Question 92Refrigeration/AC - Assistant Engineer70% to pass
Which of the following is true concerning the class "A" air conditioning system shown in the illustration as used to condition the air of large public spaces? Illustration GS-RA-09
AI Explanation
The correct answer is A) The dry bulb room temperature is controlled by a steam heated reheater and its associated pneumatic control valve.
In a large public space air conditioning system, the class "A" air conditioning system uses a steam heated reheater to maintain the desired dry bulb room temperature. The reheater is controlled by a pneumatic control valve that is modulated by the room thermostat to add or reduce steam flow as needed to maintain the setpoint temperature.
The other answer choices are incorrect because: B) The reheater is used in both the cooling and heating modes to fine-tune the air temperature; C) The preheater steam flow is not controlled by the space thermostat, but rather by the system controls; and D) It is possible for both the cooling coil and reheater to operate simultaneously to precisely control the air temperature.
Related Questions
#90 To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, what should be done? #91 Which of the following is true concerning the class "D" air conditioning system shown in the following illustration? Illustration GS-RA-42 #93 If outside air at 80 degrees F and 70 percent relative humidity is conditioned, what will be the resulting dew point temperature of the air just before it comes into contact with the cooling coil? Illustration GS-RA-22 #94 Concerning the arrangement of equipment and associated hoses shown in the illustration, what statement is true? Illustration GS-RA-59 #95 Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system?