Research on slotted-pipe diffuser of naturally stratified water-storage tank

The power consumption of air conditioner is the major reason for load peak and off-peak difference in power system, and the cooling storage technology used in air conditioner can improve the power supply and demand. The most popular cooling storage technology in air conditioner is the water stratification method. In this paper, a cuboid water pool is employed to analyze the influence of Reynolds Number (Re), Froude Number (Fr) and water distributor type for the efficiency and improvement of water pool. Experiment data show that: the smaller Fr and the higher water height, the better performance of storage is got under the same Re and water supply temperature. However, the influence of Fr change is less when Re is lower than 200. At the same time, the water pool efficiency is improved for the density increase of the supply and return water under the same water temperature difference. It can be obtained that the increase of temperature difference will enhance the effect of cooling storage in air conditioner.

[1]  William P. Bahnfleth,et al.  Parametric Study of Charging Inlet Diffuser Performance in Stratified Chilled Water Storage Tanks with Radial Diffusers: Part 2–Dimensional Analysis, Parametric Simulations and Simplified Model Development , 2001 .

[2]  John M. Cimbala,et al.  Measured and Modeled Charging of a Stratified Chilled Water Thermal Storage Tank with Slotted Pipe Diffusers , 2003 .

[3]  A. Ghajar,et al.  NUMERICAL STUDY OF THE EFFECT OF INLET GEOMETRY ON STRATIFICATION IN THERMAL ENERGY STORAGE , 1991 .

[4]  Hoseon Yoo,et al.  The effect of diffuser configuration on thermal stratification in a rectangular storage tank , 2008 .

[5]  M. W. Wildin.  Performance of stratified vertical cylindrical thermal storage tanks. II: Prototype tank , 1989 .

[6]  C. R. Truman,et al.  Initial formation of a thermocline in stratified thermal storage tanks , 1986 .

[7]  S. L. Soo,et al.  Model of the transient stratified flow into a chilled-water storage tank , 1997 .

[8]  C. Trueman.  Operating experience with a large thermally stratified chilled-water storage tank , 1987 .

[9]  P. M. Moretti,et al.  A numerical and experimental study of stratified thermal storage , 1986 .

[10]  William P. Bahnfleth,et al.  Parametric Study of Charging Inlet Diffuser Performance in Stratified Chilled Water Storage Tanks with Radial Diffusers: Part 1–Model Development and Validation , 2001 .

[11]  Robert E. Spall,et al.  A numerical study of transient mixed convection in cylindrical thermal storage tanks , 1998 .

[12]  K. Ismail,et al.  Theoretical and Experimental Analysis of Stratified Storage Tanks , 1987 .