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ENERGY OPTIMIZATION
CONCEPTS, PRACTICE, ACTION PLANS
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An Example of an Integrated Decentralized Energy System
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Introduction |
This paper contains my own personal dream on how the energy sector in the Philippines must optimize in order to survive and ride the tide.
It is written in Outline form so that points contained here could be amplified further. My professional experience in the power and energy sectors have brought me here. I have written the paragraphs that follow to propose new ways of approaching old engineering issues differently.
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New Energy |
This is a new approach to energy. It is important because as new energy, it enables us to psychologically alter our consciousness and treat the pursuit for new energy as an "investment". As such it carries with it an "internal rate of return" and "payback". Because it is investment, it is NOT like "cost" that flows down the river to never be recovered. Much of our planning and conceptualization is often colored by psychological preconceptions and baggage that engineering practice has imposed upon us.
What is "New Energy"?
Only a very small amount of energy in abundance in nature is collected. "New Energy" is the energy that would have been wasted away, but is now collected and used to do work or stored in an appropriate manner. Inherent Process Inefficiencies."New Energy" is also that which a manufacturing process would ordinarily waste into the atmosphere, but which we have succeeded in recovering in order to produce more work. The useful work would now be more than what it was because of this "new energy". The new efficiency of the optimized process would now become higher than what it was in the unoptimized process.
Many energy processes used today are inherently inefficient, and therefore, when we find ways of making them efficient, we have successfully mined new energy. First World to Third World.
Some of these inefficient processes are being dismantled in "first world" countries and sold to "third world" countries, leaving the latter with the burden of less efficient processes.
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Energy Estates |
In the same way that new energy is a new approach, the concept of "energy estates" is also new. This concept implies an integration and optimization in the use of energy from fuel. Fuel is delivered into the estate. Energy from it is utilized to the fullest extent possible and the remaining energy that can no longer be used is released to the atmosphere. I am claiming below that the concept of energy estate is, not only viable, but economically sound. 1 Use of Fuel We use part of the fuel to do work in a process and throw into the atmosphere as waste, that portion that we have not used. 2 The concept of an energy estate is one that * uses heat (or enthalpy - energy units for each unit of mass) from high levels of energy in one process, * cascade the lower level of energy to a next process and use enthalpy to do work there, * cascade the yet lower level of energy to a next process to do work there also, and so on, down the line. 3.3 The Case of Co-Generation Co-generation in Energy Estates is one form of this cascading process. * First Cascade. Fuel is burned in the combustion chamber of a gas turbine. The products of combustion, which will have a very high enthalpy level is sent to the turbine blades to turn the shaft and generate electricity (Useful Energy Source No 1). * Second Cascade. The hot gases from the exhaust still possess high levels of energy and are made to produce steam in a "waste heat recovery boiler" to provide steam for a steam turbine (Useful Energy Source No 2). * Third Cascade. The exhaust steam with a pressure of approximately 10 bars gage is sent to "Lithium-Bromide Absorption Chillers" to generate chilled water at 6 degrees Celsius for air-conditioning applications (Useful Energy Source No 3). * Fourth Cascade. The low level energy from the absorption chiller will be passed through a heat exchanger to recover the heat for drying applications (Useful Energy Source No 4). 4 Notice that the Second, Third, and Fourth Cascades are new energy. In cold countries, the "overall thermal efficiency" of such a process could exceed 90% in winter. Applications in the Philippines could easily realize an overall thermal efficiency of more than 65%. 5 Enormous Benefits If the overall thermal efficiency of the most efficient thermal power plant on the Philippine grid is 30%, then this system allows the user to extract more than double the energy in a liter of fuel that he uses. Such a system was bid out in 1998 and awarded in 2000, but was shelved because it was overtaken by the Asian financial crisis. 6 Law on "Buy Back" The existing Philippine law mandates that the utility buys back excess electricity generated by a co-generation facility, at the utility's "avoided cost" of generating electricity. This was patterned after the 1978 PURPA (Public Utility Regulatory Policies Act) of the United States federal government. |
Renewable Energy Resources |
The term renewable resources does not always mean renewable in its strictest sense. I like to give it a very broad meaning as those energy sources that do not come from fossil fuels. Historical engineering practice often prevents us from developing these resources because we often forget the fact that fuel oil is a commodity that can be bought and sold. As such it is prone to manipulation as many geopolitical economies and forces leverage this commodity for higher and higher profit. As a consequence, renewable resources are really not taken very seriously until the tight energy squeeze comes. Traditional engineering concepts like frequency, synchronous speed, grid interconnection, and the like have enclosed engineers around the world in a closed box. Engineers who dared think in terms of direct current stored in batteries and used directly or passed through inverters to provide alternating current for AC motors did not get much attention, let alone "funding". They are told to follow engineering practice as preached by global consultants hired by utilities and confirmed by engineering textbooks and handbooks. They are told that the project carried a very high unit investment (US$ per kilo-watt of installed capacity), and the payback time of the investment is either too long, or non-existent. I am proposing design changes and new configurations in the succeeding paragraphs. 1 Micro-Hydros * Run-of-River Hydro-Electric power plants are usually provided with an impounding dam to collect the water that will be sent to the hydraulic machine downstream to generate electricity. Such dams are called "storage dams" when they are able to collect plenty of water, and "run-of-river", when they simply stabilize the water flow into the hydraulic turbine. * Control Systems Such machines are often rated as 60 Hz or 50 Hz, depending on the geographical region in the world. The frequency thus severely restricts their shaft rotation to that which will generate the desired frequency, requiring sophisticated speed governors to control the frequency and automatic voltage controls to control the voltage and the power factor of the machine. * Design Changes In a new approach, there will be no need for a sophisticated speed governor, nor a sophisticated voltage control system. - The shaft will simply turn according to the water available, and generate whatever electricity is available from the power at the shaft. - The alternating current generated here is rectified into pulsating DC. - A less sophisticated "semiconductor-based switching" system provides high voltage charging current to large batteries. - Power from these batteries are usable as they are, or it could be converted into alternating current for use in AC motors, as may be required. 2 Wind The approach will be very similar to the one described for micro-hydros, above. 3 Tide The approach will be very similar to the one described for micro-hydros, above. 4 Wave The approach will be very similar to the one described for micro-hydros, above. 5 Ocean current at the Philippine Deep The approach will be very similar to the one described for micro-hydros, above. 6 Solar Water Heaters for Ocean-Thermal and Air-Conditioning Applications * Solar energy is collected using ordinary GI (galvanized iron) pipes. * It is sent to a heat exchanger to send the energy to a client process * Ocean-Thermal is one such process * Absorption refrigeration systems for air-conditioning is another example of such a process 7 Ocean-Thermal * This system assumes that it is environmentally sound to withdraw cold water from the Philippine Deep * The energy from the solar water heater is made to evaporate a refrigerant medium, or a petroleum compound * The vapor is used to drive a vapor turbine * Like the steam turbine, the shaft of the vapor turbine is also coupled to a generator to generate electricity. * The required energy gradient is provided by the cold water coming from the Philippine Deep, and it will cool the vapor in the turbine to condense it. * After the water has condensed the vapor, its temperature would become close to ambient, and will now be sent to an oyster farm or fish-culture farm to deliver the abundant nutrients that it carries with it. 8 Binary Cycles for geothermal and solar applications * These applications work in very much the same way as the Ocean-Thermal, with the exception that the cooling medium does not come from cold water from the Philippine Deep, but from a river, a deep-well, or a cooling tower. * The fluids from the energy source, i. e., geothermal and solar are isolated by heat exchangers from the fluids that go through the vapor turbines. * The heated medium will be converted into vapor to drive a vapor turbine. * The vapor is condensed in an atmospheric condenser which derives its cooling from water from a river, a deep-well, or a cooling tower. * In other words, replace the cooling medium here with water from deep in the ocean, and the system converts into an Ocean-Thermal installation. * The finer points of differences would be the working pressures, temperatures and fluid media. * The design will take cognizance of these. 9 Biomass The technologies in vogue here are usually related to the combustion of biomass, such as, * combustion of solid waste, rice hull, coconut husk, coconut shell, wood, etc. * straight combustion of municipal waste (garbage) * the incomplete combustion of garbage, coupled with a process to recover the resulting products and convert them into ethanol by a bacteria digestion process. 10 Bacteria Digestion * Several different digestion bacteria have been collected by different entities. * Some for the production of vinegar, others for the production of methane gas from human, animal, poultry, and vegetable waste. * Some bacteria are able to digest hot toxic liquid waste at 60-degree Celsius from sugar centrals into methane gas. * This gas is sent back to boilers or burned in other heating equipment. * The effluent liquids and solids are sent to the fields to become fertilizer for rice crops and other plants. 11 Recovery of Deuterium at the Philippine Deep * The Philippine Deep is said to have the largest supply of Deuterium in the world. * This substance is used in the development of fusion reactors in New Jersey and other centers. Some extract Hydrogen from Deuterium and use the Hydrogen as fuel. * Since the supply is within Philippine territory, the Philippines could potentially become the "supplier of choice" for Deuterium once the fusion reactors become commercialized. * Deuterium may be sold in its raw form and packaged in such a way that it does not disintegrate into plain Hydrogen gas, while in transit. * Another approach would be to set-up the facilities near the Philippine Deep and utilize Deuterium to produce Hydrogen and Oxygen gases to be exported for use in fuel cells around the world. |
Decentralized Energy Systems |
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Transport Sector |
The transport sector uses about 1/3rd of the total fuel import bills of the Philippines.
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Power Generation Sector |
This sector is considered so mature that approaches outside those defined by acceptable engineering practice and by the foreign consultants are not given a hearing.
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Power Transmission and Distribution Sector |
I have developed only a few radical ways of improving efficiencies is this sector.
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Manufacturing Sector |
My suggestion in this sector is to develop an "Energy Geographic Master Plan" that would provide zones to integrate the manufacturing sector, the power generation sector, and the energy estate.
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Small Sub- Projects |
These small sub-projects do not have wide-range impact, but are mentioned here to underline the possibility that these projects could result in efficiency improvements.
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Legislative Components |
I have been very candid and explicit in my discussion below, in order that the meanings of my statements are clearly stated.
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How to Proceed |
1 Priority Action - Establish a Five-Year Action Plan
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