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There are basically two essential factors in the selection of cooling groups. The first of these is the design outdoor dry bulb temperature of the province where the device will operate, and the second is the desired outlet temperature value.
Cooling groups manufactured without taking these two values into account will not meet your needs. In other words, if these two values are not specified in clear figures in the offer you receive regarding cooling groups, you can be sure that you will have problems with cooling capacity.
If the design outdoor dry bulb temperature and the device outlet temperature values are specified as ranges rather than clear figures or are specified at lower values than they should be, you will face the same problem.
For example, if a company has stated in its offer that it bases its offer on the outdoor temperature of 250C and the outlet temperature of 150C for a device with a cooling capacity of 100 kW, you can only use this device in a city where the outdoor dry bulb temperature is 250C and the outlet temperature is at a maximum of 150C, you can get 100 kW capacity efficiency.
In other words, if you use this device in a city where the outdoor dry bulb temperature is higher than 250C , it is not possible to get 100 kW capacity efficiency.
If the outdoor air temperature is not taken into account in cooling groups;
Although the device appears to have the same capacity, it has a smaller capacity than it should have. Therefore, when you start using it, the cooling capacity will be insufficient.
Let’s explain what we mean with numbers:
| DEVICE MODEL | ALPC 100 | ALPC 100 | ALP 100 |
| COOLING CAPACITY | 100,70 Kw | 108,00 Kw | 101,80 Kw |
| CONDENSER CAPACITY | 122,30 Kw | 140,70 Kw | 174,20 Kw |
| OUTDOOR TEMPERATURE | 250C | 350C | 480C |
| COLD WATER OUTLET TEMPERATURE | 7-120C | 7-120C | 7-120C |
| REFRIGERANT | R 410A | R 410A | R407C |
When we take a cooling group with a cooling capacity of 100 kW as an example, the difference in condenser capacity between the devices increases by 15% in the outdoor air temperature difference of 250C and 350C . In the difference between 350C and 480C outside air temperature, only the condenser capacity difference between the devices increases by 25%.
When we take a cooling group with a cooling capacity of 320 kW as an example, in the difference between 250C and 350C outside air temperature, only the condenser capacity difference between the devices increases by 7%. In the difference between 350C and 480C outside air temperature, only the condenser capacity difference between the devices increases by 23%.
In terms of cooling capacity;
A 100 kW capacity cooling group manufactured based on 250C outside air temperature operates at 43% lower capacity than a 100 kW capacity cooling group manufactured based on 480C outside air temperature. In other words, when you operate a 100 kW capacity cooling group manufactured based on 250C outside air temperature in a province with 480C outside air temperature, you get 57 kW cooling efficiency.
A 320 kW capacity chiller manufactured based on 250C outside air temperature operates at 32% lower capacity than a 320 kW capacity chiller manufactured based on 480C outside air temperature. In other words, when you operate a 100 kW capacity chiller manufactured based on 250C outside air temperature in a province with 480C outside air temperature, you will get 217.60 kW cooling efficiency.
As seen in the examples, if the same model and type of chiller is used at different outside air temperatures, the cooling capacity also changes.
Without fully evaluating the design conditions, you will end up with a product with a much lower capacity than you need when making choices based solely on capacity.
In terms of costs;
A larger condenser capacity in a chiller requires the capacities of the compressor and other cooling equipment to be larger. This creates a serious cost increase in the manufacturing of the system.
Be careful, you may pay much more than necessary when considering purchasing a low-cost chiller below market value. Low cost chillers will leave you with low capacity.
A chiller that you buy without paying attention to the outdoor temperature value and outlet temperature value;
You cannot get the desired efficiency since the cooling capacity will be insufficient.
You will encounter unforeseen damages depending on your process.
Your project will face undesirable negative results.
You will pay much more for the chiller than its real value.
When you request an offer for a chiller, it is not possible to be sure that a company that misleads you by not stating the outdoor temperature value and outlet temperature value in clear figures will act realistically in the other components of the product.
In order not to have problems when purchasing a chiller, you should make sure that the cooling capacity is calculated based on the outdoor temperature value of the province where you will use the chiller and that the outlet temperature value is suitable for your project.
İlker KURAN
Alperen Ltd. Şti