Why do low energy radiant heat systems use 20-50% less fuel than conventional heaters?
What will be an ideal response?
1) The exhaust temperature is lower, thus more of the heat of
combustion is used for heating. 2) Conduction heat loss is lower because the
inside to outside temperature differential is lower due to a lower inside operational
temperature.
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The annual flows (lowest one-day flow rate within a calendar year) of two tributaries of a river are expected to be linearly related. Data for a 12-year period are shown below.
 FIGURE 1.png)
Use a spreadsheet to do the following:
(a) Compute the best-fit line using the method of least squares. Use data for the north tributary as the independent variable.
(b) Plot the data and the prediction equation on the same graph.
(c) Compute the correlation coefficient and interpret it.
(d) If the low flow for the north tributary is 150 cfs, what would you expect the flow for the south tributary to be?
Los electrones de la capa externa de un átomo se conocen como electrones _____.
a. libres b. de valencia c. de unión d. formadores de compuestos
The ____ provides the pressure difference needed to force the air into the duct system, through the heat-transfer surfaces in the conditioning equipment, through the grilles and registers, and into the room.
A. blower B. forcer C. compressor D. condenser
Answer the following statement(s) true (T) or false (F)
1. A circuit vent connects to a horizontal drainage branch and vents from two to eight traps or fixtures connected in battery. 2. Plumbing codes are the principal source of assessments in the plumbing licensing examination process. 3. Hot water is potable water that is heated to a temperature of 150ºF or above. 4. General regulations of a plumbing code list a series of miscellaneous requirements for installation of plumbing systems to ensure that the installations conform to the intent of the code. 5. The three major plumbing codes in this country are updated every five years.