Here are the four basic steps to geothermal heat pump design. Design and installation of closedloop systems 2007 edition before considering a ground source heat pump, it is important to explore ways of minimising space heating and hot water demand by incorporating energy efficiency measures. Heat from the ground is absorbed into the fluid and then passes through a heat exchanger into the heat pump. However, these are rarely used by domestic groundsource heat pump installers owing to their complexity and availability. 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.
Heatspring magazine 3 ground source heat pump gshp. Careful design is necessary to ensure that there is sufficient capacity available for the geothermal heat pump to operate properly. The ground itself is not a perfect heat sink source because the energy added to the ground by the loop can change its. Building heat loads and heat pump selection design of groundcoupling design software other ground loop considerations other system design issues pumps and piping ventilation air cost control how to stay out of trouble references. This new work takes advantage of the many lessons learned since the time of the original publication. Open loop systems are the most efficient ground source heat pump option. Basic design considerations for geothermal heat pump. Geothermal heating and cooling is a complete revision of ground source heat pumps. The plans to the loop field are easy to understand but applying the technology to the design is quite complicated. 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 gld is an integrated suite of powerful, flexible and customizable tools for designing commercial and residential closed loop ground source heat pump systems. A geothermal heat pumps earth loop installation is not just a matter of burying some pipes and hooking these pipes to your geothermal heat pump. The apachehvac boiler and chiller components are a placeholder that will simply record loads for the gshp, ground source 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.
Sysapm010en water source and ground source heat pump systems 1 overview of a water source heat pump system in a typical water source heat pump wshp system, each zone has a dedicated wshp that cools or heats air to maintain the desired temperature in that zone. Software versions available three versions of ground loop design are available. Details on the common ground source heat pumps systems lund, 1989 two major types exist. This removes the need for an intermediate heat exchanger, removes the filtration issues and allows the use of antifreeze within. Heat from the ground or water is absorbed into the fluid and then passes through a heat exchanger into the heat pump. Charles remund, author of the international ground source heat pump association igshpa design manual, explains how to design a ground heat exchanger for a commercial geothermal system. Ground source heat pump systems are still rare mostly due to cost, but seem to be on the upswing each year due to increasing utility bills. The ground coupled uses a buried earth coil with circulating fluid in a closed loop of horizontal or. A wshp contains all the components of a refrigeration circuit, including one or. Glhepro is used for designing ground loop heat exchangers for use with ground source heat pump systems. Commercially available software packages for designing closedloop gshp systems, such as earth energy designer eed, ground loop designer gld and glhepro have been available in the uk for some time.
Your earth loop must be matched to the home, and the geothermal heat pump, that it is coupled to. Nov 15, 2016 a typical groundwater heat pump system design consists of a central watertowater heat exchanger between the groundwater and a closed water loop that is connected to watertoair heat pumps located in the building. Ive had a manual j and d completed, and now the ground loop design in coming back and i just dont understand how these folks are coming up with their numbers. Rightloop requires you to set your bin data and earth temperature cities, select your groundsource heat pump equipment and circulating pump, and set your equipment configuration and loop characteristics. Applications heat pump systems ground source heat pumps. Their flexible design requirements make them a good choice for schools, highrises, government buildings, apartments, and restaurantsalmost any commercial property. Alongside the easy rss heat pump design area, the heat loss area, emitter log and hot water calculations allow the other elements of heat pump sizing and specification to be completed. A large loop of pipe, known as a ground loop is placed in the ground or through a body of water the pump then circulates a mixture of water and antifreeze around this loop. The design of a system for a specific application, including selection of the proper piping materials and ground loop installation method, is an important part of installing a successful system. Geothermal design for residential and commercial systems integrated to save time in your ground loop design, energy cost analysis, and hybrid design. As seen in the illustration above, a ground source heat pump uses a considerable loop of pipe with liquid. He is a coauthor of design and installation of residential and light commercial gshp systems, developed in cooperation with the international ground source heat pump association.
Groundsource heat pumps if you are interested in installing an environmentally responsible heating, air conditioning and water heating system in your home, you have come to the right page. In open loop systems, groundwater is abstracted at ambient temperature from the ground, passed through a heat pump before being reinjected back into the ground or discharged at the surface. 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. We supply heat pump equipment, polyethylene pipe, and other related products used for ground heat exchanger installation. If you are interested in installing an environmentally responsible heating, air conditioning and water heating system in your home, you have come to the right page. Design of geothermal systems for commercial and institutional buildings, which is recognized as the primary reference for nonresidential ground source heat pump gshp installations. Sep 25, 2011 short video showing the installation of slinky ground loop pipes for a ground source heat pump system. Used in more than 70 countries, gld is the tool of choice for innovative engineering, design and consulting firms. Performancebased contracting is the future of residential geothermal. The design water flow rate and temperature from the earth sets the performance of geothermal heat pump equipment rather than the outside air temperature used by hvac air source equipment. Ground source heat pumps can pump heat from the ground into a building to provide space heating and domestic hot water. Hygchp is a software module that can help you analyze this option.
Geothermal design software patented vertical, horizontal. Gld is windowsbased and runs on macintosh computers running parallels or bootcamp. Free design software ground source heat pump design. This is done by using what is known as a ground loop, or energy supply source. Glhepro was developed as an aid in the design of vertical boreholetype ground loop heat exchangers used in geothermal heat pump systems. The ground pump can also act as heat absorber and remove the excess heat building up in the summer. This is the first edition of the binational ansicsa c448 series, design and installation of ground source heat pump systems for commercial and residential buildings. Manufactured by kensa in the uk, for the uk market, kensa ground source heat pumps are designed with a range of british build types in mind this is why we are the only ground source heat pump manufacturer that offers a single phase unit up to 24kw single phase, enabling simple specification and straight forward installation.
For every unit of electricity used to pump the heat, 34 units of heat can be produced. Other terms for a ground coupled heat exchanger are the ground loop or the source heat exchanger. Design and installation of closed loop systems 2007 edition kwh of useful heat supplied almost double the co 2 emissions from the gshp. Second, application of the simulation for design of vertical ground loop heat exchangers glhe will be introduced. Geothermal systems that work by design, not by accident ground loop design software gldtm is the worlds leading commercial ghx software design tool with design professionals in more than 60 countries using it in a dozen different languages to design english and metric based systems. Geothermal systems benefit from the constant temperature of the earth where water circulates in the ground heat exchanger. 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. Hey guys, ive visiting this site for a while now learning all about ground source heat pumps and would really like to use one on our new home we are building. A ground source heat pump circulates a mixture of water and antifreeze around a loop of pipe, called a ground loop, which is buried in your garden. Geothermal heat pumps wbdg whole building design guide. It supersedes the previous editions published in 20 and 2002 under the title, design and installation of earth energy systems. This design takes advantage of the moderate temperatures in the ground to. The heat exchanger may be composed of any number of boreholes arranged in various configurations.
This removes the need for an intermediate heat exchanger, removes the filtration issues and allows the use of antifreeze within the system to avoid problems with freezing. They extract heat from ground water before returning the same water to the ground, where it immediately begins to regain heat from the earth. The system uses ground heat or groundwater, in some situations, to heat the home in winter. It uses the earth all the time, without any intermittency, as a heat source in the winter or a heat sink in the summer. Geothermal hvac software ground loop design, load calculation. This program will design your geothermal system instantly, once the data set is completed. Geothermal loop design for gshp in a geothermal loop design verticalhorizontalhybrid geothermal design software ground loop design ground source heat pumps utilizes water to cool and heat the refrigerant instead of air. The emission figure for electricity is an average for the uk generation mix. For possible measures see domestic energy efficiency primer gpg171. The ground loop is a key part of the geothermal system and it must be properly designed and installed. It is sold by the international ground source heat pump association. In particular, there can be a postcode lottery element to vertical arrays, as the cost of borehole digging varies enormously around the country. For more information, visit the international ground source heat pump association. Ground source heat pump gshp systems exploit this natural temperature difference for heating or cooling demands.
Ground loop design software gldtm is the worlds leading commercial ghx software design tool with design professionals in more than 60 countries using it in a dozen different languages to design english and metric based systems. Ground loop design 2010 or glhepro can be used to test out the viability of some hybrid designs its hybrid functionality is relatively basic. Ground loop heat exchanger design software building. Ground loop design gld is the leading software suite for designing geothermal ground source heat pump systems. Development of new ground loop sizing tools for domestic. The package enables designers to determine the correct lengths of bore or pipe required for commercial vertical, horizontal andor pond heat excahngers, optimize the piping configuration for balanced flow. Design of geothermal systems for commercial and institutional buildings, which is recognized as the primary reference for nonresidential groundsource heat pump gshp installations. The slightly more efficient gshps work by extracting heat. A ground source heat pump is designed to use this constantly renewed energy to supply domestic heating and hot water.
Using groundsource heat pump systems for heatingcooling. The heat pump unit is positioned inside your home, garage, utility or kitchen and the ground loop pipes are then piped through into the ground outside to extract the renewable energy. Lower operating and maintenance costs, durability, and energy conservation make ground source heat pumps the smart choice for commercial applications. Gld is the choice of professionals in over 62 countries. An alternate strategy is to circulate the ground water through a heat recovery chiller that is isolated with a heat exchanger and. This design takes advantage of the moderate temperatures in the ground to boost efficiency and reduce. Basic design considerations for geothermal heat pump systems. Development of new ground loop sizing tools for domestic gshp. Heat loss room by room heat loss calculations emitter log. If the heat pump was supplied with energy from a renewable source, co 2 emissions could be. A critical element of a successful ground source heat pump installation is the ground loop design and construction where enough land is available the most costeffective and economical way to extract heat from the ground is from a number of horizontal loops of plastic pipe buried in the ground. As the ground stays at a fairly constant temperature under the surface, the heat pump can. Polar bear geo clean energy for a sustainable future.
Finally, the ground loop for the ground heat exchanger could be designed from the commercial software such as the gaia geothermals gld ground loop design. There are approximately 50,000 geothermal heat pumps installed in the united states each year. The ground source heat pump is likely to cost around. Ground source heat pumps ground loop heating and air. Our new piping system designer is unique to the geothermal industry.
Participants are quizzed on key concepts and then use looplink pro software to work through design and load calculation assignments. Open loop borehole water source ground source heat pumps. As an alternative to open loop it is possible to place the ground loops directly in the water source mounted on mats, called pond mats. Trnsys and energyplus welltested fullbuilding simulation software packages have the capability to complete detailed subhourly models of hybrid ground source heat pumps systems. While glhepro may be used for residential system design, it is aimed at commercial systems.
A hybrid geothermal heat pump system can lower your costs by reducing the peak capacity of your ground loop and allowing you to install a smaller, less expensive ground heat exchanger. One of the main advantages of trnsys software for the modelling and design of ground source heat pumps is that it includes components for the calculation of building thermal loads, specific components for hvac, heat pumps and circulating pumps, modules for borehole heat exchangers and thermal storage, as well as climatic data files, which make. Ground source heat pump ground loop installation 4 youtube. Gld is the leading software suite for geothermal heat pump and ground heat exchanger system design. Geothermal heating and cooling is a complete revision of groundsource heat pumps. Supplemental to our design services, sound geothermal is also a supplier of products and technical services for geoexchange ground source heat pump, solar thermal, and high efficiency gas dhw and boiler applications. Watertoair and brinetoair heat pumps en 14825 air conditioners, liquid chilling packages and heat pumps, with electrically driven compressors, for space heating and cooling testing and rating at partload conditions and calculations of seasonal performance 50. This new work takes advantage of the many lessons learned since the time of the. In a geothermal loop designverticalhorizontalhybrid geothermal design software ground loop design ground source heat pumps utilizes water to cool and heat the refrigerant instead of air. So, the first step in sizing an earth loop is having a correct heat lossgain calculation done. The package enables designers to determine the correct lengths of bore or pipe required for commercial vertical, horizontal andor pond heat excahngers, optimize the piping configuration for balanced flow and optimal heat transfer, and calculate the annual and lifetime.
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