DOE EERE Research Reports

Distributed Energy Resources and Combined Cooling, Heating, and Power

Integrated Energy Systems (IES)

Modular Integrated Energy Systems

Task 5 Prototype Development Reference Design Documentation
April 2006

Honeywell Laboratories
3660 Technology Drive
Minneapolis, Minnesota 55418

Abstract: This document presents a set of Reference Designs for Modular Integrated Energy Systems (IES). Development of standardized packaged IES modular systems will provide lower life-cycle costs, and will also speed the acceptance of this technology in the marketplace. Streamlining the upfront design process is needed to produce the greatest benefit from IES technology. The project team’s focus is on IES modular systems in the 1- to 5-MW size range, with 900 to 3000 tons of cooling. These systems are typically intended for central plant and district energy applications serving multiple buildings.

Because large IES systems’ (1 to 5MW in size) installation scenarios vary widely, packaging is dependent on modularity, namely, the ability to construct a system by choosing from a selection of compatible components with standardized interfaces. This is especially important for larger IES systems, where the physical size of the equipment prohibits the manufacture and shipment of the entire system in one enclosure. Designing these systems as a number of component modules with each corresponding to a piece of major equipment (i.e. gas turbine-generator, heat recovery steam generator, and absorption chiller or chiller-heater) simplifies the design and installation process by reducing the amount of site-specific engineering and site preparation required. The benefits of applying a “reference” package design are:

  • The amount of custom design work for a given site application is greatly reduced. These modular Reference Designs provide IES systems that are more cost-competitive through a reduction in installed cost and optimal matching of equipment to the energy loads.
  • These improved economics can serve to validate applications that may have otherwise been difficult to justify (from a purely economic standpoint). For these applications, the other benefits provided by IES technology (e.g., reduced emissions, improved IAQ, and increased energy efficiency) are thus made available to the central plant/building owner and occupants.
  • Readily available reference designs can serve to shorten the time required to perform the upfront analysis needed to quantify the economic and other benefits offered in each individual application. This will help speed the process of evaluating candidate IES applications.


Keywords: IES, integrated energy system, modular designs, reference design, gas turbine, absorption chiller, CHP

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