D.Q&As-consolidated.pdf

Consolidated Questions and Answers to Sources Sought Notice for District Heat Service to the Rhine Ordnance Barracks Medical Center Replacement (ROB MCR), posted on Sep 18, 2018, amended on Sep 19, 2018.

Q: What about the refrigeration and electricity generation, since we only speak of heat in the documents? Should this all flow into concept later?

A: The Sources Sought is only seeking providers of District Heating for the Medical Center. Refrigeration and electrical generation have already been coordinated.

Q: Has the USAG already designated a site outside the barracks, or does the contractor really need to take care of it himself, including the new technical building?

A: The location of the Heating Plant is to be determined by the Contractor based on coordination with the appropriate parties.

The Heating Plant cannot be located on the Medical Center site due to environmental permitting restrictions.

Q: Is there also the possibility of the attached AIRBASE to draw a line to the hospital?

A: Heat line connections to the Medical Center from adjacent areas is a possibility assuming the appropriate coordination has been made with the properties being crossed.

Q: How is the issue of emergency power and redundancies handled, or should this be incorporated into the concept later?

A: Emergency power redundancy has already been coordinated and is not a part of this scope. The redundancy of the Heating Plant and the district heat lines should be incorporated into the concept.

Q: Is EEWärme G and / or EneV 2016 to be adhered to by the USAG?

A: Adherence with EEWarmeG and/or EneV 2016 is a requirement. It is also assumed that the district heat will provide a primary energy factor of 0.7. Confirmation that this can be met is required.

Required Capabilities Q: 1. Request the U.S. Government provide additional information regarding the co‐generation unit to be operated and maintained by the contractor:

a. Where will the co‐gen unit be installed?

b. Please provide the unit manufacturer

c. What is the anticipated usage of the unit (i.e. will it serve as redundancy for heat production, emergency electricity generation, or other)?

d. What is the heat output of the unit?

e. What is the electrical output of the unit?

f. What is the fuel source of the unit?

g. Who will be responsible for fuel purchase?

h. Do firm maintenance schedules exist? If yes, what do they include? If no, is it the responsibility of the contractor to develop those and perform the maintenances to include the major revisions after an extended period of operation?

i. Do specific guidelines/demands of the user exist with regard to the operation of the unit (i.e. should it be operated with focus on electrical of heating output)?

A: 1) The first sentence in the Required Capabilities Section has been revised as follows:

"The Contractor shall provide district heat (including operation and maintenance) up to the exchange point for the new Army Hospital currently under construction at 67685 Weilerbach, Germany."

This makes all the #1 Questions under Required Capabilities from the bidder not applicable. However answers are partially provided in the attached schematic.

Estimated demand values Q: Which return temperature is required?

A: The Temperature for Supply = 95 degree C; Temperature for Return = 55 degree C.

Q: What is the minimum heat capacity required during summer months?

A: The low summer capacity for the ROBMCR is estimated to be 200 kW. The minimum heat capacity required during summer months for the District Heat Supplier will be 0 kW. This is due to the COGEN unit [not a part of this request] supplying heat at an average of 845 kW (up to 1000 KW) for the base energy demand.

Q: What type of heat transfer is anticipated? Direct system or indirect system via heat exchanger? Please provide the required pressure and differential pressure requested.

A: The heat transfer system will be indirect via a heat exchanger. The estimated pressure drop across the heat exchangers is expected to be from 50‐75 kPa. This assumes a typical plate exchanger. It is at the discretion of the proposer to size their primary side pump, but the difference in the range is minimal, on average 20‐100 kPa.

Q: The Government will evaluate market information…..:

1) Please define “and otherwise anticipated”.

A: “and otherwise antipicated” has been deleted.

Additional Information and submission details (capabilities statement):

Q: a) and d) 4) delivery lines and routing: What is the minimum distance required between two line routings or do two completely different routings have to be utilized?

Are two separate entries into the exchange point (EP) required?

A: The minimum distance between the two line routes should be at least 5 meters. This will help to prevent the potential that both sets of lines can be damaged by the same event, such a being cut by an excavator. A single entry into the Exchange Point is acceptable.

Q: f) 6.) Please provide a reference to determine “…requirements in the Facility and Safeguarding requirements”.

A: f) 6.) has been deleted.

Line routing, installation of district heat lines, redundancy:

Q: Is it allowed to install the lines in one singular trench in the airport access area, or must each line be installed by itself?

A: The minimum distance between the two line routes should be at least 5 meters. This will help to reduce the potential that both sets of lines can be damaged by the same event, such a being cut by an excavator.

Energy Balance:

Q: Is heat recovery envisioned for the HVAC system, and to which size?

A: All Air Handling units have KVS heat recovery (WRG). The requested capacity and peak load (kW) has accounted for the heat recovery and should not be a concern to the district heat supplier.

Q: According to our knowledge, it is planned to include a co‐gen plant, which will be constructed as part of the project. What is the size of the capacity of this co‐gen plant and which heat contribution will it deliver (in kWh)?

A: The Cogen is expected to provide an average of 845 kW (up to 1000 kW) of heat and run approximately 6000‐6400 hours per year. The requested demand/capacity and peak load (kW) has purposefully not included the heat production of the Cogen. The intent is that the district heat supply will satisfy the heating demands of the ROBMCR without the Cogen (Same goes for the electrical demand). Please see the attached diagram for an explanation of the relationship between the COGEN Unit and the District Heat input.

Energy Center:

Q: Is a mobile heating center (MHZ) allowed in this location? It could serve for redundancy, while the required connections would be included accordingly. This MHZ could be installed and used when needed. It includes a mobile storage tank, which meets the WHG requirements (German Water Act).

A: This is possibly a viable alternative and should be a part of the proposal if capable of providing the required capacity. However, a MHZ is un‐favored when compared to the redundant line being requested because of the provisional space need on site to place the equipment, the delay of heating during set up, access to the ROB site for personnel to operate the MHZ, etc. It would be recommended at a minimum to include information on the redundancy as requested and if desired, show the MHZ as a betterment to the proposal request.