The Accelerated Chiller Retirement Initiative introduced earlier this year was a new incentive structure designed to encourage the accelerated replacement of aged water cooled chillers. The purpose was to significantly affect the summer peak electrical demand for 2007 and beyond. As a result of current market conditions, UI and the Energy Conservation Management Board have reviewed the Accelerated Chiller Retirement Initiative, and are implementing several changes which are identified below. All Energy Opportunities rules apply with the following modifications.
- Effective September 30, 2007, no new Accelerated Chiller Retirement projects will be accepted by the Companies for evaluation.
- To ensure projects are completed to achieve the objective of reducing the summer peak in 2008, All submitted projects must be installed by April 30, 2008.
Accelerated Chiller Retirement Incentive Structure:
- Incentive will be the lesser of:
- 75% of the project cost,
- 100% of the Utility Measure cap
- $600 / ton See note 1.
Accelerated Chiller Retirement Guidelines:
· Only water-cooled chillers that are a minimum of 25 years old.
· The existing chiller may be either a comfort cooling or process cooling unit.
· The existing chiller must be operational and operate during the peak summer months to be eligible. (Peak summer time is determined as June thru August from 1:00 PM to 5:00 PM weekdays)
· Proposed new High Efficiency Chiller must have an efficiency rating (IPLV) of at least 3% better than the minimum efficiency allowed by Connecticut building Code. (IPLV must be stated @ ARI 550/590-98 conditions)
· Engineer/chiller manufacturer will be required to provide a chiller energy analysis that indicates pre and post chiller plant performance data. The analysis shall indicate the kW demand reduction and annual kWh energy savings for multiple simulations. All calculations shall be provided to the utility to allow a third party review of the calculations. The utility will allow 10% efficiency degradation from the new ratings on the existing chiller’s NPLV performance ratings due to age. The analysis shall be submitted in the following format:
1. The first energy analysis shall determine the existing chiller plant performance based on the present chiller arrangement and operating conditions.
2. The second energy analysis shall determine the savings that the customer should realize if the existing chiller was replaced with a new chiller that matches the performance requirements of the latest CT Building Code. (Refer to minimum standards below)
Baseline Water-Cooled Centrifugal Chiller Ratings:
(IPLV must be stated @ ARI 550/590-98 conditions)
% Capacity <150 Tons >=150,<300Tons >=300Tons
100% 0.70 kW/ton 0.63 kW/ton 0.58 kW/ton
75% 0.64 kW/ton 0.57 kW/ton 0.52 kW/ton
50% 0.67 kW/ton 0.60 kW/ton 0.55 kW/ton
25% 0.81 kW/ton 0.72 kW/ton 0.67 kW/ton
IPLV 0.67kW/ton 0.60 kW/ton 0.55 kW/ton
Baseline Water-Cooled Screw Chiller Ratings:
(IPLV must be stated @ ARI 550/590-98 conditions)
% Capacity <150 Tons >=150,<300Tons >=300Tons
100% 0.79 kW/ton 0.72 kW/ton 0.64 kW/ton
75% 0.64 kW/ton 0.60 kW/ton 0.55 kW/ton
50% 0.68 kW/ton 0.63 kW/ton 0.57 kW/ton
25% 0.82 kW/ton 0.76 kW/ton 0.69 kW/ton
IPLV 0.68kW/ton 0.63 kW/ton 0.57 kW/ton
Note: Provided the existing chiller plant operating conditions (water flows and temperatures) are within 10% of ARI 550/590-98 the above ratings can be used. If the conditions are outside the ARI conditions by more than 10%, then use the NPLV ratings of the baseline chiller for this analysis.
3. The third energy analysis shall determine the savings the customer should realize if the existing chiller was replaced with a new High Efficiency chiller.
· Engineer/chiller manufacturer will be required to provide a written description of the chiller plant sequence of operation. The write-up to include all pre and post conditions use in the energy analysis, chiller sequencing, water temperatures, flow rates and run hours for example.
· The Utilities may provide additional incentives for other chiller plant improvements that will reduce demand and save kWh such as Condenser Water Reset Controls, Economizers, etc. Incremental costs and energy savings calculations are required.
· Existing chillers that qualify for incentives under the accelerated chiller retirement guidelines shall be removed from service.
· If the chiller plant capacity increases, then the incentive will be determined by our Energy Conscious Blueprint (ECB) program rules. See note 1.
· Any chillers that have an existing Conservation Program contract are not eligible
Note 1. – The $600/ton reasonable cost cap will be applied to projects based on the lesser of the existing or proposed capacities.
Please use the following as guidelines for the information to be submitted :
The chillers must be 25 years or older. Validation of the age also needs to be submitted with the project. Photo of the nameplate information and spec sheet are the best. The guidelines call for a thorough analysis to be done comparing the chillers. Therefore, we would expect to see a report that follows an outline similar to the following. In addition, we should also be receiving a copy of the load simulations from the analysis.
1. Executive summary
2. Description of the existing chiller plant
3. Description of the sequence of operation for the existing chiller plant (non operational equipment should be clearly identified) for
4. all seasons
5. Description of the logic for calculating the existing energy consumption including statements as to the source of the known
6. data
7. Calculations for the energy consumption of the existing chiller plant
8. Description of the proposed changes to the chiller plant
9. Description of the sequence of operation for the proposed chiller plant
10. Calculations for the energy consumption for the proposed chiller plant with the new chiller that just matches the requirements of
11. the Connecticut Energy Code
12. Calculations for the energy consumption for the proposed chiller plant with the new high efficiency chiller
13. Statement of annual energy savings and demand reduction for both the code compliant chiller and the high efficiency chiller
14. Itemized cost estimate for the project identifying demolition, piping, electrical, mechanical, equipment, restoration,
15. engineering, overhead and contingencies
16. Measures not included under the Accelerated Chiller Retirement initiative that could receive incentives under the Energy
17. Opportunities program (Optional)
|
