scholarly journals Technico-economic modelling of ground and air source heat pumps in a hot and dry climate

2020 ◽  
pp. 095765092097605
Author(s):  
Faisal Alshehri ◽  
Stephen Beck ◽  
Derek Ingham ◽  
Lin Ma ◽  
Mohammed Pourkashanian
Keyword(s):  
Saudi Arabia ◽  
Air Conditioning ◽  
Heat Pumps ◽  
Climatic Conditions ◽  
High Rate ◽  
Coefficient Of Performance ◽  
Economic Modelling ◽  
Current Standard ◽  
Ground Source Heat Pumps ◽  
Ground Loop

In a hot and dry country such as Saudi Arabia, air-conditioning systems consume seventy per cent of the electrical energy. In order to reduce this demand, conventional air -conditioning technology should be replaced by more efficient renewable energy systems. These should be compared to the current standard systems which use air source heat pumps (ASHPs). These have a poor performance when the air temperature is high. In Saudi Arabia, this can be as much as 50 °C. The purpose of this work, therefore, is to simulate and evaluate the performance of ground source heat pumps (GSHPs) compared with systems employing (ASHPs). For the first time, both systems were comprehensively modelled and simulated using the Transient System Simulation (TRNSYS). In addition, the Ground Loop Design (GLD) software was used to design the length of the ground loop heat exchanger. In order to assess this configuration, an evaluation of a model of a single story office building, based on the climatic conditions and geological characteristics that occur in the city of Riyadh in Saudi Arabia was investigated. The period of evaluation was twenty years in order to determine the Coefficient of Performance (COP), Energy Efficiency Ratio (EER) and power consumption. The simulation results show that the GSHP system has a high performance when compared to ASHP. The average annual COP and EER were 4.1 and 15.5 for the GSHP compared to 3.8 and 11 for the ASHP respectively, and the GSHP is a feasible alternative to ASHP with an 11 years payback period with an 18% total cost saving over the simulation period and 36% lower annual energy consumption. The TRNSYS model shows that despite the positive results of the modeling, the high rate of the underground thermal imbalance (88%) could lead to a system failure in the long term

scholarly journals Two software tools for facilitating the choice of ground source heat pumps by stakeholders and designers

2019 ◽  
Vol 111 ◽  
pp. 06023 ◽  
Author(s):  
Michele De Carli ◽  
Amaia Castelruiz Aguirre ◽  
Angelo Zarrella ◽  
Lucia Cardoso ◽  
Sarah Noyé ◽  
...  
Keyword(s):  
Decision Making ◽  
Energy Demand ◽  
Optimal Solution ◽  
Heat Pumps ◽  
Climatic Conditions ◽  
Design Tool ◽  
Detailed Calculation ◽  
Ground Source Heat Pumps ◽  
Ground Source ◽  
Support Decision Making

For promoting the diffusion of GSHP and making the technology more accessible to the general public, in the H2020 research project “CHeap and Efficient APplication of reliable Ground Source Heat exchangers and PumpS” (acronym Cheap-GSHPs) a tool for sizing these systems has been developed, as well as a Decision Support System (DSS) able to assist the user in the preliminary design of the most suitable configuration. For all these tools a common platform has been carried out considering climatic conditions, energy demand of buildings, ground thermal properties, heat pump solutions repository, as well as renewable energy database to use in synergy with the GSHPs. Since the aims of the tools are different, there are different approaches. The design tool is mainly addressed to designers. The calculation may be done in two ways: with a simplified method based on the ASHRAE approach and with a detailed calculation based on the numerical tool CaRM (Capacity-Resistance method). The DSS final aim is to support decision-making, by providing the stakeholders at all the level with a series of scenario. The Cheap-GSHPs project has developed a DSS tool aimed at accelerating the decision-making process of designers and building owners as well as increasing market share of the Cheap-GSHPs technologies. Hence the DSS generates different possible solutions based on a defined general problem, identifying the optimal solution. Both tools are presented in the paper, showing the potentialities provided by both software.

scholarly journals Seasonal coefficient of performance of air-to-air heat pump and energy performance of a building in Poland

2019 ◽  
Vol 116 ◽  
pp. 00039 ◽  
Author(s):  
Piotr Kowalski ◽  
Paweł Szałański
Keyword(s):  
Heat Pump ◽  
Energy Performance ◽  
Heat Pumps ◽  
Climatic Conditions ◽  
Coefficient Of Performance ◽  
Climatic Data ◽  
Heating Season ◽  
Season Length ◽  
Local Climate ◽  
Significant Difference

The article discusses the problem of determining for air heat pumps the seasonal efficiency of energy production necessary to determine the energy performance of a building. On the example of selected Polish cities (Suwalki, Bialystok, Warsaw, Wroclaw, Zielona Gora, Resko, Szczecinek, Koszalin) the influence of climatic conditions on the SCOP of an exemplary air-to-air heat pump and on the result of building energy performance calculations was analysed. SCOPs for each location were determined according to the method of EN 14825. The difference between SCOP for average (A) and colder (C) climates according to EN 14825 was 35.6%. It has been shown that the climate of Polish cities may be similar to both the average climate (A) and the colder climate (C), or they significantly differ from both climates. The most significant difference in SCOP between the analysed cities was obtained for Suwalki and Szczecinek. It was 31.9% and 31.4% for the assumed heating season length as for climate (A) and (C) respectively. For the exemplary building in Suwalki, taking SCOP for the average climate (A) and not based on climatic data of Suwalki gives an error of 39.3% in the calculation of primary energy for heating. For the same locations, the differences in SCOP and EP resulting from the assumption of the heating season length as for the average climate (A) or as for the colder climate (C) were respectively from 2.4% to 3.3% and from -3.4% to -2.2%. In diversified Polish climate, assuming the same SCOP values of air heat pumps regardless of location does not allow for their full comparison with devices whose efficiency does not depend on climatic conditions. The authors suggest that when calculating the energy performance of the building, the SCOP should be always determined on the basis of the local climate and the length of the heating season.

scholarly journals A European Database of Building Energy Profiles to Support the Design of Ground Source Heat Pumps

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2496 ◽  
Author(s):  
Laura Carnieletto ◽  
Borja Badenes ◽  
Marco Belliardi ◽  
Adriana Bernardi ◽  
Samantha Graci ◽  
...  
Keyword(s):  
Heat Pump ◽  
Energy Demand ◽  
Residential Buildings ◽  
Building Energy ◽  
Heat Pumps ◽  
Climatic Conditions ◽  
Ground Source Heat Pumps ◽  
Heating And Cooling ◽  
Energy Profiles ◽  
Ground Source

The design of ground source heat pumps is a fundamental step to ensure the high energy efficiency of heat pump systems throughout their operating years. To enhance the diffusion of ground source heat pump systems, two different tools are developed in the H2020 research project named, “Cheap GSHPs”: A design tool and a decision support system. In both cases, the energy demand of the buildings may not be calculated by the user. The main input data, to evaluate the size of the borehole heat exchangers, is the building energy demand. This paper presents a methodology to correlate energy demand, building typologies, and climatic conditions for different types of residential buildings. Rather than envelope properties, three insulation levels have been considered in different climatic conditions to set up a database of energy profiles. Analyzing European climatic test reference years, 23 locations have been considered. For each location, the overall energy and the mean hourly monthly energy profiles for heating and cooling have been calculated. Pre-calculated profiles are needed to size generation systems and, in particular, ground source heat pumps. For this reason, correlations based on the degree days for heating and cooling demand have been found in order to generalize the results for different buildings. These correlations depend on the Köppen–Geiger climate scale.

scholarly journals Total carbon dioxide emissions from ground source heat pump and groundwater one in Białystok

2019 ◽  
Vol 116 ◽  
pp. 00023
Author(s):  
Andrzej Gajewski
Keyword(s):  
Heat Pump ◽  
Carbon Dioxide Emissions ◽  
Energy Production ◽  
Electrical Energy ◽  
Heat Pumps ◽  
Climatic Conditions ◽  
Total Carbon ◽  
Coefficient Of Performance ◽  
Low Efficiency ◽  
Electrical Energy Production

To limit greenhouse gases emissions caused by energy production European Union (EU) prompts heat pump as heat generator which should decrease CO2 emissions to the atmosphere. Because of the climatic conditions and low efficiency of electrical energy production and transfer in Poland it could be possible a condensing gas boiler would emit less CO2. The analysis includes ten-year temperature measurements in Białystok where is more severe climate in Poland. Due to relatively high seasonal coefficient of performance (SCOP) value heat pumps can emit less CO2 than condensing gas boiler and can be applied as ecological heat generators.

scholarly journals Analysis of ground thermal potential reduction and thermal interaction between boreholes during operation of ground source heat pump in Moscow city environments

2021 ◽  
Vol 289 ◽  
pp. 02006
Author(s):  
Elizaveta Tyabut ◽  
Ivan Sokolov ◽  
Artem Ryzhenkov
Keyword(s):  
Heat Pump ◽  
Mutual Influence ◽  
Energy Resource ◽  
Heat Pumps ◽  
Geothermal Field ◽  
Climatic Conditions ◽  
Ground Source Heat Pumps ◽  
Promising Alternative ◽  
Ground Source ◽  
Moscow City

Geothermal energy is a renewable energy resource. Nowadays it can be considered as a promising alternative to various fossil fuels. Ground source heat pumps are efficient installations enabling the intensive use of underground energy for heating and cooling of modern residential and commercial buildings. However, climatic conditions often limit the use of this type of installation to a certain extent. This paper presents a description of an existing system comprising a liquid-toliquid heat pump and a geothermal field consisting of 4 boreholes. The system is used to investigate the intensity of ground temperature potential decrease in winter and its recovery in summer in the Moscow city environment with a detailed study of the properties of individual soil layers, as well as to study the mutual influence of boreholes on each other, represented by the conditional radius of thermal influence of individual boreholes. Graphs of soil temperature changes at different depths are presented.

Dynamic Simulation of Organic Rankine Cycle-Assisted Ground-Source Heat Pump Based Micro-Cogeneration System in Cold Climates: A Case Study in Canada

2021 ◽  
Author(s):  
Wahiba Yaïci ◽  
Evgueniy Entchev ◽  
Michela Longo
Keyword(s):  
Storage Temperature ◽  
Organic Rankine Cycle ◽  
Heat Pumps ◽  
Coefficient Of Performance ◽  
Net Energy ◽  
Combined System ◽  
Ground Source Heat Pumps ◽  
Heating And Cooling ◽  
Ground Source ◽  
Cogeneration System

Abstract As the energy needed for heating and cooling involves a substantial amount (> 80%) of residential energy utilisation in Canada, there is a demand for ultra-efficient energy systems for heating, cooling, and power generation. Two efficient systems to assist these systems are ground-source heat pumps (GSHPs) and organic Rankine cycles (ORCs). Of particular interest, this paper presents the integration of these two systems in a parallel configuration. A transient simulation model developed in TRNSYS program has been utilised to simulate the thermal performance of the combined ORC-GSHP based microco/trigeneration system. This later supplies heating and cooling to the residential load during the heating mode as required, with the capability to switch to a charging mode, where the ORC unit is directly coupled to the ground heat exchanger (GHE), which operates as a thermal energy storage and provides energy to the GSHP. The feasibility of this combined system configuration as well as its comparison with a conventional GSHP system are investigated for use in residential application in Ottawa, Canada temperature conditions. Results disclosed that the proposed micro-cogeneration system had the operating hours and performance of the GSHP improved by the addition of the ORC unit, resulting in about 11.8% reduction in hours in the colder city of Ottawa. The COP (coefficient of performance) of the GSHP system sustained a much higher value overall due to the addition of the ORC system to maintain the GHE storage temperature. In terms of net energy reduction between the conventional GSHP system and the ORC-assisted one, results revealed that Ottawa had energy usage reduction of 82.0%, demonstrating that the addition of an ORC to provide heating and recharge the GHE of a GSHP system has many advantages that could be accomplished by the end-user.

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.

Research on the Application of Green Air Conditioning in the Granary

2013 ◽  
Vol 477-478 ◽  
pp. 400-403
Author(s):  
Yu Hui Di ◽  
Chun Yang Jiang ◽  
Zi Long Xu
Keyword(s):  
Low Temperature ◽  
Air Conditioning ◽  
Heat Pumps ◽  
Food Storage ◽  
Ground Source Heat Pumps ◽  
Air Conditioning System ◽  
Solar Cooling ◽  
Ground Source ◽  
Environmental Requirements ◽  
Future Direction

By describing the environmental requirements for food storage, puts forward the green air conditioning system to create a low-temperature environment for food of these creatures such as ice storage air-conditioning, ground source heat pumps, solar cooling and so on. Combined the related system diagram or schematic in the context of promoting green and healthy, pointed out the future direction of development of the low-temperature grain storage.

Resolving National Energy Crisis through Energy Efficient Appliances: Use of Ground Water Heat Pump for Air Conditioning Systems

2014 ◽  
Vol 983 ◽  
pp. 261-264
Author(s):  
Ahmad Aizaz ◽  
Nauman Hafeez
Keyword(s):  
Ground Water ◽  
Air Conditioning ◽  
Electricity Consumption ◽  
Heat Pumps ◽  
Temperature Data ◽  
Coefficient Of Performance ◽  
Energy Crisis ◽  
Air Conditioner ◽  
Water Temperature Data ◽  
Air Conditioning Systems

Energy crisis are deepening with every year passing by in a country like Pakistan. One of the major contributors of energy consumption in the domestic as well as in some commercial sector is the environment air conditioning (during summers) and heating systems (during winters). One possible solution to this national energy crisis is available in the form of tapping the available renewable natural resources of energy, specifically the Ground Water Heat Pumps (GWHP). Despite its wider applications in the advanced countries, the confidence in this technology is much feeble in less advanced countries, like Pakistan, mainly due to lack of awareness about the technology among the public and lack of subsoil temperature data for the scientific / engineering community. Thus, the aim of this study is to collect subsoil water temperature data of at least one particular location for over a year, and demonstrate the usefulness of sub soil ground water in improving the performance of conventional air-conditioning system both in cooling as well as in heating modes. This study shows significant improvement in the Coefficient of Performance (COP) of the Air Conditioner both in Cooling as well as in heating modes and thus reducing the expensive electricity consumption.

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