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Reducing Light, Fuel & Water Expenses

Category:relating to "Reducing Light, Fuel & Water Expenses"

  • Renewal

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We help you make a diagnosis of your company's energy consumption.

We will first ask you to provide us with; facility-related system flow sheets, a list of equipment, and the data on your energy consumption over the last three years. Then, based on that information, we will create a proposal outlining the estimated possible volume of light and fuel cost reductions in an energy-saving approach for operations.

Case Study (Plant A)

Reducing primary energy use by 13% and CO2 emissions by 28%

  • Water-cooled screw cooling machine 2 422kW/1 693kW
  • Super-temperature-stratified heat storage tank 900m3 [2,000USRT]

Primary energy reduction effects

Primary energy use reduced by 13%

CO2 emission reduction effects

CO2 emissions reduced by 28%


Adopted super-stratified heat storage tank

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Case Study (Government building B [total floor area 96,000m2])

Cutting 34 million yen annually from light and fuel expenses

Energy consumption

Energy consumption reduced by 16%

CO2 emissions

CO2 emissions reduced by 17%

Light, fuel, and water expenses

Light, fuel, and water expenses reduced by 12%

Main Energy-saving & Validation Methods

No. Renewal Item Description
1 Renewal of absorption chiller heaters Absorption chiller heaters (2 x 770 USRT units) are replaced with highly-efficient equipment (2 x 770USRT units).
2 Inverter control of the cooling water pumps in the absorption chiller heaters The cooling water pumps in absorption chiller heaters are placed under the inverter control, based on the outlet temperature of their cooling water.
3 Change in the control of the chilled/hot water pumps in absorption chiller heaters Modified control of the chilled/hot water pumps in absorption chiller heaters.
4 Variable flow control of the cooling water pumps in absorption refrigerating machines The cooling water pumps in absorption refrigerating machines are placed under the variable flow control.
5 Variable flow control of the cooling and cold waters in turbo refrigerating machines and a change in operational methods The cooling and cold waters in turbo refrigerating machines are placed under variable flow control, and ice-chillers are replaced with the turbo refrigerating machines.
6 Changes to the quantity control settings for the secondary pumps The quantity control settings for secondary chilled/hot and cold water pumps are modified.
7 Air-conditioning control system update The control system of the air conditioning unit is updated for more efficient operation.
8 Air-conditioner outside-air intake control The intake of outside-air is controlled, based on the CO2 concentration in the air that is ventilated with air conditioners.
9 Change in the variable air volume control for the air blowers in air conditioners Modified variable air volume control for the air blowers in air-conditioners.
10 Changes to parking lot ventilation control Ventilation fans are controlled based on CO2 concentration. Circulation fans are interlocked with the ventilation fans.

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Case Study (Case of hospital C [total floor area 25,000m2])

Cutting 46 million yen annually from light and fuel expenses

On a primary energy use basis

Primary energy consumption reduced by 25%

CO2 emissions

CO2 emissions reduced by 39%

Light, fuel, and water expenses
(on a crude oil basis)

Light, fuel, and water expenses reduced by 28%

Main Energy-saving Methods

Item Description
Installation of a gas-engine Cogeneration System [Validation points]
Electricity output, gas consumption, waste heat utilization, and power consumption are measured over a long period of time, delivering energy savings and cost efficiency as planned.
[Validation check points]
Measuring instruments are installed for observing the following points:
  • Gas flow rate, electricity output, supplied power, volume of water heated with waste heat, and temperatures of water heated with waste heat (on circulating and exhausting cycles)
  • Electric energies for waste heat pumps and the circulation pumps on the preheating tank side
Inverter lighting apparatus and high-intensity guidance lights [Before renewal]
The power for certain circuits is measured on the lighting panel board with a cramping power meter.
[After renewal]
The effect is observed with a measurement for the same circuit on the same panel board. This procedure is repeated for the panel board in each building.
Validation of energy saving for a heat source system Daily and monthly reports on the light, fuel, and water expenses and operation management, as well as gas consumption data is received from the manager of facilities on a regular basis. Estimated energy-saving impacts and actual measured values are compared and verified periodically.
Inverter equipment measurement validation An integrated wattmeter is installed in the equipment with an inverter. On each regular visit, data on changes such as modification of operation hours are checked, with the manager of facilities, for recording. Based on the measured data and operating times, a difference between the power consumed in normal operation and in inverter operation are verified. The power consumption in normal operation is derived from the current values of target equipment before the installation of an inverter.
Validation of water-saving effects This is based on a computational estimation of water saving. After the initiation of the ESCO services monthly data on actual water savings is received from the manager of facilities for verification.
Well water cleaning system The volume of cleaned well water is measured to estimate the current reduction of clean water. The power consumed by the system is measured with a power meter.

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