Ground source heat pump installations can be eligible for the domestic or commercial rhi, this is a government incentive which will pay you money back when you install a heat. Geothermal horizontal ground loop hvac contractor talk. Modeling geothermal processes with comsol software. Is the slinky realy the answer to go or should we trench for long runs to be sure. It is achieved by burying thousands of feet of pipe in trenches or a pitstyle excavation. The hvac contractor sells and sizes the job and then usually tells the groundloop subcontractor something like, i need a 5ton slinky loop installed at this address. Gld works with all versions of windows including windows 10 32b or 64b and can also be emulated on a mac with bootcamp or parallels. Geothermal hvac software ground loop design, load calculation. The horizontal design module allows the user to quickly and flexibly design nearly any type of horizontal system. Closedloop systems can be installed horizontally, vertically or in a pond.
Openloop systems use an existing water well or surface water. Tools to design and support your ground source heat pump installation. This prevents any contaminates from affecting unit performance and extends system life. So, the first step in sizing an earth loop is having a correct heat lossgain calculation done. The heat exchanger may be composed of any number of boreholes arranged in various configurations. Patented residential and commercial geothermal design software to simplify your effort and improve accuracy in ground loop design, energy cost analysis, hybrid design, and solar design. A water geothermal horizontal loop system utilizes a network of sealed and pressurized plastic pipes that are buried into the ground horizontally, just below the earths surface. Used in more than 70 countries, gld is the tool of choice for innovative engineering, design and consulting firms. This will provide a net gain over the antenna in freespace. Gld works with all versions of windows including windows 10 32b or 64b and can also be emulated on a mac with bootcamp or parallels download a free evaluation now. 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.
Patented residential and commercial geothermal design software to simplify your effort and improve accuracy in ground loop, energy cost analysis, hybrid. The software calculates results such as the required trenchpitbore lengths, pipeslinky lengths, the inlet and outlet temperatures and the coefficient of performance cop. Here is an overview of the function of a geothermal system, the factors that can influence installation and the major differences between a horizontal ground loop and a vertical ground loop. Horizontal ground loop in ontario and across canada horizontal ground loops are employed in the majority of all ground source geothermal installations. Ground loop pipe size greenbuildingtalk green building. Geothermal vertical ground loop geothermal north carolina. The plans to the loop field are easy to understand but applying the technology to the design is quite complicated. Each time you add a pair of pipes, your trench length per nominal ton of capacity goes down, but your total pipe length and antifreeze volume must go up.
When the pipe is in, a special thermalconductive grout is pumped into to ensure uniform contact with the earth, which ensures efficient heat transfer between. That means it has to run for 12 min just to circulate all the fluid thru the hp. As one of the more cost effective loops to install, horizontal loops are. Other established horizontal designs can use four or six pipes in a trench. Once this is done, the program will do the calculations automatically. Regardless of what someone may claim, the laws of physics still supercede advertising claims. Ground heat exchanger design the design of ground heat exchangers is complicated by the variety of geological formations and properties that affect thermal performance. 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. Closed horizontal loop trench sizing greenbuildingtalk. The following is an article which i wrote and was published in the february 20 edition of the central coast arc. Horizontal closed loop what if question geoexchange forum. A longperimeter horizontal loop antenna normally is used as a multiband device, otherwise a completely different one or twoband antenna would be erected.
The tried and true horizontal loop system uses 2 straight pipes in trenches and requires way more space. Patented residential and commercial geothermal design software to simplify your effort and improve accuracy in ground loop. 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 horizontal loop vertical pattern stays relatively constant, only decreasing in ground loss as height is increased. The following is an article which i wrote and was published in the february 20 edition of the central coast arc smoke signals magazine. Download ground loop design premier now and view 99% of the program modules and interface.
Design the loop to meet the rated capacity or a targeted entering water temperature. Software versions available three versions of ground loop design are available. A horizontal ground loop is installed over a wide area of ground and requires enough space to dig trenches hundreds of feet long and 610 feet deep. Geothermal design software patented vertical, horizontal. In geothermal designs, dont succumb to rules of thumb 2016. The component which can restrict a wide operating bandwidth is the choke balun.
Note that all the work shown here can be scaled to 5 mhz 60 meters or 7 mhz 40 meters for nvis work with a better signal. Geothermal loop installations trenchless technology. Typically, there are two main loop systems horizontal and vertical closedloop systems. In fact, if you want a horizontally polarized antenna with equal gain in the horizontal plane, a horizontal small loop is a great way to do it.
Have the distributor run a full load calc, with geo software. I am planning on a 5 ton unit and was considering using the same idea that we used on my brothers for the ground loop, 5 trenches 250 feet long, but only 1. The ground loop is a key component of the ground source water geothermal system. Horizontal hf antennas benefit from nearby ground gain. The 40m loop antenna ed, vk2ji this antenna is also known under the names sky loop and dxbuster and is very similar to a horizontal delta loop. The closedloop borehole heat exchanger bhe is a standard approach for lower and middepth applications. Careful design is necessary to ensure that there is sufficient capacity available for the geothermal heat pump to operate properly. Sep 15, 20 quantum geothermal specializes in the installation of residential geothermal systems in southern ontario. The ground loop is a key part of the geothermal system and it must be properly designed and installed. Right loop contains diffusivity and conductivity numbers for both ashrae and epri earth types, and supports custom diffusivity and conductivity from soil testing. Ground source heat pump horizontal array ground works. Some examples, depending on system size, of typical horizontal ground heat exchangers are.
Each of the four trenches is 87 feet long and carries 800 feet of 34 sdr11 hdpe pipe. The ground loop trenches meet on the front and rear of the house with two sets of supply and return headers that serve the heat pump unit in the garage. Vertical and horizontal ground heat exchanger modeling. Geothermal loop design for gshp in a geothermal loop designvertical horizontal hybrid geothermal design software ground loop design ground source heat pumps utilizes water to cool and heat the refrigerant instead of air. I considered a vertical closed loop, but the horizontal would be much cheaper for me since we have the epuipment to use.
Quad loops belcher, wa4jve, casper, k4hkx, ref 1128, and dietrich, waordx, ref 677, have published studies com paring the horizontally polarized. Your earth loop must be matched to the home, and the geothermal heat pump, that it is coupled to. May 30, 20 in my case the ground wire lays on the ground and is well grown into the grass. Less stable underground temperatures, especially at horizontal ground loops are more cost effective than drilling boreholes. Farm is on a hilltop area and ground is almost all shale. A long trench is excavated to a depth of 56 feet approximately 1.
In horizontal geothermal ground loops, several hundred feet of five to six feet deep trenches are dug with a backhoe or chain trencher. Ground loop design gld 2016 edition is the leading software suite for. There are three types of closed loop geothermal systems. Glhepro was developed as an aid in the design of vertical boreholetype ground loop heat exchangers used in geothermal heat pump systems. They also have pressure drop calculator software for different loop configurations, antifreeze, etc. A 5ton loop is really a rule of thumb, so, instead, the contractor should be saying. Ground loop tradeoff the ground loop is the most expensive part of the geothermal installation, and reducing its length will decrease installed costs substantially. Vertical closedloop contractor means a person qualified to engage in the business of constructing, installing, repairing, or decommissioning vcls or other heat exchange wells.
Vertical closedloop contractor does not include an employee of a vertical closedloop contractor or a contractor who installs horizontal closedloops. Ground loop design gld is a software tool for designing and optimizing ground source heat pump systems. Once the land has been infilled there is no evidence of the pipe work or scars from the trenches. If you arent going to learn the physics such as the effect of increased soil contact area then run some software that will do it for you. A horizontal loop is typically buried 35 ft deep and at a length of 500 to 600 feet per ton. Ground source heat pump installations can be eligible for the domestic rhi or commercial rhi, this is a government incentive which will pay you money back when you install a. I used the loop off and on over two years with reasonable success in qrp fox hunts and other misc. Horizontal ground heat exchanger design for groundcoupled. Ground loop design gld is the leading software suite for designing geothermal ground source heat pump systems.
It is currently in an open loop configuration, and am planning to convert to horizontal closed loop in ohio. Horizontal loops require a lot more space than you realize. Development of new ground loop sizing tools for domestic. Horizontal pipe loops cost less than vertical bores and they have mixed advantages. Gld works with all versions of windows including windows 10 32b or 64b and can also be emulated on a mac with bootcamp or parallels download a. Initially i designed the horizontal ground loop as a 56 slinky at 6 depth, 4 trenches for a 3 ton system, spaced 10 apart at length. By using thermallyenhanced grout, designers can increase the thermal conductivity of the loop, allowing it to extract more btus from the ground faster, meaning less feet of. Geothermal horizontal ground loop my first geo job and am getting mislet by many subs. Horizontal closed loop system rhi energies has the in house capability to offer a complete turnkey package from the modelling of the ground source loop design, using the latest design software, through to the installation of the system pipe work to the final commissioning and after sales management for horizontal, closed loop, ground source.
A typical home requires 14 to 34 of an acre for the trenches. Gld is windowsbased and runs on macintosh computers running parallels or bootcamp. Development of new ground loop sizing tools for domestic gshp. Large, horizontal loop antennas fed via balanced or. The pipe is buried at a depth of 68 feet to provide adequate frost protection. Nov 01, 2010 getting in the loop vertical or horizontal. In a bhe, fluid circulates through pipes that are located inside of boreholes, resulting in indirect thermal contact between the fluid and the subsurface.
Ground loop design geothermal design studio users guide. I need a 5ton loop, which consists of five slinky loops of 800foot pipe in a. A heating dominant loop on the other hand, sucking heat out of the ground, actually attracts moisture. Windowsbased revolutionary geothermal hvac software design package gld software. Geothermal earth loops come in several different configurations depending on space. Horizontal ground loops are more cost effective than drilling boreholes. While glhepro may be used for residential system design, it is aimed at commercial systems. Ground water systems usually employ a plate heat exchanger inside the building to keep the building water loop separated from the ground water. In geothermal designs, dont succumb to rules of thumb. Mar 18, 2014 one of the most important of these decisions is whether to use a horizontal ground loop or a vertical ground loop for heat transfer. Jul 25, 20 ground source heat pump horizontal array ground works. Mar 28, 2014 the closed loop borehole heat exchanger bhe is a standard approach for lower and middepth applications.
Residential horizontal closed loop system rhi energies. Size ground loops for residential geothermal systems. They produce horizontal radiation with takeoff angles determined, as usual, by the height of the horizontal loop over ground. A horizontal ground loop is one of the most commonly installed ground loop types. Ground loop heat exchanger design software building. In my case the ground wire lays on the ground and is well grown into the grass. Horizontal ground loop systems are used when adequate yard space is available.
Water fluid is circulated in a closed loop heat exchanger located in the earth where the earths temperature at 28 feet below the surface is constant. In a geothermal loop designverticalhorizontalhybrid geothermal design software ground loop design ground source heat pumps utilizes water to cool and. Ground water systems are often the most efficient as the ground water is always at the same temperature yearround. With 34 pipe, i dont think turbulent flow makes much difference. Geothermal horizontal ground loop geothermal north carolina. Feb 15, 2016 the hvac contractor sells and sizes the job and then usually tells the groundloop subcontractor something like, i need a 5ton slinky loop installed at this address. The rule of thumb is that 400 to 600 ft of pipe out and back per ton of load is required for a typical residential system. A horizontally polarized dipole by comparison would have two nulls off the ends of the antenna. Quantum geothermal specializes in the installation of residential geothermal systems in southern ontario. On one page in the guide, they reprint a graph illustrating that deeper in the ground 12 feet down the soil temperature swing is more constant throughout the year, with larger temperature swings closer to the surface.
The amount of pipe in the ground and the distance those feet are apart from each other is much more critical. Geothermal design software patented vertical, horizontal, hybrid. A vertical loop is another variation of the closed ground loop and is installed by drilling vertical boreholes 100 to 300 feet down into the ground, and putting a loop of pipe down it. 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. A few weeks ago, i shared a piece thanks to ryan carda on geothermal flow path analysis for ground loop design that came from a discussion. There are several basic types of ground loop systems that can be used for commercial and residential buildings.
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