Gerald Spencer, P.E. Studied and documented the existing HVAC, Electrical Service, Air, Vacuum, Deionized Water, Instrument Air, Steam Supply, Chilled Water Supply, and other services to the laboratory. We documented the present, future, and ultimate requirements for these utilities as required to serve the existing and proposed laboratories, and the future ultimate building utility requirements for these services. Our study documented specific modifications to the building that allowed the building to be fully developed into laboratory space plus the addition of 60,000 SF of new research laboratory space.
LACKLAND AFB HVAC STUDY BUILDINGS 1351, 1250, 1354, 1251, 1355, 6329 and 6359 - Sept, 2002 - Project No. MPLS-00-1062 Lackland AFB, Texas 78236-5253 - Gerald Spencer, P.E. performed a formal study and written report to determine why these recently air conditioned buildings did not control the indoor humidity properly, and was growing mold on the indoor surfaces. We then prepared a report to correct the apparatus configurations so that the systems would have inherent humidity control plus positive humidity control when abnormal conditions occur. Abnormal conditions might be when someone holds the doors open for extended periods of time, or during system startup after a power failure or system shutdown.
1. All of these buildings have extreme mold and mildew problems resulting from the high room relative humidity that is normally present indoors since the HVAC systems replacement. The resulting high relative humidity has caused mold, mildew and rust on the relatively new walls, ceiling grids, the ceiling supply air diffusers, and the return air grilles. Most of these buildings have recently installed new HVAC systems, and the occupants refused to work in these buildings due to the humidity and mold problems.
2. The problem was with the basic design configuration of the recently installed new HVAC apparatus which did not feature inherent humidity control or even positive control for removal of humidity during abnormal or upset conditions. The existing systems will require that the chiller be operated at essentially full load whenever the building cooling requirement is less than 90% of the full capacity for humidity control, and that the boiler also be operated at all times to reheat the room air supply sufficiently to prevent the rooms from getting too cold.
3. The annual operating costs of this system if operated for humidity control would be several times the cost of a modified apparatus with face & by-pass or maybe return air by-pass to the fan section.
4. We proposed to vary the apparatus leaving air temperature by blending dehumidified return air in the draw-through fan section as required to not overcool the occupied space. This will eliminate the reheat requirement. We recommend cutting an opening into the fan plenum and adding a motor operated damper to allow dehumidified return air (RA) to enter the fan plenum without passing through the cooling coil except when it is needed to cool the occupied space, or when dehumidification and reheat is required. We will remove the control valve from the chilled water coil and allow the chilled water coil to circulate uncontrolled and have the cooling coil leaving air temperature to be constant at or below the desired dew point. This removal of the chilled water control valve will also decrease the possibility of wintertime chilled water coil freezing, if the chilled water pumps are operated at all temperatures below freezing. Dehumidification and reheat will not be required except under extreme conditions, such as when someone blocks the exterior doors open. The modified apparatus would have inherent control of the maximum room relative humidity due to the revised configuration with inherent maximum dew point control. Rough estimations for office occupancy for San Antonio gives 2200 full load equivalent hours of cooling capacity operation.
5. The occupants complain that the rooms at the ends of the duct runs of the recently air conditioned "I" buildings have no air flow. The contract MPLS 96-8011 drawings indicate that the ducts were sized at constant friction without using any static regain consideration. Speeding up the fan to overcome the additional static friction from the first air outlet to the last air outlet and would be less expensive than replacing the ductwork with larger ductwork, but would cause additional fan noise in the rooms closest to the fan rooms.
6. The exterior of these wooden framed buildings have been up-graded or dressed up by the application of EFIS on top of the existing exterior wood siding. This was probably intended to change the appearance of these structures and give them the appearance of modern office buildings. EIFS added to new or existing wood substrate sometimes causes the wood to rot and fail. These failures normally occur within eight to ten years. EFIS added to wooden framed structures has caused many failures around the country, and many lawsuits. The moisture trapped behind the EFIS panels in the wood substrate causes the wood substrate to rot. We recommend modifying the existing apparatus to maintain a constant chilled water cooling coil leaving dew point.
In 1998, Gerald Spencer, P.E. performed a study to determine why the plant chilled water would not circulate the water to the buildings properly, and then prepared drawings to correct the piping so that the piping would flow to the buildings in the quantity needed.Type your paragraph here.
Gerald Spencer, P.E. has performed many analyses of small existing HVAC systems for the US Postal Service. Contact Mr. Marshall Cantor (713) 226-3471 with the USPS. SEI has all of the tools & instruments to analyze HVAC systems, and regularly uses these instruments to determine non operation problems, and operational problems with HVAC systems. SEI has corrected small problems if they are easy to fix.
For the Main Post Office in Houston, we replaced an open drive motor, transmission, revised piping for variable chilled water flow, reconfigured plant for primary and secondary pumping, start-up & commissioning, operating procedures, and balancing. SEI has worked on many post offices. Some are listed below.
COLLEGE STATION PO - USPS - CANTOR (713) 226-3471 - REPLACE CHILLER
VIDOR PO - USPS - CANTOR (713) 226-3471 - REPLACE HVAC EQUIPMENT
MEMORIAL PARK STA - USPS - SIMS - REPLACE CHILLER
BAYTOWN MPO COMPRESSOR - SIMS - REPLACE COMPRESSOR
LAKE JACKSON, TX MPO - - USPS - CANTOR - REPLACE HVAC EQUIPMENT
ROY ROYALE STA - - USPS - SIMS - REPLACE HVAC EQUIPMENT
GREENS NORTH STATION, TX - USPS - CANTOR - EMERGENCY GAS LINE REPAIR
LONG POINT STA - USPS - CANTOR - REPLACE HVAC EQUIPMENT
ORANGE, TX MPO - USPS - CANTOR - REPLACE CHILLERS
PASADENA COOLING TOWER REPAIRS - USPS - CANTOR - HVAC R&A REPAIRS
FOSTER PLACE STATION - - USPS - CANTOR HVAC EQUIPMENT REPLACEMENT
DENVER HARBOR STA - USPS - CANTOR - HVAC EQUIPMENT REPLACEMENT
S POST OAK STATION - USPS - CANTOR - HVAC EQUIPMENT REPLACEMENT
MISSOURI CITY STATION - USPS - CANTOR - HVAC EQUIPMENT REPLACEMENT
BEECHNUT STATION - USPS - CANTOR - HVAC EQUIPMENT REPLACEMENT
WESTFIELD STATION - USPS - CANTOR - HVAC EQUIPMENT REPLACEMENT
HOUSTON, TX MPO - - USPS - CANTOR - CHILLED WATER SYSTEM MOD
Gerald Spencer, P.E. performed an analysis of the HVAC system and recommended energy conservation measures such as Variable Volume Chemical Hood Exhaust, Chilled Water Reheat for OSA Make-up, and several other unique HVAC modifications for that project. We performed a study to determine why the plant chilled water would not circulate the water to the buildings properly, and then prepared drawings to correct the piping so that the piping would flow to the buildings in the quantity needed.Type your paragraph here.
Gerald Spencer, P.E. is hands-on experienced with analyzing existing HVAC systems, diagnosing operational problems, and proposing long term and short term solutions to these problems. Our staff of engineers are particularly well acquainted in building operations and communicate very well with operating and maintenance personnel. You will find that our staff is at home with tools and instruments, as compared to the clean hands ivory tower type of engineer. This attitude generally shows through and makes our personnel more compatible with your operating and maintenance personnel. We always take the time to explain any changes in operating and maintenance procedures to your personnel so that they will fully understand and believe in any procedures that we recommend. SEI has extensive experience determining HVAC system requirements. SEI engineers have performed analysis of the HVAC systems listed in detail below.
Gerald Spencer, P.E. has more than 50 years experience serving as the Engineer of Record responsible for the design and construction of the MEP portions of more than 1300 building construction projects since 1968 including more than 30 years of preparing forensic engineering reports. Gerald Spencer, P.E. has also been providing licensed professional engineering expert opinion and testimony concerning HVAC, electrical, plumbing, cryogenics, ventilation, construction contract compliance, construction cost estimating, construction contract acquisition, construction contract administration, and other construction matters for attorneys with since 2001.
Gerald Spencer, P.E. has prepared operation & maintenance manuals for projects that have other than normal operating and maintenance procedures. Normal projects without complicated operating or complicated maintenance procedure requirements can be documented by the construction contractor. SEI specifications always include a maintenance program outline, operational program outline, and other scope requirements so that the contractor fills in the blanks with the equipment that he selects to install, and submits the completed data for the AE review. SEI has extensive experience reviewing contractor prepared O&M plans and manuals. SEI mechanical and electrical engineers are hands-on experienced with analyzing existing HVAC systems, diagnosing operational problems, and proposing long term and short term solutions to these problems. Our staff of engineers (and architects) is particularly well acquainted in building operations and communicates very well with operating and maintenance personnel. You will find that our staff is at home with tools and instruments, as compared to the clean hands ivory tower type of engineer. This attitude generally shows through and makes our personnel more compatible with your operating and maintenance personnel. We always take the time to explain any changes in operating and maintenance procedures to your personnel so that they will fully understand and believe in any procedures that we recommend.
1.713.621.2482 or 1.800.383.9685
4635 Southwest Freeway, Suite 900
Houston, Texas 77027
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