lesson 8 review

lesson 8 review - Ch 8 1. Due to convection, a house with...

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Ch 8 1. Due to convection, a house with an electric radiant system and floors with a high thermal mass, can reduce heating costs if the electric company offers "time-of-use" rates. B) FALSE False, an electric radiant system heats through radiation, not convection. 2. Flat plate collectors are usually placed on the roof or ground in the sunlight. They are classified as C ) Active System Flat plate collects are active systems. This is because external energy source is required to pump water thought the plate. 3. A heat mover speeds up a natural heating process. B ) FALSE False, naturally, heat moves from high to low temperature environment. A heat pump goes against nature, moving the heat from a low to a high temperature environment. 4. Solar and GHP heating systems have absolutely no impact on the environment. B ) FALSE False. Both solar and GHP heating systems both require the use of pumps that use electricity. Although the amount is small, it is still electricity, and with generation of electricity, there are emissions. 5. Compared to a house built in the 1960's, a house built today has: A ) A greater R-value Newer houses are well insulated and have greater R-values compared to older houses 6. An active system emits more SO2 directly into the environment than a passive system. B ) FALSE both the active and passive systems use solar energy, which do not directly emit SO2 energy into the environment. 7. Using kitchen and bath exhaust fans may adversely affect the heating and cooling requirements A ) TRUE Kitchen and bath exhaust fans pump the air from inside the house. This leads to increased heating or cooling requirement. 8. Ground Source heat pumps are _______ efficient than air to air heat pumps A ) More Ground source heat pumps are more efficient than air to air heat pumps 9. The work input to a heat pump system is at the B ) Compressor The work input to a heat pump system is at the compressor 10. Opening the drapes of windows on this side of a house will help in heating. D ) south opening the drapes of windows on the south side of a house will help in heating 11. A house that effectively uses passive solar heating and cooling will: C ) Face south and have deciduous trees growing on the south side to block heat in the summer and allow sunlight in the winter. A house that effectively uses passive solar heating and cooling will face south and have deciduous trees growing on the south side to block heat in the summer and allow sunlight in the winter. 12. Forced-air furnace systems distribute heat by: B ) Convection Forced-air furnace systems distribute heat by convection 13. The collector's efficiency increases as: B ) useful energy delivered increases (insolation remains constant) useful energy delivered increases…Based on the equation: Collector's Efficiency = Useful energy delivered/insolation on collector*100, and there fore if the useful energy delivered increases, the collector's efficiency will increase. 14. The compressor of a heat pump system ___________ the pressure of the refrigerant, ________ its temperature.
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lesson 8 review - Ch 8 1. Due to convection, a house with...

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