How to calculate kW requirements for typical heater applications?

To calculate the KW required to maintain the temperature of a tank you will need to determine the tanks surface area, process temperature to be maintained, minimum ambient temperature and the R-value of the insulation. Surface area: Round tank –. A (ft²) = (2 x p x r x h) + (2 x p x r²) p = 3.14. r = radius (ft)

How to calculate CFM for typical heater applications?

Note that CFM is given at standard conditions (SCFM): 80° F and normal atmospheric pressure of 15 psi. The CFM at a higher pressure (P) and inlet air temperature (T) may be calculated as follows:

What’s the minimum temp for a water heater?

A 4’ x 6’ x 12’ tank with 1800 gallons of water needs to be heated from 60°F to 95°F in 3 hours. The tank has R-4 insulation and the minimum ambient temperature is 0°F. To begin we need to convert the gallons of water to pounds:

Do you need a variance for a solar water heater?

Multi-family dwellings (duplexes, triplexes, apartment buildings, and condominiums) are not required to have solar water heaters. Therefore, multi-family dwellings do not require a solar water heater variance if a solar water heater is not to be installed.

How to request a variance for a home in Hawaii?

ARCHITECTS and MECHANICAL ENGINEERS licensed to do business in the State of Hawaii requesting variance for new, single-family dwellings (which includes Accessory Dwelling Units and similar single-family dwellings), built in the State of Hawaii, may use this service for the submittal of requests.

Can a variance be used for drinking water?

Rule Summary. Variances allow eligible systems to provide drinking water that does not comply with a National Primary Drinking Water Regulation (NPDWR) on the condition that the system installs a certain technology and the quality of the drinking water is still protective of public health.

When do you need a general variance for a NPDWR?

General variances are intended for systems that are not able to comply with a NPDWR due to their source water quality and there is no feasible alternate source of water.