Increasing Heat Load Research Articles

Association between heat waves and number of deaths for old-age in slovenia, from 2013 to 2017

Abstract Background Heat waves are associated with incresed mortalitiy, especially in old-age population. Methods We estimated relative risks for number of deaths, for the observed diagnoses, sex, and area, as well as 95% confidence intervals and excess deaths associated with heat waves occurring in the years from 2013 to 2017, for population 75+ years old. Results Statistically significant were: in 2014: all causes of deaths (RR = 1.27, CI 1.12-1.44); male, all causes of deaths (RR = 1.27, CI 1.04-1.56); female, all causes of deaths (RR = 1.26, CI 1.08-1.48); all, circulatory system diseases (RR = 1.19, CI 1.01-1.43); female, circulatory system diseases (RR = 1.23, CI 1.01-1.51); rural area (RR = 1.28, CI 1.09-1.51); urban area (RR = 1.35, CI 1.11-1.64); and in 2015: all causes of deaths (RR = 1.28, CI 1.15-1.41); male, all causes of deaths (RR = 1.27, CI 1.08-1.5); female, all causes of deaths (RR = 1.27, CI 1.12-1.45); all, circulatory system diseases (RR = 1.27, CI 1.1-1.48); male, circulatory system diseases (RR = 1.38, CI 1.06-1.79); female, circulatory system diseases (RR = 1.23, CI 1.03-1.47); rural area (RR = 1.31, CI 1.16-1.47). No significant association in 2013, 2016 and 2017 appeared. Conclusions Despite increasing heat load in observed years, we did not notice a statistically significant association between heat waves and the number of deaths in the last observed years 2016 and 2017. The results indirectly show that we are on good way with our public health efforts concerning awareness of Slovenian people about the dangers heat waves bring. Key messages Heat waves will become more intense, will last longer and will appear more frequent. We must take care after old age population. Chronic noncommucating diseaes increase and life expectancy also increases, so the burden of deaths during heat waves is expected to increase too.

Inter-local climate zone differentiation of land surface temperatures for Management of Urban Heat in Nairobi City, Kenya

Rapid Urbanisation often leads to the formation of Urban Heat Island (UHI), which is believed to link to the characteristics of a city. Proper management of UHI, would, therefore, require recognition of the possible range of heat load increase. This paper presents results of inter-local climate zone (LCZ) differentiation of land surface temperature (LST) for the management of urban hotspots in Nairobi city. WUDAPT methodology and LST_Landsat_8_split_window toolbox were used to generate LCZ and LST maps, respectively. Nairobi LCZs had a unique thermal climate that showed statistically significant differences (< 0.05) in mean LSTs among typical LCZs. LST patterns exhibited sensitivity to building densities and heights, land cover types and surface wetness. Dry and Natural zones were more thermally responsive than wet and built-up zones. However, build-up LCZs with heavy industry, compact buildings, lightweight lowrise (slums) and large lowrise buildings were characterised with warmer LSTs while natural LCZs with water bodies, dense trees and sparsely built classes were associated with slightly lower LSTs. The findings further demonstrate and support the use of LCZs for the delimitation and investigation of the influence of complex urban morphology on local climate formation in an equatorial city like Nairobi.

Experimental study and steady-state model of a novel plate loop heat pipe without compensation chamber for CPU cooling

In this study, a new type of loop heat pipe (LHP) without compensation chamber is designed and manufactured, meanwhile the liquid line is fitted with a sintered wick to enhance startup and steady operation capacity. Specifically, the thermal characteristics of the LHP are studied experimentally. The results show that the LHP can start up smoothly at any heat load and the highest temperature of LHP does not exceed 90 °C. The fluid at the liquid line is subcooled, which is beneficial for the startup and steady operation of LHP. When the heat load is in range of 10 W to 50 W, the LHP works at variable conductance mode, and the system thermal resistance and the loop thermal resistance both decrease sharply with the increasing heat load. When the heat load is in range of 50 W to 150 W, the LHP enters a constant conductance mode, and the system thermal resistance and the loop thermal resistance remain basically constant. Besides, the steady-state model of LHP used to predict the operating temperature of LHP is established. The simulation results were compared with the experimental data, and the maximum relative error of evaporator, vapor, condenser outlet and liquid line wick inlet temperature are less than 15%.

Performance Analysis of Vapour Compression Refrigeration System with Serpentine and Spiral Condensers by Using R600a

The present work is to analyse the performance of VCRS system with two condensers i.e., Serpentine and Spiral tube using Isobutane (R600a) refrigerant. These two condensers are kept in parallel with other components of refrigerating unit while construction. The performance of refrigeration system is checked for each condenser at various cooling loads. The performance of the condenser is measured for whole refrigeration unit in terms of C.O.P, compressor work, Efficiency of the system, Heat Rejection Ratio, and Heat Rejected from Condenser. The result will show that for both condensers for refrigerant R600a, coefficient of performance increases with increase in heating load, increase in refrigerating effect and decrease in compressor work. From the analysis of two condensers, coefficient of performance of refrigeration system using serpentine and spiral condenser VCRS is more compared to conventional VCRS. Also, R600a gives better cooling effect than tetrafluroethane (R134a). The substitution of R134a by R600a is useful in order to generate a good thermo-economic output, zero ODP (Ozone Depletion Potential) and very low GWP (Global Warming Potential).

Implications of indoor air temperature variation on the health and performance of Brazilian students

The aim of the present study was to evaluate the relationship between cognitive performance, health and environmental comfort as a function of indoor air temperature (Ta) variation. A total of 360 undergraduate students were subjected to the variation of the Ta at 20, 24 and 30 °C; their thermal responses were evaluated over three consecutive days. Performance variables measured in the study were cognitive performance, blood pressure, heart rate (HR) and comfort. The environmental variables measured were Ta, globe temperature (Tg), illumination, noise, airflow velocity and air quality. The variation in HR was influenced by the variables, relative air humidity and mean radiant temperature (Trm) during the three days of observation, where HR was higher than 100 bpm when Tg was greater than Ta. Trm increased proportionally to the increase in Tg, thus characterising heat exchange by radiation. The number of correct answers and test response time were also positively influenced by Trm when Ta was 20 °C. Teaching environments (TEs) with increased heat load due to the individual body heat of students, increased outdoor Ta and urban morphology associated with the building of the TEs result in increasing in Trm due to the Tg being higher than the air temperature, with possible impacts on health and performance variables.

Visualization study on the heat and mass transfer in the evaporator-compensation chamber of a loop heat pipe

To visually analyze the flow and heat transfer characteristics of the working fluid in a loop heat pipe (LHP), the evaporator-compensation chamber (CC) was designed as a half-sectioned cylindrical structure sealed with a glass window. Using acetone as the working fluid, visualization experiments were performed under different heat loads and tilt angles. The vapour-liquid distribution in the evaporator-CC coupling structure and the temperature variation characteristics of the LHP system were investigated at three tilt angles of the evaporator-CC coupling structure. According to the experimental results including the startup and steady-state operation, some important conclusions have been drawn as summarized below: (1) with the subcooled liquid outflow from the bayonet tube, the vapour-liquid interface in the evaporator-CC coupling structure rises when the heat load is applied to the evaporator; (2) the bubble generation inside the porous wick becomes more intense with an increased heat load, and there are various bubble movement patterns at different tilt angles; (3) the temperature fluctuation of the LHP system is closely related to the oscillation of the vapour-liquid interface in the evaporator core.

Heat Transfer Behavior of Green Roof Systems under Fire Condition: A Numerical Study

Currently, green roof fire risks are not clearly defined. This is because the problem is still not well understood, which raises concerns. The possibility of plants catching fire, especially during drought periods, is one of the reasons for necessary protection measures. The potential fire hazard for roof decks covered with vegetation has not yet been fully explored. The present study analyzes the performance of green roofs in extreme heat conditions by simulating a heat transfer process through the assembly. The main objective of this study was to determine the conditions and time required for the roof deck to reach a critical temperature. The effects of growing medium layer thickness (between 3 and 10 cm), porosity (0.5 to 0.7), and heating intensity (50, 100, 150, and 200 kW/m2) were examined. It was found that a green roof can protect a wooden roof deck from igniting with only 3 cm of soil coverage when exposed to severe heat fluxes for at least 25 minutes. The dependency of failure time on substrate thickness decreases with increasing heating load. It was also found that substrate porosity has a low impact on time to failure, and only at high heating loads.

Experimental investigation of loop heat pipe with a large squared evaporator for multi-heat sources cooling

A heating area of 190 mm × 90 mm large flat-plate loop heat pipe was designed for the heat dissipation problem of multi-heat sources. The design process was also briefly introduced. The evaporator was made of aluminum alloy, and heat dissipation fins were arranged on the back side of the compensation chamber to enhance the heat transfer between the compensation and the ambient. The stainless steel wire mesh worked as the porous wick, and the acetone was chosen as the working fluid. Six ceramics heating blocks were used as the heat sources. The results showed that the system could start up and work normally between 20 W–140 W, and maintained the heating surface temperature below 90 °C. The system behaved as a zigzag start below 20 W, and the condenser inlet temperature oscillated periodically, and the system could start up stably between 25 W and 140 W. When the heat load was increased, there occurred periodic temperature fluctuation in condenser outlet. The system could establish a new balance quickly during variable heat loads operation, which reflected the good reliability of the LHP. The experiment of changing the heat dissipation condition on the condenser side and the evaporator side was carried out. When the heat load was 120 W and the ambient temperature was constant, the system equilibrium temperature difference caused by the air ventilation of the condenser was changed, which was less than the heat dissipation of the evaporator under the same conditions. The evaporator thermal resistance decreased with the increase in heat load, and the minimum thermal resistance of 0.032 °C/W was achieved at the heat load of 120 W. The total thermal resistance of the LHP was distributed between 0.312 °C/W and 0.212 °C/W. It was also pointed out that it was very important to improve the thermal uniformity of the heated surface of a large-plane loop heat pipe system with multiple heat sources.

Drop Evaporation on Rough Hot-Spots: Effect of Wetting Modes

Hot-spots are a common occurrence in power electronics which become increasingly hotter as chips become denser. Novel cooling technologies are emerging to cope with this increasing heat load, which imbed a condenser to supply cooling drops to the evaporator resting on the hot-spots. Nonetheless, the evaporation process of the drops has been overlooked. Here, we conducted a series of experiments to understand how the evaporation and motion of drops are influenced by the wetting mode of rough hot-spots. We fabricated three different surfaces exhibiting full (Wenzel) or partial (Cassie–Baxter) wetting and the hot-spot is imposed by laser irradiation. We report a direct link between drop motion and wetting mode with the partial wetting drops being highly mobile, attributable to lower pinning energy based on an energy analysis. This study provides a framework for future modifications in hot-spot cooling to account for drop motion which should greatly influence the overall heat removal performance.

Is edible insect as a novel food digestible?

This work deals with the digestibility of a selected species of edible insect - mealworm (larvae) as novel food in dependency on its culinary treatment. The aim of this work was to find suitable thermic culinary treatment of mealworm larvae considering its optimum digestibility by human. The digestibility of materials from whole insect and extracted nitrogenous substances was determined using three different culinary treatments - without culinary treatment (freshly killed), dried insect and roasted insect. The digestibility was determined by gravimetric in vitro method using pepsin and pancreatin enzymes and their combination. The total nitrogen content of the insect samples was determined by the Kjeldahl method. The digestibility of the whole homogenized larvae using the combination of pepsin and pancreatin enzymes, thus simulating human digestion in-vitro, ranged from 81% for roasted specimens to 91.5% for culinary unprocessed insect. Similarly, the digestibility of nitrogenous substances of homogenized insect samples using this combination of enzymes ranged from 24.2% for roasted specimens to 80.2% for culinary unprocessed samples. The work showed the dependence of the digestibility of the mealworm larvae on the culinary treatment - the increasing heat load of the sample reduced the digestibility. Furthermore, it proved the effect of the digestive enzyme on the digestibility of the insect sample.&#x0D;

МОДЕЛЮВАННЯ ПРОЦЕСІВ ОХОЛОДЖЕННЯ ПОВІТРЯ БРОМИСТОЛІТІЄВОЮ ХОЛОДИЛЬНОЮ МАШИНОЮ З ВИКОРИСТАННЯМ РЕЗЕРВУ ХОЛОДОПРОДУКТИВНОСТІ У БУСТЕРНОМУ ПОВІТРООХОЛОДЖУВАЧІ

The heat-humidity processes of gas turbine unit intake air cooling to the temperature of above 15 °C with the use of a cold water at the temperature of about 10 °C as a coolant and the absorption lithium-bromide chiller utilizing the turbine exhaust gas waste heat as a thermotransformer has been analyzed for daily changing ambient air temperatures and changeable heat loads on the air coolers as consequence. The computer programs of the firms-producers of heat exchangers were used for gas turbine unit intake air cooling processes simulation. It is shown that at decreased heat loads on the air cooler a surplus cooling capacity of the absorption lithium-bromide chiller exceeding current heat loads is generated which can be used for covering an increased heat loads on the air cooler and to reduce the cooling capacity of the absorption lithium-bromide chiller applied. To solve this task the cooling capacity required for gas turbine unit intake air cooling are compared with the surplus cooling capacity of the absorption lithium-bromide chiller exceeding current heat loads summarized during some period.The system of two-stage gas turbine unit intake air cooling with a buster stage of precooling air to the temperature of about 15 °C and a base stage of further cooling air to the temperature of about 15 °C by absorption lithium-bromide chiller as the base stage has been proposed. The water for a buster stage of precooling air is cooled by using the surplus cooling capacity of the absorption lithium-bromide chiller during decreased heat loads on the two-stage gas turbine unit intake air cooler and is collected in the thermal accumulator for the use during increased heat loads on the air cooler. The results of gas turbine unit intake air cooling processes simulation proved the reduction of cooling capacity of the absorption lithium-bromide chiller applied by 30-40 % due to the use of a buster stage of precooling air at the expanse of the surplus cooling capacity of absorption lithium-bromide chiller saved in the thermal accumulator. So the main conclusion has been made about the efficient use of such a two-stage air cooling with a buster stage of precooling air by surplus cooling capacity from the thermal accumulator and a base stage for further cooling air to the temperature of about 15 °C by an absorption lithium-bromide chiller as a perspective approach in refrigeration.

Experimental investigation of flat plate closed loop pulsating heat pipe

Pulsating heat pipes (PHPs) have promised to be effective heat spreaders. From the fabrication perspective, the PHPs are less intensive than their conventional counterparts. Despite the advantages, there still exists shortage of data in both experimental and analytical domains towards reliable design and prediction of PHP performance. In this study, a flat plate closed loop PHP has been experimentally investigated for its thermal performance. The PHP with 12 channels, each 2.2 mm deep × 2.0 mm wide, was tested with deionized water for a fill ratio of 70% by volume for various orientations starting from vertical evaporator below condenser (90°) to near horizontal (7.5°) orientation for a single heat load of 50 W to calibrate the test setup against published literature. The PHP was also tested for methanol with various fill ratios (30, 40, 50, 60 and 70%) for 50 W. The best performing fill ratio of methanol was tested for various heat loads (10 to 100 W) for the vertical and the near horizontal orientation. An attempt has been made to resolve the critical angle after which the PHP ceases to perform when tilted towards horizontal orientation. The PHP performance as expected was best at the 90° (vertical) orientation with very little deterioration up to 45°. The thermal resistances were estimated for two fluids, for various orientations, heat loads and fill ratios. The results indicate that at near horizontal orientation methanol performed better than water for 70% fill ratio. The 40% fill ratio of methanol yielded the least thermal resistance for all orientations. Also the thermal resistance of the PHP decreased with increasing heat load for different orientations. The PHP operated successfully up to 7.5–10° below which the PHP was observed to have dry out.

Optimization of high heat flux components for DIII-D neutral beam upgrades

Upgrade of the DIII-D neutral beams leads to enhanced heat loads on many components, such as calorimeter, collimator, and pole shields which protect neutral beam magnets. Power increase from 2.6 MW to 3.2 MW per source leads to a normal heat flux loads of up to 55 MW/m2 for the calorimeter. The Princeton Plasma Physics Laboratory is responsible for the design and manufacturing of the upgrades of these components.Heat flux distribution on neutral beam components is very uneven and leads to significant thermal stresses. High heat flux density impact requires surface optimization to reduce surface heat flux projection, and avoid localized melting. Several new design features were introduced to accommodate increased heat loads, such as molybdenum inserts for the pole shields, two-dimensional shaping for the calorimeter, and three-dimensional shape optimization and replaceable copper inserts for the collimator. Additionally, all three components include an optimized cooling system design featuring peripheral cooling of copper components.The optimization process included applying analytical relations for the transient temperature distributions on the high heat flux components. These relations were confirmed by previous DIII-D experimental results. To validate the designs, numerical simulations were performed. Results of the design optimization and numerical simulations will be presented.

Application of interference fits on cylindrical monochromator crystals to overcome clamping and cooling deformations.

In order to provide adequate cryogenic cooling of both existing and next-generation crystal monochromators, a new approach to produce an optimum thermal interface between the first crystal and its copper heat exchanger is proposed. This will ensure that the increased heat load deposited by higher X-ray powers can be properly dissipated. Utilizing a cylindrical silicon crystal, a tubular copper heat exchanger and by exploiting the differing thermal and mechanical properties of the two, a very good thermal interface was achieved at liquid-nitrogen temperatures. The surface flatness of the diffracting plane at one end of the cylindrical crystal was measured at room temperature while unconstrained. The crystal was then placed into the copper heat exchanger, a slide fit at room temperature, and then cooled to liquid-nitrogen temperature. At -200°C the slide fit became an interference fit. This room-temperature `loose' fit was modelled using finite-element analysis to obtain the desired fit at cryogenic temperatures by prescribing the fit at room temperature. Under these conditions, the diffraction surface was measured for distortion due to thermal and mechanical clamping forces. The total deformation was measured to be 30 nm, an order of magnitude improvement over deformation caused by cooling alone with the original side-clamped design this concept method is set to replace. This new methodology also has the advantage that it is repeatable and does not require macro-scale tools to acquire a nanometre-accuracy mounting.

High-frequency transition characteristics of synthetic natural gas combustion in gas turbine

AbstractIn this study, the combustion instability and emission characteristics of flames of different H2/CH4compositions were investigated in a partially premixed model gas turbine combustor. A mode shift in the frequency of instability occurred under varying experimental conditions from the first to the seventh mode of longitudinal frequency in the combustor, and a parametric study was conducted to determine the reasons for this shift by using the length of the combustor, a factor that determines the mode frequency of longitudinal instability, as the main parameter. Furthermore, heat load and fuel composition (H2ratio) were considered as parameters to compare the phenomenon under different conditions. The GRI-3.0 CANTERA code, OH chemiluminescence and the Abel inversion process were applied to analyse the frequency mode shift. NOxemissions, which occurred through the thermal NOxmechanism, increased with increasing heat load and H2ratio. The instability frequency shifted from the first to the seventh mode as the H2ratio increased in the H2/CH4mixture. However, 100% H2as fuel did not cause combustion instability because it has a higher burning velocity and extinction stretch rate than CH4. Furthermore, the laminar flame speed influenced the frequency mode shift. These phenomena were confirmed by the flame shapes. The Abel inversion process was applied to obtain the cross section of the flames from averaged OH chemiluminescence images. Stable and unstable flames were identified from the radial profile of OH concentration. The combustor length was found to not influence frequency mode shift, whereas the H2ratio significantly influenced it as well as the flame shape. The results of this experimental study can help in the reliable operation of gas turbine systems in SNG plants.

Experimental investigation on the concentration distribution behaviors of mixture in an ejector enhanced auto-cascade refrigeration system

In this paper, the concentration distribution behaviors of the mixture R134a/R23 in an ejector enhanced auto-cascade refrigeration cycle (EARC) were experimentally investigated. Relationships between circulating concentration and charged concentration were explored, and the effects of the heat load and ambient temperature on the composition shift characteristics were analyzed. The results indicated that large composition shift occurred at the operation conditions, and the circulating concentration of the low boiling temperature component R23 at the condenser inlet was 25.9–38.1% higher than that in charge due to the differential hold-up of individual refrigerant components in two-phase region. The concentrations of the component in charge and circulation had a linear relationship in EARC, which was similar to those in conventional auto-cascade refrigeration cycle and Joule–Thomson refrigerator, even though these cycles were different in cycle configurations, mixture and operation conditions. R23 showed higher circulation concentration at higher ambient temperature. As the increasing heat load, the circulating concentration of R23 at the condenser inlet first increased and then decreased. In addition, different preferential solubility of individual components in the lubricating oil led to 15.4% richer R23 before the system start-up than that charged. The circulating concentration varied drastically at the early stage of the pull-down process and then tended to be stable over time. The largest shift of the circulation concentration from the charged concentration in the pull-down process reached 32.6%. This work could provide an in-depth understanding of the behaviors of the mixture concentration in the ejector enhanced auto-cascade refrigeration system.

Managing leading edges during assembly of the Wendelstein 7-X divertor

Divertor target plates of magnetic confinement experiments are usually intersected by the magnetic field under a shallow angle. If steps are present in the target surface, the resulting leading edges will receive a strongly increased heat load as compared with the surrounding target surface. A very precise alignment of the target components is required to limit the height of leading edges in all magnetic configurations. In preparation of the initial divertor operation phase of the Wendelstein 7-X stellarator, we combined a model calculating the thermal load pattern on the targets for each magnetic configuration with a time-dependent model for heat transport within the targets, with a model for carbon sublimation and with measurements of step heights between target components to estimate the carbon sublimation rates to be expected. In a few locations of the as-built and as-installed divertor, these were found to be critically high, such that a limitation of plasma performance might have resulted. By re-aligning one type of target component according to the results of our modelling, the expected carbon sublimation rates were strongly reduced to uncritical levels.

Effect of evaporator tilt on a loop heat pipe with non-condensable gas

The coupling effect of non-condensable gas (NCG) and evaporator tilts on the steady state operation of a loop heat pipe (LHP) was investigated both experimentally and theoretically in this work. Nitrogen was injected quantitatively into an ammonia-stainless steel LHP to simulate NCG, and the steady state characteristics of the LHP were studied under three typical evaporator tilts. According to the experimental results, the main conclusions below can be drawn. (1) The temperature is the highest under adverse tilt and the lowest under favorable tilt no matter whether there is NCG in LHP. (2) The existence of NCG could cause the increase of temperature under all three typical evaporator tilts, but the temperature increment caused by NCG seems to be relatively small under adverse tilt. (3) The increments of the temperature caused by NCG display different patterns under different tilts. Theoretical analysis was conducted to explain the results: the temperature under the coupling effect of NCG and evaporator tilt was determined by the energy balance between the heat leak from evaporator to compensation chamber and the cooling capacity of returning subcooled liquid. With the increase of heat load, the augmentation of heat leak caused by NCG and the enhancement of subcooled liquid cooling effect were incongruent. The coupling effect of NCG and evaporator tilts should be considered in the terrestrial application of LHP.

Visualization Study of Startup Modes and Operating States of a Flat Two-Phase Micro Thermosyphon

The flat two-phase thermosyphon has been recognized as a promising technique to realize uniform heat dissipation for high-heat-flux electronic devices. In this paper, a visualization experiment is designed and conducted to study the startup modes and operating states in a flat two-phase thermosyphon. The dynamic wall temperatures and gas–liquid interface evolution are observed and analyzed. From the results, the sudden startup and gradual startup modes and three quasi-steady operating states are identified. As the heat load increases, the continuous large-amplitude pulsation, alternate pulsation, and continuous small-amplitude pulsation states are experienced in sequence for the evaporator wall temperature. The alternate pulsation state can be divided into two types of alternate pulsation: lengthy single-large-amplitude-pulsation alternated with short multiple-small-amplitude-pulsation, and short single-large-amplitude-pulsation alternated with lengthy multiple-small-amplitude alternate pulsation state. During the continuous large-amplitude pulsation state, the bubbles were generated intermittently and the wall temperature fluctuated cyclically with a continuous large amplitude. In the alternate pulsation state, the duration of boiling became longer compared to the continuous large-amplitude pulsation state, and the wall temperature of the evaporator section exhibited small fluctuations. In addition, there was no large-amplitude wall temperature pulsation in the continuous small-amplitude pulsation state, and the boiling occurred continuously. The thermal performance of the alternate pulsation state in a flat two-phase thermosyphon is inferior to the continuous small-amplitude pulsation state but superior to the continuous large-amplitude pulsation state.

Ability of adjusting heating/power for combined cooling heating and power system using alternative gas turbine operation strategies in combined cycle units

Gas turbine combined cycle (GTCC) based combined cooling, heating and power (CCHP) or combined heating and power (CHP) system driven by natural gas is encouraged to set up for district heating/cooling demand in China due to the clean and efficient energy conversion. This paper presents a GTCC based CCHP system, which consists of a heavy-duty gas turbine, triple-pressure heat recovery steam generator (HRSG), steam turbines, heat exchanger and absorption chiller. Turbine inlet temperature (TIT) strategy and inlet guide vanes (IGV) strategy for the gas turbine are adopted to access the part load performance. The energy distribution and exergy destruction of the CCHP system are investigated under different gas turbine loads. The primary energy saving rate (PESR) and carbon dioxide emission rate (CDER) are set up to evaluate the system at various gas turbine loads and steam extraction ratios. The ability of shaving peak power for the system is investigated. The results show that IGV plays a role in increasing the steam turbine power output and reducing the exhaust heat in HRSG but causes more exergy destruction in the steam turbine expansion process. The PESR and CDER have been enhanced as the steam extraction ratio increases for the same gas turbine load. The IGV strategy reinforces the part-load performance of the CCHP system. For instances, the PESR has been enhanced from 0.2409 to 0.3108, and CDER has been strengthened from 0.8274 to 0.8465 by the IGV strategy at half of gas turbine load and without steam extraction. For the same heating load, both PESR and CDER are enhanced by the IGV strategy. The ability of supplying heating is deteriorating as the decrease in TIT. The ability of shaving peaking power is going to be deteriorated as heating load increases. For the small heating load, like 50 MW, the advantage of the IGV strategy is prominent, the PESR and CDER is advanced 5.81% and 1.48% respectively by the IGV strategy.