(44 points) Use the drawings given (Engineering Renovation Plans) to answer the following questions.

(2 points) Identify the method used for RA, i.e., it is using ceiling plenum return or duct return.

(2 points) In the plans, what does mean?

(2 points) Given the equation,

q (Btu/hr) = 500 GPM (EWT LWT)

determine the LWT of the reheat coil located in the VAV box V-1-2.

(8 points) Identify the rooms served by VAV boxes and its associated MAX SA CFM for each VAV box.

VAV Box	Room Served (Room No.)	Max SA CFM
V-1-1	102	980
V-1-2
V-1-3
V-1-4
V-1-5
V-1-6
V-1-7
V-1-8
V-1-9
V-1-10
V-1-11
V-1-12
V-1-13

VAV Box	Room Served (Room No.)	Max SA CFM
V-2-1
V-2-2
V-2-3
V-2-4
V-2-5
V-2-6
V-2-7
V-2-8
V-2-9
V-2-10
V-2-11
V-2-12
V-2-13
V-2-14
V-2-15
V-2-16

(2 points) Do all the VAV boxes have reheat coils? Yes or No?

(2 points) Identify the fan configurations (Draw Thru and Blow Thru) in AHU-1 and AHU-2.

AHU-1: Draw Thru or Blow Thru

AHU-2: Draw Thru or Blow Thru

(2 points) Identify the MERV ratings of the filters used in AHU-1 and AHU-2.

AHU-1: MERV ( )

AHU-2: MERV ( )

(2 points) Identify the EAT and LWT of the heating coil used in AHU-2.

(2 points) Identify the materials used for the roof hoods IH-1 and 2.

(2 points) Are all the Exhaust Fans (EFs) using VFD motors? (Yes or No)

(2 points) Who has the responsibility to install the disconnects of the Exhaust Fans (including EF-1, 2, and 3)?

Electrical Contractor

Mechanical Contractor

General Contractor

Owner

(2 points) Who has the responsibility to install the disconnects of the Unit Heaters (including CUH -1, 2, and 3)?

Electrical Contractor

Mechanical Contractor

General Contractor

Owner

(2 points) According to the mechanical plans, what is the room temperature setpoint for cooling when it is occupied?

(2 points) According to the mechanical plans, what is the room temperature setpoint for heating when it is unoccupied?

(2 points) Is there an economizer control/mode available in these two AHUs? If so, when the economizer control/mode will be on?

(2 points) Flexible duct is very common to use between a typical rigid duct and a diffuser/register as shown below. According to the mechanical plans given, what is the maximum flexible duct length allowed?

3 feet

6 feet

9 feet

12 feet

(3 points) The section view of the OA intake hood is shown below, and briefly describe the function of the 2 deep drip pan.

(3 points) The airflow path for the RA from Yaos office (previous office in Engineering 118) back to the AHU-1 is shown below. Briefly describe the transfer ducts (that penetrate walls), e.g. the one marked in green, including what is the transfer duct for and the reason why it is necessary to use it in this building?