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Hot Water Storage Tank Sizing Formula:
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Hot water storage tank sizing is the process of determining the appropriate volume of a storage tank needed to meet hot water demand based on heat input, operating hours, and system efficiency. Proper sizing ensures adequate hot water supply while optimizing energy usage.
The calculator uses the formula:
Where:
Explanation: The formula calculates the required storage volume by multiplying the heat input by operating hours and dividing by the system efficiency to account for energy losses.
Details: Correctly sizing a hot water storage tank is crucial for ensuring adequate hot water supply, optimizing energy efficiency, preventing unnecessary energy waste, and reducing operational costs. An undersized tank may not meet demand, while an oversized tank increases initial costs and standby heat losses.
Tips: Enter the dump load in BTU/hr, operating hours, and system efficiency (typically between 0.7-0.95 for most systems). All values must be positive numbers with efficiency between 0.01 and 1.0.
Q1: What is dump load in this context?
A: Dump load refers to the heat input rate to the storage system, typically measured in BTU per hour (BTU/hr).
Q2: How do I determine the efficiency value?
A: Efficiency depends on your specific system. Typical values range from 0.7-0.95. Consult your equipment specifications or a professional for accurate values.
Q3: Can this calculator be used for solar thermal systems?
A: Yes, this formula is commonly used for sizing storage tanks in solar thermal hot water systems.
Q4: What factors affect tank sizing besides the calculated volume?
A: Peak demand patterns, temperature requirements, stratification efficiency, and future expansion plans should also be considered.
Q5: How often should I recalculate tank size?
A: Recalculate whenever your hot water demand changes significantly, or when upgrading or modifying your heating system.