Table 6.

Cooling tower efficiency at different flow paths.

Case study	Flow path	Equivalent length(m)	Tmax inlet(°C)	Tmax outlet(°C)	Cooling tower range(°C)	Cooling tower efficiency (%)
1	Spiral coil 1 & finned tube	18	42	37.3	4.7	22
2	Spiral coil 2 & finned tube	12	42	37.3	4.7	22
3	Spiral coil 3 & finned tube	8	42	37.3	4.7	22
4	Spiral coil 1 & 2 in series flow	30	42	37.3	4.7	22
5	Spiral coil 2 & 3 in series flow	20	37.5	32	5.5	33
6	Spiral coil 1 & 3 in series flow	26	41	36.7	4.3	22
7	Spiral coil 1 & 2 in parallel flow	15	42	–	–	–
8	Spiral coil 2 & 3 in parallel flow	10	42	–	–	–
9	Spiral coil 1 & 3 in parallel flow	13	42	–	–	–
10	Spiral coil 1 & 2 & 3 in series flow with finned coil	41	35.1	26.82	8.28	59
11	Spiral coil 1 & 2 & 3 in series flow without finned coil	38	35	27	8	57
12	Spiral coil 1 & 2 & 3 in parallel flow with finned coil	16	38.2	31.53	6.67	39

--: experiments were not stable, and data were not acceptable.