Optimization of structure and operation parameters in solar energy storage water tank with hemispherical top and internal staggered obstacle

doi:10.19799/j.cnki.2095-4239.2019.0219

Abstract

Abstract:

To optimize the structure and operating parameters of solar hot-water storage tanks, this study numerically analyzes 25 tanks with different obstacle structures. The temperature difference between the cold and hot water outlets decreased with increasing vertical spacing of an obstacle with the same horizontal extent, but it was not obviously affected by increasing the horizontal extent of an obstacle with fixed vertical spacing. The temperature was increased below the obstacle, forming a stable thermal-stratification structure in the solar hot-water storage tank. When the vertical distance between the two obstacles is 0.01 m and the horizontal extension of the left and right obstacle is 0, the maximum instantaneous efficiency of the collector is 20.5%. When the temperature at the hot-water inlet increased, the temperature at the hot-water outlet became more sensitive to the flow velocity at the cold-water inlet. Increasing the inlet cold-water velocity first increased and then decreased the effective heat-storage rate of the hot-water storage tank. The maximum effective heat-storage rates in hot-water storage tanks with different structures varied because of the changing inlet velocities of cold water. To increase the temperature difference between the outlets, the solar hot-water storage tank should have a hemispherical top and internal staggered obstacles, rather than a conical top and a single internal obstacle with one hole.

Key words: solar water storage tank, thermal stratification, staggered obstacle, effective heat storage rate, operation parameters, numerical simulation

CLC Number:

TU 822

WANG Ye, LIN Huxiang, HU Yue, WANG Miao, LIN Yuanshan. Optimization of structure and operation parameters in solar energy storage water tank with hemispherical top and internal staggered obstacle[J]. Energy Storage Science and Technology, 2020, 9(3): 942-950.

Figures/Tables 18

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Table 1

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模型编号	1^#	2^#	3^#	4^#	5^#	模型编号	6^#	7^#	8^#	9^#	10^#
a	0.21	0.23	0.25	0.27	0.29	a	0.20	0.20	0.20	0.20	0.20
b	0.20	0.20	0.20	0.20	0.20	b	0.21	0.23	0.25	0.27	0.29
Δh_L	0.01	0.03	0.05	0.07	0.09	Δh_R	0.01	0.03	0.05	0.07	0.09

模型编号	11^#	12^#	13^#	模型编号	14^#	15^#	16^#	17^#	18^#	19^#	20^#	21^#	22^#	23^#	24^#	25^#
a	0.23	0.23	0.23	a	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20
b	0.20	0.20	0.20	b	0.23	0.23	0.23	0.25	0.25	0.25	0.27	0.27	0.27	0.29	0.29	0.29
Δh_L	0.03	0.03	0.03	Δh_R	0.03	0.03	0.03	0.05	0.05	0.05	0.07	0.07	0.07	0.09	0.09	0.09
c	0.60	0.70	0.80	c	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50	0.50
d	0.50	0.5	0.50	d	0.60	0.70	0.80	0.70	0.70	0.80	0.60	0.70	0.80	0.60	0.70	0.80
ΔL_L	0.10	0.20	0.30	ΔL_R	0.10	0.20	0.30	0.10	0.20	0.30	0.10	0.20	0.30	0.10	0.20	0.30

工况	入口温度/K		入口流速/m·s^-1
工况	热水	冷水	热水	冷水
1	333	303	0.05	0.1
2	333	303	0.05	0.3
3	333	303	0.05	0.5
4	333	303	0.05	0.7
5	333	303	0.05	0.9
6	343	303	0.05	0.1
7	343	303	0.05	0.3
8	343	303	0.05	0.5
9	343	303	0.05	0.7
10	343	303	0.05	0.9

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