karim Flashcards
Heating and cooling must be controlled to
bench: barbells with 2 45 lbs on and guy using his feet
match load and vary the flow of energy
Interior spaces related to heating and cooling
ceiling and appliances
experience heat gains year-round, owing to lights, appliances, and people.
Perimeter spaces
walls and windows exposed to the outside. Hence, they will need heating during cold weather if the interior gains are not sufficient to compensate for heat losses to the outside.
Large buildings can be served by … or
back extension: with twins
neck systems: with a deer neck
multiple small systems capable of providing either heating or cooling to individual spaces.
larger central systems capable of simultaneously delivering heating and cooling as required by individual spaces
Central systems most often use
pull up bar: with the oven coils on the back.
air-handling units with coils to raise or lower the temperature of air supplied to spaces.
Air systems offer several methods of control to vary the amount of heating or cooling supply
leg raises: door opening and closing
heat and back warming up farts
handling both
Varying the temperature of the air supplied while holding the flow constant
Varying the flow of warm or cold air supplied while holding the temperature constant
Varying both the temperature and the flow of air supplied, or turning the system on or off
Air systems are sometimes combined with
nice deadlift zone: heat from the conference on the wall and sun raining down.
convection and radiation devices for heating.
Zone definition
Count number of thermostats. area for which temperature is controlled by a single thermostat.
example house with one furnace controlled by a single thermostat would be termed a single-zone system.
are rooms and zones the same thing
no there can be several rooms by a single zone
Automation is the
function of having equipment react, without any intervention by an operator, to satisfy preset conditions.
Control occurs when
a signal to the equipment causes the movement or adjustment of a component to produce the desired result.
Equipment is selected predominantly to
provide adequate capacity for the needs of the building under the design conditions, whereas controls and automation make the equipment operate under all anticipated conditions.
Automatic controls accomplish their task by controlling one or more of the following
temp: pressure flow rate humidity speed: on off and variable speed of equipment. time:
Basic Control Systems
Control systems may be electric, electronic, pneumatic, direct digital, or a combination of these.
Pneumatic controls
Were popular until the advent of electronic direct digital controls in the late 1980s and are still in place in many existing buildings.
Pneumatic controls use 5- to 30-psi compressed air and receiver controllers
The receiver controllers constantly adjust output air pressure to actuators in response to input pressure from sensors to produce the desired result.
