Utilization of Indirect Adiabatic Cooling in Heat Recovery Device

2013 ◽  
Vol 649 ◽  
pp. 307-310
Author(s):  
Ondřej Nehasil ◽  
Daniel Adamovský
Keyword(s):  
Heat Exchanger ◽  
Heat Load ◽  
Air Conditioning ◽  
Heat Recovery ◽  
Energy Savings ◽  
Economic Benefits ◽  
Calculation Procedure ◽  
Energy Demands ◽  
Adiabatic Cooling

Decreasing heat load of buildings and their cooling is a major problem affecting the quality of both inner environment and air-conditioning system's energy demands. One of the alternatives using regular components of a standard air-conditioning unit is indirect adiabatic cooling. By means of a customized calculation procedure, this article demonstrates performance possibilities, energy savings and the economic benefits of indirect adiabatic cooling connected with a heat recovery heat exchanger on two air-conditioning unit alternatives.

Analysis of Heat Pipe Heat Exchanger (HPHE) For Waste Heat Recovery from an Air Conditioning System

2007 ◽  
Vol 2 (3) ◽  
pp. 86-95
Author(s):  
R. Sudhakaran ◽  
◽  
V. Sella Durai ◽  
T. Kannan ◽  
P.S. Sivasakthievel ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Heat Pipe ◽  
Air Conditioning ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Air Conditioning System ◽  
Pipe Heat

Design of a heat recovery unit using exhaust gases for energy savings in an absorption air conditioning unit

2021 ◽  
pp. 117031
Author(s):  
Mostafa El-Shafie ◽  
M. Khalil Bassiouny ◽  
Shinji Kambara ◽  
Samy M. El-Behery ◽  
A.A. Hussien
Keyword(s):  
Air Conditioning ◽  
Heat Recovery ◽  
Energy Savings ◽  
Exhaust Gases ◽  
Recovery Unit

scholarly journals Design of an adiabatic air conditioning package system

2022 ◽  
Vol 13 ◽  
pp. 8
Author(s):  
Sachin Sunil Mothiravally ◽  
Sachidananda Hassan Krishanmurthy
Keyword(s):  
Thermal Analysis ◽  
Energy Consumption ◽  
Return On Investment ◽  
Air Conditioning ◽  
Energy Savings ◽  
Coefficient Of Performance ◽  
Cooling Systems ◽  
Air Conditioning System ◽  
Adiabatic Cooling ◽  
Save Energy

Air conditioning plays a significant role to maintain a cool atmosphere in warm conditions, However, the power consumed by the machine is higher. The commercial prevailing cooling systems are required to operate ventilation and cooling systems in buildings and in turn consumes more power. These systems apart from consuming electricity it also adds to the CO2 emissions to our environment. These energy consumption and CO2 emissions can be decreased by the assistance of energy effective frameworks to the prevailing air conditioning system. The study was conducted on a package unit of 414.2 kW by measuring the relative humidity, dry bulb, and wet bulb temperature to investigate the effect of indirect evaporative cooling on the systems COP. Also, the modelling of the package unit was done using Creo software and the analysis was carried out using ANSYS considering the flow and thermal analysis for different components of the package units. From this analysis it can be observed that by implementing the adiabatic cooling in package unit it is possible to save energy consumption. From the results it can be concluded that energy efficiency was more and the return on investment is high. Also, coefficient of performance of this machine is high and consumes less electricity and the expected energy savings is 20%.

Thermoeconomic Indicators of Air Conditioning in a River Ship to Change the Configuration of Their Thermal Insulation

2014 ◽  
Author(s):  
J. Fajardo ◽  
B. Sarria ◽  
M. Alvarez Guerra
Keyword(s):  
System Performance ◽  
Heat Load ◽  
Air Conditioning ◽  
Second Law Of Thermodynamics ◽  
Second Law ◽  
Cooling Load ◽  
Air Conditioning System ◽  
Object Of Study ◽  
The Cost

This work has as object of study the energy of a river ship air conditioning system performance, using fiberglass, polyurethane or rockwool as insulation. Thermoeconomics Indicators based on second law of thermodynamics which take into account the quality of the energy and the cost of the exergy were used for research. It was observed that: (i) by increasing the thickness of the insulation the irreversibilities decreased, (ii) increases in the destroyed exergy increased generation of cooling load costs and (iii) costs per unit of exergy of heat load and area for the generation of cooling load and for investment in exergetic insulation, were minors for polyurethane.

Airtightness of Buildings in Slovakia

2013 ◽  
Vol 649 ◽  
pp. 3-6 ◽  
Author(s):  
Dušan Katunský ◽  
Maros Nemec ◽  
Martin Kamenský
Keyword(s):  
Energy Savings ◽  
Slovak Republic ◽  
Point Of View ◽  
Building Envelopes ◽  
Energy Demands ◽  
Energy Economy ◽  
Materials Used ◽  
Selection Of ◽  
Made In

The actual trend of civil engineering leads to quality improving of housing and to saving of all participated energies. Airtightness of buildings´ envelope constructions has an important job in the point of view of energy savings and energy economy. Undesirable air flow occurs through joints, cracks and leaks in building envelopes. It has a significant influence to final quality of an indoor environment and energy demands and needs of warmth for heating resulting from it. The paper presents results of chosen airtightness measurements made in family and apartment buildings in the Slovak Republic, the achieved level of airtightness by various construction systems and outer walls, as well as which impact for air changes has location and selection of materials used for airtightness layer in the construction of outer walls at pressure difference of 50 Pa (n50).

Optimization of Advanced Cycle Gas Turbine Intercooler Structure Based on Genetic Algorithm

2011 ◽  
Vol 317-319 ◽  
pp. 2041-2046
Author(s):  
Zhi Tao Wang ◽  
Shu Ying Li ◽  
Ping Ping Luo
Keyword(s):  
Heat Transfer ◽  
Genetic Algorithm ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Gas Turbine ◽  
Thermal Efficiency ◽  
Heat Load ◽  
Structure Parameters ◽  
Heat Transfer Efficiency

As an important component of intercooled cycle gas turbine, intercooler directly affects the ratio power, thermal efficiency and various situation quality of gas turbine system. In this paper, efficiency-heat transfer units were used for the design of intercooler, and the structure parameters were optimized by genetic algorithm. The optimization results show that under the condition of required heat load and allowable pressure drop, the heat exchanger can be guaranteed as the smaller weight and the larger heat transfer efficiency, which can offer reference for the design of the actual intercooler.

scholarly journals Annual Energy Performance of an Air Handling Unit with a Cross-Flow Heat Exchanger

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1519
Author(s):  
Piotr Michalak
Keyword(s):  
Heat Exchanger ◽  
Heat Recovery ◽  
Energy Savings ◽  
Cross Flow ◽  
Energy Performance ◽  
Net Energy ◽  
Heating And Cooling ◽  
Air Handling Unit ◽  
Temperature Efficiency ◽  
Flow Heat

Heat recovery from ventilation air is proven technology resulting in significant energy savings in modern buildings. The article presents an energy analysis of an air handling unit with a cross-flow heat exchanger in an office building in Poland. Measurements were taken during one year of operation, from 1 August 15 to 31 July 16, covering both heating and cooling periods. Calculated annual temperature efficiency of heat and cold recovery amounted to 65.2% and 64.6%, respectively, compared to the value of 59.5% quoted by the manufacturer. Monthly efficiency of heat recovery was from 37.6% in August to 68.7% in November, with 63.9% on average compared to 59.5% declared by the manufacturer. Cold recovery was from 63.3% in April to 72.8% in September, with 68.1% annually. Calculated recovered heat and cold amounted 25.6 MWh and 0.26 MWh, respectively. Net energy savings varied from −0.46 kWh/m2 in August, when consumption by fans exceeded savings, to 5.60 kWh/m2 in January.

scholarly journals Multi-stage heat-pipe heat exchanger for improving energy efficiency of the HVAC system in a hospital operating room 1

2020 ◽  
Author(s):  
Ragil Sukarno ◽  
Nandy Putra ◽  
Imansyah Ibnu Hakim ◽  
Fadhil Fuad Rachman ◽  
Teuku Meurah Indra Mahlia
Keyword(s):  
Heat Exchanger ◽  
Air Conditioning ◽  
Energy Recovery ◽  
Heat Recovery ◽  
Heat Pipes ◽  
Inlet Temperature ◽  
Hvac System ◽  
Inlet Velocity ◽  
Air Inlet ◽  
Pipe Heat

Abstract The demands of specific requirements related to thermal comforts, such as temperature, relative humidity, inside air exchange and other factors required in a hospital operating rooms, have necessitated the development of energy-efficient heating, ventilation and air conditioning (HVAC) systems and efficient heat-recovery system using a heat-pipe heat exchanger (HPHE). The experiment was conducted by using HPHEs having three, six and nine rows, with four heat pipes in each row, arranged in a staggered configuration with a variation of fresh-air inlet temperature and velocity. The theoretical analysis was conducted using the ε-NTU method for predicting the effectiveness, outlet temperature of the evaporator side and energy recovery of the HPHE. The experimental results indicated that increasing the air-inlet temperature in the evaporator section and the number of rows increased the HPHE effectiveness but increasing the air-inlet velocity reduced the effectiveness. The highest effectiveness of 62.6% was obtained at an air-inlet temperature of 45°C with an air-inlet velocity of 2 m/s and a 9-row HPHE. The energy recovery of the HPHE increased with the number of rows, air-inlet temperature and air velocity in the evaporator section. The ε-NTU method can be used as a comparison method in the analysis of heat-recovery systems that apply HPHE air conditioning systems. Heat pipes that utilize cold-air exhaust from a room in an HVAC system can enhance efficiency and reduce emissions.

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