university of kentucky good samaritan hospital generator

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University of Kentucky – Good Samaritan Hospital

Generator Configuration Study

12/19/2019

EXISTING EMERGENCY POWER PLANT

Good Samaritan Hospital presently utilizes two 750KW diesel generators. These are connected so that

each generator supplies approximately one half of the facility load, but each may supply the entire load

in the event of a failure. This is done by automatic switching; the generators do not operate in parallel.

In order to maintain redundancy in the generation the total load of the facility must be kept below 900

Amps. This limit will allow operation at 80% of the nameplate capacity and maintain some reserve for

varying loads and inrush from randomly starting equipment.

The hospital performs monthly test of their generators. These occur between 3:00 AM and 5:00 AM.

Data from these tests indicate that the peak measured load between July 2017 and June 2019 was 647

Amps. Typical loads from these tests are around 600 Amps. Since this data is taken during the early

morning, it does not capture the true peak power demand. Areas such as operating rooms and imaging

are not in use during these tests.

Projects are underway to reconfigure an emergency feeder from an underutilized Xray machine to a new

unit, and to repurpose an unused emergency CT feeder to a new IR suite. Miscellaneous renovation

projects are expanding the availability of emergency receptacles to conform to present standards.

These loads are not reflected in the monthly test data. We anticipate that there is between 100 Amps

and 200 Amps of potential emergency power demand with this change. The hospital is also in the

process of installing a new 1.5T MRI unit which will be connected to the generator. The connected load

of this equipment is 220 Amps. These known changes will take all remaining generator capacity and will

likely require some of the reserve.

The hospital would like to provide emergency operation for a new 3T MRI. Connected load for the MRI

is approximately 250 Amps. Another priority is to provide limited space cooling to patient care areas.

Additional cooling loads will be up to 500 Amps as discussed below.

With the current construction at Good Samaritan Hospital, the emergency power plant is at capacity. In

order to accommodate growth and modernization efforts the generator facility needs to be expanded.

After reviewing the existing installation and exploring several options we recommend reconfiguring the

existing generators and supplementing them with a third unit. These should be paralleled to make the

best use of capacity and provide for redundancy. In order to electrically connect the new and old units,

the alternator pitch of all units must be identical. The existing Good Samaritan generators are

“optimum pitch” wound. Because of this winding the new generator must be a custom-wound machine.

The design engineer must specify this requirement in the construction documents. The design team will

have to consider Architectural and Structural modifications as outlined below.

Rev 12/23/19

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PREFERRED GENERATOR ADDITION

Add a new interior 750KVA generator and connect in parallel with the existing two. In this

configuration, two generators will support the facility. The third generator will be redundant and allow

for routine maintenance without compromising the emergency operation of the hospital. Design

capacity will be 1800A at 480V. This additional generator may be placed in the existing paint shop and

two adjacent storage areas. Refer to the attached preliminary layout. The following items discuss the

major points for this approach.

1. Cooling and combustion airflow need to be added. This will require approximately 9’ x 9’ intake

and exhaust penetrations in the building. Options for this are:

a. Discharge through end wall - This is the preferred solution and is the best fit within the

space. The adjacent wooden storage building will have to be removed or relocated.

b. Intake on roof - This will require a 2hr rated shaft and ducting through the 2nd floor

storage area.

c. Discharge through back wall - This direction is directly adjacent to the dorm and

presents a noise concern. It also takes more room for ducting unless a remote radiator

is used.

d. Discharge through roof - This will require a 2hr shaft and ducting up through the 2nd

floor storage space. The discharge must be remote from the intake which will require

additional space.

e. Remote radiator on roof - Increased noise. More difficult maintenance. Weight and

access concerns for the roof.

2. This configuration will need to create an opening in the building to install generator and gear.

The location depends on the louver discussed above.

3. The interior walls of the paint shop and storage will need to be reconfigured. Equipment access

and Code required egress must be provided. The room must be 2 hour fire resistive rated. The

existing column will have to be accounted for in the equipment layout.

4. The proposed area does not extend over the basement so structural concerns are minimal.

5. Additional fuel capacity will be required to meet on-site storage requirements. The existing 2000

gallon above-ground tank will only supply two generators at full load for 16 hours.

6. Provide a new paralleling switchboard with new control and output breakers.

a. Remove ATS1 and ATS2. Refeed E/SWBD1 and E/SWBD2 from the new paralleling gear.

b. Provide new 800A ATS in chiller plant.

c. Provide new load bank connection.

d. Drawout style breakers with spare breakers and cubicles for future expansion,

maintenance and failure recovery.

e. Tridium BMS interface for generator monitoring.

7. The existing transfer switches are not monitored by the BMS. To expedite troubleshooting

these should report status and control faults back to the medical campus Tridium system.

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8. Anticipated construction cost: (Costs do not include construction contingency, design fees,

administrative or other project costs.)

a. Generator and Switchgear Equipment $695,000

b. Generator and Switchgear Installation $335,000

c. Building modifications $155,000

ALTERNATE GENERATOR ADDITION

Another possible solution is to add new exterior 750KVA generator and connect in parallel with the

existing two. In this configuration, two generators will support the facility. The third generator will be

redundant and allow for routine maintenance without compromising the emergency operation of the

hospital. Design capacity will be 1800A at 480V.

1. Install the generator with a walk-in sound attenuating enclosure on east side of Chiller Building.

This will take several parking spaces. Approximate size is 10’ x 25’.

2. Paralleling gear will fit within the paint shop, leaving the end storage room available for other

use. The former Paint Shop must be 2 hour fire resistive rated (NFPA 99). The existing column

will have to be accounted for in the equipment layout.

3. The new generator can be supplied with a sub-base fuel tank, but additional capacity is still

needed in main tank since two generators will potentially draw from it.

4. Provide a new paralleling switchboard with new control and output breakers.

a. Remove ATS1 and ATS2. Refeed E/SWBD1 and E/SWBD2 from the new paralleling gear.

b. Provide new 800A ATS in chiller plant.

c. Provide new load bank connection.

d. Drawout style breakers with spare breakers and cubicles for future expansion,

maintenance and failure recovery.

e. Tridium BMS interface for generator monitoring.

5. The existing transfer switches are not monitored by the BMS. To expedite troubleshooting

these should report status and control faults back to the medical campus Tridium system.






PROPOSED COOLING MODIFICATIONS

The University would like to provide limited cooling during power outages. This will be focused on AHUs

supplying the Operating Rooms, Radiology and Emergency. Most patient rooms are equipped with

individual fan coil units, making these spaces costly to connect to emergency power. The North Wing

addition was constructed with emergency power to the fan coils and will remain as such. To provide

some measure of temperature and humidity control in these rooms we recommend moving the outside

air unit to generator power.

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1. Good Samaritan utilizes three chillers for cooling. Two 500 ton and one 345 ton. 500 tons of

capacity will be reconnected to the expanded generator plant.

2. A new 800A automatic transfer switch will be provided to pick up selected chiller plant

equipment. The switch will be located in the utility plant.

3. Due to maintenance concerns, both 500 ton chillers will be connected to emergency power,

however only one will be allowed to operate at a time. The primary and condensate pumps

associated with both large chillers will be similarly connected. This selection will be managed

through the BAS system.

4. One cooling tower fan will be connected to the new emergency distribution.

5. Affected BAS system panels will be connected to the new emergency distribution to ensure

operation during a utility outage. Panels not equipped with a UPS will be provided with one.

6. Secondary chilled water pumping is located in the main hospital. Based on initial research and

conversations the following pumps will be connected to the existing main building emergency

distribution.

a. PU-13 serving the 5th floor operating rooms.

b. PU-19 serving patient room outside air.

c. PU- 21 serving radiology and operating rooms.



a. Cooling emergency power $245,000

PROPOSED MRI MODIFICATIONS

The University has also requested that the upcoming 3.0T MRI be added to emergency power. It will

initially be connected to utility power only, but provisions were made to convert it to generator power

when the capacity is available.

1. This change will require adding cable to a spare conduit and revising the MRI power conditioner

connection.



a. MRI emergency power $25,000

COST SUMMARY FOR PREFERRED OPTION

Anticipated construction cost: (Costs do not include construction contingency, design fees,





d. Cooling emergency power $245,000

e. MRI emergency power $25,000

Construction Total - $1,455,000

Standard Features

Standby60 Hz ekW (kVA)

Prime60 Hz ekW (kVA)

Standby60 Hz ekW (kVA)

Prime60 Hz ekW (kVA) Emissions Performance

750 (937) 680 (850) 800 (1000) 725 (906) U.S. EPA Emergency Stationary Use Only (Tier 2)

Bore – mm (in) 137.2 (5.4)

Stroke – mm (in) 152.4 (6.0)

Displacement – L (in3) 27.03 (1649.47)

Compression Ratio 16.5:1

Aspiration TA

Fuel System MEUI

Governor Type ADEM™ A4

Cat® Diesel Engine• Meets U.S. EPA Emergency Stationary Use

Only (Tier 2) emission standards• Reliable performance proven in thousands of

applications worldwide

Generator Set Package• Accepts 100% block load in one step and meets

NFPA 110 loading requirements• Conforms to ISO 8528-5 G3 load acceptance

requirements• Reliability verified through torsional vibration,

fuel consumption, oil consumption, transientperformance, and endurance testing

Alternators• Superior motor starting capability minimizes

need for oversizing generator• Designed to match performance and output

characteristics of Cat diesel engines

Cooling System • Cooling systems available to operate in ambient

temperatures up to 50°C (122°F)• Tested to ensure proper generator set cooling

EMCP 4 Control Panels• User-friendly interface and navigation• Scalable system to meet a wide range of

installation requirements• Expansion modules and site specific

programming for specific customer requirements

Warranty• 24 months/1000-hour warranty for standby and

mission critical ratings• 12 months/unlimited hour warranty for prime

and continuous ratings• Extended service protection is available to

provide extended coverage options

Worldwide Product Support• Cat dealers have over 1,800 dealer branch

stores operating in 200 countries• Your local Cat dealer provides extensive

post-sale support, including maintenance andrepair agreements

Financing• Caterpillar offers an array of financial products

to help you succeed through financial serviceexcellence

• Options include loans, finance lease,operating lease, working capital, and revolvingline of credit

• Contact your local Cat dealer for availability inyour region

Cat® C27Diesel Generator Sets

LEHE1213-04 Page 1 of 4

Image shown may not refl ect actual confi guration

Custom Wound Optimum Pitch

C27 Diesel Generator SetsElectric Power

LEHE1213-04 Page 3 of 4

Package PerformancePerformance Standby Prime Standby Prime

Frequency 60 Hz 60 Hz 60 Hz 60 Hz

Gen set power rating with fan 750 ekW 680 ekW 800 ekW 725 ekW

Gen set power rating with fan @ 0.8 power factor 937 kVA 850 kVA 1000 kVA 906 kVA

Emissions EPA ESE (Tier 2) EPA ESE (Tier 2) EPA ESE (Tier 2) EPA ESE (Tier 2)

Performance number DM9071-03 DM9073-02 DM7696-02 DM9069-02

Fuel Consumption100% load with fan – L/hr (gal/hr) 202.9 (53.6) 187.4 (49.5) 216.9 (57.3) 199.6 (52.7)

75% load with fan – L/hr (gal/hr) 162.4 (42.9) 149.6 (39.5) 171.7 (45.4) 157.8 (41.7)



Cooling SystemRadiator air flow restriction (system) – kPa (in. water) 0.12 (0.48) 0.12 (0.48) 0.12 (0.48) 0.12 (0.48)

Radiator air flow – m3/min (cfm) 1200 (42377) 1200 (42377) 1200 (42377) 1200 (42377)

Engine coolant capacity – L (gal) 55.0 (14.5) 55.0 (14.5) 55.0 (14.5) 55.0 (14.5)

Radiator coolant capacity – L (gal) 41.0 (10.0) 41.0 (10.0) 41.0 (10.0) 41.0 (10.0)

Total coolant capacity – L (gal) 96.0 (24.5) 96.0 (24.5) 96.0 (24.5) 96.0 (24.5)

Inlet AirCombustion air inlet flow rate – m3/min (cfm) 58.7 (2073.6) 56.0 (1977.7) 62.8 (2216.4) 60.3 (2129.4)

Exhaust SystemExhaust stack gas temperature – °C (°F) 509.3 (948.7) 502.5 (936.5) 511.4 (952.5) 500.6 (933.0)

Exhaust gas flow rate – m3/min (cfm) 158.9 (5610.2) 149.7 (5285.5) 170.3 (6011.7) 160.7 (5674.4)Exhaust system backpressure (maximum allowable) – kPa (in. water) 6.7 (27.0) 6.7 (27.0) 6.7 (27.0) 6.7 (27.0)

Heat RejectionHeat rejection to jacket water – kW (Btu/min) 324 (18441) 307 (17433) 330 (18785) 320 (18191)

Heat rejection to exhaust (total) – kW (Btu/min) 738 (41994) 693 (39387) 796 (45257) 741 (42135)

Heat rejection to aftercooler – kW (Btu/min) 139 (7898) 123 (6970) 162 (9235) 146 (8320)Heat rejection to atmosphere from engine –kW (Btu/min) 110 (6249) 92 (5238) 110 (6240) 89 (5074)

Heat rejection from alternator – kW (Btu/min) 53 (3014) 47 (2644) 40 (2292) 37 (2081)

Emissions* (Nominal)NOx mg/Nm3 (g/hp-h) 2637.1 (5.25) 2330.9 (4.68) 2580.0 (5.18) 2283.7 (4.61)

CO mg/Nm3 (g/hp-h) 123.9 (0.25) 147.4 (0.29) 115.1 (0.23) 135.6 (0.27)

HC mg/Nm3 (g/hp-h) 11.2 (0.03) 10.9 (0.02) 12.5 (0.03) 12.2 (0.03)

PM mg/Nm3 (g/hp-h) 8.8 (0.02) 8.8 (0.02) 9.7 (0.02) 9.0 (0.02)

*mg/Nm3 levels are corrected to 5% O2. Contact your local Cat dealer for further information.

C27 Diesel Generator SetsElectric Power

Ratings Defi nitionsStandbyOutput available with varying load for the duration of the interruption of the normal source power. Average power output is 70% of the standby power rating. Typical operation is 200 hours per year, with maximum expected usage of 500 hours per year.

PrimeOutput available with varying load for an unlimited time. Average power output is 70% of the prime power rating. Typical peak demand is 100% of prime rated ekW with 10% overload capability for emergency use for a maximum of 1 hour in 12. Overload operation cannot exceed 25 hours per year.

C27 PGBG LEHE1213-04 (10/19)

Weights and Dimensions

Dim “A”mm (in)

Dim “B”mm (in)

Dim “C”mm (in)

Dry Weightkg (lb)

4674 (184.0) 1723 (67.8) 2162 (85.1) 6622 (14,600)

Note: For reference only. Do not use for installation design. Contact your local Cat dealer for precise weights and dimensions.

A B

C

www.cat.com/electricpower ©2019 Caterpillar

All rights reserved.Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.

CAT, CATERPILLAR, LET'S DO THE WORK, their respective logos, “Caterpillar Yellow”, the “Power Edge” and Cat “Modern Hex” trade dress as well as corporate and product

identity used herein, are trademarks of Caterpillar and may not be used without permission.

Applicable Codes and StandardsAS 1359, CSA C22.2 No. 100-04, UL 142, UL 489, UL 869, UL 2200, NFPA 37, NFPA 70, NFPA 99, NFPA 110, IBC, IEC 60034-1, ISO 3046, ISO 8528, NEMA MG1-22, NEMA MG1-33, 2014/35/EU, 2006/42/EC, 2014/30/EU.

Note: Codes may not be available in all model configurations. Please consult your local Cat dealer for availability.

Data Center Applications• ISO 8528-1 Data Center Power (DCP)

compliant per DCP application of Cat dieselgenerator set prime power rating.

• All ratings Tier III/Tier IV compliant per UptimeInstitute requirements.

• All ratings ANSI/TIA-942 compliant for Rated-1through Rated-4 data centers.

Fuel Rates Fuel rates are based on fuel oil of 35º API [16°C (60ºF)] gravity having an LHV of 42,780 kJ/kg (18,390 Btu/lb) when used at 29ºC (85ºF) and weighing 838.9 g/liter (7.001 lbs/U.S. gal.)

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university of kentucky good samaritan hospital generator

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