scholarly journals OPTIMAL WORKING CONDITIONS OF THE GROUND SOURCE HEAT PUMP FOR HEAT SUPPLY

2017 ◽  
pp. 19-26
Author(s):  
M.K. Bezrodnyi ◽  
N.A. Prytula ◽  
M.A. Gobova
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Working Conditions ◽  
Heat Carrier ◽  
Heating System ◽  
Ground Heat Exchanger ◽  
Heat Exchanger Tube ◽  
Vertical Ground ◽  
Optimum Velocity ◽  
Exchanger Tube

The method of determination of optimal working conditions of vertical ground heat exchanger for heat pump low temperature water heating system, providing minimum energy cost for heat production is presented in this article. It was determined that there is an optimum speed of a heat carrier to which minimum total cost of electricity for heating system in a whole corresponds when using vertical probes for heat pump heating system. The correlation between the characteristics of vertical ground heat exchanger (depth of the well, the intensity of selection of heat from the soil pipe diameter, the velocity of a heat carrier) in its optimal working conditions was found. It is shown that the optimum velocity of a heat carrier in the lower circuit depends on the depth of the well, the heat exchanger tube diameter, and is almost independent of temperature conditions works of heat pump systems. It is found that the higher velocity observed at the beginning of the heating period in view of energy storage in the ground. Optimum coolant velocity should decrease until the end of the heating season to ensure minimum specific energy expenditure at HPS. Also noted that an optimum velocity increases with increasing depth of the well and with decreasing diameter of the heat exchanger tube. The established correlation may be used when determining the optimum operating conditions of the vertical ground heat pump heat exchanger low-temperature heating systems with a plan to maximize their energy efficiency. Bibl. 8, Fig. 7.

scholarly journals Influence of Heat Exchanger Tube Layout on Performance of Heat Pump System for Electric Cars

2017 ◽  
Vol 105 ◽  
pp. 5085-5090 ◽  
Author(s):  
Xiaoqiang Zhang ◽  
Qingfeng Xue ◽  
Huiming Zou ◽  
Jixuan Liu ◽  
Changqing Tian ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Heat Exchanger Tube ◽  
Pump System ◽  
Heat Pump System ◽  
Electric Cars ◽  
Exchanger Tube

scholarly journals The Solar-Assisted Vertical Ground Source Heat Pump System in Cold Climates—A Case Study

Proceedings ◽  
2020 ◽  
Vol 51 (1) ◽  
pp. 24
Author(s):  
Piotr Rynkowski
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Solar Collector ◽  
Heat Extraction ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Vertical Ground

In this paper, experimental studies were performed for a solar ground source heat pump system (SGSHPS) with a vertical ground heat exchanger (VGHE). The experiment was operated during the summer in 2018. The heat from the solar collector was monitored by measuring the inlet and outlet temperatures and flow rate of the heat transfer fluids. An energy equilibrium balance carried out indicates heat extraction from the solar collector to the ground heat exchanger. It has been established that clear impact is achieved within a radius of 5 m. The average temperature of the actively regenerated borehole was higher than that of the undisturbed profile, which has a direct impact on the significant benefits of the coefficient of performance (COP) of the ground source heat pump system (GSHPS) and effectively helps soil regeneration. The average efficiency ratio of the heat transferred from solar radiation to soil in the SGSHPS was 42.3%.

Analysis and Research on the Performance of the Ground Source Heat Pump System in Different Areas of China

2011 ◽  
Vol 148-149 ◽  
pp. 1137-1140 ◽  
Author(s):  
Zi Shu Qi ◽  
Qing Gao ◽  
Yan Liu ◽  
Y.Y. Yan ◽  
Jeffrey D. Spitler
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Fluid Temperature ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Time Step ◽  
Heating And Cooling ◽  
Ground Source ◽  
Vertical Ground ◽  
Cooling Loads

In the paper, it is to describe the performance of the vertical ground heat exchangers (GHE) in different areas of China. The energy consumption of ground source heat pump (GSHP) system is based on the instantaneous fluid temperature at the heat pump inlet. This temperature defines the GSHP coefficient of performance and hence the electricity consumption required in order to fulfill the energy demands of the building. A mathematical model for simulation of vertical ground heat exchanger system is built based on long time-step theory. The design methodology is based on a simulation that predicts the temperature response of the ground heat exchanger to hourly heating and cooling loads demand in 20 years. This paper presents GSHP system can achieve energy performance in buildings that heating and cooling loads all the year round in different areas.

Comparison of Borehole Thermal Resistance Values of Ground Heat Exchanger Obtained by Several Methods

2013 ◽  
Vol 732-733 ◽  
pp. 103-108 ◽  
Author(s):  
Han Byul Kang ◽  
Seok Yoon ◽  
Gyu Hyun Go ◽  
Seung Rae Lee
Keyword(s):  
Heat Exchanger ◽  
Thermal Resistance ◽  
Heat Pump ◽  
Heating System ◽  
Geothermal System ◽  
Ground Heat Exchanger ◽  
Ubiquitous System ◽  
Borehole Thermal Resistance ◽  
Quantity Of Heat ◽  
Emission Of Greenhouse Gases

The Ground-Coupled or Source Heat Pump (GCHP/GSHP) system is increasingly being considered as an alternative to traditional cooling/heating system because it can reduce the emission of greenhouse gases. The GCHP/GSHP system uses sustainable ground temperature to emit heat during the summer and to extract heat during the winter. It is a ubiquitous system because it can be used at any time or place and semi-permanent energy. The geothermal system is composed of Ground Heat Exchanger (GHE), heat pump and load facilities. The GHE is embedded in a borehole, which is made up of GHE and grout. The borehole thermal resistance is the most important parameter in designing the geothermal system because it shows the quantity of heat transfer in the borehole. There are many methods to estimate the borehole thermal resistance. Thermal Performance Tests (TPTs) were conducted to directly measure the borehole thermal resistance of several kinds of GHEs. Then the experiment results and analytical results were compared in order to select the most accurate methods to evaluate the borehole thermal resistance.

scholarly journals Numerical research on thermal stress of steam cooler tube sheet mechanical structure

2021 ◽  
Vol 2125 (1) ◽  
pp. 012013
Author(s):  
Jun Wu ◽  
Zhaoli Zheng ◽  
Yong Li ◽  
Jie Pang ◽  
Zhiwu Ke ◽  
...  
Keyword(s):  
Power Generation ◽  
Thermal Stress ◽  
Heat Exchanger ◽  
Working Conditions ◽  
Tube Sheet ◽  
Generation System ◽  
Heat Exchanger Tube ◽  
Temperature Load ◽  
Power Generation System ◽  
Exchanger Tube

Abstract Steam cooler is one of the most important mechanical equipment in thermal power generation system and nuclear power generation system. The steam cooler bears a huge temperature gradient load when the working conditions are switched. In order to analyze the thermal stress of steam cooler tube sheet with high temperature load under harsh working conditions, the thermal-structural coupling analysis model of steam cooler tube sheet is constructed with finite element method. The results show that the stress concentration exists at the position connection between heat exchanger tube and cylinder. The maximum stress is located at the outermost heat exchanger tube with the peak stress of 320MPa. The heat exchanger tube layout alone cause higher stress. This situation should be avoided in the design of heat exchanger tube sheet. Furthermore, the strength and safety of the steam cooler tube sheet are evaluated with the stress linearization method. The steam cooler tube sheet design meets the safety requirements of structural strength under high temperature load.

Sign in / Sign up

Export Citation Format

Share Document