The following guide will help you understand the differences and determine which is. A general introduction on the gshps and its development, and a description of the surface water swhp, groundwater gwhp, and groundcoupled heat pumps are briefly performed. Gs2000 is a software program released in 1995 for the sizing of ground source heat pump ground heat exchangers also known as earth energy systems, geothermal heat pumps, and geoexchange systems morrison, 1997. These allinone forcedair or watertoair systems can provide comfort to your home more efficiently than any other type of ordinary system. Simulation of ground source heat pump systems building. Simulation and analysis of airground dual source heat. Lake water, ground surface or ground water aquifer storages can be used as heat source as well as vertical boreholes with heat exchangers, which the latter is the scope of this study.
The simulation result of the cop, the heat source and outlet temperature variation, and the energy consumption are analyzed for these two systems. If building air is blown through the heat exchanger for heat recovery ventilation, they are called earth tubes also. Heat pumps provide extremely efficient levels of indoor heating and cooling at a very economical price. Geo2d twodimensional computer model of a ground source. Ground loop heat exchanger design software building. Hybrid ground source heat pump system simulation using. This chapter mainly presents a detailed theoretical study and experimental investigations of groundsource heat pump gshp technology, concentrating on the groundcoupled heat pump gchp systems. A ground source heat pump gshp project was established using the transient system simulation program trnsys based on a ground heat exchange theoretical model, which was validated by a previously established. Hap is designed for consulting engineers, designbuild contractors, hvac contractors, facility engineers and other professionals involved in the design and analysis of commercial building hvac systems.
Hybrid ground source heat pump systems incorporate both. A european database of building energy profiles to support the design of ground source heat pumps. Energies free fulltext an integrated hbim simulation. Control strategies can also be applied to keep the ground. Ground source heat pump also referred to as geothermal heat pump gshp systems provide space heating and cooling, and, in some cases, hot water for residential and commercial buildings.
Custom gfunctions are generated using a finite line source model. Another significant aspect analyzed in this thesis is the uncertainty of input. Using groundsource heat pump systems for heatingcooling. Hygchp is a software module that can help you analyze this option. The technology uses an indoor heat pump unit and a heat exchanging ground loop buried underground or underwater to transfer thermal energy between and. Ground source geothermal energy gss integrated energy. Geo2d performs a detailed finite difference simulation of the heat transfer occurring within the working fluid, the tube wall, the grout, and the ground. Ashrae 2008 completed a research project that examined hybrid ground source heat pump systems, but. Field test of horizontal ground heat exchangers installed.
They use the earths near constant subterranean temperature to warm or cool air or other fluids for residential, agricultural or industrial uses. Geothermal heating and cooling solutions are prized for their efficiency. The fluid is then rewarmed as it flows through the ground. This file contains a zipped file that contains many files required to run geo2d. This mean that for 1 w of electric energy heat pump transfer from the ground 3 w of geothermal additional energy which if we neglect loses is equal to the 4 w of thermal energy. Gld software windowsbased revolutionary geothermal hvac. Pdf modeling ground source heat pump systems in a building. Modeling ground source heat pump systems and equipment in. A groundcoupled heat exchanger is an underground heat exchanger that can capture heat from andor dissipate heat to the ground. Numerical simulation modeling of a gshp and wshp system. A geothermal heat pump system takes advantage of this ground temperature, providing free, renewable energy for heating, cooling and domestic hot water.
Ground source heat pumps are one of the fastest growing applications of renewable energy in the world, with annual increase of 10% in 30 countries over 15 years. This study develops a groundcoupled heat pump gchp simulation model for a residential codecompliant simulation tool. Ground source heat pump performance in case of high humidity soil and yearly balanced heat transfer. In addition, the residential airsource heat pump ashp simulation model i. By importing the meteorological data of water temperatures to trnsys software, temperature differential control method was applied to simulate hybrid ground source heat pump system for three months in wuhan. Example of a system configuration for a hybrid geothermal heat pump application. The thermal state of the ground is determined by prior heat additionextractions rates and durations. The source of heat used for ground source heat pumps is the sun, as it heats up the ground water resulting in the stable temperature of the earths floor. Current version of energyplus can model both gshp and airsource vrf. Modeling a ground source heat pump turbomachinery blog. Ground source heat pump systems gshps can be divided in different categories depending on the design and heat source. Modeling, simulation and optimization of ground source heat pump systems by muhammad haider khan bachelor of science in mechanical engineering university of engineering and technology lahore, pakistan 2000 submitted to the faculty of the graduate college of the oklahoma state university in partial fulfillment of. It was found that the storage capacity and the plate heat exchangers effectiveness, contributed the most to the heat productivity of. Ground source heat pumps use the earth as a thermal reservoir to provide conditioned air for heating and cooling of buildings.
Designing and optimizing heat storage of a solarassisted. The outcome of the research could provide the valuable reference for local geothermal heat pump system design as well as for other cities in the hot summer and cold winter region of china. Simulation of hybrid solargeothermal heat pump systems. The program is a powerful tool for designing systems and sizing system components as well as modeling annual energy performance and energy costs. Trnsys and energyplus welltested fullbuilding simulation software packages have the capability to complete detailed subhourly models of hybrid groundsource heat pumps systems. The ground source heat pump gshp and variable refrigerant. Numerical simulation of ground source heat pump system. This paper presents the design and optimization of a solarassisted storage system to solve this issue. In order to obtain running effect of this system, the inlet and outlet water temperatures of heat pump and buried pipe, as well as the soil temperature.
A conventional groundsource heat pump system has the same primary energy consumption, while the heat pumps capacity is double and the ground heat exchanger 2. If you are interested in using this coupling of gaia geothermal and the ies ve, be sure to check. We do everything from the drilling of the boreholes to the heat pump installation and installation of underfloor heating if required. It can also size horizontal ground heat exchangers both straight and slinky type heat exchangers.
The cold accumulation problem can lead to performance degradation of heat pumps. Ground source heat pumps nicholls boreholes supplies, installs and maintains ground source heat pumps gshps. The heat exchanger may be composed of any number of boreholes arranged in various configurations. Basic design considerations for geothermal heat pump.
Geothermal heating and cooling solutions are prized for their. Tools to design and support your ground source heat pump installation. Simulation and optimization of a hybrid unglazed solar. The fact that ground source heat pumps work by extracting solar energy stored in the ground means they can be installed virtually anywhere. Hourly analysis program carrier carrier commercial north. Gld is the leading software suite for geothermal heat pump and ground heat exchanger system design. The aim of this survey is to explore different simulation software for designing of ground source heating systems. For every unit of electricity used to pump the heat, 34 units of heat can be produced. Glhepro best directory building energy software tools. Simulation for up to 100 years of ground loop heat exchangers to determine monthly average and peak heat pump entering and exiting fluid temperatures, as well as power consumption of the heat pump. The capacity of the ground to absorb or provide heat is a transient heat transfer problem. To achieve this, this study proposed the gfunction approximation method using polynomial curvefitting equations. The trnsys simulation program has been used to model one of the hottest technologies in the hvac market today. Based on the simulation study of airground dual heat source heat pump system in the actual project of an office building in shenyang, this paper compares and analyzes the operating efficiency of dual heat source heat pump system and single heat source heat pump system in summer and winter.
Ground source heat pumps can pump heat from the ground into a building to provide space heating and domestic hot water. A widely used type of geothermal heat pump system is either a ground source or a water source heat pump. In ground source heat pump system, heat is extracted from the fluid in the ground connection by a geothermal heat pump and distributed to the building. The ratio of heat provided to electricity consumed over the heating season depends not only on the efficiency of the heat pump itself, but also the properties of the building, the heat distribution. A geothermal heat pump ghp or ground source heat pump gshp is a central heating andor cooling system that transfers heat to or from the ground it uses the earth all the time, without any intermittency, as a heat source in the winter or a heat sink in the summer. A well designed ground source heat pump installation can provide four or five kilowatts of heat for the consumption of one kilowatt of electricity. The hot summer and cold winter region is the most urbanized region of china and has subtropical monsoon climate, therefore, heating, ventilation, and air conditioning. Geo2d is a user friendly program that uses a graphical user interface for.
Models of vertical ground loop heat exchanges and watertowater heat pumps have been implemented in the energyplus program. This easy rss heat pump design is used for the sizing and specification of both air and ground source heat pump systems. This paper studies the longterm performance of a ground source heat pump gshp system and a water source heat pump wshp system for an office building in suzhou, which is a hot summer and cold winter climate region of china. By simultaneous fully coupled simulation the borehole field, plant as well as the building, it is possible to take realistic account of heat pump capacity and cop dependence on borehole return temperature. Simulation of the thermal performance of a hybrid solar.
Lifecycle cost study of a geothermal heat pump system. Trnsys simulation of hybrid ground source heat pump system. This design takes advantage of the moderate temperatures in the ground to boost efficiency and reduce the operational. The conventional hvac systems chosen for comparison to the ghp system were. Software for modelling and simulation of ground source. Heat pumps for primary source of energy uses thermal energy from air, soil or ground water. The typical ground source heat pump system is generally made up of four basic components the ground loop which collects heat from the ground, the heat pump which raises the heat to an appropriate. This study is based on a literature survey of and models for software. In particular, there can be a postcode lottery element to vertical arrays, as the cost of borehole digging varies enormously around the country.
This work also highlights the contribution of simulation tools to the design of complex heating. A hybrid geothermal heat pump system can lower your costs by reducing the peak capacity. Simulation for up to 100 years of ground loop heat exchangers to determine monthly. The apachehvac boiler and chiller components are a placeholder that will simply record loads for the gshp, groundsource loops and pumps, geoexchange bore fields, backup heating and cooling equipment boiler and cooling tower, and timeofuse tou demandbased heat pump controls that can be modelled in gld 2010.
It is sold by the international ground source heat pump association. The most reliable source is the soil and groundwater due to their. Models to simulate borehole storages, heat pumps, and system components like water storages, hydraulics and building loads are explored. Roof top units with gas heat and direct expansion dx cooling aircooled condensers, and airsource heat pump units these conventional system selections were made for two main reasons.
The main benefit of hybrid geothermal heat pump systems relative to nonhybrid systems is the significantly reduced initial size and cost of the ghx. Small unit versus large unit many times during heat pump selection you will have a heat loss of a house that is between a smaller unit 3 or 4ton and a larger unit 6ton and youll need to make a decision between installing a small unit that will need to use electric heat at times but will have a smaller and cheaper loop field or a larger unit that will be able to produce plenty of. Ground loop design 2010 or glhepro can be used to test out the viability of some hybrid designs its hybrid functionality is relatively basic. Geo2d is a computer code for simulating ground source heat pump gshp systems in. Ground source heat pump, simulation, horizontal directional drilling, thermal response test abstract in ground source heat pump gshp systems, the drilling cost of ground heat exchangers ghes needs to be minimized for the dissemination of the systems.
For several years, we have been developing models for ground loop heat exchangers, heat pumps, and other related components. Does the program generate a thermal storage report for my gshp. Geo2d performs a detailed finite difference simulation of the heat transfer. What does the thermal storage represent when modeling a ground source. Simulation and design of ground source heat pump systems journal of shandong university of architecture and engineering. Design of the groundcoupling sizing of the groundcoupling for a heat pump is different than sizing conventional equipment. Geo2d is a computer code for simulating ground source heat pump gshp systems in twodimensions. Trnsys and energyplus welltested fullbuilding simulation software packages have the capability to complete detailed subhourly models of hybrid ground source heat pumps systems. While significant imbalance of heat extractionheat rejection. Both horizontal and vertical wells can be simulated with this. How ground source heat pumps work ground source heating. Ground source heat pump association renewable heat.
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