『Abstract
The study we present here analyzes the status of the water chiller
energy efficiency standard in China. The national standard, 5+-2004,
which sets the grade and scale of water chiller energy efficiency,
has been implemented for five years and has produced achievements
in energy-saving and emission reduction, which is a basic state
policy in China. This paper presents extensive investigations
on water chiller energy efficiency conducted in 2009 and compares
these results with results from 2003. This analysis shows that
the average energy efficiency level in 2009 was higher than in
2003. Moreover, large units with more than a 5000 kW cooling capacity
have now appeared, and low efficiency units with EERs (energy
efficiency ratios) below 3.8 have been phased out. The standard
should be upgraded every five years. Therefore, this paper proposes
a draft of a new energy efficiency standard. In the draft, thermodynamic
perfectibility η is presented to be used as an indicator instead
of the EER; for η, 0.4 is the minimum allowable value and 0.6
is the maximum value. There is one category of cooling capacities,
from 100 to 2000 kW, in which the energy efficiency has a linear
relationship with its cooling capacity.
Keywords: Water chiller; Energy efficiency standard; Thermodynamic
perfectibility』
1. Introduction
2. Status of water chiller energy efficiency standards
2.1. The national standard GB 19577-2004 (the minimum allowable
values of the energy efficiency and energy efficiency grades for
water chillers)
2.2. Achievements of the present water chiller energy efficiency
standards
3. Extensive investigations on water chiller energy efficiency
3.1. Water chiller energy efficiency in 2003
3.2. Water chiller energy efficiency in 2009
3.3. Comparison of energy efficiency levels in 2003 and 2009
4. Development trends in water chiller energy efficiency standards
in China
4.1. Thermodynamic perfectibility analysis of GB19577-2004
4.2. A concept for the new standard
5. Conclusion
Acknowledgements
Appendix 1
Appendix 2. The concept of thermodynamic perfectibility
References