ASHRAE Journal - January 2011 - 40

gine jacket water circuits. Piping for the gas engines’ jacket waste heat recovery circuits were based on typical details for such applications with plate-type heat exchangers.

Synch

Change-Over Panel

Diesel Generator 1,500 kW

ACB–2 (3,200A, TP) DG E E Take Off Panel–1 (6,000 Amps)

Energy Management System

The energy management system GT Gas Turbine 1,450 kW (EMS) is based on a cogeneration power E E plant consisting of the previously described 1,450 kW combustion turbine, 1 three 1,450 kW gas engines and one Gas Engine 1,450 kW GE 1,500 kW diesel engine-generators, with E E thermal load-following mode to help en2 sure the highest cogeneration efficiency. GE Gas Engine 1,450 kW The EMS has been installed to provide: E E BUS Coupler • Monitoring of various data (4,000A, TP) through a central system onto a 3 GE Gas Engine 1,450 kW Take Off Panel–2 computer; E E (3,000 Amps) • Calculations for the optimum pieces of equipment that should be used based on highest cogeneration efficiency use and energy Figure 2: Generators and electrical single-line diagram. capable of being produced; • High level interface to combustion High Temperature, turbine, diesel and gas engines and Hot Water Absorption Chiller, operating parameters to cover their Peak Capacity 700 Ton Triplex WHRB for Three Gas display onto the computer; and Engines, Each for 150 Ton High • Assurance that both thermal and Temperature, Hot Water Absorption Chiller Capacity electrical energy requirements would be met with maximum cogeneration plant efficiency by the Gas Turbine Exhaust Hot Water Pumps WHRB for 550 Ton High (High Temperature) EMS designating an optimal comTemperature, Hot Water bination of installed operational Absorption Chiller Capacity generating equipment. The EMS covers the combination of generating equipment required to be Low Temperature, Hot Water Circuit Heating With Heat Exchanger operated and is displayed on the control 248°F Hot Water to Obtain 203°F Inlet for Chiller room computer console so an operator 1 ton cooling = 3.517 kW manual-informed decision can be made to either start or stop various CHP plant Figure 3: Cogeneration power plant high temperature hot water piping schematic. equipment. The EMS also monitors various key parameters of the enNormal Production-Time Operation. The factory’s airgines, gas turbine and waste heat recovery boilers. Data can conditioning load for the central paint booths would dictate be provided, based on time of day, week, month, year and past which equipment to operate. The primary indicator to dehistory, recommending the use of various options via indica- termine the performance of air-conditioning and resulting tors on the computer console. thermal loads (from waste heat recovery of the cogeneration power plant) is the supply chilled water temperature to coolThermal Load-Following Mode ing coils located in the central paint booth areas. Off-Time Operation. The factory and office off-time load The EMS also confirms the desired selection of equipment is expected to be handled by either the combustion turbine- to the operator so that the combined operation of CHP plant generator or one gas engine-generator (depending on season), equipment ensures electric power requirement with optimal with the option of using waste heat recovery. The standby die- use of absorption chillers serving air-conditioning and also sel generator set is always available on an “auto mains failure the thermal energy requirements of the paint tanks’ temperabasis” as per facility requirements. ture control.
40	 ASHRAE	Journal	 ashrae.org	 	 January	 2011
ASHRAE Journal - January 2011

Table of Contents for the Digital Edition of ASHRAE Journal - January 2011
