Handleiding
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A properly designed storage tank should be added if the system components do not provide sufficient water volume.
By default, the unit is set to have a water temperature setpoint differential in line with Comfort Cooling application
which allows to operate with the minimum volume mentioned in the previous formula.
However, if a smaller temperature differential is set, as in the case of Process Cooling applications where temperature
fluctuations must be avoided, a larger minimum water volume will be required.
To ensure proper operation of the unit when changing the value of setting, the minimum water volume must be
corrected.
In case of more than one installed unit, the overall capacity of the installation must be considered in the calculation
so summing the water content of each unit.
4.12.2 Heating Mode
The heating water content of the systems should have a minimum water amount to avoid excessive decrease of the
water setpoint during the defrost cycle to guarantee the proper environmental comfort.
As a general indication the system water content should not be less than the values deriving from the following fomula:
Single circuit Unit
→ 16
Dual circuit Unit
→ 8
kWnominal = Heating capacity at 40/45°C OAT=7°C
The above rule of thumb derives from the following formula, as the relative volume of water capable of maintaining
the system temperature within an acceptable ΔT (which depends on the heating application) during the defrost
transient:
CC = Cooling Capacity during defrost operation
MDD = Max Defrost Duration
FD = Fluid Density
SH = Specific Heat
DT = Acceptable Water Temperature Differential
The water temperature difference is considered acceptable for the Comfort Heating application which allows to
operate with the minimum volume mentioned in the previous formula.
However, if a smaller water temperature difference is considered acceptable, a larger minimum water volume will be
required.
A properly designed storage tank should be added if the system components do not provide sufficient water volume.
In case of more than one installed unit, the overall capacity of the installation must be considered in the calculation
so summing the water content of each unit.
Note: The indication is intended as a general guideline and not intended to substitute the evaluation made by qualified
technical personnel or by HVAC engineers. For more detailed analysis is better to consider the use of other more
detailed approach.
These considerations refer to the water volume always flowing through the unit. If there are bypasses, branch of the
system that can be excluded, that parts should not be accounted in the water content calculation.
4.13 Calibrating the expansion vessel
expansion vessel’s starting pressure depends on the difference between the level at which the unit is installed and the
highest point in the water circuit, and is calculated as follows:
Pi=0,3+(H/10) (bar)
• Pi Initial pressure
• H Difference between the level at which the unit is installed and the highest point in the circuit
A unit with an onboard pump has a 12 litres expansion vessel with an initial pressure of 1 bar.
Maximum water volume
°
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Productinformatie
| Merk | Daikin |
| Model | EWAT016CZP |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 9712 MB |
