Optimization for Heating System Schemes Based on GRA Method

2008 ◽  
Author(s):  
Wei Bing ◽  
Li Li
Keyword(s):  
Power System ◽  
Operating Cost ◽  
Heating System ◽  
Social Benefit ◽  
High Energy ◽  
Pump System ◽  
Heat Pump System ◽  
Decision Making Problem ◽  
Calculation Results ◽  
Optimal Heating

In China, the overall economical performances of heating systems are not very high, there are still some problems of high energy consumption, high gas emission and low heat utilization. The energy conversation and emission reduction are two most important things. The option of the heating system schemes is the key to improve such situation. An optimal heating scheme will be a good beginning to the whole heating system. In this paper, the GRA (Grey Relation Analysis) method is introduced and used, and with the example of a heating district, the most used and upcoming used heating schemes are listed, calculated and compared by using the method of GRA. The option of a heating system scheme is a typical multi-objective decision-making problem. The schemes are the district boiler heating system (including gas-fired, oil-fired, and coal-fired boilers), solar energy heat pump system and combined heating and power system etc. In the process of optimization calculation, the aspects of energy saving, economics benefit, environment benefit and social benefit are concerned about, and the initial cost, operating cost, employment life, environment influence and system reliability are taken into account. According to the calculation results, combined heating and power system is proposed to be optimal heating system scheme.

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.

The Energy-Saving and Carbon Emission Analysis of Solar-Assisted Air Source Heat Pump System for Hot Water Supply

2015 ◽  
Vol 799-800 ◽  
pp. 1440-1444
Author(s):  
Yuan Yu ◽  
Ke Zhi Yu ◽  
Hai Zhang
Keyword(s):  
Energy Consumption ◽  
Carbon Emission ◽  
Operating Cost ◽  
Heating System ◽  
High Energy ◽  
Hot Water ◽  
Cost Comparison ◽  
Water Heating ◽  
Emission Analysis ◽  
Pump System

The innovation of solar water heating system of students living community in Shanghai Ocean University is illustrated in this paper. A new water heating system including solar, air source heat pumps and gas boiler is established owing to the high energy consumption of original system. The comprehensive energy consumption, carbon emission and operating cost comparison between the original and new system is analysed based on the measured water, power and natural gas consumption. The results show that the comprehensive energy consumption is reduced by about 27.5%, the carbon commission decreased by 6%, and the operating costs reduced by approximately 23.6%, which means the new hot water system is successful.

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.

scholarly journals Analysis and Research on Energy-Saving Reconstruction of Building Heating System

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Yongqiang Liu ◽  
Zhanfang Huang
Keyword(s):  
Heat Source ◽  
Heat Pump ◽  
Original System ◽  
Water Source ◽  
Heating System ◽  
High Energy ◽  
Pipe Network ◽  
Pump System ◽  
Heat Pump System ◽  
Central Heating

A building heating system had high energy consumption and did not meet the requirements of environmental protection, so it was needed to be reformed. After recalculating the heat load, it was found that the heat source, pipe network specification, and radiator area of the original heating system were oversized. After comparing with a gas-fired boiler, the heat source was transformed into the water source heat pump system. The water supply temperature of the water source heat pump was lower than that of the boiler. Generally, it seemed necessary to increase the radiator area. However, after calculation and verification, when the supply and return water temperature was 65/58°C, the system operated continuously and the original pipe network and radiator could still ensure the indoor temperature of 16°C. The total cost of transformation was 11.5 million Chinese Yuan. After analyzing the operation data of the new system, the water source heat pump system could save 82.6% energy compared with the original system and 29.6% cost compared with the central heating system. The transformation is successful, and the experience is worth popularizing.

scholarly journals Exergoeconomic optimization of solar heat pump systems of heat supply

2020 ◽  
Vol 216 ◽  
pp. 01125
Author(s):  
Mexriya Koroly ◽  
Anvar Anarbaev ◽  
Alisher Usmanov ◽  
Kuvondyk Soliev
Keyword(s):  
Heat Pump ◽  
High Reliability ◽  
High Energy ◽  
Economic Optimization ◽  
Water Heater ◽  
Pump System ◽  
Heat Pump System ◽  
Solar Heat ◽  
Heating And Cooling ◽  
Industrial Heating

In this paper, there is analyzed the results of exergy economic optimization of heat-cooling supply in building by using the solar heat pump system. It is possible to realize a system having high reliability in operation of the system. The solar heat pump system according to the present technical decision has high energy efficiency while ensuring reliability, and is useful as a domestic air conditioning and heating water heater. It can also be applied to uses such as industrial heating and cooling devices.

The design of a seasonal heat storage system with a geothermal heat pump for a residential building in Tehran

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Akbar Alidadi Shamsabadi ◽  
Mehdi Jahangiri ◽  
Tayebeh Rezaei ◽  
Rouhollah Yadollahi Farsani ◽  
Ali Seryani ◽  
...  
Keyword(s):  
Heat Pump ◽  
Heating System ◽  
Coefficient Of Performance ◽  
Maximum Temperature ◽  
Software Environment ◽  
Geothermal Heat ◽  
Pump System ◽  
Matlab Software ◽  
Content Type ◽  
Heat Pump System

Purpose In this study, a solar water heating system along with a seasonal thermal energy storage and a heat pump is designed for a villa with an area of 192 m2 in Tehran, the capital of Iran. Design/methodology/approach According to the material and the area of the residential space, the required heating of the building was calculated manually and then the thermodynamic analysis of the system and simulation was done in MATLAB software. Finally, regarding the waste of system, an efficient solar heating system, providing all the required energy to heat the building, was obtained. Findings The surface area of the solar collector is equal to 46 m2, the capacity of the tank is about 2,850 m3, insulation thickness stands at 55 cm and the coefficient of performance in required heat pump is accounted to about 9.02. Also, according to the assessments, the maximum level of received energy by the collector in this system occurs at a maximum temperature of 68ºC. Originality/value To the best of the authors’ knowledge, in the present work, for the first time, using mathematical modeling and analyzing of the first and second laws of thermodynamics, as well as using of computational code in MATLAB software environment, the solar-assisted ground source heat pump system is simulated in a residential unit located in Tehran.

Solar Assisted Heat Pump System for Floor Heating

2011 ◽  
Vol 354-355 ◽  
pp. 828-832
Author(s):  
Xi Ming Zhang ◽  
Dong Hui Pan ◽  
Qing Bo Zhang
Keyword(s):  
Heat Pump ◽  
Heating System ◽  
Primary Energy ◽  
Conventional System ◽  
Pump System ◽  
Storage Container ◽  
Heat Pump System ◽  
Gas Heating ◽  
Supply Systems ◽  
Floor Heating

Solar assisted heat pump system(SAHP) has a wide and wonderful future for its excellent performance in energy saving and environment protection. Solar assisted heat pump system for floor heating is combined by solar assisted heat pump and floor heating. Presents the operating principal and key equipments and designs solar collector, thermal storage container, floor-coil radiator and so on， discusses the feasibility of introduction of a combined heating system for an energy building in Qingdao. On the base of this, two types of energy supply systems, the conventional system(gas heating and SAHP system, were set. Those two types of systems were evaluated regarding energy efficiency and environmental load. According to the results, compared with the conventional system, SAHP system was capable of reducing the primary energy consumption and CO2 emission, respectively 20% and 19.2%.

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.

A TRNSYS/GROCS Simulation of the TECH House I Ground-Coupled Series Solar-Assisted Heat Pump System

1983 ◽  
Vol 105 (4) ◽  
pp. 446-453 ◽  
Author(s):  
D. J. Roeder ◽  
R. L. Reid
Keyword(s):  
Heat Pump ◽  
Storage Tank ◽  
Heating System ◽  
Electric Resistance ◽  
Heating Season ◽  
Pump System ◽  
Heat Pump System ◽  
Seasonal Performance ◽  
The University ◽  
Better Than

The series solar-assisted heat pump heating system with ground-coupled storage in The University of Tennessee’s TECH House I in Knoxville, Tennessee, has been modeled using TRNSYS/GROCS and was compared to the experimental performance for the 1980–81 heating season. The simulation results were within 8 percent of the experimental measurements. Both simulation and experimental results showed that ground coupling of thermal storage led to the elimination of electric resistance backup heat and a large reduction in the peak heating demand of the house. Results of a parametric study showed that, in general, a ground-coupled storage tank performs better than a storage tank placed outdoors in the Knoxville area. Application of a next generation heat pump resulted in the most significant impact on the seasonal performance factor. As expected, higher performance collectors and larger collector areas led to higher system seasonal performance. An economic analysis showed that the series solar heat pump system cannot economically compete with the stand-alone heat pump system in the Knoxville area.

Sustainability Study on GCHP Heating System in Severe Cold Area of China

2013 ◽  
Vol 411-414 ◽  
pp. 3084-3087
Author(s):  
Shu Zhang ◽  
Mao Yu Zheng
Keyword(s):  
Heat Pump ◽  
Thermal Load ◽  
Heating System ◽  
Coefficient Of Performance ◽  
Heating Effect ◽  
Pump System ◽  
Heat Pump System ◽  
Heating Performance ◽  
Long Time ◽  
Cold Area

In this paper, the mathematical models of a GCHP system and a Ground-couple heat pump system with air-soil thermal storage (GCHPASTS) were developed, and the 20-year performances of the two systems were simulated in severe cold area of china, respectively. The results show that the soil temperature declines gradually during the operation of a GCHP system, which leads to the decrease of the coefficient of performance (COP) and the heating effect of the heat pump year after year. On the contrary, the balance of ground thermal load can be realized during the operation of a GCHPASTS system, and the heating performance of heat pump is stable and efficient for long time. So, it can be proved that a GCHP system cant be used for heating alone, while a GCHPASTS system is feasibility.

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