Share

Model-based feedback control of an ammonia-water absorption chiller.

Number: pap. n. 128

Author(s) : GOYAL A., RATTNER A. S., GARIMELLA S.

Summary

In this study, potential control strategies for a small-scale, 3.5 kW ammonia-water absorption chiller are developed and investigated using a dynamic simulation model. The dynamic model is employed to study the response of the system under varying ambient temperatures and cooling load demands. Two strategies are investigated for feedback control of the system. The first control loop maintains the evaporator temperature glide set-point (Tevap,out – Tevap,in), while the second control loop regulates desorption temperature to provide the desired cooling duty and maintain the delivered coolant temperature at a set-point. At design operating conditions, the proposed control for evaporator temperature glide requires ~250 s to reach the set-point of 3°C, starting from ambient conditions. With the proposed implementation of desorption temperature control, the system can respond to changes in ambient temperature and cooling load demand, and maintain the delivered coolant temperature within ±0.75°C of the set-point. At part-load operation, the proposed techniques can increase the system coefficient of performance (COP) by 8% or greater.

Available documents

Format PDF

Pages: 9 p.

Available

  • Public price

    20 €

  • Member price*

    15 €

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Model-based feedback control of an ammonia-water absorption chiller.
  • Record ID : 30013668
  • Languages: English
  • Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
  • Publication date: 2014/03/02

Links


See other articles from the proceedings (125)
See the conference proceedings

Indexing