scholarly journals The energy source for heat pumps with vertical heat exchangers

2018 ◽  
Vol 44 ◽  
pp. 00157
Author(s):  
Piotr Rynkowski
Keyword(s):  
Heat Pump ◽  
Heat Exchangers ◽  
Electricity Consumption ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Temperature Analysis ◽  
Heat Flows ◽  
Ground Heat Exchangers ◽  
Vertical Heat ◽  
Vertical Ground

The paper presents the ground temperature analysis, heat flows and energy transferred from the soil massif by the vertical ground heat exchangers (VGHE). Three cases – with one, two and three vertical heat exchangers were compared. Their influences on the soil massif temperature in the heat exchangers area were shown. The mass flow and the temperature at the inlet and outlet side of the heat pump were measured in each circuit. Additional, the electricity consumption by the heat pump and energy supply to buffer vessel were measured. Finally, the Coefficient of Performance (COP) as a function of length of VGHE is shown for selected interval time.

scholarly journals Preliminary Results of the Temperature Distribution Measurements Around the Vertical Ground Heat Exchangers Tubes

2020 ◽  
Vol 27 (4) ◽  
pp. 509-528
Author(s):  
Joanna Piotrowska-Woroniak
Keyword(s):  
Temperature Distribution ◽  
Heat Pump ◽  
Cooling Capacity ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Water Type ◽  
Preliminary Results ◽  
Ground Heat Exchangers ◽  
Vertical Ground ◽  
The Way

Abstract The paper presents the preliminary results of the temperature distribution to a depth of 100 m in the two selected vertical geothermal wells during operation of the heat pump and ground temperature measurement without vertical ground probes work. Research was carried out from the third decade of December to the end of February. The wells are the lower energy source for two heat pumps brine/water type with heating power of 117.2 kW each and 95.9 kW cooling capacity installed in the building of The Faculty of Civil and Environmental Engineering, Bialystok University of Technology in Bialystok. With heat pumps work 52 vertical ground probes to a depth of 100 m each. The article presents the way of making probes equipped with 30 digital temperature sensors to record the temperature distribution in the vertical probes and in the ground and it shows the way of making the test bench using the groundwater wells with vertical probes. The average coefficient of performance COP of the heat pump HP in the months of January and February has been designated.

scholarly journals Heat pump systems: A mini review

2021 ◽  
Vol 4 (2) ◽  
pp. 73-81
Author(s):  
Mohammad Omar Temori ◽  
František Vranay
Keyword(s):  
Heat Pump ◽  
Electricity Consumption ◽  
Cost Savings ◽  
Electrical Energy ◽  
Primary Energy ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Heating And Cooling ◽  
Ground Source ◽  
Reduce Electricity Consumption

In this work, a mini review of heat pumps is presented. The work is intended to introduce a technology that can be used to income energy from the natural environment and thus reduce electricity consumption for heating and cooling. A heat pump is a mechanical device that transfers heat from one environmental compartment to another, typically against a temperature gradient (i.e. from cool to hot). In order to do this, an energy input is required: this may be mechanical, electrical or thermal energy. In most modern heat pumps, electrical energy powers a compressor, which drives a compression - expansion cycle of refrigerant fluid between two heat exchanges: a cold evaporator and a warm condenser. The efficiency or coefficient of performance (COP), of a heat pump is defined as the thermal output divided by the primary energy (electricity) input. The COP decreases as the temperature difference between the cool heat source and the warm heat sink increases. An efficient ground source heat pump (GSHP) may achieve a COP of around 4. Heat pumps are ideal for exploiting low-temperature environmental heat sources: the air, surface waters or the ground. They can deliver significant environmental (CO2) and cost savings.

scholarly journals THE OPTIMAL PARAMETERS TECHNIQUE FOR THE VERTICAL GROUND HEAT EXCHANGERS OF THE GEOTHERMAL HEAT PUMP SYSTEMS

2020 ◽  
Vol 8 (3) ◽  
pp. 113-124
Author(s):  
B. A. Semenov ◽  
◽  
D. S. Saponenko ◽  
Keyword(s):  
Heat Pump ◽  
Heat Exchangers ◽  
Net Present Value ◽  
Optimal Parameters ◽  
Present Value ◽  
Geothermal Heat ◽  
Ground Heat Exchangers ◽  
Geothermal Heat Pump ◽  
Vertical Ground

Представлена научно обоснованная методика определения оптимальных параметров вертикальных теплообменников грунтового контура геотермальной теплонасосоной установки по условию достижения максимума интегрального эффекта или чисто дисконтированного дохода (Net Present Value). Расчетами подтверждено, что максимальная экономическая эффективность вертикальных теплообменников грунтового контура может достигаться при соблюдении оптимальных значений двух определяющих параметров: общей длины U-образной тепловоспринимающей трубы и расхода проходящего по ней теплоносителя. Оптимальные значения этих параметров рассчитываются в зависимости от вида и температуры грунта, диаметра и марки полиэтиленовых труб, начальной температуры теплоносителя на входе, тарифов на теплоту и электроэнергию, удельных капитальных вложений во все элементы грунтового зонда, включая земляные работы, с учетом реальной нормы дисконта и ряда дополнительных исходных данных. Методика позволяет при различных климатических условиях и типах грунта определять оптимальные конструктивные и режимные параметры вертикальных грунтовых теплообменников и количественно оценивать максимально достижимую экономическую эффективность использования грунтовых контуров с вертикальными U-образными зондами для отбора низкопотенциальной теплоты грунта...

scholarly journals Implementation of a geothermal heat pump system in a solar passive house

2019 ◽  
Vol 85 ◽  
pp. 07014
Author(s):  
Gheorghe Ilisei ◽  
Tiberiu Catalina ◽  
Marian Alexandru ◽  
Robert Gavriliuc
Keyword(s):  
Heat Pump ◽  
Electricity Consumption ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Passive House ◽  
Geothermal Heat ◽  
Pump System ◽  
Heat Pump System ◽  
Major Index ◽  
Passive Houses

Underground energy sources are becoming increasingly popular and now geothermal heat pumps are frequently used to heat/cool different types of buildings, including for solar passive houses. This article aims at giving a contribution in the development of the thermal modelling of borehole heat storage systems, investigating the possibility of a GSHP (ground source heat pump) implementation with vertical boreholes in a solar passive house. A case study analysing a residential solar passive house is presented as a suitable modelling tool for the estimation of the thermal behaviour of GSHP systems by combining the outcome from different modelling programs. The software DesignBuilder, Earth Energy Designer and a sizing method for borehole’s length are used for producing the numerical results. The results highlight that the length of the borehole, a major index in estimating the system’s cost, is directly influenced by fundamental variables like thermal conductivity of grout or soil. Additionally, correlations between these parameters and the coefficient of performance of GSHP were made. Furthermore, the length of borehole is very important as it is responsible for almost half of the total installation cost and triggered a difference in electricity consumption of the GSHP up to 14%.

Soil Profile and Ground Properties Influence on Vertical Ground Heat Exchanger Efficiency

2017 ◽  
Author(s):  
Michał Chwieduk ◽  
Artur Rusowicz ◽  
Hanna Jędzrzejuk
Keyword(s):  
Heat Exchanger ◽  
Soil Profile ◽  
Heat Exchangers ◽  
Heat Pumps ◽  
Symmetric Model ◽  
Ground Heat Exchanger ◽  
Ground Heat Exchangers ◽  
Calculation Results ◽  
Vertical Ground ◽  
The Impact

Soil properties have a significant impact on the performance of ground heat exchangers. Exchangers cooperating with heat pumps are a reliable and efficient source of renewable energy. In the article concentric vertical ground heat exchanger is analysed, which is a common application cooperating with heat pumps. Soil and ground properties have great im-portance during sizing the system, i.e.: determining the length, configuration and deployment of ground heat exchangers. With the depth the soil/ground type and its properties can change significantly. In addition, occurrence of a ground water can influence physical and thermal properties. Determination of soil type present at different depths in a specific location is possible by performing a soil profile. The article presents an analysis of the impact of two soil profiles on the efficien-cy of the vertical ground heat exchanger. The analysis was performed based on the model of a single heat exchanger made using CFD (Computational Fluid Dynamics) program. The model is divided into two parts: model of heat ex-changer together with grout filling the borehole, second: axis-symmetric model of the ground surrounding the exchanger. Both models are coupled by first-type boundary condition. Simulations of ground heat exchanger work are made for a part of heating season period. The calculation results were compared to reference one with uniform ground profiles. Dif-ference in heat rejected form ground in two analysed does not show high influence of ground layers on ground heat ex-changer performance. On the other hand, results strongly depends on analysed soil profile.

The Influence of Outer Weather Conditions on the Modelling of Vertical Ground Heat Exchangers

2013 ◽  
Vol 361-363 ◽  
pp. 276-280
Author(s):  
Pascual Álvarez Gómez ◽  
Ismael Rodríguez Maestre ◽  
F. Javier González Gallero ◽  
J. Daniel Mena Baladés
Keyword(s):  
Heat Exchangers ◽  
Carbon Dioxide Emission ◽  
Weather Conditions ◽  
Heat Pumps ◽  
Weather Data ◽  
Fluid Temperature ◽  
Ground Heat Exchangers ◽  
Ansys Cfx ◽  
Vertical Ground ◽  
Surface Borehole

Policies for energy saving and carbon dioxide emission reduction have enouraged the use of efficient technologies in building thermal conditioning, like geothermal source heat pumps [. Most of the thermal models used to simulate the performance of vertical ground heat exchangers do not consider the effect of outer weather conditions, except for the setting of the initial ground temperature [. This paper shows a study to assess the effect of outer weather conditions on the outlet fluid temperature, especially during the upper part of the exchanger. Different depths for typical configurations of ground heat exchangers have been analysed. Detailed simulations have been developed for a full year of performance using a commercial finite volume computational fluid dynamics (CFD) code (©ANSYS-CFX). Outer weather conditions have been set by using synthetic hourly weather data and considering all of the heat transfer phenomena involved. Errors in outlet fluid temperature and surface borehole temperature have been estimated for the whole year of simulation.

Technical Note. Influence of Material Used for the Regenerator on the Properties of a Thermoacoustic Heat Pump

2013 ◽  
Vol 38 (4) ◽  
pp. 565-570 ◽  
Author(s):  
Bartłomiej Kruk
Keyword(s):  
Heat Transfer ◽  
Temperature Gradient ◽  
Acoustic Wave ◽  
Heat Pump ◽  
Sound Wave ◽  
Heat Exchangers ◽  
Heat Pumps ◽  
Technical Note ◽  
New Materials ◽  
Modern Technologies

Abstract Research in termoacoustics began with the observation of the heat transfer between gas and solids. Using this interaction the intense sound wave could be applied to create engines and heat pumps. The most important part of thermoacoustic devices is a regenerator, where press of conversion of sound energy into thermal or vice versa takes place. In a heat pump the acoustic wave produces the temperature difference at the two ends of the regenerator. The aim of the paper is to find the influence of the material used for the construction of a regenerator on the properties of a thermoacoustic heat pump. Modern technologies allow us to create new materials with physical properties necessary to increase the temperature gradient on the heat exchangers. The aim of this paper is to create a regenerator which strongly improves the efficiency of the heat pump.

scholarly journals Heat Pump Bridge Analysis Using the Modified Energy Transfer Diagram

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 137
Author(s):  
Florian Schlosser ◽  
Heinrich Wiebe ◽  
Timothy G. Walmsley ◽  
Martin J. Atkins ◽  
Michael R. W. Walmsley ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Heat Pump ◽  
Heat Recovery ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Combined Application ◽  
Recovery Potential ◽  
Composite Curve ◽  
And Performance ◽  
The Individual

Heat pumps are the key technology to decarbonise thermal processes by upgrading industrial surplus heat using renewable electricity. Existing insight-based integration methods refer to the idealised Grand Composite Curve requiring the full exploitation of heat recovery potential but leave the question of how to deal with technical or economic limitations unanswered. In this work, a novel Heat Pump Bridge Analysis (HPBA) is introduced for practically targeting technical and economic heat pump potential by applying Coefficient of Performance curves into the Modified Energy Transfer Diagram (METD). Removing cross-Pinch violations and operating heat exchangers at minimum approach temperatures by combined application of Bridge Analysis increases the heat recovery rate and reduce the temperature lift to be pumped at the same time. The insight-based METD allows the individual matching of heat surpluses and deficits of individual streams with the capabilities and performance of different market-available heat pump concepts. For an illustrative example, the presented modifications based on HPBA increase the economically viable share of the technical heat pump potential from 61% to 79%.

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