Date of Publication:2011-01-01

Journal:大连理工大学学报

Affiliation of Author(s):建设工程学部

Volume:51

Issue:5

Page Number:701-706

ISSN No.:1000-8608

Abstract:Correlation model of head, efficiency and power in connection with flow
   and speed for variable speed pump in heating and air-conditioning system
   was built. According to the operation characteristics of parallel pumps,
   the optimal allocation situation of speed ratio of parallel pumps when
   total pump power attains its lowest level was theoretically analyzed
   with reference of flow of best efficiency point and speed ratio range.
   Based on a series of parallel pump operating conditions in a typical
   variable water flow air-conditiong system with variable differential
   pressure setpoint control, pump energy saving potential was evaluated by
   simulation under four control strategies, including one pump running at
   full speed and another pump running at variable speed, two pumps running
   at variable speed with 0. 05 speed ratio difference, 0. 1 speed ratio
   difference and the same speed ratio, respectively. Theoretical analyses
   and simulation results show that the speed ratio difference leads to
   extremely low efficiency of one pump or several pumps. It is concluded
   that the operation strategy with parallel pump running at the same speed
   ratio is the optimal choice to attain maximum pump saving potential.

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