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Sample design for buffer tank and reheating
output for LogoFresh fresh water units
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Object designation:
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Date:
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Customer:
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Flamco / HFC Technical
Consultant:
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Help to determine water consumption based on the
type of object
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Type of
object/use
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Depending on the type and
therefore the use of the object, there are different coefficients which
influence the design/calculation.
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Definition for single
consumption
(specified single outlet capacity defined according
to DIN 1988-300)
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l/s
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Σ - mixer taps for baths or
showers (0.15l/s)
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l/s
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Σ - mixer taps, washbasin,
dishwasher (0.07l/s)
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l/s
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Σ - kitchen sink (0.10l/s)
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Total consumption as sum flow
rate according to DIN 1988-300
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l/s
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l/min
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Sum flow rate of all consumers
according to DIN 1988-300
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Total consumption as peak flow
rate (DIN 1988-300)
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l/s
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l/min
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The peak flow rate reduces the
sum flow rate when considering use-dependent concurrency of water draw-off
(∑V˙R). Equation for the determination: VS = a(∑V˙R)b-c
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Number of units
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Caution: For cascading of
LogoFresh unit´s optional cascading sets are required.
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Basic and system parameters
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Proposed
value based on calculation peak.
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Required
draw-off volume for a single unit. Fill in based on peak flow rate of the DIN
1988-300 or as a fixed value / directly entered value
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l/min
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Performance definition of the
entire single unit. Please choose the calculated performance specification
due to the calculation peak (see above in yellow) or set up your own fixed
value (e.g. 55 l/min.)
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Please
select using “Drag & Drop”
Selection of fresh water station with or without drinking water circulation
(yes / no)
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Attention: For reasons of
hygiene, we recommend always using fresh water stations with DHW
circulations.
LogoFresh 100 and 120 are only available with circulations!
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Theor. max. draw-off volume at
38°C mixed water temperature
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l/min
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Theor. max. draw-off volume at
a mixed water temperature of 38°C
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Dropdown choose of the
required hot water temperature
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°C
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Standard: 60 °C
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Cold water temperature
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°C
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Standard: 10 °C
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Temperature difference, hot
water tank
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K
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Heat increase by _Kelvin
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Buffer tank temperature
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°C
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Buffer tank output temperature
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Return line temperature
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°C
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Standard Ø-value = 25°C
Further / other performance depending values please see techn.
specifications in the output tables (return line temperatures may vary the
volume flow for example, depending on the operating mode)
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Buffer tank decrease
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K
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Decrease by _Kelvin
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System parameters
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Max draw-off volume
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kW
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Unit’s mathematical max.
draw-off volume
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Critical draw-off duration
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min
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Standard: 10 min
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Heat source activation time
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min
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Delay
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Buffer tank recharging time
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min
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Standard: 30 min
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Cycle time
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min
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Total duration
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Energy requirements
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Energy requirements for crit.
hot water tank
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kWmin
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Buffer requirement until
boiler start
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kWmin
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Buffer requirement until hot
water tank end
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kWmin
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Reheating output
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Required reheating output
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Kw
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Buffer tank
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Freely available boiler output
performance
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%
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100% with priority switching
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Suggestion for boiler
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kW
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Total
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LogoFresh
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Suggestion
for LogoFresh electronic type (CAUTION: CAN ONLY BE USED
FOR THE HOT WATER OUTLET TEMPERATURES SPECIFIED ON THE RIGHT)
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45
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°C
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at the hot water outlet
temperature of
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50
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°C
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at the hot water outlet
temperature of
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60
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°C
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at the hot water outlet
temperature of
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Buffer tank
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Buffer tank suggestion
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Litres
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Buffer tank type suggestion
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Article no.:
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Sample calculation! You have the responsibility to check the
parameters.
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For the buffer design, only the hot water proportion and the
usage behaviour of standard residential building will be considered. If the
building is used in a different way or system parameters change, the buffer
tank and reheating output must be designed separately.
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All designs without consideration for permanent consumers
(t>15 min), draw-off points V_R> 0,5 l/s and circulation loss.
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