The Experimental Study of Thermodynamic Performance on R407C Air-Conditioner Hot Water Combined Unit

2011 ◽  
Vol 467-469 ◽  
pp. 549-553
Author(s):  
Hong Song Hu ◽  
Fang Wang ◽  
Jian Zhong Yu ◽  
Wu Hao
Keyword(s):  
Heat Pump ◽  
Paper Analysis ◽  
Hot Water ◽  
Air Conditioner ◽  
Water Heater ◽  
Operation Conditions ◽  
Air Source Heat Pump ◽  
Heat Pump Water Heater ◽  
Environmental Friendly ◽  
Thermodynamic Performance

This paper analysis on the design and the test of an air-conditioner hot water combined unit using environmental friendly refrigerant R407C. Firstly the research status of the system is elaborated for air-source heat pump water heater simply. Then the principle and structure are described on an air-conditioner heat pump followed by a water heater at different running modes and different operation conditions. The hot water experiments of the unit in three seasons have been tested and researched in a multi-functional environmental chamber. Some analysis of the unit’s thermodynamic performance is carried out from the test data for improving such kind of machine afterward.

Analysis of Domestic Hot Water Production Efficiency for Detached Houses

2015 ◽  
Vol 797 ◽  
pp. 185-191
Author(s):  
Arkadiusz Gużda ◽  
Norbert Szmolke
Keyword(s):  
Heat Pump ◽  
Production Efficiency ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Water Production ◽  
Water Heater ◽  
Domestic Hot Water ◽  
Air Source Heat Pump ◽  
Heat Pump Water Heater ◽  
Detached House

The article compares two means for domestic hot water production (DHW) for a detached house that is using gas boiler with a closed combustion chamber and air source heat pump water heater (ASHPWH). An analysis of domestic hot water production using an air source heat pump was made taking into account coefficient of performance listed according to the new BS EN 16147 standard. The analysis of outlay related to the investment and operating costs was also performed. Ultimately, the more profitable choice for domestic hot water production was made.

The Performance Analysis on the 75°C Hot Water of the Air Source Heat Pump Using R134A

2012 ◽  
Vol 482-484 ◽  
pp. 758-762
Author(s):  
Xing Wang Zhu ◽  
Chun Xia Hu ◽  
Yan Li Lv ◽  
Chao Xin Wang ◽  
Yu Gui Su
Keyword(s):  
Heat Pump ◽  
Input Power ◽  
Hot Water ◽  
Water Tank ◽  
Water Heater ◽  
Exhaust Temperature ◽  
Air Source Heat Pump ◽  
Heat Pump Water Heater ◽  
Good Energy ◽  
Saving Effect

In this paper the system of air-source heat pump water heater(ASHPWH) using R134A to get 75°C hot water is proposed. The experiments on the performance of ASHPWH are conducted in two typical conditions, one for 7°C dry bulb temperature and 6°C wet bulb temperature, the other for 20°C dry bulb temperature and 15°C wet bulb temperature. In addition the variations of the suction temperature, the exhaust temperature, the suction pressure, the exhaust pressure, the transient heat capacity, the input power and COPs with the changing of the hot water tank temperature are analyzed. The results show that 75°C hot water can be produced steadily and the COPs are 2.84 and 3.68 respectively in two different conditions, therefore the ASHPWH has good energy saving effect.

The Logical Choice of Auxiliary Heat Source for Solar Energy Water Heating System

2012 ◽  
Vol 512-515 ◽  
pp. 303-306
Author(s):  
Xue Lai Liu ◽  
Guan Zhu Wang ◽  
Yong An Li ◽  
Xiao Feng Zhang
Keyword(s):  
Heat Pump ◽  
Operating Cost ◽  
Water System ◽  
Hot Water ◽  
Low Carbon ◽  
Water Heater ◽  
Low Carbon Economy ◽  
Water Heaters ◽  
Air Source Heat Pump ◽  
Heat Pump Water Heater

This article describes the solar hot water system, and establishes the computational model of hot water system. It analyzes the economical efficiency of solar water heaters which equipped with electric water heaters, gas water heaters and air-source heat pump water heaters. The results show that the initial investment of the system which equipped with an electric water heater and a gas water heater is almost, but the operating cost which equipped with a gas water heater system is lower. The operating cost which equipped with an air-source heat pump water heater is the lowest, though the initial investment is the highest. The solar hot water system which equipped with an air-source heat pump water heater has important reference value for going low-carbon economy road in China.

Analysis on the Operating Characteristics of Solar Water Heater in Combination with Air Source Heat Pump Water Heater

2011 ◽  
Vol 393-395 ◽  
pp. 601-603
Author(s):  
Ai Guo Jiang ◽  
Xiao Zhong Wang
Keyword(s):  
Water Temperature ◽  
Heat Pump ◽  
Hot Water ◽  
Solar Water Heater ◽  
Operating Characteristics ◽  
Water Heater ◽  
Solar Water ◽  
Air Source Heat Pump ◽  
Heat Pump Water Heater ◽  
Collector Efficiency

Solar water heater cannot supply hot water in cloudy and raining days alone. It in combination with air source heat pump water heater (ASHPWH) is a good choice. The performance of the two kinds of water heater is affected by the water temperature. It is important that the ASHPWH operate at a right temperature of the water. A solar water heater with 4m2 flat-plate collector assisted by a 1.5kW ASHPWH is studied in this paper. The results show that both the collector efficiency of the solar water heater and the COP of the ASHPWH system decreases as the water temperature increases. The highest and lowest collector efficiency of the solar water heater are 54.4% and 45.6% respectively. The COP of the ASHPWH system ranges from 6.48 to 2.61 as the water temperature increases. Operating sequences of these two kinds of water heater affect solar energy utilization ratio and the power input of the ASHPWH system.

Energy Consumption Modeling of a Heat Pump System for Combined Space Conditioning and Residential Water Heating in a Typical Household in Quito, Ecuador

2016 ◽  
Author(s):  
Gabriel Agila ◽  
Guillermo Soriano
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
Thermal Storage ◽  
Hot Water ◽  
Water Heating ◽  
Water Heater ◽  
Pump System ◽  
Detailed Model ◽  
Heat Pump Water Heater ◽  
Residential Water

This research develops a detailed model for a Water to Water Heat Pump Water Heater (HPWH), operating for heating and cooling simultaneously, using two water storage tanks as thermal deposits. The primary function of the system is to produce useful heat for domestic hot water services according to the thermal requirements for an average household (two adults and one child) in the city of Quito, Ecuador. The purpose of the project is to analyze the technical and economic feasibility of implementing thermal storage and heat pump technology to provide efficient thermal services and reduce energy consumption; as well as environmental impacts associated with conventional systems for residential water heating. An energy simulation using TRNSYS 17 is carried to evaluate model operation for one year. The purpose of the simulation is to assess and quantifies the performance, energy consumption and potential savings of integrating heat pump systems with thermal energy storage technology, as well as determines the main parameter affecting the efficiency of the system. Finally, a comparative analysis based on annual energy consumption for different ways to produce hot water is conducted. Five alternatives were examined: (1) electric storage water heater; (2) gas fired water heater; (3) solar water heater; (4) air source heat pump water heater; and (5) a heat pump water heater integrated with thermal storage.

Experimental study of a control strategy for a cascade air source heat pump water heater

2017 ◽  
Vol 110 ◽  
pp. 835-843 ◽  
Author(s):  
Minglu Qu ◽  
Yanan Fan ◽  
Jianbo Chen ◽  
Tianrui Li ◽  
Zhao Li ◽  
...  
Keyword(s):  
Experimental Study ◽  
Heat Pump ◽  
Control Strategy ◽  
Water Heater ◽  
Air Source Heat Pump ◽  
Heat Pump Water Heater

Theoretical investigation on the heating performance of a recuperative heat pump water heater using CO2/HCs with large temperature glides in cold regions

2021 ◽  
pp. 1-22
Author(s):  
Jielin Luo ◽  
Qin Wang ◽  
Zhen Zhao ◽  
Kaiyin Yang ◽  
Guangming Chen ◽  
...  
Keyword(s):  
Heat Pump ◽  
Temperature Difference ◽  
Hot Water ◽  
Large Temperature ◽  
Water Heater ◽  
Ambient Temperatures ◽  
Heating Performance ◽  
Heat Pump Water Heater ◽  
Vapor Injection ◽  
Injection Cycle

Abstract Considering the issues of environmental pollution and energy efficiency, heat pumps are gradually replacing traditional coal combustion for heating at low ambient temperatures. In this paper, eco-friendly CO2/HCs with large temperature glides are applied in a single-stage recuperative heat pump water heater. Its heating performance is theoretically investigated under the working condition of producing circulating hot water in typical winter of northern China, with medium temperature difference between supply/return water and large temperature difference between air inlet and water inlet. Due to its simple structure, low initial investment and high efficiency, its potential for producing circulating hot water is demonstrated. Exergy analyses are conducted to reveal the significant influence of the exergy losses of heat exchanger on system performance. For specified CO2/HC, optimal COP is obtained through global optimization of cycle pressures and mixture concentration. The heating performances of different CO2/HCs are compared, among which CO2/R600 and CO2/R600a behave better. Meanwhile, a typical vapor-injection cycle is used to demonstrate priorities on the heating performance of this recuperative cycle, in which the COP of recuperative cycle using CO2/R600 is more than 3.4% higher than that of the vapor-injection cycle. The results obtained in this paper provide a simple and efficient solution for producing circulating hot water at low ambient temperatures.

scholarly journals A Compact and Fast Temperature-Response Heat Pump Water Heater

1997 ◽  
Author(s):  
B. J. Huang ◽  
F. H. Lin
Keyword(s):  
Heat Pump ◽  
Water Discharge ◽  
Temperature Response ◽  
Control Device ◽  
Hot Water ◽  
Water Heater ◽  
Supply Tank ◽  
Heat Pump Water Heater ◽  
Temperature Recovery ◽  
Line Switching

A compact and fast temperature-response heat pump water heater was designed using multiple tanks and a sequential control device. The supply tank was heated as a priority by a freon-line switching device to increase the temperature recovery speed. A dual-tank prototype with 100-liter capacity was built and tested. The experimental results show that the time for temperature recovery of the supply tank from 42°C to 54°C reaches 10–20 minutes and COP reaches 2.0–3.0 during various seasons. The prototype tests show that an energy saving around 50%–70% as compared to the electrical water heater can be obtained. The hot water discharge efficiency of the heat pump is 0.912.

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