Acceptance Test Specification of Industrial Cooling Tower
1 Scope
This standard specifies the integrated process of tests for thermal performance, noise and water flow rate of drift loss of industrial circulating water wet cooling tower. It also specifies the measuring methods for parameters, processing method of test data, and the assessment method for test results.
This standard is applicable to the acceptance test for newly-built or renovated wet type industrial circulating water cooling tower with mechanical draft and natural draft. It also can be applied to non-acceptance test for cooling tower.
This standard is not applicable to the acceptance tests for cooling-chimney combined tower, and cooling towers.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, standard sequent amendments to (excluding correction contents), or revisions of, any of these publications do not apply, however, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 3785 Electric, sonic Properties and Measuring Methods for Sound Level Meters
GB/T 7190.1 Glass Fiber Reinforced Plastic Cooling Tower —Part 1: Middle and Small Glass Fiber Reinforced Plastic Cooling Tower
GB/T 7190.2 Glass Fibers Reinforced Plastic Cooling Tower —Part 2: Large Glass Fiber Reinforced Plastic Cooling Tower
GB 12348 Standard of Noise at Boundary of Industrial Enterprises
GB/T 12349 Method of Measuring Noise at Boundary of Industrial Enterprises
GB/T 50050 Code for Design of Industrial Recirculating Cooling Water Treatment
DL 5000 Technical Code for Designing Fossil Fuel Power Plants
3 Terms and definitions
The following terms and definitions are applicable to this standard.
3.1
Circulating water cooling tower
It is referred to a kind of facility used for cooling circulating water. Water shall be delivered into the tower to realize the heat transfer or heat-mass transfer between water and air, so as to reduce the water temperature.
3.2
Wet cooling tower
It is referred to a kind of cooling tower in which air and water directly contact each other and heat-mass transfers run simultaneously.
3.3
Natural draft cooling tower
It is referred to the cooling tower that is ventilated by means of inlet and outlet air-density difference, or natural draught.
3.4
Chimney type natural draft cooling tower
It is referred to the natural draft cooling tower in proper height and with different geometric shapes. Hyperbolic-type chimney is usually used for cooling tower of fossil fuel power plant.
3.5
Mechanical draft cooling tower
It is referred to cooling tower that drafts with fan.
3.6
Counter-flow cooling tower
Water-flow and airflow are opposite in direction in cooling tower, what is to say, the former one flows from top to bottom and the latter one flows from bottom to top.
3.7
Cross-flow cooling tower
In cooling tower, water-flow and airflow flow in cross, what is to say, the former one flows from top to bottom and the latter one flows horizontally.
3.8
Packing
It is referred to a kind of device set in cooling tower, which is used to make water spray as drip or water film with aim to increase water-air contact area and time.
3.9
Packing height
It is referred to the vertical distance from packing superface to subface.
3.10
Packing length
It is referred to the horizon distance between two vertical faces of packing of cross-flow cooling tower.
3.11
Area of water drenching
It is referred to the net area exposes to water and air in cooling tower, which is a part of packing superface.
3.12
Mass water flow per unit plan area of packing
It is referred to the mass flow of circulating water per unit plan area of packing in unit time.
3.13
Distribution system of cooling tower
It is referred to the water distribution system in cooling tower, which is composed of tank, water pipe or pond and spray nozzle.
3.14
Spray nozzle
It is referred to a part of distribution system of cooling tower, which is used to make water splash into petty drip.
3.15
Vertical well for water distribution
It is referred to the well-type structure in counter-flow type natural draft cooling tower, which is used to distribute water in tower to the distribution system.
3.16
Drift eliminator
It is referred to the device set in cooling tower, which is used to intercept and collect drift in outlet airflow.
3.17
Water flow rate of drift loss
It is referred to water flow rate of drift which is carried out of cooling tower by outlet airflow.
3.18
Cooling range
It is referred to the temperature difference between hot water in cooling tower and the cooled water.
3.19
Ambient air dry-wet bulb temperature
It is referred to the air dry-wet bulb temperature measured without the influence of regurgitation of outlet air, which is measured at upwind of cooling tower.
3.20
Inlet air dry-wet bulb temperature
It is referred to air dry-wet bulb temperature measured at the air inlet of cooling tower.
3.21
Air/water ratio
It is referred to the mass flow ratio of dry air and circulating water in the cooling tower. The symbol λ is always used to express the ratio.
3.22
Number of transfer units (NTU)
NTU is referred to performance number of heat-mass transfer ability of liquid distribution including drenching region, packing region and hyetal region under packing. It is also named as transfer number and expressed with Ω or N.
3.23
Coefficient of transfer mass
It is referred to performance number of heat-mass transfer ability of unit volume of cooling tower liquid distribution. It usually is expressed with the symbol Ka or βxv.
3.24
Cell of cooling tower
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 General provisions
5 Preparation works before tests
6 Test for thermal performance of cooling tower
7 Noise test
8 Water flow rate of drift loss
9 Test report
