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.

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.

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.

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.

Research and Development of Ground Source Heat Pump Unit Remote Real-Time Monitoring System

2011 ◽  
Vol 121-126 ◽  
pp. 2162-2166
Author(s):  
Yan Mei Meng ◽  
Hai Feng Pang ◽  
Ying Ning Hu ◽  
Quan Zhou ◽  
Dao Yang Li ◽  
...  
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Heat Pump ◽  
Host Computer ◽  
Ground Source Heat Pump ◽  
Real Time Monitoring ◽  
Pump Unit ◽  
Pump System ◽  
Ground Source ◽  
Heat Pump Unit

This paper describes the research and implementation of ground source heat pump unit remote real-time monitoring system, researches in remote real-time monitoring system's overall design, hardware design, software design and implementation of OPC communication. The host computer takes advantage of the human-computer interaction interface of configuration software to achieve the remote real-time monitoring for ground source heat pump unit's running state; the lower computer uses data collector to intensively collect the data which is measured by field measuring instruments, and to achieve remote data transmission based on Ethernet, and then to carry out the communication between the host computer and the lower computer via OPC technology. The results show that the system achieves remote real-time monitoring of ground source heat pump unit, and is stable, easy to operate and provides a reliable basis for the actual energy saving effect's evaluation of ground source heat pump system.

scholarly journals Numerical Analysis and Preliminary Experiment of a Solar Assisted Heat Pump Drying System for Chinese Wolfberry

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4306 ◽  
Author(s):  
Zhongting Hu ◽  
Sheng Zhang ◽  
Wenfeng Chu ◽  
Wei He ◽  
Cairui Yu ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
Electric Energy ◽  
Energy Performance ◽  
Operating Conditions ◽  
Pump System ◽  
Heat Pump System ◽  
Electric Energy Consumption ◽  
Drying System ◽  
Heat Pump Drying

The present work investigated a solar assisted heat pump system for drying Chinese wolfberry. The kinetic characteristic was firstly analyzed through a series of lab experiments. It was concluded that the Page model was the most suitable for predicting the heat and mass transfer of the wolfberry. Based on the wolfberry kinetic model, solar collector model and chamber air model, the coupled drying system model was developed. The accuracy of the mathematic model was determined through comparing with the preliminary experimental results. The influence of operating conditions on the thermal and energy performance of the dryer for the different operating mode was discussed. The drying weight of no more than 75 kg may be preferable in the stand-alone solar drying mode, and less than 15 h was needed to be dried. The electric energy consumption in the solar assisted the heat pump drying mode was lower than that in the stand-alone heat pump mode, and it was recommended that about 50 kg of wolfberry to be dried in the solar assisted heat pump system. Compared to the autumn drying, the reduction in the electric energy consumption was around 9.1 kWh during the 11 h summer drying process. The obtained results demonstrated the feasibility of the combined system for drying wolfberry, and also can provide the basic theoretical and experimental data support for the following research.

Influence of Temperature Parameter Change on Lithium Bromide Absorption Heat Pump Performance

2013 ◽  
Vol 291-294 ◽  
pp. 1670-1674
Author(s):  
Biao Li ◽  
Jiang Fan
Keyword(s):  
Power Plant ◽  
Heat Pump ◽  
Waste Heat ◽  
Lithium Bromide ◽  
Optimal Operation ◽  
Pump System ◽  
Absorption Heat Pump ◽  
Heat Pump System ◽  
Heat Pump Unit ◽  
The Impact

It is the new way of the thermal power plant energy conservation to recycling plant circulating water waste heat for heating with the heat pump technology. The recovery of low temperature waste heat is the background. And lithium bromide absorption heat pump is the object of this study. The impact of changes in temperature parameters on the performance of heat pump unit is analyzed. As a theoretical basis for the design of the heat pump system and power plant heat pump unit’s optimal operation provide a reference. The result provides a theoretical reference for the optimal operation of the heat pump system design and power plant heat pump units.

Sign in / Sign up

Export Citation Format

Share Document