building systems analysis

Question 1

what is energy

I’m on fire

Answer 1

quantity such as heat

Question 2

what is power

football player using his power to knock someone on their asses

Answer 2

the rate at which energy is transferred of energy

Question 3

what is the only unit of measurement in powers with hours at the end of it

Answer 3

Btuh

British thermal unit hours.

Question 4

Using Q=MCTD calculate
10’ x 10’ x8” thick floor warmed to 80 and cools to 70 over night how much heat is released
floor weighs 144 lb Ft^2
.156 btu lb f

Answer 4

100.66=66’^2
66144=9600
9600 lb ft^2.156 btu lb f 10 f= Q
1500 btu

Question 5

what does power equal related to energy and time

Answer 5

energy/time

Question 6

energy is what related to power and time

Answer 6

power* time

Question 7

energy and power related to watters

Answer 7

energy is watt hours

power is watts

Question 8

Heat is measured in

and what is it

Answer 8

British thermal units, or Btus.

amount of heat required to raise a temperature of 1lb of water 1 degree

Question 9

in the equation Q=500GPMTD where does the 500 come from

Answer 9

weight of 1 gallon of water 8.35 *

1 hours or 60 min

Question 10

what systems are used to convert and move fluids to make buildings habitable and functional

Answer 10

mechanical and electrical

Question 11

it takes 15,000 btu to lower a concrete slab from 60 to 50 degrees what is the average capacity of slab over this period of time

Answer 11

15000 btu/8 h= 1875btuh

Question 12

when using fuels to heat a building where is some heat lost to

Answer 12

radiating heat

Question 13

what is air flow measured in

Answer 13

CFM

Question 14

Why can’t you use PSI for air pressure and what is used instead

Answer 14

to small number to use would be created

use inches of water column

Question 15

water flow is measured in

water pressure is measured in

Answer 15

GPM
PSIG and ft of head
(1 PSIG = 2.31 ft of head)

Question 16

what is steam measured in and flow measured in

Answer 16

lb and lb per hour

Question 17

sustainable

Answer 17

having an overall beneficial effect on productivity, health, resources, economics, and the environment. Sustainable design acknowledges responsibility for future as well as current outcomes.

Question 18

LEED

Answer 18

leadership in energy environmental design

Question 19

buildings acount for ?? of overall energy in US and ?? of electrical usage

Answer 19

30 and 60%

Question 20

heat transfer of air equations

Answer 20

standard air pressure .076 specific heat .24 so the equation is

1.1 x CF x TD

Question 21

Conduction

Answer 21

Heat transfer by conduction is proportional to the temperature difference between the warm and cold sides of the building envelope element.

Question 22

ASHARE

Answer 22

American Society of Heating, refrigerating and air conditioning energineers

Question 23

equation is used in calculating heating load to estimate conduction heat loss through a wall, roof, or window.

Answer 23

Q= (atd)/r= UA*TD

Q=btuh
a= area of assembly ft^2
r= resistance )hrft^2/btu)
U= u-factor (BTU/hrft^2 F)

Question 24

what is the U-factor

Answer 24

overall coefficient of thermal transmittance
U is the reciprocal of total resistance R
ie U= 1/ (sum) R

Question 25

absolute humidity

Answer 25

(Humidity-ratio) of the outside air

Question 26

forms of heat lost main 3 and a few others

Answer 26

conduction
infiltration
ventilation

walls below grade and slab on grade

Question 27

Heat gain

Answer 27

conduction
solar effects
outside air loads and internal heat loads

Question 28

TETF

Answer 28

total equivalent temp difference

Question 29

SHGF

Answer 29

solar heating gain factor
represents the amount of solar heat that will enter a clear single-pane window at a given time of year and time of day, facing the specified orientation.

Question 30

SC

Answer 30

shading coefficient

property of the glazing material and accessories such as blinds or draperies.

SC is the ratio of solar heat admitted in comparison with what is admitted by clear single-strength glass, which has a shading coefficient of 1.0

Question 31

when is infiltration lower

Answer 31

during hot weather

Question 32

water pressure is measured in what

air pressure is measured in what

Answer 32

feet of head

inches of water column

Question 33

why are designs tend not to reserve water

Answer 33

water is still relatively inexpensive and doesn;t constitute for price to install sustainable items