Form 7-3 Input of Cogeneration Equipment¶
This chapter explains the evaluation method of cogeneration equipment, which is one type of energy utilization efficiency improvement equipment. The cogeneration equipment subject to evaluation is defined as follows:
- Equipment capable of simultaneously generating and supplying electricity and useful heat from one or more energy source. However, a gas-engine heat pump cooling/heating unit with a power generation function shall be evaluated as air conditioning equipment.
To evaluate the energy-saving effect of cogeneration equipment, it is necessary to enter, in “Form 7-3 (Efficiency Improvement) Cogeneration Equipment Input Sheet,” the power generation efficiency, waste-heat recovery rate, etc., based on the drawings that describe the specifications of the cogeneration equipment or the results of detailed calculations conducted separately. As an exception, even if cogeneration equipment is installed, it is permissible, for the time being, to undergo a review and inspection without preparing this Form 7-3, as if no cogeneration equipment were installed. In such a case, the energy-saving effect of the cogeneration equipment shall not be reflected at all in the designed primary energy consumption.
Cascade Ⅲ, which had been permitted for use in the Version 2 series, shall no longer be used starting from Version 3.0.
In the Energy Consumption Performance Calculation Program (Non-Residential Version), the cogeneration equipment that can be entered as input items shall be as follows. Any equipment not specified here shall be excluded from the input targets and treated as if not installed for the purpose of evaluation.
1) Equipment of gas-engine type that extracts waste heat as hot water.
For equipment that extracts waste heat as steam, it may be treated as equipment that extracts hot water for the purpose of calculation.
Gas turbines, fuel cells, and diesel engines are excluded from the input targets.
2) In cases where multiple units are installed and the user chooses to treat them as being of the same model and the same power generation output.
When multiple cogeneration units with different power generation outputs are mixed, it is permissible to enter the actual number of installed units in the field for a number of units, and the average power generation output in the field for generation output (assuming that multiple units with the same output are introduced). Also, for the power generation efficiency and waste-heat efficiency, the weighted average value by the rated power generation output of each unit may be entered.
3) Equipment that supplies both electric power and heat to the same system.
When electric power and heat are supplied to multiple systems, one representative system may be selected, and only the cogeneration equipment that supplies electric power and heat to that system may be entered.
The representative system shall be the one for which the sum of the rated cooling capacity (kW) of the heat source device that produces cooling heat using the waste heat from the cogeneration equipment and the rated heating capacity (kW) of the hot water supply equipment belonging to the same waste-heat utilization system is the largest.
4) Equipment in which all generated electric power and produced waste heat are self-consumed.
When electric power and/or waste heat are supplied to an external load, it may be evaluated as a system in which all are self-consumed (for the calculation it is assumed that the generated power is controlled not to exceed the electric demand, and surplus waste heat is released).
5) Equipment controlled for electricity demand-led operation.
When heat demand-led operation is adopted, it may be evaluated as electricity demand-led operation.
6) Equipment for which the destination of waste-heat utilization is subject to evaluation of primary energy consumption performance under the Energy Conservation Standard.
When waste heat is supplied to facilities outside the scope of energy consumption performance evaluation—such as for snow melting, freeze prevention, water reheating (bathing facilities, heated pools), or miscellaneous water uses (dishwashers, washing machines, etc.)—it may be evaluated as if no waste heat is supplied to those facilities.
However, gas-engine heat pump cooling / heating units with power generation function shall be evaluated as “Gas-Engine Heat Pump Cooling / Heating Unit (with Self-Sufficient Electricity Device)” under the heat source device types of air conditioning equipment.
Form 7-3 Cogeneration Equipment Input Sheet¶
Format of Cogeneration Equipment Input Sheet¶
The “Form 7-3 (Efficiency Improvement) Cogeneration Equipment" input sheet is shown in Figure 8-1-1.
Input Items and Methods for Cogeneration Equipment Input Sheet¶
The input items and input methods of the “Form 7-3 (Efficiency Improvement) Cogeneration Equipment" input sheet are shown below. The numbers in brackets preceding each Input item correspond to the numbers in brackets shown at the top of Figure 8-1-1.
(1) Name of Cogeneration Equipment¶
- Enter the name of the cogeneration equipment as a text string. In the Energy Consumption Performance Calculation Program (Non-Residential Version), each system is identified by this name, so care must be taken to ensure that names are not duplicated.
(2) Rated Power Generation Output¶
- Enter the rated power generation output of the cogeneration equipment as a numerical value.
- The entered value shall in principle conform to that specified in Table 8-2-1.
(3) Number of Units Installed¶
- Enter the number of installed cogeneration equipment units as a numerical value.
(4)(5)(6) Power Generation Efficiency (load factor 1.00, load factor 0.75, load factor 0.50)¶
- Enter the power generation efficiency (LHV, Lower Heating Value Basis) of the cogeneration equipment at load factors of 100% (1.00), 75% (0.75), and 50% (0.50), as specified in Table 8-2-1. Enter as a decimal number (e.g., 0.336), not as a percentage.
- Truncate the value to the fourth decimal place and enter up to the third decimal place.
(7)(8)(9) Waste Heat Efficiency (load factor 1.00, load factor 0.75, load factor 0.50)¶
- Enter the waste heat efficiency (LHV, Lower Heating Value Basis) of the cogeneration equipment at load factors of 100% (1.00), 75% (0.75), and 50% (0.50), as specified in Table 8-1-1. Enter as a decimal number (e.g., 0.507), not as a percentage.
- Truncate the value to the fourth decimal place and enter up to the third decimal place.
- For equipment that extracts waste heat as steam, enter the sum of the waste heat efficiency of hot water and that of steam.
| Performance item | Definition |
|---|---|
| Rated power generation output | Rated power output of the cogeneration unit (CGU) per JIS B 8121 |
| Power generation efficiency (load factor: 100%, 75%, 50%) | Power generation efficiency of the cogeneration unit (CGU) per JIS B 8122 * The load factor is the ratio of the CGU power output to the CGU rated power output. |
| Heat recovery efficiency (load factor: 100%, 75%, 50%) | Heat output efficiency of the cogeneration unit (CGU) per JIS B 8122 * The load factor is the ratio of the CGU power output to the CGU rated power output. |
(10)(11)(12) Priority Order of Waste Heat Utilization (Cooling Heat Source for Air Conditioning, Heating Heat Source for Air Conditioning, Hot Water Supply)¶
- Enter the priority order of waste heat utilization as text strings such as “1st,” “2nd,” and “3rd.” Use half-width numbers.
- For items without waste heat utilization among cooling heat sources, heating heat sources, and hot water supply, leave the relevant field blank.
- Waste heat utilization is evaluated only when used for cooling heat sources, heating heat sources, or hot water supply. And if used for other purposes, it shall be treated as if no waste heat is supplied to them.
(13) Presence or Absence of 24-Hour Operation¶
- If the cogeneration equipment operates up to a maximum of 24 hours per day under normal conditions, enter “Present.” If it does not operate 24 hours per day, leave the field blank.
When it does not operate 24 hours per day, the operation shall be assumed to be a maximum of 14 hours per day.
(14) Waste Heat Utilization System (Air Conditioning Heat Source Group – Cooling Heat Source)¶
- From the heat source group names entered in Figure 2-5-2 “Form 2-5 (Air Conditioning) 'Heat Source Input Sheet,'” select one heat source group name that belongs to the same system as the waste heat utilization system of the cogeneration equipment and enter it as text.
- Among the heat source devices forming the heat source group, those that produce cooling heat using the waste heat of the cogeneration equipment shall be one of the heat source device models listed in Table 8-1-2 among the heat source device models entered in the “(6) Heat Source Device” column of the “Form 2-5 (Air Conditioning) 'Heat Source Input Sheet.'”
Even when “Absorption Chiller (Steam)” or “Absorption Chiller (Hot Water)” is selected as the heat source device that produces cooling heat using waste heat from the cogeneration equipment, the program internally calculates it as if the waste heat is utilized by an “Absorption Chiller (Single-Double Combined Type).”
- If there is no waste heat utilization, leave the field blank.
| Model | Fuel type | Cooling | Heating |
|---|---|---|---|
| Absorption chiller (steam) | Steam | ○ | |
| Absorption chiller (variable cooling water flow, steam) | Steam | ○ | |
| Absorption chiller (hot water) | Hot water | ○ | |
| Absorption chiller (single/double-effect combined, city gas) | City gas | ○ | ○ |
| Absorption chiller (single/double-effect combined, variable cooling water flow, city gas) | City gas | ○ | ○ |
| Absorption chiller (single/double-effect combined, LPG) | LPG | ○ | ○ |
| Absorption chiller (single/double-effect combined, variable cooling water flow, LPG) | LPG | ○ | ○ |
| Absorption chiller (single/double-effect combined, steam) | Steam | ○ | |
| Absorption chiller (single/double-effect combined, variable cooling water flow, steam) | Steam | ○ |
(15) Waste Heat Utilization System (Air Conditioning Heat Source Group – Heating Heat Source)¶
- From the heat source group names entered in Figure 2-5-2 “Form 2-5 (Air Conditioning) 'Heat Source Input Sheet,'” select one heat source group name that belongs to the same system as the waste heat utilization system of the cogeneration equipment and enter it as text.
- If there is no waste heat utilization, leave the field blank.
(16) Waste Heat Utilization System (Hot Water Supply Equipment)¶
- Among the names of hot water supply equipment entered in Figure 5-2-1 “Form 5-2 (Hot Water Supply) 'Hot Water Supply Equipment Input Sheet,'” select one that belongs to the same system as the waste heat utilization system of the cogeneration equipment and enter it as text.
- If there is no waste heat utilization, leave the field blank.
(17) Remarks¶
- This field is for memos during data entry and is not used in the calculation, so entry is optional.