How much energy (units of BTU) does an HVAC heating unit need to add to 5,000 ft³ of air at 55°F and 70% RH in order to condition it to 80°F and 60% RH?
Added by Ana S.
Your feedback will help us improve your experience
Adi S and 75 other Physics 101 Mechanics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
a) An air conditioning unit cools 50 (ft)^3/s of air from 94°F to 68°F. What is the required heat transfer rate in (Btu)/s? b) Rework Part (a) for a flow rate of 1.5 m^3/s, a temperature change from 35°C to 25°C, and units of kJ/s?
Adi S.
The celling of a room has an area of 125 $\mathrm{ft}^{2}$ . The ceiling is insulated to an $R$ value of 30 (in units of $\mathrm{ft}^{2} \cdot \mathrm{F}^{\circ} \cdot \mathrm{h} / \mathrm{Btu} )$ . The surface in the room is maintained at $69^{\circ} \mathrm{F}$ , and the surface in the attic has a temperature of $35^{\circ} \mathrm{F}$ . What is the heat flow through the ceiling into the attic in 5.0 $\mathrm{h} ?$ Express your answer in Btu and in joules.
An electric heater is used to heat a room of volume 62 $\mathrm{m}^{3}$ . Air is brought into the room at $5^{\circ} \mathrm{C}$ and is completely replaced twice per hour. Heat loss through the walls amounts to approximately 850 $\mathrm{kcal} / \mathrm{h}$ . If the air is to be maintained at $20^{\circ} \mathrm{C},$ what minimum wattage must the heater have? (The specific heat of air is about $0.17 \mathrm{kcal} / \mathrm{kg} \cdot \mathrm{C}^{\circ} . )$
Recommended Textbooks
University Physics with Modern Physics
Physics: Principles with Applications
Fundamentals of Physics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD