Thermodynamic, Economic, and Environmental Comparison Between the Direct and Indirect CO2 Refrigeration Cycle With Conventional Indirect NH3 Cycle With Considering a Heat Recovery System in an Ice Rink: A Case Study

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Hossien Momeni ◽  
Mohammad Mehdi Keshtkar
Keyword(s):  
Heat Recovery ◽  
Second Law Of Thermodynamics ◽  
Recovery Process ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Recovery System ◽  
Heat Recovery System ◽  
Industrial Refrigeration ◽  
Selection Of

In industrial refrigeration systems, such as ice rinks, because of consumption of a lot of energy, the selection of a refrigeration system is very important. At this work, environmental considerations are combined with thermodynamics and economics for the comparison of three different refrigeration systems in an ice rink, including the NH3/brine, CO2/brine, and full CO2. The first law of thermodynamics is used to calculate the system's coefficient of performance (COP) and the second law of thermodynamics is applied to quantify the exergy destructions in each component of a refrigeration system. With regard to the above, the exergy efficiency and energy consumption of the systems are determined by taking into account the heat recovery process that has been performed in the above-mentioned cycles. The results indicate that if a heat recovery system has been used in the refrigeration system, coefficient of performance of full CO2 refrigeration system is 33% higher than the CO2/brine and 66% greater than the NH3/brine system. The results also show that, whatever the refrigeration evaporating temperature in the NH3/brine system reaches lower than −12.4 °C, the total cost of this system will be greater than the full CO2 system.

Hybrid Heat Recovery System Applied To Exhaust Gases – Thermal Modeling And Case Study

2019 ◽  
Vol 42 (2) ◽  
pp. 106-119
Author(s):  
Hassan Jaber ◽  
Thierry Lemenand ◽  
Mohamad Ramadan ◽  
Mahmoud Khaled
Keyword(s):  
Heat Recovery ◽  
Thermal Modeling ◽  
Exhaust Gases ◽  
Recovery System ◽  
Heat Recovery System

scholarly journals CFD analysis of a dual heat recovery system

2019 ◽  
Vol 85 ◽  
pp. 02007
Author(s):  
Robert Ştefan Vizitiu ◽  
Gavril Sosoi ◽  
Andrei Burlacu ◽  
Florin Emilian Ţurcanu
Keyword(s):  
Heat Exchanger ◽  
Thermal Energy ◽  
Heat Recovery ◽  
Hot Water ◽  
Heat Transfer Analysis ◽  
Cfd Analysis ◽  
Pipe System ◽  
Recovery System ◽  
Heat Recovery System

This paper presents a CFD Heat Transfer Analysis of an originally designed system for heat recovery in the building sector. The heat exchanger has a dual role, which means it will produce simultaneously hot water and warm air. The key to the efficiency of the heat exchanger is the heat pipe system which recovers thermal energy from residual hot water and transfers it to the secondary agents. The paper includes a case study structured by different mesh distributions and flow regimes. The purpose of the heat exchanger is to reduce the costs of producing thermal energy and to increase the overall energy efficiency of buildings.

scholarly journals SINTER PLANT WASTE HEAT RECOVERY PROCESS AND ITS BENEFIT IN INDIAN STEEL INDUSTRY

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Priyabrata sahoo ◽  
Prof. Om Prakash Satyam
Keyword(s):  
Steel Industry ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Sinter Plant ◽  
Waste Heat ◽  
Recovery Process ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Heat Recovery System ◽  
The Cost

Sinter waste heat recovery system is a process onwards gainfully utilization of untapped waste heat from sinter plant for generating steam either for process steam requirement or in turn can produce power for plant. The saving in power will reduce the cost of production of sinter and in turn, the cost of steel. Sinter waste heat recovery is a very promising option for the future adoption in Indian steel industry. The current statuses of this technology in various countries are also under adoption. Finally, the potential of implementation in Indian steel has been discussed and its challenges as well as opportunities involved.

scholarly journals Water-Cooled Chiller Terintegrasi Heat Recovery System pada Industri Perhotelan di Bali

2020 ◽  
Vol 13 (2) ◽  
pp. 59
Author(s):  
Made Sucipta ◽  
Ida Bagus Oka Jeve ◽  
Ketut Astawa
Keyword(s):  
Heat Recovery ◽  
Energy Use ◽  
Performance Testing ◽  
Integrated System ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Recovery System ◽  
Heat Recovery System ◽  
System Data ◽  
Compressor Power

Performance testing of water-cooled chiller integrated with a heat recovery system has been carried out at a hotel in Bali. After commissioning, testing is carried out for 2 days to determine the readiness of the components in operation. The coefficient of performance which is the reference in this study is used to determine the performance of the system with a capacity of 275 tons of refrigeration which is divided into the coefficient of performance of the refrigeration system and the coefficient of performance of the total integrated system. Data was collected with 8 hour intervals starting at 06.00, 14.00, and 22.00 Wita every day. This condition is based on the prediction of the cycle of changes in energy use in the hotel, which includes breakfast, hotel check-in and bedtime. From the research results, it was found that with the condition and situation of the hotel were not measured properly and the occupancy rate of the hotel which was not yet maximal resulted in a greater refrigeration capacity on the second day, but this was also followed by a large demand for compressor power. Although in the end the coefficient of performance was slightly larger than day 1. It was also found that the greatest need for heat transfer rate is required at 22.00 Wita during the 2-day test. This is possibly due to the need for hot water for hotel guests to shower at night. In general, an increase in the coefficient of performance is still possible if there is an increase in hotel occupancy rates.

Multi drain heat recovery system – Thermal modeling, parametric analysis, and case study

2020 ◽  
Vol 228 ◽  
pp. 110447
Author(s):  
Rabih Murr ◽  
Mahmoud Khaled ◽  
Jalal Faraj ◽  
Elias Harika ◽  
Bakri Abdulhay
Keyword(s):  
Parametric Analysis ◽  
Heat Recovery ◽  
Thermal Modeling ◽  
Recovery System ◽  
Heat Recovery System
Sign in / Sign up

Export Citation Format

Share Document