Term
| What does ASHRAE stand for? |
|
Definition
| American Society of Heating, Refrigeration and Air-Conditioning Engineers |
|
|
Term
| thermal comfort according to ASHRAE |
|
Definition
| "condition of mind which expresses satisfaction with the thermal environment" |
|
|
Term
| how heat is dissipated to environment (body heat flow) |
|
Definition
| convection, conduction, radiation, evaporation (no heat loss at 98.6F) |
|
|
Term
| 4 conditions of environment that affect comfort: |
|
Definition
1. air temperature
2. relative humidity
3. air movement
4. mean radiant temperature |
|
|
Term
| comfort range for AIR TEMP. |
|
Definition
68-78F
(above 98.6F, heat flow reverses and body gains heat) |
|
|
Term
| comfort range for RELATIVE HUMIDITY |
|
Definition
should be above 20% ALL YEAR, MAXIMUM OF 80%
(low humidity can absorb moisture from skin, @ 100% humidity, evaporation stops) |
|
|
Term
|
Definition
asset in the summer, liability in the winter (wind-chill factor)
affects heat loss rate to both convection and evap. |
|
|
Term
|
Definition
| undesirable local cooling of the human body by air movement |
|
|
Term
|
Definition
| should match air temp. for maximum comfort |
|
|
Term
|
Definition
| describes combined effect of temperature and its coincident humidity |
|
|
Term
| how to read PSYCHROMETRIC CHART |
|
Definition
to the right: hotter
to the left: cooler
going up: wetter (more humid)
going down: dryer |
|
|
Term
|
Definition
| shift comfort zone to the RIGHT |
|
|
Term
| increase in PHYSICAL ACTIVITY |
|
Definition
| shift comfort zone to the LEFT |
|
|
Term
|
Definition
| combines design strategies with psychrometric chart |
|
|
Term
| reading BIO-CLIMATIC CHART |
|
Definition
PASSIVE/ACTIVE SOLAR: low temp and fairly low humidity
CONVENTIONAL AC: high temp and high humidity
INTERNAL GAINS: ok @ 55-68F
HIGH THERMAL MASS: 68-95F, night flush at temp above 95F |
|
|
Term
| wet bulb temp in PSYCHROMETRIC CHART |
|
Definition
(diagonal lines)
this temp. describes the amount of moisture in an air sample |
|
|
Term
|
Definition
| ambient air temperature as measured by a standard thermometer |
|
|
Term
|
Definition
| measured by a thermometer with a wetted bulb |
|
|
Term
| what happens at 100% relative humidity with dry and wet bulbs? |
|
Definition
| they have the same temperature |
|
|
Term
|
Definition
|
|
