scholarly journals Residential Ground Source Heat Pumps with Integrated Domestic Hot Water Generation: Performance Results from Long-Term Monitoring

2012 ◽  
Author(s):  
D. Stecher ◽  
K. Allison
Keyword(s):  
Heat Pumps ◽  
Hot Water ◽  
Ground Source Heat Pumps ◽  
Domestic Hot Water ◽  
Ground Source ◽  
Long Term Monitoring ◽  
Performance Results ◽  
Term Monitoring

scholarly journals Experimental Study and Modeling of Ground-Source Heat Pumps with Combi-Storage in Buildings

2018 ◽  
Author(s):  
Wessam El-Baz ◽  
Peter Tzscheutschler ◽  
Ulrich Wagner
Keyword(s):  
Heat Pump ◽  
Water Consumption ◽  
Residential Buildings ◽  
Heat Pumps ◽  
Hot Water ◽  
Space Heating ◽  
Ground Source Heat Pumps ◽  
Domestic Hot Water ◽  
Ground Source ◽  
And Control

There is a continuous growth of heat pump installations in residential buildings in Germany. The heat pumps were not only used for space heating and domestic hot water consumption but also to offer flexibility to the grid. the high coefficient of performance and the low cost of heat storages made the heat pumps an optimal candidate for the power to heat applications. Thus, several questions are raised about the optimal integration and control of the heat pump system with buffer storages to maximize its operation efficiency and minimize the operation costs. In this paper, an experimental investigation is performed to study the performance of a ground source heat pump (GSHP) with a combi-storage under several configurations and control factors. The experiments were performed on an innovative modular testbed that is capable of emulating a ground source to provide the heat pump with different temperature levels at different times of the day. Moreover, it can emulate the different building loads such as the space heating load and the domestic hot water consumption in real-time. The data gathered from the testbed and different experimental studies were used to develop a simulation model based on Modelica that can accurately simulate the dynamics of a GSHP in a building. The model was validated based on different metrics. Energetically, the difference between the developed model and the measured values was only 3.08\% and 4.18\% for the heat generation and electricity consumption, respectively.

Long-Term Monitoring of the Effectiveness of a Ground Source Heat Pump Borehole

2014 ◽  
Vol 1041 ◽  
pp. 125-128
Author(s):  
Olga Rubinová ◽  
Iva Ambrožová ◽  
Petr Horák
Keyword(s):  
Substrate Temperature ◽  
Heat Pump ◽  
Ground Source Heat Pump ◽  
Not Given ◽  
Ground Source ◽  
Early Results ◽  
Long Term Monitoring ◽  
Term Monitoring ◽  
Over Time

In this study, we evaluate the qualitative thermal performance of a groundwater borehole by monitoring the temperature at the primary (borehole) and secondary (heat pump) sides of a domestic heat pump over three heating seasons between 2010 and 2013. Based on early results, the borehole was extended during the monitoring period in order to increase performance. Our results suggest that the temperature parameters of a borehole do not remain constant and that a borehole’s properties can change significantly over time if the borehole substrate temperature is not given time to regenerate.

scholarly journals Clean Energy for Cooling and Heating with Ground Source Heat Pumps

2019 ◽  
Vol 3 (2) ◽  
Keyword(s):  
Renewable Energy ◽  
Alternative Energy ◽  
Renewable Energy Sources ◽  
Clean Energy ◽  
Heat Pumps ◽  
Hot Water ◽  
Energy Sources ◽  
Ground Source Heat Pumps ◽  
Heating And Cooling ◽  
Ground Source

In the recent attempts to stimulate alternative energy sources for heating and cooling of buildings, emphasise has been put on utilisation of the ambient energy from ground source heat pump systems (GSHPs) and other renewable energy sources. Exploitation of renewable energy sources and particularly ground heat in buildings can significantly contribute towards reducing dependency on fossil fuels. The study was carried out at the Energy Research Institute (ERI), between September 2016 and November 2017. This paper highlights the potential energy saving that could be achieved through use of ground energy source. The main concept of this technology is that it uses the lower temperature of the ground (approximately <32°C), which remains relatively stable throughout the year, to provide space heating, cooling and domestic hot water inside the building area. The purpose of this study, however, is to examine the means of reducing of energy consumption in buildings, identifying GSHPs as an environmental friendly technology able to provide efficient utilisation of energy in the buildings sector, promoting the use of GSHPs applications as an optimum means of heating and cooling, and presenting typical applications and recent advances of the DX GSHPs. It is concluded that the direct expansion of GSHP are extendable to more comprehensive applications combined with the ground heat exchanger in foundation piles and the seasonal thermal energy storage from solar thermal collectors. This study highlights the energy problem and the possible saving that can be achieved through the use of the GSHP systems. This article discusses the principle of the ground source energy, varieties of GSHPs, and various developments.

scholarly journals Characterization of the Effects of Borehole Configuration and Interference with Long Term Ground Temperature Modelling of Ground Source Heat Pumps

2021 ◽  
Author(s):  
Ying Lam E. Law ◽  
Seth B. Dworkin
Keyword(s):  
Fast Food ◽  
High Efficiency ◽  
Separation Distance ◽  
Heat Pumps ◽  
Ground Temperature ◽  
Conventional Heating ◽  
Ground Source Heat Pumps ◽  
Heating And Cooling ◽  
Ground Source

Ground source heat pumps (GSHPs) are an environmentally friendly alternative to conventional heating and cooling systems because of their high efficiency and low greenhouse gas emissions. The ground acts as a heat sink/source for the excess/required heat inside a building for cooling and heating modes, respectively. However, imbalance in heating and cooling needs can change ground temperature over the operating duration. This increase/decrease in ground temperature lowers system efficiency and causes the ground to foul—failing to accept or provide more heat. In order to ensure that GSHPs can operate to their designed conditions, thermal modelling is required to simulate the ground temperature during system operation. In addition, the borehole field layout can have a major impact on ground temperature. In this study, four buildings were studied—a hospital, fast-food restaurant, residence, and school, each with varying borehole configurations. Boreholes were modeled in a soil volume using finite-element methods and heating and cooling fluxes were applied to the borehole walls to simulate the GSHP operation. 20 years of operation were modelled for each building for 2x2, 4x4, and 2x8 borehole configurations. Results indicate that the borehole separation distance of 6 m, recommended by ASHRAE, is not always sufficient to prevent borehole thermal interactions. Benefits of using a 2x8 configuration as opposed to a 4x4 configuration, which can be observed because of the larger perimeter it provides for heat to dissipate to surrounding soil were quantified. This study indicates that it is important to carefully consider ground temperature during the operation of a GSHP. Borehole separation distances, layout, and hybridization should be studied to alleviate ground fouling problems.

Analysis of the Heat Pump Market in Europe with a Special Regard to France, Spain, Poland and Lithuania

2021 ◽  
Vol 25 (1) ◽  
pp. 840-852
Author(s):  
Agata Witkowska ◽  
Dorota Anna Krawczyk ◽  
Antonio Rodero
Keyword(s):  
Heat Pump ◽  
Energy Efficient ◽  
Heat Pumps ◽  
Hot Water ◽  
Ground Source Heat Pumps ◽  
Key Technology ◽  
Technological Factors ◽  
Special Regard ◽  
Ground Source ◽  
Social Environmental

Abstract Becoming the world’s first climate-neutral continent by 2050 is currently the most ambitious European goal. Heat pumps are the example of the key technology, which could help to achieve the aim by heating, cooling and domestic hot water (DHW) preparation in an ecological and energy-efficient way. This article characterized a heat pump market in Europe between 2009 and 2020 with a special regard to France, Spain, Poland and Lithuania, for which a more detailed study was presented. The analysis was performed primarily on the grounds of statistics data provided by the European Heat Pump Association (EHPA), which determined the number of heat pumps sold based on standard questionnaires from national heat pump associations, statistical offices and research institutes. The highest number of heat pump sold in analysed period of time was recorded in France, Italy, Sweden, Norway, Germany and Spain. Poland was in the middle of the list, while Lithuania was one of the last countries. Considering the number of heat pumps sold per 1000 households, Norway was the clear leader, followed by Estonia, Finland, Sweden and Denmark. Lithuania was placed 12th, while Poland was only 18th. In terms of the type of lower and upper heat source, air-to-water and air-to-air heat pumps were the most popular choices, while ground source heat pumps were the least popular. The development of the heat pump market has been influenced by social, environmental, economic and technological factors.

scholarly journals Measurement and Verification of Integrated Ground Source Heat Pumps on a Shared Ground Loop

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1752 ◽  
Author(s):  
Jeong Soo Shin ◽  
Jong Woo Park ◽  
Sean Hay Kim
Keyword(s):  
Heat Pump ◽  
Air Conditioning ◽  
Heat Pumps ◽  
Hot Water ◽  
Geothermal System ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Ground Source Heat Pumps ◽  
Water Service ◽  
Ground Source

We propose an integrated geothermal system that consists of air-conditioning and hot water service ground source heat pumps, both of which share a ground water loop. The proposed system increases the COP of the service hot water ground source heat pump by recovering the condensation heat of the air-conditioning ground source heat pump as an evaporator heat source for the hot water service ground source heat pump. Eventually this integration expands the scope and capacity of the evaporator source in addition to the underground water of heat exchangers, which also leads to increase the COP of the air-conditioning ground source heat pump. The integrated geothermal heat pump system was installed in a hotel, and then data were measured for a limited period due to the hotel’s ongoing business activities. A TRNSYS simulation model has been developed as a baseline, and the baseline has been calibrated with the measured data. By running one-year simulations, it turns out that the annual electricity use for heating and cooling, and service hot water was reduced by 19.1% in the cooling season, and by 9.6% in the heating season, with respect to the conventional configuration in which the air-conditioning heat pump and hot water service heat pump work individually on their own ground loops.

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