scholarly journals Enhancement of a R-410A Reclamation Process Using Various Heat-Pump-Assisted Distillation Configurations

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3776
Author(s):  
Nguyen Van Duc Long ◽  
Thi Hiep Han ◽  
Dong Young Lee ◽  
Sun Yong Park ◽  
Byeng Bong Hwang ◽  
...  
Keyword(s):  
Heat Pump ◽  
Cold Water ◽  
Operating Cost ◽  
Carbon Dioxide Emission ◽  
Hydraulic Turbine ◽  
Hot Water ◽  
Operating Pressure ◽  
Pump System ◽  
Heat Pump System ◽  
Advantages And Disadvantages

Distillation for R-410A reclamation from a waste refrigerant is an energy-intensive process. Thus, various heat pump configurations were proposed to enhance the energy efficiency of existing conventional distillation columns for separating R-410A and R-22. One new heat pump configuration combining a vapor compression (VC) heat pump with cold water and hot water cycles was suggested for easy operation and control. Both advantages and disadvantages of each heat pump configuration were also evaluated. The results showed that the mechanical vapor recompression heat pump with top vapor superheating saved up to 29.5%, 100.0%, and 10.5% of the energy required in the condenser duty, reboiler duty, and operating cost, respectively, compared to a classical heat pump system, and 85.2%, 100.0%, and 60.8%, respectively, compared to the existing conventional column. In addition, this work demonstrated that the operating pressure of a VC heat pump could be lower than that of the existing distillation column, allowing for an increase in capacity of up to 20%. In addition, replacing the throttle valve with a hydraulic turbine showed isentropic expansion can decrease the operating cost by up to 20.9% as compared to the new heat pump configuration without a hydraulic turbine. Furthermore, the reduction in carbon dioxide emission was investigated to assess the environmental impact of all proposed sequences.

Research on Composite System of Solar Energy Reclaimed Water Heat Pump and Phase Change Energy Storage

2014 ◽  
Vol 521 ◽  
pp. 56-59
Author(s):  
Hui Xing Li ◽  
Peng Cheng ◽  
Guo Hui Feng ◽  
Ran Zhang
Keyword(s):  
Heat Pump ◽  
Operating Cost ◽  
Reclaimed Water ◽  
Water Source ◽  
Heating System ◽  
Hot Water ◽  
Water Heating ◽  
Pump System ◽  
Heat Pump System ◽  
Important Approach

New energy development and utilization is an important approach to solve the problem of energy shortage,a new type of composite heating system is proposed in this study. It expounds the research ideas, the technical principle and operation plan of the system. Through a comparative analysis of the performance coefficient of composite heating system, reclaimed water source heat pump system and solar hot water heating system, it Comes to the conclusions that the composite heating system can not only reduce the operating cost but also improve the running performance of reclaimed water source heat pump and reduce the heat loss of solar hot water heating system.

Economics Analysis of Sewage Source Heat Pump System

2009 ◽  
Author(s):  
Bing Wei ◽  
Bin Zhang ◽  
Lu Jiang ◽  
Wen Luo
Keyword(s):  
Heat Pump ◽  
Fossil Fuel ◽  
Operating Cost ◽  
Air Conditioner ◽  
Pump System ◽  
Heat Pump System ◽  
Advantages And Disadvantages ◽  
Annual Operating Cost ◽  
The Impact ◽  
Sewage Source

To sewage treatment plants, the sewage is plenteous and costless. If the sewage is utilized for air conditioning purpose, it will achieve more value. The temperature of sewage is basically constant in summer or winter. The treated sewage can be used for absorbing the condensing heat in summer and releasing heat to the building space in winter through the sewage heat exchanger. Especially the heating coefficient of the sewage source heat bump is higher in winter, which is an advantage to heating. In this paper the cooling and heating theory of the sewage source heat bump is briefly introduced, the advantages and disadvantages of sewage source heat bump system is explained. With an example in Beijing, China, compared with the boiler/ductless split air conditioner system, the initial investment and annual operating cost are calculated and the economics of the sewage source heat pump system is analyzed. At last the impact of fossil fuel rate and electric rate on the annual operating costs is analyzed. The calculating results showed that under the present rates of fossil fuel and electricity in China, the initial investment of the sewage source heat pump system is higher, the annual operating cost is lower than that of the boiler/ductless split air conditioner system. All these above will be good references for the actual applications of sewage source heat pump systems.

DETERMINING THE PROFITABILITY OF GREENHOUSE ELECTROTECHNOLOGIES: A MODELING APPROACH

HortScience ◽  
1994 ◽  
Vol 29 (4) ◽  
pp. 249a-249
Author(s):  
Eric A. Lavoie ◽  
Damien de Halleux ◽  
André Gosselin ◽  
Jean-Claude Dufour
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
Water System ◽  
Heat Pumps ◽  
Hot Water ◽  
Pump System ◽  
Heat Pump System ◽  
Artificial Lighting ◽  
Hot Air ◽  
Marketable Fruit

The main objective of this research was to produce a simulated model that permitted the evaluation of operating costs of commercial greenhouse tomato growers with respect to heating methods (hot air, hot water, radiant and heat pumps) and the use of artificial lighting for 1991 and 1992. This research showed that the main factors that negatively influence profitability were energy consumption during cold periods and the price of tomatoes during the summer season. The conventional hot water system consumed less energy than the heat pump system and produced marketable fruit yields similar to those from the heat pump system. The hot water system was generally more profitable in regards to energy consumption and productivity. Moreover, investment costs were less; therefore, this system gives best overall financial savings. As for radiant and hot air systems, their overall financial status falls between that of the hot water system and the heat pump. The radiant system proved to be more energy efficient that the hot air system, but the latter produced a higher marketable fruit yield over the 2-year study.

scholarly journals Technical feasibility study of net-zero energy house for Canada - case study of Team North 2009 US DOE Solar Decathlon competition

2021 ◽  
Author(s):  
Toktam Saeid
Keyword(s):  
Heat Pump ◽  
Hot Water ◽  
Solar Thermal ◽  
Thermal System ◽  
Pv System ◽  
Pump System ◽  
Heat Pump System ◽  
Solar Decathlon ◽  
Variable Capacity ◽  
Solar Thermal System

In October 2009, Team North competed in the US DOE 2009 Solar Decathlon competition. Team North's mission was to design and deliver North House, an energy efficient solar-powered home while training Canada's next generation of leaders in sustainable design. In North House, the PV system on the roof was the primary energy generation, complimented by a custom PV cladding system on the south, east and west facades. A solar assisted heat pump system, including a three-tank heat transfer and storage system, the horizontally mounted evacuated-tube solar thermal collectors on the roof and a variable capacity heat pump met the hot water and space heating demands. A second variable capacity heat pump was utilized for space cooling. The solar thermal system was studied using TRNSYS simulation. For the initial assessments the simulations were run for Baltimore. Then, the analyses were extended to different cities across Canada. In all scenarios the same house was linked to the system. The minimum annual solar fraction of the different cities was 64% and it rose up to 81%. Finally, the data measured during the competition were analyzed and compared with the data resulting from the simulation. According to competition measures, during the 10 days of competition in Washington DC, the PV system generated 271.6kWh of electricity and the solar thermal system produced 91.7kWh while the house consumption was 294.1kWh. As a result, North House was evidently a net-positive house.

Experimental Study of Heating-Cooling Combined Ground Source Heat Pump System with Horizontal Ground Heat Exchanger

2011 ◽  
Vol 374-377 ◽  
pp. 398-404 ◽  
Author(s):  
Ying Ning Hu ◽  
Ban Jun Peng ◽  
Shan Shan Hu ◽  
Jun Lin
Keyword(s):  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Pump ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Ground Heat Exchanger ◽  
Pipe Length ◽  
Pump System ◽  
Heat Pump System ◽  
Heating And Cooling

A hot-water and air-conditioning (HWAC) combined ground sourse heat pump(GSHP) system with horizontal ground heat exchanger self-designed and actualized was presented in this paper. The heat transfer performance for the heat exchanger of two different pipe arrangements, three layers and four layers, respectively, was compared. It showed that the heat exchange quantity per pipe length for the pipe arrangement of three layers and four layers are 18.0 W/m and 15.0 W/m. The coefficient of performance (COP) of unit and system could remain 4.8 and 4.2 as GSHP system for heating water, and the COP of heating and cooling combination are up to 8.5 and 7.5, respectively. The power consumption of hot-water in a whole year is 9.0 kwh/t. The economy and feasibility analysis on vertical and horizontal ground heat exchanger were made, which showed that the investment cost per heat exchange quantity of horizontal ground heat exchanger is 51.4% lower than that of the vertical ground heat exchanger, but the occupied area of the former is 7 times larger than the latter's.

Application of an Exhaust Heat Recovery System for Domestic Hot Water

2008 ◽  
Author(s):  
Lanbin Liu ◽  
Lin Fu ◽  
Yi Jiang
Keyword(s):  
Solar Energy ◽  
Heat Pump ◽  
Heat Recovery ◽  
Tap Water ◽  
Hot Water ◽  
Collection System ◽  
Pump System ◽  
Heat Pump System ◽  
Exhaust Heat ◽  
Exhaust Heat Recovery

Typically there is a great deal of waste heat available in drainage system of large-scale public bathhouses, such as public bathhouses in schools, barracks and natatoriums. The paper advances a heat pump system used in bathhouses for exhaust heat recovery. The system consists of solar energy collection system, drainage collection system and heat pump system for exhaust heat recovery. In the system, tap water is heated by energy from solar energy collection system, and is used as hot water for bathing at the beginning. At the same time, drainage collection system collects sewage from bathhouses, and then electric heat pump starts up and recovers the exhaust heat in sewage and heats the tap water. In this way, heat is recycled. Practical operation of the system was introduced, and drainage temperature as well as equipment capacity was optimized based on a practical example. Compared with gas-fired (oil-fired, coal-fired, electric) boilers, the system has advantages of lower energy consumption, less pollution and lower operating cost. Therefore, the system has great superiority in energy conservation and has a good application prospect.

scholarly journals Frosting Phenomenon and Frost-Free Technology of Outdoor Air Heat Exchanger for an Air-Source Heat Pump System in China: An Analysis and Review

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2642 ◽  
Author(s):  
Yi Zhang ◽  
Guanmin Zhang ◽  
Aiqun Zhang ◽  
Yinhan Jin ◽  
Ruirui Ru ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Operating Cost ◽  
Heating System ◽  
Coefficient Of Performance ◽  
Outdoor Air ◽  
Pump System ◽  
Heat Pump System ◽  
Reduce Operating Cost ◽  
Air Source Heat Pump

Frost layer on the outdoor air heat exchanger surface in an air-source heat pump (ASHP) can decrease the system coefficient of performance (COP). Although the common defrosting and anti-frosting methods can improve the COP, the periodic defrosting not only reduces the system energy efficiency but also deteriorates the indoor environment. To solve these problems, it is necessary to clearly understand the frosting phenomenon and to achieve the system frost-free operation. This paper focused firstly on the analyses of frosting pathways and frosting maps. Followed by summarizing the characteristics of frost-free technologies. And then the performances of two types of frost-free ASHP (FFASHP) systems were reviewed, and the exergy and economic analysis of a FFASHP heating system were carried out. Finally, the existing problems related to the FFASHP technologies were proposed. Results show that the existing frosting maps need to be further improved. The FFASHP systems can not only achieve continuous frost-free operation but reduce operating cost. And the total COP of the FFASHP heating system is approximately 30–64% higher than that of the conventional ASHP system under the same frosting conditions. However, the investment cost of the FFASHP system increases, and its reliability also needs further field test in a wider frosting environment. In the future, combined with a new frosting map, the control strategy for the FFASHP system should be optimized.

Suitability of Adaptive Self-Regulated e-Learning to Vocational Training

2015 ◽  
Vol 5 (3) ◽  
pp. 31-46 ◽  
Author(s):  
Aurora Dimache ◽  
Thomas Roche ◽  
Simone Kopeinik ◽  
Lisa Christina Winter ◽  
Alexander Nussbaumer ◽  
...  
Keyword(s):  
Heat Pump ◽  
Vocational Training ◽  
Learning Experience ◽  
Pump System ◽  
Heat Pump System ◽  
University Environment ◽  
Self Regulated Learning ◽  
Advantages And Disadvantages ◽  
E Learning ◽  
Level Of Knowledge

Many studies have been conducted, mainly in a university environment, and researchers have identified both advantages and disadvantages of e-learning. Very little is known about the applicability and suitability of e-learning to vocational and skills-based training. The research presented in this paper evaluates an adaptive e-learning model (INNOVRET) which combines skills-based learning by means of the Competence based Knowledge Space Theory (CbKST) with the principles of self-regulated learning (SRL) for a practically-oriented vocational training area, namely highly skilled heat pump system installation, in Ireland. The research methodology employed to carry out this study consists of a participative study to develop the INNOVRET approach for e-learning for heat pump systems installation and an empirical study carried out to evaluate the INNOVRET system. The results show that it is the IT skills of the installers that determine the way they perceive the system and the whole learning experience, as well as the level of knowledge acquired.

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