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.

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.

Efficiency Improvement in Small Internal Combustion Engine Using Exhaust Heat Recovery System

2018 ◽  
Author(s):  
Shashank Rai ◽  
Selin Arslan ◽  
Badih Jawad
Keyword(s):  
Fuel Economy ◽  
Power Output ◽  
Heat Recovery ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Engine Oil ◽  
Exhaust Heat ◽  
Recovery System ◽  
Heat Recovery System ◽  
Exhaust Heat Recovery

Strict regulations are set up in various parts of the world with respect to vehicular emissions by their respective government bodies forcing automakers to design fuel-efficient vehicles. Fuel economy and carbon emission are the main factors affecting these regulations. In this competitive industry to make fuel efficient vehicles and reduce Green House Gas (GHG) emissions in internal combustions has led to various developments. Exhaust Heat Recovery System (EHRS) plays a vital role in improving powertrain efficiency. In this system, heat rejected by the engine is reused to heat the vehicle fluids faster (like engine coolant, engine oil, etc) also reducing harmful gases emitted. In internal combustion engines, generally only 25% of the fuel energy is converted into useful power output and approximately 40% of it is lost in exhaust heat. Certain studies show that by using the EHRS, the power output can be increased to 40% and the heat loss can be reduced to as much as 25%. The purpose of this study is to make use of this lost energy and convert most of it into useful energy. The thermodynamic properties and fuel consumed during the warmup period were analyzed to measure the improvement in the engine efficiency. The design was implemented on a Briggs and Stratton Junior 206cc engine. This system includes the use of heat exchangers. The main goal of this study is to develop a robust EHRS design and compare it with the baseline engine configuration to see the thermal and fuel economy improvement.

Effects of an Exhaust Heat Recovery System on Performance Characteristics of a Forklift Truck

2019 ◽  
Vol 20 (3) ◽  
pp. 579-588 ◽  
Author(s):  
Man-Woong Heo ◽  
Suk-Jung Bae ◽  
Joo-Yeong Jeong ◽  
Han-Sung Yoo ◽  
Seung-Uk Park ◽  
...  
Keyword(s):  
Heat Recovery ◽  
Performance Characteristics ◽  
Forklift Truck ◽  
Exhaust Heat ◽  
Recovery System ◽  
Heat Recovery System ◽  
Exhaust Heat Recovery
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