The evaluation of energy saving performance for the modular design centrifugal chiller

Yoonjei Hwang,Horim Lee,Kamgyu Lee,Saikee Oh,Youngsu Park,Hanyoung Park,S.I Tanabe,P Wargocki,L Mazzarela,G Cao,M.C Gameiro Da Silva,C Inard,H Zhang,J Kurnitski,I Nastase

doi:10.1051/e3sconf/201911101018

Abstract

The modular concept design and operation of a centrifugal chiller offers the potential of increased cycle efficiency both at full load and off load conditions compared to the single compressor chiller. Modular chiller design is that a smaller, individual chiller can be connected with another, to make a larger capacity system. In the case of a tandem chiller, there would be faced to the higher initial cost or bigger foot print than a single compressor chiller at the same capacity because manufacturing cost, weight and size will be decreased according to increase of the refrigeration capacity. Therefore, it is obvious that a modular chiller have to be improved its efficiency first by both the operation algorithm and major cycle components. Eventually, the efficiency of the modular chiller achieves up to 6% at the full load condition after added series counter flow effect as much as 3% and more 3% added by improved aerodynamic design for impeller. Moreover, maximize off design potential through the capacity combination algorithm as the way of uneven loading makes 24% improved based on AHRI 550/590.

Highlights

The modular concept centrifugal chiller offers easy to capacity expansion, better efficiency and less occufy by the help of technogies, where from the strategy for capacity combination, a smarter operation algorithm and implemented a couple of high efficient components
Modular chiller design is that a smaller, individual chiller can be connected with another, to make a larger capacity system by the ways of parallel or serial combination
By the help of hexagonal arrangement, modular design saves 30% installation area if it compared to two chillers installed at same capacity

Summary

Introduction

The modular concept centrifugal chiller offers easy to capacity expansion, better efficiency and less occufy by the help of technogies, where from the strategy for capacity combination, a smarter operation algorithm and implemented a couple of high efficient components. Modular chiller design is that a smaller, individual chiller can be connected with another, to make a larger capacity system by the ways of parallel or serial combination. By the help of hexagonal arrangement, modular design saves 30% installation area if it compared to two chillers installed at same capacity. There are two practical configurations for multiple chiller application, which can be a serial and parallel way through the same basic module. Basic modules with different capacity can be combined to take better part load performance or get better load matching with customer building. The modular chiller has to be designed by smart ways, where the most of the components are designed efficiently, easy to access to all service components for servicibility by located it at the same side and get less foot print by staggered arrangement to save lands for commercial purposes

Technologies for the modular concept design

Benefits of modular concept design

Findings

Summary