Energy Consumption Analysis of Residential Central Air Conditioning Systems

2009 ◽  
Author(s):  
Bing Wei ◽  
Huayi Yang
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
Air Conditioning ◽  
Pump Unit ◽  
Pump System ◽  
Heat Pump System ◽  
Coil System ◽  
Heat Pump Unit ◽  
Central Air Conditioning ◽  
Air Conditioning Systems

Nowadays the energy crisis has been more and more severe all over the world. In China there is enormous energy source, but due to the large number of population, the average possession of the total energy is lower, and the energy supply is relatively less. Enormous energy consumption of air conditioning systems in the residential buildings makes the energy conservation more important. The residential central air conditioning systems are being widely used due to its advantages of easy control and low operating cost. But there are still many problems to be resolved, of which the energy consumption of the residential central air-conditioning systems is a hot issue. The main cold and heat sources for residential central air conditioning systems are air-cooled heat pump unit, household gas air conditioning unit, air-cooled chiller unit/gas-fired boiler and water loop heat pump unit. The terminal facilities suited for the anterior three units are the fan coil units, and the terminal of the last water loop heat pump unit is normally indoor unit. The combined utilization of the heat and cold source units with their terminal units keep the indoor environment in desired state all the year. In this paper, based on an actual example, the basic principles of four systems mentioned above are outlined and analyzed, and four schemes are compared. By using the method of equivalent weight full load operation time, the annual energy consumptions of the four schemes are calculated and analyzed. Comparing the annual primary energy consumption of four schemes, the following conclusions can be drawn: in the case studied, the energy consumption of the household gas-fired air conditioning unit with fan coil system is the maximum, the consumption of the air-cooled chiller unit/gas-fired boiler with fan coil system is the next, then is the air-cooled heat pump with fan coil system, and that of the water loop heat pump system is the minimum. It can be observed that the water loop heat pump system is the optimal one and is the best on energy conservation. Through the study of this paper, the minimum energy consumption system is chosen so as to give the references for the energy savings of air-conditioning systems in the practice.

Economic Evaluation of Residential Central Air Conditioning Systems

2010 ◽  
Author(s):  
Bing Wei ◽  
Huayi Yang ◽  
Wen Luo
Keyword(s):  
Natural Gas ◽  
Heat Pump ◽  
Annual Cost ◽  
Air Conditioning ◽  
Total Annual Cost ◽  
Pump System ◽  
Air Conditioning System ◽  
Heat Pump System ◽  
Central Air Conditioning ◽  
Air Conditioning Systems

Nowadays the residential central air conditioning systems are being widely used in China, and there are several different system options in the actual applications. Different residential central air conditioning systems will have different initial costs and operating costs. It is quite important for the decision-makers to choose an economical air conditioning system. In this paper six residential central air conditioning systems are introduced, which are the air-source heat pump system, household gas-fired air conditioning system, air-cooled chiller unit/gas-fired boiler system, water loop heat pump system, ground-source heat pump system and solar heat pump system. By using the method of dynamic total annual cost with an example of residential building in Beijing, the total annual costs of chosen six air conditioning systems are calculated and compared, and the sensitivity of total annual cost are analyzed with the rates of electricity and natural gas being used as the sensitive factors. The results show that the total annual cost of water loop heat pump system is the minimum among the six systems, which is the optimal option under the given conditions. The rates of electricity and natural gas will influence the raking of systems.

Experimental Study on New Sewage Source Heat Pump Unit

2013 ◽  
Vol 316-317 ◽  
pp. 49-52
Author(s):  
Zhi Yi Wang ◽  
Jian Jun Li ◽  
Zu Dong Pan
Keyword(s):  
Heat Pump ◽  
Volume Ratio ◽  
Pump Unit ◽  
Pump System ◽  
Dual Purpose ◽  
Heat Pump System ◽  
Urban Sewage ◽  
Existing Problems ◽  
Heat Pump Unit ◽  
Sewage Source

By the analysis of the current technical conditions and existing problems, some improvements are carried out on the urban sewage source heat pump unit. are as follows: Refrigerants side switch sewage source heat pump system, dual-purpose heat exchange for evaporating and condensing & wastewater can enter the unit directly are of the main features of the improved units. Some important techniques, such as inverter screw compressor and variable compressor inner volume ratio are used to the improved unit at the same time. From the authoritative organization’s test, the improved sewage-source heat pump unit has an excellence performance in the nominal cooling and heating conditions.

scholarly journals Air-to-water heat pump assessment: Part 2 – Exergetic and exergoeconomic analyses

2021 ◽  
Vol 327 ◽  
pp. 01010
Author(s):  
Nadezhda Doseva ◽  
Daniela Chakyrova
Keyword(s):  
Heat Pump ◽  
Heat Rate ◽  
Experimental Tests ◽  
Exergetic Efficiency ◽  
Ambient Conditions ◽  
Pump Unit ◽  
Pump System ◽  
Heat Pump System ◽  
Heat Pump Unit ◽  
Exergoeconomic Analysis

This study is part 2 of the investigation on the exergetic and exergoeconomic parameters of an existing system with an air-to-water heat pump unit as a heat source. Part 1 presents the used experimental setup. The main aim of the conducted experimental tests is to develop models of produced heat rate and energetic COP at different ambient conditions. The obtained data is used in Part 2 of the study where the exergetinc and exergoeconomic assessment is carried out. The exergetic and exergoeconomic analysis was performed at dynamically changing ambient parameters. The considered operation modes of the air-to-water heat pump (AWHP) unit and backup heater (BUH) were evaluated based on Seasonal Exergetic Efficiency. For the exergoeconomic analysis, the SPECO method is used. Thus, this paper provides an exhaustive understanding of the exergy and exergoeconomic performance of the considered air-to-water heat pump system.

Experiment Study on Ground Temperature Recovery and Operating Performance of Intermittent Heat Storage in GSHP System

2010 ◽  
Author(s):  
Sufen Li ◽  
Lanhua Dai ◽  
Yan Shang
Keyword(s):  
Soil Temperature ◽  
Heat Pump ◽  
Heat Exchangers ◽  
Heat Storage ◽  
Borehole Wall ◽  
Pump Unit ◽  
Pump System ◽  
Heat Pump System ◽  
Heat Pump Unit ◽  
The Impact

The ground source heat pump system (GSHP) continuous operation will result in heat accumulation of the soil around the underground heat exchangers leading the descend operation performance of heat pump system. Based on experiment of GSHP system in summer season, the temperature distribution of humid soil around the vertical boreholes, the power consumption of the heat pump unit, the water temperature in the inlet and outlet of the underground heat exchangers, the heat release rate of per unit length of the buried pipes in humid soil and the cooling coefficient of performance (COP) for the heat pump unit were acquired during the different intermittent heat storage modes. This study investigated the impact of soil temperature change around the borehole wall on the performance of heat pump operation, the influence of intermittent heat storage on the soil temperature near the borehole wall and the performance of heat pump unit, and the effect of intermittent heat storage process on the recovery rate of soil temperature. The results showed that proper control of the operation and interval time of GSHP can effectively improve the soil temperature field around the underground heat exchangers and enhance the performance of GSHP system, thus achieving high efficiency operation of heat pump units.

scholarly journals Performance of heat pump unit with capillary heat exchanger*

2018 ◽  
Vol 175 ◽  
pp. 02031
Author(s):  
Zhenpeng Bai ◽  
Yanfeng Li
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Clean Energy ◽  
Pump Unit ◽  
Cooling Mode ◽  
Pump System ◽  
Heat Pump System ◽  
Collection Device ◽  
Heat Pump Unit ◽  
Shallow Geothermal Energy

The heat pump system utilizes shallow geothermal energy in the coastal areas, which not only uses clean energy but also contributes to energy conservation and environmental protection. This paper studies the performance of a heat pump system applied a capillary heat exchanger as an energy collection device. The numerical performance of capillary heat pump showed a good agreement with the experimental data in the winter heating mode and the summer cooling mode. It was concluded that the COP of the heat pump unit using the capillary heat exchanger was 5.32 in winter and 4.32 in summer.

The Contrast Experimental Study of Sewage Source Heat Pump System and Ground Source Heat Pump System in Hot Summer and Cold Winter Area

2014 ◽  
Vol 953-954 ◽  
pp. 698-704 ◽  
Author(s):  
Zhen Zhao Liu ◽  
Bo Song ◽  
Ying Ning Hu ◽  
Shan Shan Hu
Keyword(s):  
Heat Pump ◽  
Ground Source Heat Pump ◽  
Cold Winter ◽  
Pump Unit ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Heat Pump Unit ◽  
Practical Engineering ◽  
Sewage Source

For two practical engineering case in a University in Guilin, this paper mainly introduces the performance of sewage-source heat pump and ground source heat pump and compare the running status in two kinds of system. The studies have shown that the sewage source heat pump unit COP at about 3.9, the system COP at about 3.3, ground source heat pump unit COP at about 4.5, the system COP at about 3.4.

scholarly journals Operational Performance Characterization of a Heat Pump System Utilizing Recycled Water as Heat Sink and Heat Source in a Cool and Dry Climate

Energies ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 211 ◽  
Author(s):  
Piljae Im ◽  
Xiaobing Liu ◽  
Hugh Henderson
Keyword(s):  
United States ◽  
Energy Consumption ◽  
Heat Pump ◽  
Air Conditioning ◽  
The United States ◽  
Heat Pumps ◽  
Recycled Water ◽  
Pump System ◽  
Performance Characterization ◽  
Heat Pump System

The wastewater leaving from homes and businesses contains abundant low-grade energy, which can be utilized through heat pump technology to heat and cool buildings. Although the energy in the wastewater has been successfully utilized to condition buildings in other countries, it is barely utilized in the United States, until recently. In 2013, the Denver Museum of Nature & Science at Denver, the United States implemented a unique heat pump system that utilizes recycled wastewater from a municipal water system to cool and heat its 13,000 m2 new addition. This recycled water heat pump (RWHP) system uses seven 105 kW (cooling capacity) modular water-to-water heat pumps (WWHPs). Each WWHP uses R-410A refrigerant, has two compressors, and can independently provide either 52 °C hot water (HW) or 7 °C chilled water (CHW) to the building. This paper presents performance characterization results of this RWHP system based on the measured data from December 2014 through August 2015. The annual energy consumption of the RWHP system was also calculated and compared with that of a baseline Heating, Ventilation, and Air Conditioning (HVAC) system which meets the minimum energy efficiencies that are allowed by American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) 90.1-2013. The performance analysis results indicate that recycled water temperatures were favorable for effective operation of heat pumps. As a result, on an annual basis, the RWHP system avoided 50% of source energy consumption (resulting from reduction in natural gas consumption although electricity consumption was increased slightly), reduced CO2 emissions by 41%, and saved 34% in energy costs as compared with the baseline system.

Experimental Study on Temperature Lifting of Heat Pump System at Initial Drying Stage

2012 ◽  
Vol 548 ◽  
pp. 595-599
Author(s):  
Xiu Jun Zhang ◽  
Li Na Shang
Keyword(s):  
Heat Pump ◽  
Electrical Heating ◽  
Drying Rate ◽  
Pump Unit ◽  
Pump System ◽  
Heat Pump System ◽  
Initial Stage ◽  
Heat Pump Unit ◽  
Temperature Ranges ◽  
Heat Pump Drying

In order to increase drying rate at initial stage, the heat pump drying systems often lift temperature of the drying air assisted with electrical heating. However, power consumption of drying systems is raised. By taking advantage of an auxiliary evaporator and adjusting its fluid fluxes, the heat pump drying systems can acquire the same results of lifting temperature as those assisted with electrical heating. Experiment results demonstrate that the heat pump unit with an auxiliary evaporator is able to not only lift temperature quickly at initial drying stage, but also enhance the material dehumidification obviously when drying temperature ranges from 40°C to 55°C.

Simulative Study on Solar-Assisted Air Source Heat Pump System

2013 ◽  
Vol 671-674 ◽  
pp. 2141-2144 ◽  
Author(s):  
Qiang Wang ◽  
Feng Zhen Liu ◽  
Li Jun Hou ◽  
Jian Hua Gao
Keyword(s):  
Heat Pump ◽  
Operating Conditions ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Pump Unit ◽  
Pump System ◽  
Heat Pump System ◽  
Air Source Heat Pump ◽  
Heat Pump Unit ◽  
The Stability

A solar assisted air source heat pump unit is designed. The mathematical model of the unit is established and two hybrid operating conditions of the system are simulated. The simulative studying results shows that in winter the solar assisted air source heat pump unit can make full use of solar energy and the coefficient of performance (COP) of air source heat pump can be improved. In summer the cooling heat of air source heat pump could be recovered to improve the stability of solar hot water collector and the COP of the air source heat pump unit is greatly improved. The performance of solar assisted air source heat pump unit is better than that of with no solar assisted air source heat pump.

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.

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