scholarly journals Influence of buoyancy forces in multi-storey buildings on the efficiency of a regenerative air handling unit with heat recovery

2021 ◽  
Vol 1032 ◽  
pp. 012029
Author(s):  
A Penev ◽  
L Tsokov
Keyword(s):  
Heat Recovery ◽  
Air Handling Unit ◽  
Buoyancy Forces

Effect of the Heat Recovery System to the Performance of Air Handling Unit of a Shopping Centre

2012 ◽  
Author(s):  
Furkan Kelasovali ◽  
Ali Celen ◽  
Nurullah Kayaci ◽  
Ahmet Selim Dalkilic ◽  
Somchai Wongwises
Keyword(s):  
Heat Exchanger ◽  
Energy Saving ◽  
Heat Recovery ◽  
Cooling Capacity ◽  
Capital City ◽  
Shopping Centre ◽  
Air Handling Unit ◽  
Battery Power ◽  
Recovery System ◽  
Heat Recovery System

In today’s world, the efficient use of energy is very important due to short of energy sources. In order to use energy efficiently, some methods/devices have been developed recently. One of them is heat recovery systems which are used for energy saving in the Heating Ventilating and Air Conditioning applications. Air handling units (AHUs) equipped with heat recovery system can be used applications for energy saving. Not only this paper presents information about rotary heat exchangers which is one of the air to air heat recovery systems but also it investigates their effects to system when they are used in an application. In the study, a shopping centre, which is located in the capital city of Turkey, is taken consideration. The shopping centre has an air handling unit having 54567 m3/h fresh air flow rate, 640 kW heating and 41 kW cooling capacity. Calculations are performed for AHU of the shopping centre both equipped with rotary heat exchanger and without rotary heat exchanger. In order to compare performance of AHUs, annual energy saving, initial investment cost, annual operating expenses, payback time and profit parameters are calculated for each month. According to the results, heating battery power in the heating season and cooling battery power in the cooling season is significantly decreased by using heat recovery system and total annual energy saving is calculated as $83,444. Consequently, it is found that the use of rotary heat exchanger improves performance of system in terms of the reduction in required powers and costs.

Experimental Validation of the Laboratory Air Handling Unit System (LAHU): Part I — Winter Operation

Solar Energy ◽  
2005 ◽  
Author(s):  
Yujie Cui ◽  
Mingsheng Liu ◽  
Kirk Conger
Keyword(s):  
Pump Power ◽  
Heat Recovery ◽  
Energy Use ◽  
Energy Savings ◽  
Energy Performance ◽  
Experimental Methodology ◽  
Air Handling Unit ◽  
Winter Operation ◽  
Air Control ◽  
Validation Experiments

The Laboratory Air Handling Unit (LAHU) system for laboratory buildings has been developed and optimized. Theoretical study has concluded that the LAHU with optimal outside air control and optimal heat recovery control significantly reduces thermal energy use, saves pump power consumption and improves office indoor air quality. This paper presents validation experiments of LAHU energy performance in a large university research building including detailed experimental methodology, procedures and preliminary experimental energy savings results. The experiments establish that the LAHU can reduce annual heating by over 30% and can reduce heat recovery pump power by over 50% for this typical laboratory building.

scholarly journals ANALYSIS OF THE THERMODYNAMICAL EFFICIENCY OF AN AIR HANDLING UNIT WITH A HEAT PUMP / VĖDINIMO ĮRENGINIO SU ŠILUMOS SIURBLIU TERMODINAMINIO EFEKTYVUMO TYRIMAS

2012 ◽  
Vol 5 (4) ◽  
pp. 493-498 ◽  
Author(s):  
Vytautas Martinaitis ◽  
Paulius Bareika ◽  
Violeta Misevičiūtė
Keyword(s):  
Heat Pump ◽  
Heat Recovery ◽  
Thermodynamic Potential ◽  
Energy Analysis ◽  
Ventilation System ◽  
Point Of View ◽  
Thermodynamic Efficiency ◽  
Variable Speed ◽  
Air Handling Unit ◽  
Heat Demand

This paper evaluates the seasonal thermodynamic efficiency of the air-to-air heat pump used for a heat recovery ventilation system and several modulations of compressors affecting the thermodynamic efficiency of the heat pump. A variable speed and on/off-type compressors have been selected. In order to evaluate the thermodynamic potential of the device, energy analysis has been performed. Along with modelling the operation of the air handling unit during the cold time of the year, variations in the thermodynamic efficiency or different modulation compressors have been compared. The obtained results have shown that the use of a few simple compressors causes a decrease in the seasonal parameters of the heat pump: heat generated by a condenser is 5% lower compared to the use of variable speed compressors and therefore the seasonal coefficient of the performance (COP) of the heat pump decreases by 5%. Possible improvement on the heat pump can be provided changing the compressor into variable speed or modulatory equipment, which allows adjusting to heat demand and thus increases the seasonal efficiency of the system from a thermodynamic point of view. Santrauka Straipsnyje vertinamas oras-oras šilumos siurblio, naudojamo vėdinimo sistemos šilumogrąžai, sezoninis termodinaminis naudingumas ir kelios kompresorių, turinčių įtakos termodinaminiam šilumos siurblio naudingumui, moduliacijos. Analizei pasirinkti kintamo greičio ir įjungiamo / išjungiamo tipo kompresoriai. Siekiant įvertinti įrenginio termodinaminį potencialą atliekama ekserginė analizė. Modeliuojant vėdinimo įrenginio veikimą šaltuoju metų laiku, lyginama, kaip kinta skirtingų moduliacijų kompresorių termodinaminis naudingumas. Tyrimo rezultatai rodo, kad naudojant kelis paprastus kompresorius sezoniniai šilumos siurblio parametrai krenta: kondensatoriaus atiduodamas šilumos srautas yra 5 % mažesnis, lyginant su kintamo veikimo kompresorių naudojimu, be to, 5 % sumažėja sezoninis šilumos siurblio efektyvumo koeficientas (COP). Šilumos siurblį galima tobulinti kompresorių keičiant į kintamo greičio arba moduliacinį, kuris leistų prisitaikyti prie šilumos poreikio ir tokiu būdu termodinaminiu požiūriu pagerintų sezoninį sistemos efektyvumą.

Effect of the Heat Recovery System to the Performance of Air Handling Unit of a Workplace

2014 ◽  
Author(s):  
Onur Ali Şenlen ◽  
Ali Celen ◽  
Alican Çebi ◽  
Ahmet Selim Dalkilic ◽  
Somchai Wongwises
Keyword(s):  
Heat Exchanger ◽  
Energy Saving ◽  
Heat Recovery ◽  
Air Handling Unit ◽  
Battery Power ◽  
Payback Time ◽  
Air Handling Units ◽  
Recovery System ◽  
Heat Recovery System ◽  
Rotary Type

This study investigated heat recovery systems and its effects on energy saving. Heat recovery systems are used for energy saving in heating, ventilating and air conditioning applications. In the study, a workplace equipped with and without heat recovery system was taken into consideration. The workplace has an air handling unit (AHU) which has 25,000 m3/h fresh air flow rate, 414 kW heating and 356 kW cooling capacities. AHU uses mixture air including %50 rooms air and mixes in mixing filter section. As a heat recovery system, rotary type heat exchanger was selected and its performance was investigated. Annual energy saving, initial investment cost, annual operating expenses, payback time and profit parameters were calculated to compare two air handling units for each month. According to the results, cooling battery power in the cooling season and heating battery power is reduced with the usage of rotary type heat exchanger. It is obvious that presence of the heat recovery systems enhances performance of the air handling units.

Effects of examine the phase change material through applying the solar collectors: exergy analysis of an air handling unit equipped with the heat recovery unit

2021 ◽  
Vol 41 ◽  
pp. 103002
Author(s):  
Mashhour A. Alazwari ◽  
Nidal H. Abu-Hamdeh ◽  
Ahmed Khoshaim ◽  
Ahmed I. Ashour ◽  
Osama K. Nusier ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Recovery ◽  
Exergy Analysis ◽  
Solar Collectors ◽  
Air Handling Unit ◽  
Recovery Unit ◽  
Change Material

scholarly journals PENGARUH MODIFIKASI AC CHILLER YANG MENGGUNAKAN HEAT RECOVERY TERHADAP PERBANDINGAN COEFFICIENT OF PERFORMANCE (COP)

2020 ◽  
Vol 2 (1) ◽  
pp. 16
Author(s):  
I Wayan Sutarsa ◽  
A.A Krisna Wira Putra ◽  
I Wayan Widiantara
Keyword(s):  
Heat Recovery ◽  
Coefficient Of Performance ◽  
Recovery Coefficient ◽  
Air Handling Unit

AC chiller merupakan salah satu jenis sistem tata udara dengan pendinginan tidak langsung karena sistem pendinginannya tidak mendinginkan udara secara langsung  tetapi melalui media air, yang terlebih dahulu didinginkan oleh sitem refrigerasi. Air yang telah dingin disirkulasikan ke ruangan dengan pompa ke FCU (Fan Coil Unit) atau AHU ( Air Handling Unit). Di dalam sistem refrigerasi, dilakukan modifikasi dengan penambahan komponen Heat recovery, yang dipasang untuk percepat pelepasan panas refrigerant di saluran keluaran Kompresor dan sebelum masuk kondensor pada sistem AC chiller. Penelitian ini membandingkan performansi AC chiller dengan heat recovery dan yang tidak. Pengujian dilakukan sebanyak satu kali pengambilan data. pertama dilakukan pada sistem AC chiller sebelum penambahan komponen heat recovery, yang kedua dilakukan pada sistem AC chiller sesudah penambahan heat recovery. Kedua pengujian ini bertujuan untuk mengetahui perbandingan nilai performansi kerja atau Coefficient Of Performance (COP). Pengujian dilakukan dengan cara pengambilan data secara langsung di sistem terhadap tekanan refrigerant, temperature dan daya listrik.Hasil modifikasi menunjukkan sistem dapat berjalan dengan baik dan hasil pengujian menunjukkan performansi sistem dengan heat recovery hasilnya lebih baik sampai 8, sedangkan yang tidak hanya sampai 6,4. dapat disimpulkan bahwa AC chiller yang ditambahkan dengan komponen heat recovery dapat meningkatkan kinerja dari sistem tersebutKata kunci : AC Chiller, heat recovery, Coefficient Of Performance (COP).

scholarly journals Minimization of the Lifecycle Cost of a Rotary Heat Exchanger Used in Building Ventilation Systems in Cold Climates

2021 ◽  
Vol 67 (6) ◽  
pp. 302-310
Author(s):  
Ignas Sokolnikas ◽  
Kęstutis Čiuprinskas ◽  
Jolanta Čiuprinskienė
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Heat Recovery ◽  
Foil Thickness ◽  
Geometrical Parameters ◽  
Cold Climates ◽  
Heat Transfer Efficiency ◽  
Air Handling Unit ◽  
Building Ventilation ◽  
Ventilation Systems

This article presents an analysis of rotary heat exchangers (RHE) used as heat recovery units in building ventilation systems in cold climates. Usually, heat exchangers with the highest heat transfer efficiency are the preferable option for this purpose. However, such exchangers usually have the highest media pressure drop, thus requiring the highest amount of energy for media transportation. In this study, the problem is solved by analysing the lifecycle cost (LCC) of the RHE including both the recovered heat and the electricity consumed in the fans of the air handling unit (AHU). The purpose of the investigation was to determine the optimal set of geometrical characteristics such as the exchanger’s length, foil thickness, the height and width of the air channel. Two hundred and seventy different combinations were examined using analytical dependencies and ANSYS simulations. The results are compared with experimental data obtained earlier at the KOMFOVENT laboratory. The results show that the best overall energy efficiency is obtained in heat exchangers that do not offer the best heat recovery efficiency, and LCC differences in the same climatic and economic conditions can go as high as 31 %, mainly due to the geometrical parameters of the heat exchanger.

LAHU Heat Recovery System Optimal Operation and Control Schedules

2005 ◽  
Vol 128 (3) ◽  
pp. 360-366 ◽  
Author(s):  
Yujie Cui ◽  
Mingsheng Liu
Keyword(s):  
Thermal Energy ◽  
Heat Recovery ◽  
Energy Savings ◽  
Pump Energy ◽  
Weather Conditions ◽  
Optimal Operation ◽  
Air Handling Unit ◽  
Recovery System ◽  
Heat Recovery System ◽  
And Control

Optimal operation and control of heat recovery in an integrated Laboratory Air Handling Unit (LAHU) system differs substantially from that in conventional dedicated AHUs for laboratory buildings with a 100% outside air AHU for laboratory spaces, since the LAHU allows economizer operation for both offices and laboratories. Optimal operation and control schedules of the heat recovery systems in the LAHU have been developed to minimize the total thermal energy cost. This paper presents the procedure, methodology, and results of generic optimal heat recovery control schedules for the LAHU and investigates its impact on the LAHU potential thermal and pump energy savings. The optimal control schedule can potentially save 14% to 27% thermal energy and 17% to 100% pump energy during the winter under weather conditions that prevail in Omaha, Nebraska. The findings discussed in this paper also apply to any heat recovery system, where AHU has an economizer function.

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