Working principle
For ZNX counterflow evaporative condenser, the fresh air intakes from bottom air inlet, and will become saturated hot air mixed with spraying water as they flow in reverse direction. The heat will be exhausted out by fans，but the water will be collected to water basin for secondary spraying by its special designed drift eliminator. As no infill inside, ZNX counterflow evaporative condenser has much space to enlarge its coil unit heat rejection area, more compact structure and requires less footprint .
Advantage:
1, No infill designed, more compact structure, lower profile, less installation area required, and easy for transport and installation.
2,Suitable to severe environment as its structure muchmore close, which could prevent from sand and dust.
3, Suitable to high temperature fluid, because hot spraying water will not distort PVC fill as no PVC fill designed.
4, Freezing resistance,because there is no PVC fill to slow down spraying water flow speed.
Model Selection
1, Confirm Total System Heat Rejection Capacity: Total System Heat Rejection Capacity = Total latent heat of condensing medium inside + Total heat rejection of condensing medium (For refrigeration system, it could beselected based on system refrigeration capacity)
2, Confirm the design conditions: Condensing Medium, Condensation Temperature, and Wet Bulb Temperature
3, Determine the correction coefficient ‘R’ by lookup correction coefficient table.
4, Determine Corrected Heat Rejection Capacity: Corrected Heat Rejection Capacity = Total System Heat Rejection Capacity * ‘R’ (correction coefficient).
5, Model selection: select the evaporative condenser model
with rated capacity equal to or greater than the Corrected Heat Rejection Capacity.
Example
（Take Ammonia refrigeration as an example）
1, Total Heat Rejection Capacity of the ammonia refrigeration system is 1200 kw. (Total Heat Rejection Capacity = Compressor refrigerating capacity + Compressor shaft power)
2, Operating condition: Condensation temperature 36 ℃, Wet Bulb Temperature 28 ℃.
3, Lookup ‘Correction Coefficient Table for R717’, and get the correction coefficient 1.35.
4, Determine Corrected Heat Rejection Capacity: 1200kw x l. 35 = 1620kw
5, According to ZHX model table of HAC evaporative condenser, select model ZHX-1680 as it’s the smallest one in these models with capacity greater than1620 kw.
Notice
1, The parameters in the datasheet is for reference only.
2, Operating weight is the weight of equipment full of refrigerant, and bottom water tray full of spraying water.
3, For client’s non-standard requirement, customization available.
4, The rated heat rejection capacity in the datasheet is calculated based on following design conditions: Condensing Temperature=37℃，Maximum Wet bulb Temperature=26℃.
Notes:
1.Do not use for construction. This brochure includes data current at the time of publication which should be reconfirmed at the time of purchase
2.All location dimensions for coil connections are approximate and should not be used for prefabrication of connecting piping.
Selection of Evaporative Condenser
Choosing unstructions
1、Determine the system total calories: total row heat medium = tube condensation latent heat of vaporization + cooling medium heat
2、Determine the design conditions: temperature of import and export, condensation temperature and wet bulb temperature ;
3、Check graph, determine the correction coefficient;
4、Determine the correct row heat: = total heat released by correction coefficient;
5、Choose the evaporative condenser:The heat rejection of the chosen type should no less than corrected heat rejection.
Choosing unstructions
1、Determine the system total calories: total row heat medium = tube condensation latent heat of vaporization + cooling medium heat
2、Determine the design conditions: temperature of import and export, condensation temperature and wet bulb temperature ;
3、Check graph, determine the correction coefficient;
4、Determine the correct row heat: = total heat released by correction coefficient;
5、Choose the evaporative condenser:The heat rejection of the chosen type should no less than corrected heat rejection.
Example
（ammonia refrigeration for example）
1、The ammonia refrigeration system total exhaust heat of 1200 kw. (compressor refrigerating capacity + compressor shaft power = total heat released)
2、Operating condition: condensation temperature of 36 ℃, wet bulb temperature 28 ℃.
3、Check graph 1, correction coefficient is 1.35.
4、Calculate the actual load of the condenser:
1200 KW x l. 35 = 1200 KW
5、Check ZHX graph, choose type of ZHX – 1765, and its heat rejection > 1620 kw.
Instructions for choosing a type
1、The value in the graph are just for reference.
2、The running weight of the table equals the weight of equipment plus the refrigerant and the water in the bottom reservoir.
3、To design and manufacture for client’s special requiremengs if necessary.
4、The heat-exchange quantity of nominal conditions in the sheet refers to the data about condensing temperature(TK)=37℃，air inlet wet blub temperature(TS)=26℃.