Mashad trigeneration potential – An opportunity for CO2 abatement in Iran

Kalhori, Sahand Behboodi; Rabiei, Hossein; Mansoori, Z.

doi:10.1016/j.enconman.2011.12.027

Cited by 38 publications

(9 citation statements)

References 27 publications

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“…Although many scientists consider the cumulative effect, gained due to air cooling, calculated proceeding from CDH along with time elapsed (yearly CDH profile), 18,58 only some studies focus on analysing the character (rate of increment) of yearly cumulative cooling profiles versus thermal load when determining a design cooling load 27,28 and taking into account the rate of cumulative cooling characteristic increment (Radchenko A.et al 2020. 59 ) Practically all typical methods, that include summarizing the CDH number, are based on the approach that a design cooling capacity is to off set maximum requirements within the overall range of yearly operation.…”

Section: Introductionmentioning

confidence: 99%

A novel degree-hour method for rational design loading

Radchenko

Mikielewicz

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Cooling degree-hours (CDH) received the broadest application in evaluation of the ambient air cooling efficiency in power engineering (engine intake air cooling systems) and air conditioning. The current CDH numbers are defined as a drop in air temperature multiplied by associated time duration of performance and their summarized annual number is used to estimate the annual effect achieved due to sucked air cooling in power plants based on combustion engines (fuel saving, power output increment) and in air conditioning (refrigeration energy generation according to needs). A majority of approaches to designing ambient air cooling systems is proceeding from the cooling capacity of the chillers selected to provide a maximum current or annual CDH number with corresponding maximum current or annual effect (additional energy produced or fuel consumption reduction) in site climate location. But such approaches lead to inevitable oversizing the chillers and cooling systems in the whole. The analysis of intake air cooling efficiency in site varying climatic conditions, accompanied by quite a simple numerical simulation, enabled to reveal the potential of its enhancement and evaluate numerically the results of each step of designing in logical sequence. The new approaches to cooling system rational designing were introduced, that enables to synthesize and substantiate innovative principal decisions to exclude unproductive waste of installed (design) cooling capacity in actual operation. The innovative findings of methodological approaches include the use of the rate of annual CDH number increment as an indicator for selecting the optimum and rational values of design cooling capacity. The optimum cooling capacity corresponds to maximum rate of summarized annual CDH increment and maximum level of thermal loading accordingly, which provides minimum sizes of the chiller. In reality, it is a minimum permissible value of cooling capacity of the chiller installed and the overall ambient air cooling system. The rational cooling capacity, that enables to achieve practically maximum value of annual CDH and avoid chiller oversizing, is determined as the second, local, maximum of the rate in the summarized annual CDH over the range above the first one, global, maximum. A rational design cooling capacity determined by applying the novel methodology allows to decrease the ambient air cooling system sizes by 15 to 20% compared with traditional designing issuing from the peaked thermal load during a year. With this practically a maximum annual effect in fuel saving (energy generation or others) can be achieved too.

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Section: Introductionmentioning

confidence: 99%

A novel degree-hour method for rational design loading

Radchenko

Mikielewicz

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Many modern methods of analyses [58][59][60] are aimed to increase the effect gained due to ambient air processing, in particular, to reduce energy and fuel consumption. Some of such methods include calculation of cooling degree-hours (CDH) [14,61] and modified versions [62][63][64] to match current cooling duties according to actual climatic conditions as well as thermal demand management (TDM) [65,66] based on different criteria [67,68] to save energy in building conditioning, engine intake air cooling and combined cooling, heat and power.…”

Section: Introductionmentioning

confidence: 99%

“…Cooling degree-hour (CDH) calculations are widely used for evaluating the efficiency of application of ambient air cooling in site climatic conditions in power generation-combustion engine intake air cooling [63,64], as well as in air conditioning [62]. So as the performance efficiency of TIAC systems needs to be analyzed across the full range of operating conditions, the CDH number is used to determine the total amount CDHs in a particular climate over a considered period.…”

Section: Introductionmentioning

confidence: 99%

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Innovative Turbine Intake Air Cooling Systems and Their Rational Designing

et al. 2020

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The efficiency of cooling ambient air at the inlet of gas turbines in temperate climatic conditions was analyzed and reserves for its enhancing through deep cooling were revealed. A method of logical analysis of the actual operation efficiency of turbine intake air cooling systems in real varying environment, supplemented by the simplest numerical simulation was used to synthesize new solutions. As a result, a novel trend in engine intake air cooling to 7 or 10 °C in temperate climatic conditions by two-stage cooling in chillers of combined type, providing an annual fuel saving of practically 50%, surpasses its value gained due to traditional air cooling to about 15 °C in absorption lithium-bromide chiller of a simple cycle, and is proposed. On analyzing the actual efficiency of turbine intake air cooling system, the current changes in thermal loads on the system in response to varying ambient air parameters were taken into account and annual fuel reduction was considered to be a primary criterion, as an example. The improved methodology of the engine intake air cooling system designing based on the annual effect due to cooling was developed. It involves determining the optimal value of cooling capacity, providing the minimum system sizes at maximum rate of annual effect increment, and its rational value, providing a close to maximum annual effect without system oversizing at the second maximum rate of annual effect increment within the range beyond the first maximum rate. The rational value of design cooling capacity provides practically the maximum annual fuel saving but with the sizes of cooling systems reduced by 15 to 20% due to the correspondingly reduced design cooling capacity of the systems as compared with their values defined by traditional designing focused to cover current peaked short-term thermal loads. The optimal value of cooling capacity providing the minimum sizes of cooling system is very reasonable for applying the energy saving technologies, for instance, based on the thermal storage with accumulating excessive (not consumed) cooling capacities at lowered current thermal loads to cover the peak loads. The application of developed methodology enables revealing the thermal potential for enhancing the efficiency of any combustion engine (gas turbines and engines, internal combustion engines, etc.).

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“…On the other hand, economic constraints and environmental considerations make it necessary to improve the performance of energy conversion systems [1]. Combined Heat and Power (CHP) systems have emerged as an effective method of energy conversion due to involving both production of electricity and useful thermal energy in one operation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ambient Temperature on Exergetic and Exergoeconomic Parameters of a CHP System

Mohammadkhani¹,

Khalilarya²,

Mirzaee³

2013

JEFP

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Exergy analysis permits the localization and counting of the inefficiency degree informing the most inefficient components in a system and exergoeconomic analysis methodologies combine economic and thermodynamic analysis by exerting the cost concept to exergy. This paper presents exergetic and exergoeconomic analysis of a Diesel engine based Combined Heat and Power (CHP) system that produces 277 kW of electricity and 282 kW of heat. For this purpose, the CHP system is first thermodynamically analyzed through energy and exergy. Then cost balances and auxiliary equations are applied to subsystems, hence, cost formation in the plant is observed. The exergoeconomic analysis is based on specific exergy costing (SPECO) method. Finally a parametric study is used to show effect of ambient temperature on important energy, exergy and exergoeconomic parameters of the CHP system. The results show that increasing ambient temperature decreases the exergetic efficiency of the system but it has a positive effect on the work output, heating power and cost of exergy destruction.

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Mashad trigeneration potential – An opportunity for CO2 abatement in Iran

Cited by 38 publications

References 27 publications

A novel degree-hour method for rational design loading

A novel degree-hour method for rational design loading

Innovative Turbine Intake Air Cooling Systems and Their Rational Designing

Effect of Ambient Temperature on Exergetic and Exergoeconomic Parameters of a CHP System

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