EGEE 102 Quiz 8 The compressor of a heat pump system ___________ the pressure of the refrigerant, ________ its temperature. Answer: increases, raising Flat plate collectors are usually placed on the roof or ground in the sunlight. They are classified as a(an) _____. Answer: Active system What is the most commonly used fuel for residential heating? Answer: Gas Using kitchen and bath exhaust fans may adversely affect the heating and cooling requirements. Answer: True Where there is limited space, a hydronic heating system can be installed vertically. Answer: False. A GHP can be installed vertically if there is limited space. A hydronic heating system must be installed horizontally underneath the floor to be effective. There is no reason to ventilate the attic in the summer if it is well insulated. Answer: False. Ventilating the attic in the summer lets the hot air to escape. What is the typical range for the COP for heat pumps? Answer: 1.5 – 3.5 When a heat pump is used to heat a house in winter, how is the Coefficient of Performance affected as the outside temperature drops? Answer: Decreases Radiant floor systems heat _____. Answer: the entire floor A house that effectively uses passive solar heating and cooling will_____. Answer: Face south and have deciduous trees growing on the south side to block heat in the summer and allow sunlight in the winter. Bleeding air from the pipes of a hydronic radiant baseboard heating system will _____. Answer: Increase efficiency Which one of the following devices may heat as well as cool a house? Answer: a heat pump An active system emits more SO2 directly into the environment than a passive system. Answer: False. Both the active and passive systems use solar energy, which do not directly emit SO2 energy into the environment. A heat pump (heating) with a COP of 2.8 maintains an indoor temperature of 67 degrees F. What is the outside temperature (in oF)? Answer: 67 oF = (67 - 32) 5 / 9 oC = 19.44oC = 19.44 + 273 K= 292.44 K ' 2.8 = 292.44 / (292.44 - tcold)
tcold = 292.44 - 292.44 / 2.8 = 187.99 K = 187.99 - 273 oC = -85.01 oC = (-85.01 x 9 / 5) + 32 oF = -121.02 oF Horizontal loop Geothermal heat pumps are used when there is less space available Answer: False. Vertical loop Geothermal heat pumps are used when there is less space available Using kitchen and bath exhaust fans may adversely affect the heating and cooling requirements Answer: True Which of the following items is used in a passive solar heating system? Answer: Flat plate collectors AFUE stands for _____. Answer: Annual Fuel Utilization Efficiency Which of the following is not true about a geothermal heat pump? Answer: Its cost is a hindrance for their development
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