What is the difference between a heat recovery ventilator (HRV) and an energy recovery ventilator (ERV)?
a. The ERV can dehumidify in the cooling mode.
b. The HRV can act as a humidifier in the heating mode.
c. The ERV has a durable metal core.
d. The HRV cannot be used in very cold climates.
a. The ERV can dehumidify in the cooling mode.
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Plot on a graph the CO2 emission for each decade from 1850 to 2050 based on your fossil fuel forecasts of Problem 6-33. Show:
a. Oil b. Coal c. Natural gas d. All CO2 emissions for 1990 from fossil fuel use What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. If you set your alarm clock or clock radio to wake your household in the morning, you have programmed a controller. 2. Input modules sense whether the input devices are on or off. 3. Some output modules are capable of switching starters through size 10. 4. The brain of the programmable controller is the memory. 5. Programming may be accomplished either at the processor site or remote to the processor.
What is the standard airflow across the evaporator of a 3 ton residential split system air conditioner?
A) 1500 CFM B) 1200 CFM C) 1000 CFM D) 800 CFM
The volume of a cylinder is determined by finding the ____________________ of the circle and multiplying it by the height.
Fill in the blank(s) with the appropriate word(s).