Rinnai INFINITY REU-3203W, Руководство по обслуживанию

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Infinity REU-3203W - 4 - ©Rinnai
3. Water Flow Rates and Pressures
Water Flows
Table 1 shows unmixed and mixed water flow rates and approximate gas consumptions for various
temperature rises. The unmixed flow rates are the flow rates available at the given temperature rise
directly at the outlet of the water heater. The mixed water flow rates are available at the given
temperature rise by mixing hot water from the outlet of the water heater with cold water from the
mains supply.
Water Flows can also be calculated by the following formula:
M = 60 x ( Q / C x T )
Where M = Water flow rate in litres/minute. If M is
≤
to 32, the water is unmixed. If M is
>
32, the
water is mixed.
Q = Heat energy available in kW = 56kW for the REU3203W
C = Specific heat of water = 4.2KJ/Kg C. C does not change for the purpose of this calculation.
T = Temperature rise required ( C)
Example:
What is the flow rate available with an incoming water temperature of 10 C and a required
temperature of 20 C?
T = 20 - 10 = 10 C
Q = 56
C = 4.2
M = 60 x ( 56 / (4.2 x 10) ) = 80 l/min. Since 80 is greater than 32, this flow rate is mixed. This result
corresponds with the value in Table 1.
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