HomeMy WebLinkAboutMcgrath Waste Heat Status Reports, Trip Reports, & Field Notes 1989Steve Cowper, Governor
Alaska Power Authority
State of Alaska February 22, 1989
Mrs. Linda Hawthorne
City Administrator
City of McGrath
P.0. Box 57
McGrath, Alaska 99627
Dear Mrs. Hawthorne:
Enclosed is a draft Grant Agreement for your review and comment. Please review the Scope of Work (Appendix D) and Schedule and Deliverables (Appen- dix E) carefully to make sure we have enough time budgeted for the various activities. It would also be helpful to confirm whether McGrath Light and Power can do the work on the “not to exceed" funding basis described in the Agreement. Please let us know if there is a problem in that area.
There are many worthwhile energy projects in McGrath, and I am sorry there is not enough funding to do all of them. We are recommending the projects described in the Agreement, because they appear to have the best energy paybacks.
There are several improvements to operating controls in the Snow Building we are not able to fund. These items are mentioned in Sunfair Engineering's energy audit. I am still trying to get information on the extractor for the washeteria from a local vendor. If this looks feasible, we may be able to include it in the final draft of the Agreement.
Based on earlier discussions, I believe we should not include waste heat modifications to the City water system in this Agreement. If there are delays in ironing out a contract with McGrath Light and Power, it will hold up progress on this Agreement. As you know, funds for this project must be expended by June 30, 1989.
We will wait for your copy of the FAA contract, and negotiate separately on a waste heat retrofit, if matters can be worked out with the utility.
Please call me as soon as you have had an opportunity to review the Agree- ment. The final version is still subject to review by the State Attorney General's office, so there may be some changes to the enclosed draft. I look forward to hearing from you soon.
Sincexely,
Pili
Project Manager
Enclosure as stated
CO PO. Box AM Juneau, Alaska 99814 (907) 465-3575
® PO. Box 190869 704 East Tudor Road Anchorage, Alaska 99519-0869 (907) 561-7877
5099/946(1)
TRIP REPORT
MCGRATH
NOVEMBER 7-8, 1988.
Technical details:
Snow building:
This building is experiencing a rather high power consumption due to the installation of a variety of pumps, fans etc. These include:
Supply fan: 3 hp
Return fan: 3 hp
Recirculation fan: 2 hp
Water system heating circulating pump: 3 hp Water system circulating pumps (2 ea.) 0.75 hp Washeteria heating system pump: 0.75 hp Washeteria hot water pumps (2 ea) 0.25 hp Tank heating circulating pump: 0.75 hp. Pressure pumps (4 ea) (non-continous)3-40 hp.
All except the pressure pumps were operating continously except when manually shut down during the summer etc.
Additionally, heat tape of the water river line (unknown consumption) and general lighting contributes to the overall consumption.
The water circulating pumps have been designed to provide 40 gpm at 30 ft of head; however, they appear to provide only 25 gpm at 31 feet of head.
It appears that with rather minor piping modifications the circulating water system can be modified to accept waste heat. This will make it possible to shut down a 3 hp and a 0.75 hp pump during maybe 90% of the year and the added pumping power required to operate the waste heat system will amount of about 0.5 hp.
Similar pumping work will be required in the power plant, if the existing heat exchanger, previously used to heat a green house, is put back in service.
The power and fuel consumption for general heating purposes in the Snow building can be drastically reduced through air re- circulation and fan speed reduction or shutdown during no-use
hours. An energy audit previously performed on this building addresses this issue in detail.
It is possible, that a replacement of existing hot water coil- heated dryers with direct fired dryers can drastically reduce the air flow needed to dry a load of clothes. As the dryers use room air, which is subsequently discharged to the outside, this will reduce the infiltration losses and thereby the heating load on the heating system.