95-Design_Submittal_COOLING.pdf

US AIR FORCE REPLACE HVAC-SY

SPACE COMMAND 95

STEM AT BMEWS

% Design Submittal

THULE AIR BASE, GREENLAND

PROJECT WWCX NO. 01-1013

REPLACE HVAC-SYSTEM AT BMEWS, PHASING

ATTACHMENT PHASE A COOLING

SUMMARY OF PROJECT REQUIREMENTS AND FINDINGS & RECOMMENDATIONS.

AUGUST 15, 2014

ISC Rådgivende Ingeniører ISC Consulting Engineers

WWCX NO. 01-1013, REPLACE HVAC-SYSTEM AT BMEWS, THULE AIR BASE, GREENLAND

95% Design Submittal

2/17

C:\Users\Jesper\Desktop\FA2523-14-R-0002 - HVAC at BMEWS PH A\Report\95-Design Submittal_COOLING.doc

Table of Contents

1.00 Cooling Water System

2.00 Chilled Water System

3.00 Heat Dissipation System

4.00 Recommendation for Cooling Water System

4.01 Recommendation for existing Chilled Water System

4.02 Recommendation for existing Heat Dissipation System

5.00 Energy calculations

5.01 Unit Price

5.02 Operation hours

5.03 Annual Energy Savings

6.00 Electrical Installations

Attachment No.:

A-001. Cost Estimate A-002. Energy Savings A-003. Minutes of Meeting A-004. Proposal for new Water Chillers A-005. Mail from Raytheon A-006. Proposal for new Radiator Coolers

3/17

1.00 Cooling Water System

This document presents the 95% DESIGN SUBMITTAL for the project “WWCX 01- 1013, Replace HVAC-system at BMEWS, Phasing". Additions to FINDINGS AND RECOMMENDATIONS REPORT are shown in bold.

General

The Cooling Water System at BMEWS consists of a system for Cooled Glycol Water System and a Chilled Water System.

The Cooled Glycol Water System is a closed piping circuit provided with cooled ethylene-glycol water solution (65%) from 4 Air-Cooled Heat Exchangers located in the Heat Dissipation Shed.

The Cooled Glycol System is providing the Thule Array Radar with cooling 24/7 and the Chiller Condenser during summertime or the Heat Exchanger (chilled water) during the wintertime.

The Chilled Water System is a closed piping circuit provided with Chilled Water from 2 Rotary Liquid Chillers during the summertime.

During wintertime the Chilled Water is provided from the Heat Exchanger (Chilled Water) cooled with cooled ethylene-glycol water solution from the Heat Dissipation System.

The Chilled Water System is providing the Cooling Coils in the different Air Handling Units, Fan Coils and Chilled Water Terminal Cooling Units for individual areas with chilled water.

2.00 Chilled Water System

Existing Chillers

The existing Chillers consist of 2 chillers of manufacturer TRANE model RTHA 130, from year 1991. The chillers are operating on R22 refrigerant.

According to the chiller schedule on drawing M-2 sheet 2 of 3, the Chiller Evaporator has a capacity of approx. 335 kW with chilled water at a temperature at 42.0˚F (5.6 ˚C) / 50.8˚F (10.4 ˚C).

The Chiller Condenser are cooled with chilled ethylene-glycol water solution from the Heat Dissipation System at 75˚F (23.9˚C) / 84.1˚F (28.9˚C), and according to the chiller schedule on drawing M-2 sheet 2 of 3, the condenser are cooled with a capacity of approx. 450 kW.

4/17

The Chiller can be regulated variable from 20-100% capacity load.

The chiller system is provided with redundancy, since only one of the chillers is in operation while the other is standby.

Existing Heat Exchanger

The Heat Exchanger of manufacturer TRANTER model SUPERCHARGER is from year 1991.

The Heat Exchanger is provided with chilled ethylene-glycol water solution from the Heat Dissipation System during the wintertime at 43˚F (6.1˚C) / 51.7˚F (10.9˚C).

According to the Heat Exchange schedule on drawing M-2 sheet 2 of 3, the heat exchanger has a capacity of approx. 380 kW with chilled water at a temperature at 45.0˚F (7.2 ˚C).

At the site visit we did not see any sign of corrosion on the heat exchanger and we were not told about any problems concerning etc. lack of capacity or other kind of problems.

Existing Control System

The Chilled Water System is controlled by a control system of make TRANE

TRACER 100.

The existing chiller control system from year 1991 has exceeded its life expectancy and is in poor condition.

Cooling load

According to ISC site visit investigation April 2014 (refer to Attachment A-003, Minutes of Meeting MOM 2), the present maximum cooling load for the chilled water system has been calculated to a capacity of approx. 150 kW.

The calculation is based on the present cooling load by Cooling Coil C5 (Electrical Power Center), Cooling Coil C8 (Kitchen) and the fan coils located inside MILSATCOM. All other cooling coils installed at the Chilled Water System has been demolished, disconnected or put out of operation.

5/17

Corrosion

At the site visit we did not see any sign of corrosion on the chilled water piping and we were not told about any problems concerning etc. lack of capacity or other kind of problems.

Variable Speed Drives

The pumps for the chilled water system are not provided with any variable speed drives.

3.00 Heat Dissipation System

Existing Heat Dissipation System

The Heat Dissipation System consist of a closed piping circuit for a ethylene-glycol water solution (65%) which removes heat load from the Thule Array Radar and the Chiller Condenser during summertime or the Heat Exchanger during wintertime.

The heat load dissipates to the outside air through 4 Air-Cooled Heat Exchangers located in the Heat Dissipation Shed.

The existing 4 Air-Cooled Heat Exchangers, located in the Heat-Dissipation Shed, consist each of a Propeller Fan and a Coil Section. The Propeller Fan is driven by a two-speed, reversible motor through a gear reducer.

The fan draws fresh air through the Fresh Air Intake Dampers and forces it through the Coils, which are filled with warm ethylene-glycol water solution. Then part of the air circulates through the Recirculation Dampers and the remainder passes to the outside through the Exhaust Air Dampers.

The reversing feature of the fans is provided to de-ice and clear the filters and intake dampers of any snow accumulation.

Existing Air-Cooled Heat Exchangers

The 4 Air-Cooled Heat Exchangers of manufacturer YOUNG RADIATOR COMPANY model HC-2420, was installed at BMEWS about 1960.

The propeller fan for each Heat Exchanger has a capacity of approx. 225.000 SCFM (382.300 m3/h) at full fan speed and approx. 112.000 SCFM (190.300 m3/h) at half fan speed.

6/17

The Heat Dissipation System can be regulated variable from 20-100% capacity load.

The 4 Air-Cooled Heat Exchangers maintain a maximum ethylene-glycol water solution supply temperature of 58.0˚F (14.4˚C) during summertime and a supply temperature of 49.0˚F (9.4˚C) during wintertime.

The period of summer is defined when outside temperature is about ≥ 35.0˚F (1.7˚C).

According to the (original) performance curve in the old documentation, the capacity of each Air-Cooled Heat Exchangers at an ambient temperature at 59.0˚F (15.0˚C), are listed to be approx. 5.700.000 Btu/hour (1670 kW) at full fan speed and approx. 3.150.000 Btu/hour (920 kW) at half fan speed.

The performance curve in the documentation does not tell anything of the associated temperatures (inlet and outlet temperature) for the above mentioned cooling capacity of the ethylene-glycol water solution.

It is assumed that the above mentioned cooling capacity is based on an outlet temperature of the ethylene-glycol water solution from the Heat Exchanger equal to the set-point at 70.0˚F (21.1˚C) which was used for cooling the old Radar System at Thule.

Calculation based on the listed flow 790 GPM (179,646 l/h) through the Air-Cooled Heat Exchangers and the listed cooling capacity, shows that the temperature difference between the inlet and outlet temperature for the ethylene-glycol water solution must be approx. 19.1˚F (10.6˚C).

With reference to the information from Raytheon (see Attachment No. A-004) the original design set-point at 70.0˚F (21.1˚C) for supply temperature of the ethylene-glycol water solution for the new Array Radar was changed to the lower set-point at 58.0˚F (14.4˚C) when the new Array Radar was taken in operation.

We were informed, that the Heat Dissipation Radiators are missing capacity during short periods (hours) with high ambient air temperature, since there have been few occasions were a (pre-warning) technical temperature alarm with a set-point at about 66.0˚F (18.9˚C) from the heat exchangers has been exceeded.

The occurrence with the (pre-warning) technical temperature alarm caused by the high ambient temperature has occurred almost every summer since the new Array Radar was installed in 1987.

We were informed that in general most of the (pre-warning) technical temperature alarms were caused by malfunction of the Control System for the Actuators for the Dampers at the air intake or exhaust air in the Heat-Dissipation Shed.

7/17

The original design set-point for the high temperature alarm at 76.0˚F (24.4˚C) was never changed.

There has never been any high temperature alarm.

The original design set-point for the low temperature alarm at 60.0˚F (15.6˚C) was at the same time (in 1987) changed to 35.0˚F (1.7˚C).

There has never been any low temperature alarm.

We were informed that the existing Propeller Fan with the reducer gear and Intake and Exhaust Dampers with Actuators have exceeded its life expectancy and is in poor condition.

Cooling load

Design data on Raytheon drawing number AW35-46-10, shows that the design flow for cooling the new Array Radar is listed to be 193 GPM for each Array Face.

According to information received, the supply temperature is approx. 60.0˚F (15.6˚C) and the return temperature is approx. 70.0˚F (21.1˚C).

Calculations based on the above listed flow, 2 x 193 GPM (87,776 l/h), through the cooling loops on the Array Radar and the above mentioned temperatures for supply and return (60.0˚F (15.6˚C) / 70.0˚F (21.1˚C)) of the ethylene-glycol water solution shows that the necessary cooling load from the new Array Radar is approx. 425 kW.

The Chiller Condenser are cooled with chilled ethylene-glycol water solution from the Heat Dissipation System at 75˚F (23.9˚C) / 84.1˚F (28.9˚C), and according to the chiller schedule on drawing M-2 sheet 2 of 3, the condenser are cooled with a capacity of approx. 450 kW.

According to the maximum cooling capacity at approx. 150 kW (or about 45%) needed for the chiller system for the building cooling load, the maximum cooling capacity for the ethylene-glycol water solution will be of approx. 200 kW.

There are some other consumers of the ethylene-glycol water solution on the Raytheon drawing number AW35-46-10. It has not been able to collect data for the missing cooling load but it is assumed that it is a small cooling load compared to the cooling load from the Array Radar.

In the following it is assumed that the additional Cooling Load for ex the new C- MOCK is equal to approx. 150 kW.

8/17

Based on the above the total Cooling Load for the Heat Dissipation System during summertime will be 425 kW (Array Radar), 200 kW (Chiller Condenser) and 150 kW (additional Cooling Load) equal to a total of approx. 775 kW.

The demand for cooling load to the Heat Dissipation System of approx. 775 kW can be compared with the listed cooling capacity according to the performance curve for each air-cooled Heat Exchangers at an ambient temperature at 59.0˚F (15.0˚C) at approx. 5,700,000 Btu/hour (1,670 kW) at full fan speed and approx.

3,150,000 Btu/hour (920 kW) at half fan speed.

Since the Heat Dissipation System consist of 4 identical Air-Cooled Heat Exchangers, there is a total cooling capacity at approx. 22,800,000 Btu/hour (6,680 kW) at full fan speed and approx. 12,600,000 Btu/hour (3,680 kW) at half fan speed.

The Heat-Dissipation System is provided with a large cooling capacity at the most usual temperatures which appears at Thule but there has been some occasions (hours) where a (pre-warning) technical temperature alarm with a set-point at about 66.0˚F (18.9˚C) from the heat exchangers has been exceeded during the summertime with relative high ambient air temperature.

The original design set-point for the high temperature alarm at 76.0˚F (24.4˚C) has never been exceeded.

Existing Control System

The Heat Dissipation System is controlled by a Control System of make TRANE

TRACER 100.

The existing Control System from year 1991 has exceeded its life expectancy and is in poor condition.

Existing Warm Air Recirculation System

The existing warm air recirculation systems with wall (and floor) mounted pneumatically operated louvers from year 1960, has exceeded its life expectancy and is in poor condition.

We were informed that in general most of the (pre-warning) technical temperature

9/17

Steam Powered Warm-Up Heat Exchangers

The Heat Dissipation System are provided with 2 Steam Powered Warm-Up Heat Exchangers each with a capacity to warm-up 4,000 Gph glycol solution from -40˚F (-40.0˚C) to 40˚F (4.4˚C).

Corrosion

At the site visit we did not see any sign of corrosion on the ethylene-glycol water solution piping and we were informed that there has been no sign of corrosion on this pipe system.

We were informed that there has not been any sign of corrosion on the Heat Dissipation Radiators in this building.

It was reported that there had been several corrosion problems with similarly Heat Dissipation Radiators in another building at BMEWS but this plant was now taken out of operation and was not used any more.

Variable Speed Drives

The pumps for the ethylene-glycol water solution system are not provided with any variable speed drives.

4.00 Recommendation for Cooling Water System

4.01 Recommendation for Chilled Water System

With reference to the Delivery Order Package (DOP) we recommend the existing Chillers operating on R22 refrigerant to be replaced with 2 new Chillers operating on R134A or adequate refrigerant.

The reduced cooling load at about 150 kW is not available as a Rotary Liquid Compressor from TRANE. For the actual cooling load TRANE recommend to use a Water Chiller provided with a number of Scroll Compressors.

According to TRANE refrigerant R134A for Chillers with design temperature as TAB is today replaced with refrigerant R410A.

10/17

Proposal for the 2 units of Water Chillers:

New Water Chillers as product TRANE, type CGWQ-40 Water Cooled Chiller Unit, each with a capacity of 43.2 tons/hr, 518,202 Btu/hr (152 kW).

The unit includes 4 Scroll Compressors, 2 Circuit Machine with 2 Shell & Tube Condensers and 2 Circuit Brazed Plate Evaporator.

The Chiller can be regulated in steps in following capacity load 25 - 50 - 75 - 100%

The dual independent refrigerant circuits eliminate 100% capacity loss in the event of a component failure such as a Compressor.

The proposed Water Chillers are operating on R410A refrigerant.

For further information, refer to Attachment No. A-004.

Proposal for the Chilled Water Pipe System:

In order to prevent short-cycling of the chillers to promote long chiller life and good chilled water temperature control, the manufacturer recommend a minimum volume of the chilled water system.

The minimum volume of the chilled water system can be provided by design of the pipe system with constant volume flow and 3-way control valves at the cooling coils or by the design of an inertia tank or buffer tank in the chilled water loop to achieve the required minimum system volume.

The chilled water storage tank shall be installed downstream of the chiller and upstream of the cooling coils. The chilled water storage tank shall have a volume of typically approx. 530-800 Gallons (2-3 m3).

The design with a chilled water storage tank or buffer tank will provide chiller-pumps (with constant volume flow) in the chilled water loop between the chillers and the tank and additional supply-pumps (provided with variable speed drives for variable volume flow) in the chilled water loop between the tank and 2-way control valves at the cooling coils.

During site visit we have examined the existing pipe system and the existing chilled water system is provided with constant volume flow and 3-way control valves at the cooling coils.

Regarding the supply-pumps for the chilled water system to be provided with variable speed drives we do not recommend the pumps to be provided with variable speed drives for variable volume flow, since it would demand a major

11/17 rebuilt of the chilled water pipe system including a buffer tank with chiller-pumps and 2-way control valves at the cooling coils.

Based on the above mentioned we therefore recommend to continue the operation of the existing Chilled Water Pipe System as it have been doing previous with constant volume flow and 3-way control valves at the cooling coils since the existing system have prevented short-cycling of the chillers and promoted long chiller life and good chilled water temperature control.

Proposal for the Chilled Water Pumps:

Based on the fact that the demand for cooling capacity has been reduced from previous 335 kW to now about 150 kW, we also recommend the supply-pumps for the chilled water system to be replaced by new pumps with equivalent capacity.

We will not recommend replacing the existing supply pumps for the Cooling Coils located in MILSATCOM since the cooling capacity has not been changed.

We will not recommend replacing the existing supply pumps for the Cooling Coils located in old C-MOCK since the future cooling capacity for this area is unknown.

We recommend the replaced pumps to be the same product Grundfos as the present pumps.

We recommend the new pumps to be provided with integrated VFD in order to optimize adjusting and balancing the correct constant water flow for the Chilled Water System.

The integrated VFDs for the proposed Chilled Water Pumps will minimize the electrical energy consumption, refer to attachment A-002 Energy Savings.

Proposal for the Chilled Water Heat Exchanger:

We will not recommend replacing the existing Heat Exchanger for Chilled Water since we did not see any sign of corrosion on the chilled water piping and we were not informed about any problems concerning etc. lack of capacity or other kind of problems.

Proposal for the new Chiller Control System:

We recommend providing the new Water Chillers with a new Chiller Control System since the existing Chiller Control System as product TRANE TRACER 100 from year 1991 has exceeded its life expectancy and are in poor condition.

12/17

New Chiller Control System as product TRANE TRACER SUMMIT.

The new Chiller Control System shall prevent short-cycling of the Chillers to promote long chiller life, as recommended by the manufacturer.

General:

For Cooling Systems it is very important for the total energy savings to provide the necessary cooling for the plant at the highest possible (or most warm) chilled water supply temperature.

This in order to maximize the production of the chilled water at the lowest energy cost by the Heat Dissipation System and at the same time to minimize operation hours of production by the new Water Chillers.

We also recommend the new Chiller Control System to control the chilled water produced by the heat dissipation system as long as the ambient air temperature are sufficient low to maintain the supply temperature of the chilled water.

Based on the above mentioned, we recommend that the design data for Chilled Water supply temperature is revised to highest possible level for all future new Terminal Cooling Units and all new Cooling Coils for Air Handlings Units.

Increasing of the chilled water supply temperature may in some occasions result in missing cooling capacity for individual areas and this can be solved by installing some additional Fan Coils or Chilled Water Terminal Cooling Units.

4.02 Recommendation for Heat Dissipation System

General

For an Air-Cooled Dry Radiator or Heat Exchanger like the Heat Dissipation Systems installed at TAB it is not physically possible to produce cooling water at a lower temperature than some (few) degrees above the dry bulb temperature of the ambient air.

Based on the above mentioned physically law, it will not be possible to avoid the (pre-warning) technical temperature alarm since the ambient air temperature off the cooling air during warm periods is very close to the present set-point for supply temperature of the ethylene-glycol water solution and the set-point for the (pre-warning) technical temperature alarm.

13/17

Missing Capacity

We were informed, that the heat dissipation radiators are missing capacity during short periods (hours) with high ambient air temperature, since there have been some few occasions were a (pre-warning) technical temperature alarm with a set-point at about 66.0˚F (18.9˚C) from the heat exchangers has been exceeded during summertime.

The occurrence with the (pre-warning) technical temperature alarm caused by the high ambient temperature has occurred almost every summer since the new Array Radar was installed in 1987 and the set-point for supply temperature of the ethylene-glycol water solution was changed from 70.0˚F (21.1˚C) to 58.0˚F (14.4˚C).

We were informed that in general most off the (pre-warning) technical temperature alarm were also caused by malfunction of the Control System controlling the actuators for the dampers for the air intake or exhaust air in the heat-dissipation shed.

The original design set-point for the high temperature alarm at 76.0˚F (24.4˚C) was never changed.

There has never been any high temperature alarm.

The original design set-point for the low temperature alarm at 60.0˚F (15.6˚C) was at the same time changed to 45.0˚F (7.2˚C).

There has never been any low temperature alarm.

New Heat Dissipation Radiators

With reference to the Delivery Order Package (DOP) the existing glycol/water Heat Dissipation Radiators with Fans, Gear Boxes, and drivers have exceeded their life expectancy and are in poor condition.

The above mentioned are in agreement with the understanding we received from our site-visit and therefore we recommend the existing glycol/water Heat Dissipation Radiators with Fans, Gear Boxes, and drivers to be replaced with 4 new Heat Dissipation Radiators.

We have contacted Young Radiator Company who built the present Heat Dissipation Radiators but the company does not produce radiators of that kind anymore.

14/17

As a consequence of the above we have contacted a producer of Radiator Coolers, Cooling Products, Inc. who has a long customer listing for Radiator Coolers delivered for arctic locations.

Cooling Products, Inc. can provide custom manufactured Radiator Coolers based on the old Young design data in order to replace the existing Radiator Coolers with new and more efficiency Radiator Coolers.

Proposal for 4 new Heat Dissipation Radiators

We will therefore propose the replaced Radiator Coolers as product Cooling Products, type 1M24-24141 / 171B6-24-04, refer to Attachment No. A-006.

The new Radiator Coolers from Cooling Products, Inc. will need less power demand than the existing, since the new radiators will only need about 30 Hp each compared to the existing who needs about 40 Hp.

Cooling Products, Inc. has also recommended the propeller fans to be provided with variable speed drives, and operation with variable speed drives will decrease the reduced need for power even more.

Proposal for a new Heat Dissipation Control System

We also recommend too provide the Heat Dissipation System with a new Control System since the existing Heat Dissipation Control System as product TRANE TRACER 100 from year 1991 has exceeded its life expectancy and are in poor condition.

We will propose the new Heat Dissipation Control System as product TRANE

TRACER SUMMIT.

Proposal for new Warm Air Recirculation System

The existing warm air recirculation systems with wall (and floor) mounted pneumatically operated louvers from year 1960, has exceeded its life expectancy and is in poor condition.

We were informed that in general most of the (pre-warning) technical temperature

15/17

Based on the above we recommend the existing warm air recirculation system with wall (and floor) mounted pneumatically operated louvers, to be replaced by a new pneumatically operated system as product Cooling Products.

Proposal for Steam Powered Warm-Up Heat Exchangers

Since the Steam System at BMEWS is going to be replaced by a Hot Water System the 2 existing Steam Powered Heat Exchangers shall be replaced as well.

The existing 2 Steam Powered Warm-Up Heat Exchangers each with a capacity to warm-up 4000 GPH glycol solution from -40˚F (-40.0˚C) to 40˚F (4.4˚C) shall be replaced by two new Hot Water Powered Heat Exchangers with equal capacity as the present.

Proposal for the Glycol Water Pumps

We have examined the existing Pipe System for the ethylene-glycol water system and the Pipe System is designed for constant volume flow.

Based on that fact we do not recommend the existing Glycol Water Pumps to be provided with variable speed drives.

We will not recommend replacing the existing Glycol Water Pumps since the cooling capacity has not been changed.

5.00 Energy calculations

5.01 Unit Price

In general the calculations for energy cost savings are based on an informed unit price at 0.43 $ / kWh (0.126 $ / kBtu) electric power.

5.02 Operation hours

The calculations of electric consumption for the cooling equipment are based on installed capacity for the present and the replaced equipment and the following assumptions for operation hours etc.:

16/17

Water Chillers (CH-1, CH-2):

One Water Chiller in operation and one stand by. The Water Chillers are in operation during summer time. The period of summer is defined when outside temperature To is about ≥ 35.0˚F (1.7˚C) equals to about 2,000 hours/year.

Chilled Water Pumps (CHWP-1, CHWP-2, CHWP-3):

One pump in operation and two stand by. Chilled Water Pumps in operation 24/7 equals to 8,760 hours/year.

Building Chilled Water Pumps (BCHWP-1, BCHWP-2, BCHWP-3):

One pump in operation and two stand by. Building Chilled Water Pumps in operation during the summer time. The period of summer is defined when outside temperature To is about ≥ 35.0˚F (1.7˚C) equals to about 2,000 hours/year.

Glycol Water Pumps (GWP-1, GWP-2, GWP-3):

One pump in operation and two stand by. Glycol Water Pumps in operation 24/7 equals to 8,760 hours/year.

Radiator Coolers (HD-A, HD-B, HD-C, HD-D):

Two radiator coolers in operation (50%) and two stand by when outside temperature To is < - 0.5˚F (-18.0˚C) equals to about 2,000 hours/year.

Three radiator coolers in operation (50%) and one stand by when outside temperature To is:

-0.5˚F (-18.0˚C) < To < -21.0˚F (-6.0˚C) equals to about 3,000 hours/year.

Four radiator coolers in operation (50%) when outside temperature To is:

-21.0˚F (-6.0˚C) < To < 48.0˚F (9.0˚C) equals to about 3,500 hours/year.

Four radiator coolers in operation (100%) when outside temperature To is > 48.0˚F (9.0˚C) equals to about 260 hours/year.

5.03 Annual Energy Savings

Based on the above the annual energy savings for electrical energy consumption will be about 232,000 kWh (793 MBtu) or about $ 100,000 based at a unit price at

0.43 $ / kWh (0.126 $ / kBtu).

Further information about the calculations refers to schedule attachment A-002:

17/17

6.00 Electrical Installations

a. Electrical work description

The electrical supply will consist of the complete electrical installations for the new cooling equipment. The Work consists of supplying and installation of all necessary wires, cables, raceways and equipment.

The electrical work consists of:

-Dismantling and disposal of existing electrical equipment.

-Installation of all new necessary equipment, wires and cables

b. Cooling Equipment

The existing circuit breakers in existing panels for the new compressor 1 and 2 will be replaced. New wires will be pulled in existing conduits from the panel to the new compressor. 3 current-carrying wires and 1 ground wire will be installed.

The existing 9 cooling pumps will be replaced with new pumps and the existing electrical installation shall be adapted to new pumps.

The 9 cooling pumps are 3 Building Chilled Water Pumps (BCHWP-1, BCHWP-2, BCHWP-3), 3 Chilled Water Pumps (CHWP-1, CHWP-2, CHWP-3) and 3 Glycol Water Pumps (GWP-1, GWP-2, GWP-3).

Two new panels for radiator coolers total 4 circuit breakers three phase, and 2 spare breakers will be installed according to drawings.

c. Control system.

The existing control system for the cooling equipment will be upgraded. The new control system for the cooling equipment will be THRANE TRACER SUMMIT or equal product.

For each radiator cooler there will be a push button for activate a reversible motor drive with a predetermine speed.

A gateway from BMS to the control system for the cooling plant will be performed.

d. Bonding and grounding All electrical and mechanical steel equipment in this project shall be bonded and grounded to the existing grounding system. Ground wires will be included in all circuits.

ATTACHMENTS

ATTACHMENT

NO. A-001

NO. A-002

NO. A-003

NO. A-004

NO. A-005

NO. A-006

AUGUST 15, 2014

6.00 Electrical Installations