scholarly journals Thermal Performance of Alternating-Current Heat Recovery Ventilator in Partially Wet Conditions

Evergreen ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 221-228
Author(s):  
Ahmad Alfan Farizi ◽  
Hyunjin Lee ◽  
Hwataik Han
Keyword(s):  
Thermal Performance ◽  
Heat Recovery ◽  
Alternating Current ◽  
Current Heat

scholarly journals Performance improvement of the heat recovery unit with sequential type heat pipes using TiO2 nanofluid

2019 ◽  
Vol 23 (3 Part B) ◽  
pp. 1755-1764 ◽  
Author(s):  
Ahmet Ozturk ◽  
Mehmet Ozalp ◽  
Adnan Sozen ◽  
Metin Guru
Keyword(s):  
Thermal Performance ◽  
Heat Recovery ◽  
Experimental Studies ◽  
Heat Pipes ◽  
Outer Diameter ◽  
Distilled Water ◽  
Condenser Section ◽  
Recovery System ◽  
Heat Recovery System ◽  
Set Up

This paper deals with the improvement of thermal performance of the heat recovery system in air-to-air unit by using a nanofluid of TiO particles and distilled water. The 2 experimental set-up equipped with 15 copper pipes of a 1000 mm length, 10.5 mm inner diameter, and 12 mm outer diameter was used. The evaporator section consists of 450 mm of heat pipes, the condenser section is 400 mm, and the adiabatic section is 150 mm. In experimental studies, 33% of the evaporator volumes of heat pipes were filled with working fluids. Experiments were carried out at temperatures between 25?C and 90?C by using five different cooling air-flows (40, 42, 45, 61, and 84 g/s), and two different heating powers (3 kW and 6 kW) for the evaporation section, to determine heat removed from the condensation section. Trials were performed for distilled water and nanofluid respectively, and the results were compared with each other. Results revealed that a 50% recovery in the thermal performance of the heat pipe heat recovery system was achieved in the design using TiO nanofluid as the working liquid, at a heating power of 3 kW, air 2 velocity of 2.03 m/s and air-flow of 84 g/s.

The Model Steam Turbine: More Details About the Heat Recovery Steam Generator Evaluating Method in a Combined Cycle Plant

2002 ◽  
Author(s):  
Dietmar Schmidt ◽  
Michail Arnold
Keyword(s):  
Steam Turbine ◽  
Thermal Performance ◽  
Heat Recovery ◽  
Performance Criterion ◽  
Combined Cycle ◽  
Heat Recovery Steam Generator ◽  
Evaluation Of Performance ◽  
Combined Cycle Plant ◽  
Shaft Power ◽  
Evaluating Method

Turnkey and thermal island supply scopes present turbine suppliers with a perfect way to sell their rotating products. The popularity of these plant configurations, along with the recent availability of more holistic test codes, has led to the need for an accurate and reasonable method of determining the thermal performance of the externally-purchased HRSG component. To assess a multiple pressure HRSG, it is advantageous and convenient to have one single criterion for the evaluation of performance, especially when this criterion provides for the compensation of the different outlet energy streams. The so-called Model Steam Turbine method of HRSG evaluation was developed for these reasons. The result of the calculation, a lone performance criterion, is the shaft power of the fictitious Model Steam Turbine.

Study on Energy Saving of the Air-Conditioning Exhaust Heat Recovery System in Office Buildings

2015 ◽  
Vol 775 ◽  
pp. 44-49
Author(s):  
Yan Zou
Keyword(s):  
Thermal Performance ◽  
Heat Recovery ◽  
Sensible Heat ◽  
Humid Climate ◽  
Beijing Area ◽  
Heat Efficiency ◽  
Exhaust Heat ◽  
Recovery System ◽  
Heat Recovery System ◽  
Hot Humid Climate

The study analyzed the thermal performance of a sensible heat recovery system in an office building in Beijing area. Based on proposing the basic evaluation index of the thermal performance, the study analyzed the effect of outdoor temperature and wind speed on the heat recovery efficiency and the reduction of fresh air load. The analysis results show that, the operation effect of the sensible heat recovery device in winter is better. In winter, the sensible heat efficiency η is higher than 60%, the system has higher EER, and the fresh air load can be reduced more than 50%. While the sensible heat efficiency η is lower than 60% in most time in summer. And in a hot, humid climate, the recovery effect of sensible heat recovery device is significantly reduced.

Thermal performance of regenerators and waste heat recovery

1981 ◽  
Vol 24 (11) ◽  
pp. 1793-1800 ◽  
Author(s):  
O.P. Chawla ◽  
A.I. Khandwawala
Keyword(s):  
Thermal Performance ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat

Design, Evaluation, and Testing of a Moderately Concentrating, Nontracking Solar Energy Collector

1981 ◽  
Vol 103 (1) ◽  
pp. 34-41 ◽  
Author(s):  
A. Olvera ◽  
R. B. Bannerot
Keyword(s):  
Solar Energy ◽  
Heat Loss ◽  
Thermal Performance ◽  
Heat Recovery ◽  
Concentration Ratio ◽  
Side Wall ◽  
Recovery Factor ◽  
Design Evaluation ◽  
Optical Efficiency ◽  
Overall Heat Loss Coefficient

The thermal performance of a moderately concentrating, nontracking, trough-like solar energy collector is predicted based on a series of experimental evaluations of its components. Four reflector designs were constructed and tested. Two were one-facet side wall (reflector) designs; two were two-facet designs. Six simple tubular, nonevacuated receiver designs were tested. A collector utilizing one of the reflector designs, geometric concentration ratio of 2.6, and one of the receiver designs was constructed and tested. The predicted performance (an effective overall heat loss coefficient of 4.6 W/m2–°C, an optical efficiency of 0.71 and a heat recovery factor of 0.95) closely approximated the actual thermal performance of the collector. The component evaluations are discussed in such detail that the analysis could easily be extended to other designs by the reader.

Heat Recovery From Bottom Ash in Waste Fired Boilers: Status of Technologies and Thermal Performance Modeling

2013 ◽  
Author(s):  
Kaneesamkandi M. Zakariya
Keyword(s):  
Thermal Performance ◽  
Heat Recovery ◽  
Cooling System ◽  
Bottom Ash ◽  
Heat Content ◽  
Municipal Waste ◽  
Feed Water ◽  
Air Cooling ◽  
Cooling Systems ◽  
Bed Temperature

Bottom ash from Municipal Waste fired boilers have sufficient heat content and this can be used to pre-heat the boiler feed water or the combustion air. A study of the recent developments in this area is done with a focus on the air based cooling method. Modeling and simulation of the thermal performance of an air cooled ash cooling system is done with the help of Gambit/Fluent software. Among several methods of waste disposal, incineration of Municipal Waste is opted mainly due to its energy potential and specific advantages like high volume reduction ratio and convenience in plant location. However, the inherent fuel qualities that confront this method are its high moisture and ash content and the consequent low calorific values. The fuel bed temperature in stoker fired incineration systems can reach up to 1200K and a considerable part of this heat is wasted by way of ash sensible heat loss. The methods used for ash cooling include the water cooled ash screw system, the rolling cylinder ash cooler, fluidized bed ash cooler and the high strength steel belt ash cooler. In this study, the simulation of the performance of water based and air based ash cooling systems is done for a certain municipal waste fired boiler. The effect of the two methods on the overall boiler efficiency is studied. Comparison of results with that of a working system indicates that air cooling systems can be as efficient as the water cooled systems. With the help of this study, bottom ash heat recovery, especially for waste fired boilers, will be appreciated better and power plant designers will have a better insight into this area.

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