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Combined Cooling and Power (CCP) is a CHP-based system designed to supply electrical energy and cooling.
How does CCP work?
The system has been successfully employed to provide a turnkey energy solution for Mission Critical facility where high security of both power and cooling are essential. Based on the Dresser-Rand Nimbus CHP range matched to close-coupled absorption chillers, these systems achieve high standards of efficiency. The CCP system eliminates the majority of the air conditioning power needs thus reducing the overall energy demand of the building. The cooling and power produced by the CCP based turnkey system for Mission Critical facilities can be configured to exactly match site requirements.
What are the advantages of CCP?
The CCP turnkey system can be designed with backup provision for every function to ensure no single point of failure. The careful rating of cooling capacity provides similar reliability for the maintenance of building and equipment temperatures through climatic extremes. The exceptional environmental performance of the CCP system can reduce CO2 emissions by up to 20%. Together with the avoided cost of standby generation and electric air conditioning, as well as reduced electrical connection costs, the system can provide significantly lower lifetime costs for energy supply to a host facility.
What is secure power?
The most reliable method of improving power security is to continuously operate a generating plant on site. To do so efficiently and cost effectively, a CHP or CCP solution should be employed. Secure power is any system that will improve the reliability of the normal power source, which in most instances is electricity provided by a utility.
The design of a secure power system is specific to each application and each site must consider issues such as the extent of the system which needs security, the effect of loss of this security and the significance of voltage or frequency changes and harmonics on the system.
The most secure single source of power in most countries with a developed power infrastructure is grid electricity. Grid systems are, however, extremely complex and subject to interruption due to accidents, weather, or operational problems. For some businesses, an occasional loss of power is merely an irritation, for others there are potentially serious implications. An unstable or unreliable utility connection which imposes frequent loss of power will adversely affect business and profitability.
Secure power is generally considered by systems designed to achieve 99.99% availability and above. This is referred to as "four-nines" system. Five-nines (99.999%) availability is commonly required in the telecommunications industry and other critical processes. Six-nines (99.9999%) is generally regarded as the highest level of power security commercially available and affordable. Applications requiring six-nines (99.9999%) reliability are generally found in financial data processing, high-value production processes, and special services sectors.
Reliability
In most applications there is a demand for heat and/or cooling. A Dresser-Rand CHP system designed to address these will provide long-term economic and environmental benefits in addition to the enhanced security. The total power supply system must be fully controlled and automated to achieve this, and as the CHP system is the most important component, the overall control is directed by the CHP. The Dresser-Rand CHP system operates in both parallel and island modes and switches seamlessly between these. A no-break power supply is provided by the CHP Power Delivery Control (PDC) system. On disconnection the PDC continues to monitor utility status and when stability returns, automatically synchronizes, returning the site or process to parallel operation.
It is normal to match process CHP to the thermal requirements of the process. Therefore electrical capacity may exceed process requirements. It is also more common to provide a single generator in a process application. As every process has a different requirement for energy, security and power quality, detail and design of the Dresser-Rand CHP system and the PDC system is unique to the process. The scope can be extended to include power-conditioning equipment, which would be provided and integrated in partnership with a reliable manufacturer of such systems.