Experimental Study For Key Parameters On The Indirect Evaporative Cooler Cooled By Flanking Rotary Spray Water

As all along the MTR lines are busy city and the main road, it resulted in that it’s hard to find the installation position of cooling tower on the ground of subway station, that must coordinate with surrounding environment, but also satisfy with cooling tower installation environment, therefore, it has the important value of engineering application that developing a kind of special cooler that apply to underground structures such as subway to replace the common cooling tower. Under the premise of the indirect evaporative cooler cooled by flanking rotary spray water instead of traditional cooling tower, this paper use a mechanical transmission device to realize rotary spray water on both sides of heat exchanger, and set up a test platform for testing the performance of evaporative cooler cooled by flanking rotary spray water, it study the influence of various parameters on the performance of evaporative cooler cooled by flanking rotary spray water, it provide the basis for developing this equipment.This paper researchs on the influence on the equipment performance of the distance of the noozle to heat exchanger, the distance of two set of heat exchange coil, single and double side rotating water; Meanwhile, when heat exchanger is arranged successively under three kinds of mode and heat exchange coil is single set and two groups, this paper study on the influence on the performance of the water volume, rotary speed, air temperature, the volume of cooling water in the pipe, cooling water inlet temperature and so on, it shows that:(1)Heat exchanger use rotating water on both sides when compared with unilateral, when heat exchanger is arranged perpendicular to the air flow, it improves heat transfer is by 30.8%, when arranged in parallel flow, heat exchange is increased by 20%. Meanwhile, under the two kinds of arrangement, its performance is affected slightly by the nozzle spacing to heat exchanger and the distance of two set of heat exchange coil.(2)When a single set of heat exchanger is arranged perpendicular to the air flow, air velocity 2.5m/s to 3m/s, heat transfer remains unchanged after increasing to 0.602kw/m2(air velocity is 2.75 m/s), cooling water flux 400L/h to 600L/h, heat transfer remains unchanged after reducing to 0.595kw/m2(water flux is 500L/h); Two set of heat exchanger is arranged perpendicular to the air flow, when the rotational speed of water distribution means and cooling water flux increases, heat transfer increases after reducing, two set of heat exchanger performance improves by 1.96% when compared with a single set.(3)When a single set, two groups of heat exchanger is arranged in parallel flow, when heat exchanger is two set, heat increases after decreasing first with cooling water flux increasing, two set of heat exchanger performance improves by 17.4% than when a single set.(4)A single set of heat exchanger is arranged in its center hole facing to air flow, heat transfer increases after decreasing with increasing of rotational speed; arranged in two two groups, heat transfer decreases after increasing to 0.991 kw/m2 with increasing of rotational speed, i.e. there is an optimum speed 76 r/min. A single set of heat exchanger performance improves by 16.67% than when two set.(5)The primary and secondary effects of various factors on the performance of heat exchanger are not identical under different arrangement, while heat exchanger performance is the best when heat exchanger is arranged in its center hole facing to air flow.