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Bid Number: P - 341
Bid Title: Maintenance Shop HVAC
Category: Services
Status: Closed
Bid Recipient: Dana Hire

Description:

*PLEASE SEE ATTACHEMENT FOR ADDITIONAL INFORMATION*

MECHANICAL 

The following mechanical portions of this narrative will review the heating, cooling, and ventilation requirements for the proposed maintenance shop facility in Mt. Juliet which is a new ground up construction.  This design should be referenced for preliminary equipment sizes, quantities, and areas served. 

 

The work bay area will be served by (2) new 10-ton DX/gas (propane) air handling units on grade ducted up the exterior with proper weatherproof insulation and penetrated in bay area as high as possible. The new low-pressure duct within the space will be located tight to deck within the trusses of the space to maximize the ceiling height. The runouts and diffusers will follow down the slope of the roof before the end of the run is terminated. New externally insulated duct and diffusers will be required above ceilings 

   To provide proper air turnover rates within the work bay (2) 12’ HVLS fans are to be installed from the structure as high as possible in the roof.  

  One inline exhaust fan is to be provided for the bulk oil room at 400 cfm to provide 4 ACH. An intake louver is to be installed within the interior door to provide the makeup air of for the room. The termination of the exhaust fan is the go through the roof with a roof cap 10’ away from any mechanical intake. 
 
   A 2.5-ton vertical heat pump split located in the locker room. New externally insulated duct and diffusers will be required above ceilings The condensing unit is to be located on grade south of the office and conference room. Manufacturer sized refrigerant piping is to be routed in the most direct route to the indoor A/C unit. 

    A 2.5-ton vertical heat pump split located in the northeast corner of the parts and storage room. The condensing unit is to be located on grade north of the bulk room. New externally insulated duct and diffusers will be required above ceilings. Manufacturer sized refrigerant piping is to be routed in the most direct route to the indoor A/C unit. Condensate is to be routed to the exterior via a condensate pump. 

In the Conference room and Office are to be conditioned with Mitsubishi equipment. The Conference room is to be served by one Mitsubishi ceiling cassette with a condensate pump routed to the exterior to be spilled in landscape. The office unit will be the equivalent as the conference room.  These units are to be twinned together to a single condensing unit located on grade directly next to the condensing for the other portions of the space. 

 One inline exhaust fan is to be provided for the bathrooms at XXX cfm to provide the proper ventilation rate per the 2018 IMC. The termination of the exhaust fan is the go through the roof with a roof cap 10’ away from any mechanical intake. The make-up air is to be provided through the 2.5-ton spilt system unit through the outside air. 

I.   Design Data 

  1. Mechanical 

For calculation of heating and cooling loads, the following design conditions will be utilized: 

 

  1. Outdoor Conditions: 

 

Summer: 95°F dry bulb (db) and 78°F wet bulb (wb) 

(ASHRAE:  2% cooling db and 2% evaporation wb) 

(ASHRAE:  Relative Humidity 30-65%) 

   

Winter: 11°F  

(ASHRAE:  97% heating db)  

 

II. Building Systems 

  1. Mechanical 
  1. Air Handling Systems 

 

  1. (2) 10-ton DX/gas air handling units
    1. Equivalent to Trane YSC120
    2. Total Capacity = 119.0 MBH
    3. Electrical Data = 208v-3 @ 50.1/60 amps

 

  1. (2) 12’ HVLS fans
    1. Equivalent to Greenheck DC-5-12 (12’)
    2. 120-1 and .5 hp

 

  1. (2) Inline Exhaust Fans 
    1. Equivalent to Greenheck CSP-A700-VG
    2. 120v-1 and 4.1 FLA

 

  1. (2) 2.5 DX heat pump splits with electric heat
    1. Equivalent to Trane:
      1.  Indoor – TEM4A0B30 w/7.2kw Elec. Ht.
        • 208v-1 @ 46/50 amps
      2. Outdoor – 4TWR4030 
        • 208v-1 @ 15/25 amps
  2. (1) Mitsubishi Heat pump system with (2) ceiling cassettes
    1. Indoor – TPLA0A012 
      • 208v-1 @ 1/15 amps
    2. Outdoor – TRUZH0241HA
      • 208v-1 @ 17/27 amps

 

 

  1. Air Distribution 

 

  1. The low pressure packaged DX/Gas (propane) A/C units described above will utilize a constant volume, single zone distribution scheme.  These will be single zone units controlled by a space mounted thermostat on wall.   
  2. All supply ductwork located downstream of the split system A/C units and Packaged Rooftop Units will be fabricated and installed as low pressure, 1” pressure classification.  The return, outside air, and exhaust ductwork for the building will be constructed for 2” pressure classification.  The low-pressure return duct will have 1” thick liner installed.  
  3. Supply diffusers, egg-crate type return and exhaust grilles will be used for air distribution in all areas with ceilings and shall match existing. 

 

III. General Systems Specification 

A/B. Mechanical and Plumbing – Division 15 

  1. Basic Mechanical Requirements and Materials 
  1. Work includes labor, materials, tools, and services for a complete installation of equipment and systems contained in the contract documents.  Principle features of the work include:
  1. Heating, ventilating, air conditioning systems, controls, piping and mechanical system installation. 
  2. Roof curbs, intake/exhaust hoods and louvers. 
  1. Air and water test and balance. 
  1. Piping 
  1. Schedule 40 piping is acceptable for cooling coil condensate drain piping and 1 ½” diameter and smaller waste, vent, and drain piping.  Butt-welded, Class 150, steel fittings will be used with piping sized 2 ½” and larger.  Screwed, Class 150, malleable iron fittings are acceptable for 2” and smaller piping.  Steel piping installed with all welded construction, or mechanical coupled (Victaulic) joints will be acceptable for plumbing system piping. 

 

  1. Domestic hot water, domestic hot water recirculating, and domestic cold water, not specifically identified above, as requiring steel pipe, will be Type L, hard copper or pex with brass fitting.  Type K, rolled, soft copper piping is acceptable for all piping installed under floor slabs, and Type M, hard copper piping is acceptable for non-pressurized drain, waste, and vent piping.  Sweat type, wrought copper fittings will be used for installation of all copper piping systems.  Dielectric connections must be provided at all unions of dissimilar metals to prevent unnecessary corrosion.   

 

c.         Propane gas piping will be Schedule 40 black steel. Gas piping at 11 inches water column pressure or less may use screwed fittings. All Gas piping at 2 P.S.I. shall have welded joints. 

 

  1. Mechanical Systems Insulation 
  1. Moisture condensate drains and refrigerant lines shall be insulated with flexible, tubular elastomeric insulation. 
  2. Domestic hot and cold-water piping, and horizontal rainwater leaders shall be insulated with factory formed, fiberglass pipe insulation. 
  3. Ductwork exposed to view including outside air intake and plenums and apparatus casing will be internally insulated with 3 pound per cubic foot density, semi-rigid, foil-faced fiberboard insulation.  Flexible foil-face, blanket type fiberglass insulation, 1 ½” thick with ¾ pound per cubic foot density will be used for all unlined supply and return ductwork concealed from view, make-up air ductwork, and ductwork supplying outside air. 
  4. Manufactured by Trane, Lennox, Carrier, Mitsubishi, or LG. 

 

  1. Fans 

 

  1. Manufacturer to be Greenheck, Loren-Cook, Acme or equal. 
  2. Certify fan performance in accordance with AMCA certified air and sound rating criteria, standard 210, 300 and 301. 
  3. Exhaust/supply fans shall be V-belt driven or direct driven.  Fans shall be complete with weatherproof housing, inlet gravity dampers, outlet screen (where required) and thermal overload protection. 

 

 

  1. HVLS Fans 

 

  1. Manufacturer to be Greenheck, Big Ass Fans, Macroair, or equal. 
  1. Filters 

 

  1. Contractor shall provide complete installation of throwaway and panel filters.  Filters rated at 30% efficient and below shall be tested in accordance with ASHRAE 52-76.  Filter media will be supplied by American Air Filter (AAF), Farr, Cambridge, or approved equal. 

 

  1. Air Distribution

             

  1. All ductwork located downstream of the Split heat Pump Systems and Packaged Rooftop Units will be fabricated and installed as low pressure, 1” pressure classification.  The return and exhaust ductwork for the building will be constructed for 2” pressure classification.  Sound liner will be utilized on all ductwork adjacent to the mechanical rooms to reduce noise transmission.  Sound liner shall be coated to prevent microbial growth and eliminate erosion of insulation fibers.  The low-pressure return duct will have 1” thick liner installed. 

 

  1. Square, architectural panel face, supply diffusers, return and exhaust grilles will be used for air distribution in all areas with ceilings.   Rectangle sidewall diffusers are to be used for locations with exposed ceilings.

 

 The winning bidder will be responsible for pulling the necessary permits and scheduling the inspections. The City of Mt.Juliet will cover all permit cost.

 

Price $ ________________________________________

Company______________________________________

Contact ________________________________________

Contact phone # __________________________________

 

 

*PLEASE SEE ATTACHEMENT FOR ADDITIONAL INFORMATION*

Publication Date/Time:
12/1/2021 8:00 AM
Publication Information:
Maintenance Shop HVAC
Closing Date/Time:
12/15/2021 10:45 AM
Submittal Information:
Dana Hire
Bid Opening Information:
City Hall 2425 N Mt Juliet Rd
Contact Person:
Toby Toombs 615-773-7957
Business Hours:
M-F 8am-5pm
Related Documents:

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