Combined Heat & Power


CDH Energy has significant experience with combined heat and power (CHP) and on-site power generation technologies including microturbines, internal-combustion engines, fuel cells and large turbines. We also have experience integrating state-of-the-art components into highly effective CHP systems that cost-effectively utilize available power and waste heat to provide the most economic benefit to the customer.

CDH has a long history of collecting detailed, field-monitored data to quantify the performance of these systems in actual building applications. This experience provides us with a data-based understanding of how the technology actually works in real-world applications. We have completed numerous feasibility studies to assess the economic and technical potential of CHP at specific customer facilities; completing detailed hour-by-hour annual analysis to consider seasonal variations in buildings loads and equipment performance as well as the impact that electric standby rates have on electric savings and project economics. Our approach is to combine the technical, economic and financial details into a combined technical-economic "pro-forma" that can look at all project risks and sensitivities in an integrated way.

Example Projects

Demonstration of PureComfort System at Hospital – Providence, RI

CDH installed monitoring equipment to quantify the performance of this microturbine-based CHP system. The system includes an exhaust-fired chiller-heater that can provide chilled water to the central plant or provide hot water to meet space heating loads. The monitoring system measures the performance of the CHP equipment as well as the other equipment at the site in order to understand how effectively heat is being applied to meet the facility loads.

Logger Panel     Temperature Sensor     Power Transducer

Nursing Home (Technical Assistance and M&V) – Bronx, NY

CDH Energy reviewed this CHP system for compliance with NYSERDA program requirements, including design review, system commissioning, review of environmental testing, and performance M&V plan development. The CHP system consists of three 100 kW reciprocating engine generators, that recover jacket water and exhaust heat to a common hot water header. The recovered hot water are used to displace building heating and domestic hot water loads met by a conventional large boiler system. Hot water is also used to drive 90-tons of absorption chiller.

CDH Energy also was responsible for delivering the data acquisition system (DAS) for the M&V effort. CDH constructed and installed the DAS components, which measure system net power, total useful heat recovery, heat recovery rejected to ambient, and natural gas consumption. The DAS system interfaced with sensors installed in the CHP system, with CDH providing the supplemental sensors and measurements necessary to characterize system performance.

Tecogen Inverde Chp Units     Temperature Sensor      Power Meter     Data Logger Panel

Hospital – Syracuse, NY

CDH Energy reviewed this CHP system being installed at the hospital for compliance with NYSERDA program requirements, including design review, system commissioning, review of environmental testing, and performance M&V plan development. The CHP system consists of a single 4.5 MW combustion turbine generator, producing 85-psig steam for use by multiple hospital loads. CDH reviewed the proposed system operational data, and provided independent calculations supporting the anticipated system performance. Based on our analysis, this CHP system will produce 33.4-million kWh/year, 157,600 MLbs of steam, and consume 4,447,000 therms of natural gas, resulting in an annual fuel conversion efficiency of 63.7% HHV. The project will provide the hospital with annual savings in operational and energy costs, and has a projected simple payback of 11 years.

Turbine Gas Train And Heat Recovery Stream Generator (Hrsg)     Gas Turbine Enclosure     HRSG Feedwater Temperature Sensor

Medical Center – Albany, NY

CDH Energy monitored this 4.5 MW combustion turbine CHP system. CDH developed the monitoring and verification plan based on the applicant supplied instrumentation package. Points monitored included gross turbine output and ancillary support equipment consumption, combustion turbine and heat recovery steam generator (HRSG) duct-burner gas consumption, gross steam production and deaerator tank steam consumption, and feedwater conditions. For this large power plant project, CDH worked with the plant controls contractor to develop a reporting mechanism from the CHP control system, and collected and analyzed performance data.

The measurements are used to develop an energy balance around the CHP prime mover to determine net generation and total fuel conversion efficiency. Data are collected on a 15-minute interval, processed by CDH Energy, and posted nightly to the NYSERDA CHP Integrated Data System.

Heat Recovery Stream Generator (Hrsg)     Gas Turbine     Hrsg Gross Steam Meter And Temperature Sensor

CDH Energy has performed similar CHP M&V efforts for NYSERDA at 23 other CHP installations in and around the NYC metro area.