Controle de Vazão para Chillers de Absorção Usando o Par H2o/Libr Acionados por Bombas de Reciculação de Baixa Potência (Flow Control for Absorption Chillers Using the Par H2O / LiBr Driven in Recirculation Pumps of Low Power)

Kleber Cézar (kleber_21m4@hotmail.com)2, Allyson Macário (allysson_macario@yahoo.com.br)1, Carlos Antonio Cabral Dos Santos (carloscabralsantos@yahoo.com.br)2, Alvaro Ochoa (ochoaalvaro@hotmail.com)3, José Carlos Charamba Dutra (charamba@gmail.com)4


1Instituto Federal da Paraíba - IFPB /Universidade Federal da Paraíba - UFPB
2Universidade Federal da Paraíba - UFPB
3Instituto Federal de Pernambuco - IFPE/Universidade Federal de Pernambuco - UFPE
4Universidade Federal de Pernambuco - UFPE

This paper appears in: Revista IEEE América Latina

Publication Date: April 2016
Volume: 14,   Issue: 4 
ISSN: 1548-0992


Abstract:
This paper proposes an effective method of variation of speed in the recirculation pump and consequently ensure optimum range of flow for absorption chillers when it uses the pair H2O / LiBr. These systems operate at subatmospheric pressures, merely for this reason the use of non-invasive flow measurement methods. The need for low power recirculation systems in such devices makes it impossible to adopt three-phase loads on the driven of the pumps. These implications prevented the achievement of advances in these systems, limiting the success of important contributions in the literature. Due this, it was designed an experimental apparatus reproducing the flow conditions which are submitted to absorption chillers with H2O / LiBr and developed a device that could changing the low power load speeds. It was implemented in LabVIEW language, a PID controller action system, which allowed tested to the flow control, initially for water and then to the saline H2O / LiBr.

Index Terms:
Cooling, absorption, PID Control, Flow   


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