㈜대일아쿠아 --- 산업용 및 공조용 냉각탑 제조업체

THERMAL PERFORMANCE TEST< HOME 

THERMAL PERFORMANCE TEST

 

 
 


THERMAL PERFORMANCE TEST



For a thermal performance test, there are certain site requirements that need to be met by the customer. The following list includes the common considerations for a standard tower installation operating on a cooling water system.

1. Taps should be installed for measurement of water temperatures if required. Hot water temperature shall be measured in the riser pipes. The cold water temperature is normally accomplished at the discharge of the circulating water pumps. The most common location is at the pressure gauge tap present on most systems.

If this is not available or applicable on a system, special taps or another solution must be identified. Measurement in a tower basin is not acceptable. Measurement of cold water temperature in a flume or channel can sometimes be accomplished with acceptable accuracy, but specifics should be reviewed.

2. Power for test instruments available adjacent to the tower. This should be single phase, 2200 volt, 60 cycle.

3. The tower should be ready for testing before the test engineers arrive. The following considerations are important to evaluate the full capability of tower:

a. Towers with PVC film-fill should be operated at design water flow and heat load for 1000 hours prior to doing a performance test. The reason for this is to wash lubricants used in the production of the PVC from the surface of the fill and to protect the separation of water from the surface of fill due to the surface tension. These lubricants inhibit the wetability, and heat transfer capability of the fill.
For additional information refer to the Cooling Technology Institute paper TP00-01 - "Design Features of Cross-Fluted Film Fill and Their Effect on Thermal Performance". The work shows that film fill requires about 2 to 3 weeks of seasoning in their "aging tank". They indicate that one week in the aging tank was equal to about four weeks of tower operation, which means about 8 weeks (1344 hours) of seasoning time in the tower to get the full capacity of the fill performance.

b. The tower should be clean. The water distribution system should not have any damaged, missing, or plugged nozzles or orifices. The water distribution system should be balanced between the cells. The air inlet should be cleared of any blockage. If the tower has adjustable louvers, they should be in the normal design position. The eliminators should be free of foreign matter. Fan discharge should be clear and unobstructed.

c. Water flow and heat load to the tower, or representative cells, should be as close to design as the system will permit. If the code recommended limitations cannot be met, all parties should review the situation to agree on the deviation or delay/cancel the test.

d. Any water by-passes should be closed and inspected to ensure there is no leakage..

e. Any source of air leakage should be closed/blocked. Examples: access doors, or holes in the casing or fan cylinders.

f. All fans must be operated on full speed forward during the test period.

g. The owner or his representative should appoint an electrician or qualified operator available to assist in the measurement of fan power on mechanical draft towers. A wattmeter is normally used to measure fan motor power at the starters or other suitable location.

h. All parties to the test should be advised in advance of any special safety issues required at the site. This includes training, equipment, testing, or restrictions.