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How to calculate the number of horses with the flow of the chiller

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The cooling capacity in the cooler is the ability to indicate how many machines or equipment can be cooled. The higher the cooling capacity, the stronger the cooling rate of the object. The cooling capacity depends on the performance of the cooler, the type of medium used and the capacity of the cooler.

Not all chillers have the same cooling capacity, so you have to calculate. In other words, if the cooling capacity cannot be calculated, the cooling capacity of the cooler cannot be accurately grasped, and it is not known whether the desired performance will be achieved. Of course, in some cases (for example, when buying a chiller), the cooling capacity is clearly marked, so calculations may not be necessary. However, there is no doubt that it will be very convenient if the cooling capacity can be calculated.

About the unit indicating the cooling capacity of the chiller

The unit is fixed for the cooling capacity of the cooler. The unit is "Watts". Usually, it will be represented by a single letter "W" instead of Watt and Katakana.

For example, suppose you have a refrigerator and declare that its cooling capacity is 1,000W. This means that the cooling capacity of the chiller is 1,000 watts.

The Watt unit is also used as a unit of power and electricity, but is also used for the cooling capacity of a cooler. Since it represents cooling capacity, it can be said that its usage is the same as power.

Basically, this watt is used as a unit, but in some cases, other units can be used. The unit is kcal/hour. The unit is calories per hour.

Since 1kW is equivalent to 860kcal/h, the unit can be converted, so two units are used respectively.

If kcal/h is used as the unit of cooling capacity, and 860kcal/h is considered as 1kW, it can be replaced with W. Which equipment you can use depends on you, so you can use equipment that is easy to think and understand as the cooling capacity. It is not always in watts.

Finally, let us see how to calculate the cooling capacity (load capacity) of the cooler.

The cooling capacity can be calculated by using a formula and then applying a number. The formula is as follows.

Q = 0.07×Cb×γb×Lb×（Tout-Tin）

Q: Cooling capacity (impossible capacity) [kW]

Cb: Specific heat of circulating water [cal / g℃] *Water is about 1.0 cal / g℃

Yb: Circulating water density [g/m3] *Water is about 1.0 g/m3

Lb: circulating water flow rate [?/min]

TOUT: Load outlet temperature [℃]

Tin: Load inlet temperature [℃]

By applying a specific number to each of these formulas, the cooling capacity of the target refrigerator can be calculated. Let us look at a concrete calculation example.

For example, suppose the load inlet temperature is 20°C, the outlet temperature is 40°C, and the circulating water flow rate is 10 liters per minute. Applying these numbers to the above formula yields 0.07 x 1.0 x 1.0 x 10 x (40-20). The answer is 14, so you know that it is 14kW and the cooling capacity is 14kW. Expressed in kcal/h, 1kW is 860kcal/h, so it is 12,040kcal/h.

If you can use the formula to calculate the cooling capacity in kW, 1kW can be calculated as 860kcal/h, so even if you want to change the unit, you can calculate it immediately. You can use this formula to calculate the cooling capacity of the cooler. Conversely, if you don’t know the formula, you cannot calculate it. If you remember the formula, you can calculate the cooling capacity just by checking the circulating water flow, load inlet temperature and load outlet temperature.

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