interesting ...
DOI:
10.1016/j.energy.2019.116037

17. Normalized sensitivity analysis of LNG processes - Case studies: Cascade and single mixed refrigerant systems

Author:
Sanavandi, Hamid; Mafi, Mostafa; Ziabasharhagh, Masoud
Source:
Energy 2019 v.188
ISSN:
0360-5442
Subject:
heat exchangers,   etc   ; case studies; compressors; economic analysis; energy; liquefaction; liquefied natural gas; measuring devices; propane; temperature; uncertainty;     Show all 11 Subjects
Abstract:
... The sensitivities of two liquefied natural gas (LNG) cycles, single mixed refrigerant (SMR) and propane pre-cooled mixed refrigerant (C3MR) to input variables are investigated and compared using normalized sensitivity analysis. The normalized sensitivity coefficients indicate the output of the cycles, specific energy consumption (SEC) is more sensitive to the inlet temperature and pressure of the m ...
DOI:
10.1016/j.energy.2019.116068

18. Optimal design and operation of a central domestic hot water heat pump system for a group of dwellings employing low temperature waste heat as a source

Author:
Hervás-Blasco, Estefanía; Navarro-Peris, Emilio; Corberán, José Miguel
Source:
Energy 2019 v.188
ISSN:
0360-5442
Subject:
heat exchangers,   etc   ; carbon dioxide; consumers (people); energy recovery; greenhouse gas emissions; heat; heat pumps; models; temperature;     Show all 9 Subjects
Abstract:
... In this work, a study of an energy recovery system from a low-grade temperature source based on heat pumps for domestic hot water is done. The main components of the system are a pre-heating heat exchanger, an optimized heat pump for domestic hot water production, and a variable-volume storage tank. A model has been developed in TRNSYS to analyse the best configuration and control strategy of the ...
DOI:
10.1016/j.energy.2019.115979

19. Performance evaluation of a modified refrigeration cycle with parallel compression for refrigerator-freezer applications

Author:
Fang, Zhongcheng; Fan, Chaochao; Yan, Gang; Yu, Jianlin
Source:
Energy 2019 v.188
ISSN:
0360-5442
Subject:
heat exchangers,   etc   ; compressors; condensation (phase transition); condensers; energy efficiency; evaporation; evaporators; exergy; freezers; heat transfer; refrigeration; temperature; thermodynamic models;     Show all 13 Subjects
Abstract:
... This paper proposes a modified refrigeration cycle (MRC) with zeotropic mixture R290/R600a for refrigerator-freezer applications. In the MRC, the use of two parallel compressors enables the two evaporators to be operated at two proper evaporation temperatures, which reduces the irreversibility of evaporator heat transfer processes. Noted that a subcooler is installed between the two loops for impr ...
DOI:
10.1016/j.energy.2019.116093

20. A mathematical model for the prediction of the whey protein fouling mass in a pilot scale plate heat exchanger

Author:
Gu, Yingying; Bouvier, Laurent; Tonda, Alberto; Delaplace, Guillaume
Source:
Food control 2019 v.106 pp. 106729
ISSN:
0956-7135
Subject:
heat exchangers,   etc   ; Reynolds number; beta-lactoglobulin; calcium; casein; fouling; guidelines; heat treatment; mathematical models; powders; prediction; surface area; temperature; whey protein concentrate;     Show all 14 Subjects
Abstract:
... A better understanding of protein fouling during the thermal treatment of whey protein concentrate (WPC) solutions is critical for better fouling control. In order to understand the impact of various parameters on the total whey protein fouling mass, a dimensional analysis was applied to the experimental data obtained from a pilot scale plate heat exchanger, setting total fouling mass as the targe ...
DOI:
10.1016/j.foodcont.2019.106729