Studies on Steam Absorption Chillers Performance at a Cogeneration Plant

Abstract

Abstract. Absorption chillers at cogeneration plants generate chilled water using steam supplied by heat recovery steam generators. The chillers can be of either single-effect or double effect configuration and the coefficient of performance (COP) depends on the selection made. The COP varies from 0.7 to 1.2 depending on the types of chillers. Single effect chillers normally have COP in the range of 0.68 to 0.79. Double effect chillers COP are higher and can reach 1.2. However due to factors such as inappropriate operations and maintenance practices, COP could drop over a period of time. In this work the performances of double effect steam absorption chillers at a cogeneration plant were studied. The study revealed that during the period of eleven years of operation the COP of the chillers deteriorated from 1.25 to 0.6. Regression models on the operation data indicated that the state of deterioration was projected to persist. Hence, it would be recommended that the chillers be considered for replacement since they had already undergone a series of costly repairs.

A Novel Design of a Solid Oxide Fuel Cell-Based Combined Cooling, Heat and Power Residential System in the U.K.

“…• The effectiveness of the counter-flow heat exchangers [28] and the coefficient of performance (COP) of the absorption chillers [29] are assumed to be between 0.4 and 0.8. The COP of the heat pump is taken as 3 [30].…”

Techno-economic feasibility of trigeneration systems with Thermal storage: The impact of the load size and spark spread rates

“…cooling. This study considers a COP of the vapor-compression chiller equal to 4.5 [57], [58] and 0.8 for the absorption chiller [59]. Regarding the Spark Spread rate, it varies in four levels SS = {3.0, 3.9, 5.4, 6.6}.…”

“…On the contrary, Absorption and Heat Scrap are small when cooling loads dominate. Because in those cases there is a preference for vapor-compression chiller, due to the large difference in COP (4.5 for vapor-compression [58] and 0.8 for absorption [59]).…”