Study on performance of a novel energy-efficient heat pump system using liquid desiccant

2018 ◽  
Vol 219 ◽  
pp. 325-337 ◽  
Author(s):  
Nannan Shan ◽  
Yonggao Yin ◽  
Xiaosong Zhang
Keyword(s):  
Heat Pump ◽  
Energy Efficient ◽  
Liquid Desiccant ◽  
Pump System ◽  
Heat Pump System

scholarly journals Energy Efficient Approaches by Retrofitting Heat Pumps Water Heating System for a University Dormitory

Buildings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 356
Author(s):  
Fujen Wang ◽  
Kusnandar ◽  
Hungwen Lin ◽  
Minghua Tsai
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Heat Pump ◽  
Energy Efficient ◽  
Energy Savings ◽  
Heating System ◽  
Energy Simulation ◽  
Water Heating ◽  
Pump System ◽  
Heat Pump System

With the cost of energy rising, the value of conservation grows. Interest in energy efficiency could be a sound investment or a necessary public policy. Heat pump systems provide economical alternatives of recovering heat from different sources for use in various applications. The objective of this study is to present the strategic approach on the energy efficient analysis of the water heating system retrofitted by applying a heat pump system in the dormitory of a university. Energy savings were determined by comparing field measurements of water consumption, water temperature and power consumption of the overall system before (electric resistance heating system) and after (heat pump heating system) the implementation of this project. Furthermore, the building energy simulation code (eQuest) has been applied to verify and predict the long-term energy consumption for both water heating systems. The results from energy modelling revealed the good agreement for energy simulation and field measurement data and the improvement of energy efficiency and energy savings could be achieved satisfactorily by retrofitting of a heat pump system. The energy conversion efficiency of hot water for energy consumption at 0.63 (Mcal/Mcal) could be achieved after the application of heat pump water heating system. It also presented the annual saving about USD 20,000 (NTD 600,000) for the dorm by using a heat pump heating system under the electrical billing rate of Taiwan.

scholarly journals Recent Advances in Transcritical CO2 (R744) Heat Pump System: A Review

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 457 ◽  
Author(s):  
Rajib Rony ◽  
Huojun Yang ◽  
Sumathy Krishnan ◽  
Jongchul Song
Keyword(s):  
Heat Pump ◽  
Energy Efficient ◽  
Control Strategies ◽  
Environmentally Benign ◽  
Pump System ◽  
Heat Pump System ◽  
System A ◽  
Advanced Control ◽  
Recent Developments ◽  
Low Global Warming Potential

Heat pump (HP) is one of the most energy efficient tools for address heating and possibly cooling needs in buildings. Growing environmental concerns over conventional HP refrigerants, chlorofluorocarbons (CFCs), and hydrofluorocarbons (HFCs) have forced legislators and researchers to look for alternatives. As such, carbon dioxide (R744/CO2) has come to light due to its low global warming potential (GWP) and zero ozone depleting characteristics. Even though CO2 is environmentally benign, the performance of CO2 HP has been of concern since its inception. To improve the performance of CO2 HP, research has been playing a pivotal role in developing functional designs of heat exchangers, expansion devices, and compressors to suit the CO2 transcritical cycle. Different CO2 HP cycles coupled with auxiliary components, hybrid systems, and refrigerant mixtures along with advanced control strategies have been applied and tested. This paper presents a complete overview of the most recent developments of transcritical CO2 HPs, their components, and applications.

scholarly journals Experimental investigation of a novel PVt/heat pump system for energy-efficient poultry houses

2018 ◽  
Vol 13 (4) ◽  
pp. 404-413 ◽  
Author(s):  
Tugba Gurler ◽  
Theo Elmer ◽  
Yuanlong Cui ◽  
Siddig Omer ◽  
Saffa Riffat
Keyword(s):  
Experimental Investigation ◽  
Heat Pump ◽  
Energy Efficient ◽  
Pump System ◽  
Heat Pump System ◽  
Poultry Houses

3 kW Class Displacer Type Stirling Engine for Heat Pump System

1987 ◽  
Author(s):  
T. Nomaguchi ◽  
T. Suganami ◽  
M. Fujiwara ◽  
M. Sakai ◽  
T. Koda ◽  
...  
Keyword(s):  
Heat Pump ◽  
Stirling Engine ◽  
Pump System ◽  
Heat Pump System

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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