The brand new Geothermal System Analyzer (GSA) Module is a comprehensive and flexible geothermal lifecycle costing tool. Based on interviews conducted with engineers, designers, instructors (CGD, IGSHPA, etc) and equipment manufacturers, the GSA module is a revolutionary tool built on the backbone of the Finance module that was included in previous editions of GLD. The GSA module quickly calculates lifecycle and annual operating costs, provides a range of standard economic analyses (simple packback, IRR, etc) and provides new reports and color graphs to share with clients. With the GSA Module, designers can quickly demonstrate how their clients will benefit by "going geothermal."

The GridBuilder Module is a new tool that will change the way engineers design systems. The GridBuilder offers an intuitive toolset that enables designers to build and visualize any type of vertical borefield system. Take total control of loopfield shapes, offsets, varying separation distances and frequencies. With the GridBuilder, engineers design and simulate standard and non-standard loopfields with effortless ease.

The 3D G Map is a colorful visualization tool that helps the designer understand how the boreholes in a vertical system thermodynamically interact with eachother and the formation. The user can zoom in to focus on a particular location on the 3D map or zoom out for a holistic perspective on the system. The map is useful for visually comparing different configurations and communicating design decisions with others.

With the new fixed area mode for the horizontal heat exchanger module, users can enter the land area available for the horizontal pipe system and GLD calculates the maximum and minimum entering water temperatures. Similar to the fixed length mode in the vertical borehole module, the fixed area mode provides designers with an even greater degree of design control. The fixed area mode works with straight pipe trenches, pits and horizontal bore systems.

Using Design Day loads data, the user can now use GLD to predict how horizontal system inlet temperatures evolve year after year.

New controls in GLD2012 provide automatic warnings if selected or calculated inlet temperatures for a particular heat pump exceed manufacturer specifications. In other words, GLD helps ensure that geothermal heat exchangers are appropriated matched to the selected equipment.

New color graphs enable designers to visually describe, document and distribute expected lifecycle savings associated with their geothermal system designs.

The Ground Loop Design Geothermal Design Studio consists of the following three design modules:

• The Horizontal Design Module - This module models the pipe, bore, trench and pit lengths (and/or areas) required for a horizontal heat exchanger system.

• The Borehole Design Module - This module models the bore length required for a vertical borehole exchanger system.

• The Surface Water Design Module - This module determines the length of piping required when a closed loop of pipe inserted into a body of water acts as the heat exchange medium.

All three modules utilize the same loads module formalism, and are linked to loads modules using the Studio Link system.

HORIZONTAL DESIGN MODULE

The Horizontal Design module allows the user to enter various parameters with respect to the desired horizontal system. Input is arranged in panels corresponding to the type of input. After the user enters all parameters, the software calculates results such as the required trench/pit/bore lengths, pipe/slinky lengths, the inlet and outlet temperatures, the coefficient of performance (COP), etc., based on the input data. Within this framework, it is straightforward and easy to make changes and conduct new calculations.

BOREHOLE DESIGN MODULE

The Borehole Design module allows the user to enter various parameters with respect to the desired vertical borehole system. Input is arranged in panels corresponding to the type of input. After the user enters all parameters, the software calculates results such as the required bore length, the inlet and outlet temperatures (design day, monthly or hourly), the coefficient of performance (COP), etc., based on the input data. Within this framework, it is straightforward and easy to make changes and conduct new calculations.

SURFACE WATER (POND) DESIGN MODULE

The Surface Water Design module allows the user to enter various parameters concerning the body of water (lake, pond, river, etc.) system. As in the Borehole Module, inputs are arranged in panels that relate to the type of input. After the user enters all parameters, the software calculates the required pipe length, the circuit number, the inlet and outlet temperatures, the COP, etc., based on the design specifications. Again, within this framework, it is straightforward to make changes and recalculate results.

Ground Loop Design employs two different types of load input schemes. With the Zone Manager Loads module, users can perform a detailed analysis. With the Average Block Loads module, users can make quick estimates without performing detailed component design work. These stand-alone modules are linked to design modules using the Studio Link system.

ZONE MANAGER LOADS MODULE

Component-style designs often are more appropriate for geothermal installations, particularly when equipment is available in various sizes. The units can be placed near or within the locations to be conditioned. With regard to water source heat pumps, it is often much easier to bring water lines to the equipment instead of providing ductwork or long load lines from a centralized source.

When considering geothermal applications, the precision of the zone/loads model is crucial because it relates directly to the extent of external heat exchanger installation. Heat exchanger costs impact the overall costs of the project. Additionally, a unit that is called only when necessary or is well matched to a zone will be more efficient than a larger unit that may cycle more often.

Inputs for Ground Loop Design's Zone Manager Loads module include peak load information for each of the zones in an installation at different periods during the day. This loads data can be automatically matched to heat pumps stored within Ground Loop Design's Heat Pump Database. Therefore, ideal and rapid sizing is possible. As with the Average Block Loads module, the annual running time may also be included for a buried heat exchanger. This loading information can be simple or complex, depending on the level of detail the designer desires. To facilitate this model, each zone has its own panel that shows both the zone's loads and the corresponding equipment.

AVERAGE BLOCK LOADS MODULE

For quick estimates and general calculations, there is no need to do a full zone analysis for a project. In these cases, designers can quickly enter data and consider approximate designs using the Average Block Loads module.

The average block model takes peak data from up to four time periods during the peak day, and then uses a generalized form of the automatic pump selection sequence to match a particular type of pump to an entire installation. For buried heat exchangers, the model also uses weekly and annual operational time as parameters. The hours can be computed from monthly loads data using the Equivalent Hours Calculator. If users wish to calculate and simulate monthly and/or hourly inlet temperatures and vertical loopfield performance, monthly and/or hourly loads data needs to be entered as well.

In Ground Loop Design, heat pump data can be entered into a separate module that keeps track of all of the pumps stored in the Ground Loop Design's Heat Pump Database. Families of heat pumps from various manufacturers can be added to the existing pump set maintained by the user. In this way, heat pump data obtained from any source can be easily included within the software to take advantage of the automatic equipment sizing features of Ground Loop Design.

Recent data from popular heat pump manufacturers is included with Ground Loop Design. However, any pump set can be added to the list. The heat pump model only requires that certain data from heat pump specification sheets, or from software provided by the manufacturer, be entered into the Edit/Add Heat Pumps module. The model in Ground Loop Design requires the input of a minimum of six data points for both heating and cooling modes. These data points relate capacity and power to the inlet source temperature and are fit using a polynomial line to provide an accurate model for the equipment for any given design parameters. By including additional data from different source flow rates and/or different inlet load temperatures and flow rates, higher levels of accuracy are possible.

This new module enables designers to easily model, analyze and optimize the piping systems that comprise the foundation of ground heat exchanger systems. Piping systems consist of a wide possible range of connected components including: Manifolds/Vaults, Supply and Return Runouts, Supply and Return Headers, single and double u-bends, the fittings that connect the systems together and circulation pumps. Utilizing a new, patent-pending visual interface for viewing and creating a design via a drag and drop methodology, the CFD module can automatically design optimal flow-balanced (direct and reverse return) systems while providing designers with the flexibility they need for standard and non-standard systems. Outputs include flow rates, fluid velocities, Reynold's numbers, pressure drop, fluid volume and the like for every single point in a dynamic geothermal piping system. The GLD CFD Module is the first tool in humanity's toolbox for modeling the complex fluid dynamics in geothermal heat exchanger systems.

The TC module enables designers to quickly import raw conductivity test data from the GeoCube (a test unit manufacturered by www.precisiongeothermal.com) as well as from other test units. Details about this module, which is sold separately, can be found here.

The studio is the desktop work area in which the designer conducts his or her project analyses and establishes the basis for designs. When additional projects are desired, new windows may be opened or existing projects may be loaded. The Loads modules hold and display the information for the particular installation. Other windows may be opened concurrently. For example, one window may be used to edit or to modify heat pump data, another to calculate equivalent full load hours, and still others to provide easily accessible graphs or charts that may be required repeatedly through the course of a design. Similar design plans can be compared directly, or entirely different designs can be created and varied. All of the information a designer needs exists in one convenient location within Ground Loop Design.

Besides opening and closing windows and taking care of file management, the studio desktop menu and toolbar include control features which can be applied to more than one different type of project. For example, the English/metric unit conversion tool can convert a single window without affecting the rest of the open windows. Project reports can also be printed from the studio desktop.

Recent theoretical advances enable GLD to offer a new borehole superposition model that provides enhanced inter-borehole modeling capabilities. The image below is a 3D representation of the advanced borehole modeling capabilities in GLD. Note that as of GLD2012, Premier edition end users can generate these graphs from within the program.

With the push of a button, the user can calculate and graph the month-by-month inlet temperatures for any vertical borehole field across any design time span. Print out a professional report of the temperatures to share with a client, have the program graph the data automatically or export the data to a spreadsheet. This features requires the input of monthly loads data.

With a new g function engine based off of recent heat transfer research advances, GLD can now model the bore and fluid temperatures and equipment performance hour by hour over one or more design years. The hourly simulation provides very fine control over design and optimization and enables (for example) advanced solar thermal recharge simulations and more precise average annual kWh consumption and performance (COP/EER) calculations. The hourly output reports are well suited for inclusion in LEED submittal materials. GLD accepts hourly inputs from programs such as Trane Trace, the IES Virtual Environment and Excel.

GLD now automatically graphs inlet temperature and power/energy graphs. Do a preliminary design, view a graph, modify the design and then compare the two graphs. Print out the graphs to share with coworkers or to secure a project with the client.

Designers can now choose between fixed temperature mode and fixed length mode.

In fixed length mode, specify a field configuration and borehole depth and hit calculate to determine the inlet temperatures for the particular borehole field.

In fixed temperature mode, specify the inlet temperatures and calculate borehole lengths.

With these features, users can design heat exchangers either by initially defining inlet temperatures or by defining the loop field size (ideal for when the designer wants to determine the capacity of a certain piece of land or wants to reverse engineer a system). GLD is the only program available to offer the commercial designer so much choice.

Hybrid designs have never been easier with the addition of the boiler option. For heating dominated systems instantly add a boiler to reduce your loopfield size. Add a cooling tower for a cooling tower/boiler joint hybrid.

GLD enables users to import any borefield configuration. From circular loopfields to designs that follow the perimeter of a building, GLD can now model any type of user-defined borehole arrangement.

Users can export their borefield designs into AutoCAD for effortless design integration.

Time of Use (TOU) modeling is becoming more common globally as utilities have started charging differential rates for electricity based on its time of use. Therefore, modeling TOU consumption for geothermal systems is growing in importance. With GLD 2010 and hourly loads data, TOU modeling based off of any type of TOU schedule is a straightforward process. After a system is designed and an hourly energy simulation is run, the user can view hourly kWh consumption and use these data in conjunction with a spreadsheet program to calculate TOU-based costs.

The design dashboard is a new tool that enables the designer to quickly review and compare the results from design day, monthly and hourly simulations of a particular vertical borhole systems. By being able to easily view the results from each type of simulation, the designer is in a better position to understand the impact of the loads profile and loopfield design on the system performance and then to make modifications to the design (and possibly building design) to design an optimal system.

In addition to manual input controls for thermal conductivity and diffusivity parameters, the new version of GLD includes a weighted average conductivity/diffusivity calculator that enables a designer to use a drilling log to estimate thermal conductivity and diffusivity via weighted average calculations. Although an in-situ thermal conductivity/response test is considered the gold standard, when such a test cannot be performed the weighted average calculation is a potentially useful alternative. GLD help files include conductivity and diffusivity values for a range of soil types.

The new user interface enables designers to effortlessly select from the three calculation methodologies (design day, monthly and hourly) via a selection box. This interface ensures that designers select their preferred design methodology with ease.

In addition, the new user interface provides the user with ever-present access to calculation results and core design parameters. Users no longer have to navigate to the calculation screen to see the impact of a parameter change on their loopfield lengths.

A powerful new graphing module provides designers with the ability to visually analyze design results in new ways. For example, users can zoom in easily on an area of interest and then zoom back out to review the entire data set as necessary (the black box is the zoom control).

GLD now offers bi-directional integration with leading building energy simulation programs include Trane Trace and the IES Virtual Environment. Import an hourly loads profile (.GT templates, .APS files, .CSV files), design a system, run an hourly simulation, predict the average annual COP/EER and water temperatures and then export .idf files or .aps files back into Trace and the Virtual Environment, respectively

GLD now enables designers to customize GLD reports with company logos. In addition, reports can be prepopulated automatically with standard design firm information.

The new user interface automatically enters circulation fluid data based on drop-down menu options.

The enhanced ever present UI speeds up your designs

Ground Loop Design's reporting features allow the designer to make hard copies of both the data entered and the resulting calculations. These reports are design records, and are valuable when communicating the design to others involved in the projects.

PROJECT REPORTS

Every design module has up to five associated project reports, which can be printed at any time from the Design Studio desktop. The project report contains all the project information, and includes the parameters chosen, the calculation results, monthly inlet temperatures and the name of the zone file used. Both concise and detailed versions of the report are available.

ZONE/LOADS REPORTS

A 'print' button in the loads modules allows the designer to print the loads-related information in various formats. Because the zones contain information about the zones, the loads, and the equipment, it is often necessary to obtain reports of the information in separate as well as combined documents.

For example, at one time, a designer may want to quickly see all of the zones with their loads and corresponding equipment. At other times, the designer may only need to see a list of the equipment for each zone. Ground Loop Design offers five different zone report options including:

• A detailed zone report
• A concise zone report
• A complete list of the selected equipment
• A list of the input loads
• A list of names and pumps associated with each zone

Metric and English help files are included with Ground Loop Design. These files aid in the correct verification and entry of the various parameters. The three main topics/design aids currently included under the Tables menu in the Design Studio are Fluid Properties, Soil Properties, and Pipe Properties. A convenient Conversions table with metric/English conversions in two different formats is included as well for reference. Help files can be opened and left as open windows on the desktop, and the user can refer to them as necessary during the design process.

Realizing that designers and engineers have their own preferred resources, Ground Loop Design employs the HTML browser model so that the user has ultimate control over the help files. The designer simply creates a basic HTML file containing customized data, pictures, graphs, charts, etc. and then modifies the included top level HTML files to link to their pages. The system requires a very basic knowledge of HTML, but it offers an extremely flexible system for user customization.

One of the intrinsic features in Ground Loop Design is the English/metric unit conversion capability. The English/metric option can be used not only to compare values, but it also can be used to quickly make use of specific equipment or loads data supplied in only one format.

Because the reports and help files automatically recognize the selected units, users can obtain different reports and data lists depending on the current state of the Design Studio. Presentation and comparison of project information between different engineers and designers is now a straightforward process.

Ground Loop Design offers the user a great deal of freedom in how he or she enters and uses information. Rather than conforming designs to the software, this software package allows some modification and variation in its included features.

Some of the most common areas of customization in Ground Loop Design include the entry of loads and the selection of equipment. Although fully automatic modes are available, the user also has the ability to customize or override the automatic features. For example, detailed load information may be included for precision designs, while extremely limited data is enough for rough calculations. Additionally, if the data are available, the designing engineer can enter his or her own pump set to take full advantage of the automatic selection procedures. Also, different families of pumps can be used within a single project, and even individual pumps not included in the pre-defined pump sets can be employed as required.

Another area where customization is possible is in the help files, which are based on HTML. With a simple HTML editor the user can include any tables, data, pictures, graphs, charts, or any other useful information that meets the user's needs. User-added files can supplement or replace the help files already provided with Ground Loop Design.

Because the reports and help files automatically recognize the selected units, users can obtain different reports and data lists depending on the current state of the Design Studio. Presentation and comparison of project information between different engineers and designers is now a straightforward process.

A major feature is the international component of Ground Loop Design. Because the program is multi-language capable, users can easily communicate accurate results and design parameters across borders, even when the designers are not proficient in the technical language of their foreign counterparts.

Currently, Japanese, Chinese, Korean, Italian, Spanish, Russian, Czech, Lithuanian, French and Romanian versions are available. If you would like a version in your language, please contact us.