A CASE STUDY ON ENERGY SAVINGS IN AIR CONDITIONING SYSTEM BY HEAT RECOVERY USING HEAT PIPE HEAT EXCHANGER (original) (raw)
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Proceedings of the 2nd International Conference on Science, Technology, and Modern Society (ICSTMS 2020), 2021
Population and economic growth affect the total energy demand and Air Conditioner (AC) electrical systems and economic growth. Energy conservation is needed to reduce the total energy used. Heat pipe heat exchangers (HPHE) are implemented to recover waste energy in air conditioning systems. This study has investigated the performance relationship between effectiveness and the Number of Transfer Units (NTU) in the system. One line of straight axis heat pipe is installed at the inlet and outlet. The configuration was shaky. Changes in temperature and humidity are measured to obtain energy conversion according to changes in air intake speed and temperature variations that enter the ducting. The application of HPHE in the air conditioning system can reduce energy consumption. The results showed that the relationship between effectiveness and NTU was linear. The effectiveness varies from 0.08 to 0.202, and the relationship is expressed as = 1.14NTU + 0.0041. Whereas for low temperature applications the effectiveness varies from 0.022-0.14, the relationship is expressed as = 1 765 NTU + 2.9. These test results can be concluded that HPHE is economical for heat recovery systems in air conditioning systems.
Experimental Study of Heat Pipe Heat Exchanger in Hospital HVAC System for Energy Conservation
International Journal on Advanced Science, Engineering and Information Technology, 2017
The hospitals Heating, Ventilation, and Air Conditioning (HVAC) systems consumed large amounts of energy due to the specific requirements that must be met to ensure that environmental conditions were healthy, convenient, and safe. Therefore, to reduce electricity consumption without sacrificing comfort and improving indoor air quality, the utilizing of heat pipe heat exchanger (HPHE) is necessary and highly recommended. An experimental study was conducted to investigate the thermal performance of heat pipe in recovering the heat of an exhaust air from a room simulator. HPHE consisted of several tubular heat pipes with water as a working fluid and staggered by up to six rows. The outer diameter of each heat pipe was 13 mm and length of 700 mm with fins mounted on each heat pipe. A series of experiments was conducted to determine the effect of inlet air temperature. The influence of the number of heat pipe rows and air velocity was also investigated. The experiments showed that the higher inlet air temperature, the more effective the HPHE performance became. The cooling capacity of the system had increased. It was indicated by the decrease of air temperature entering the evaporator by 2.4 °C with the effectiveness of 0.15. This result was achieved when using six rows HPHE, air velocity 1 m/s, and evaporator inlet air temperature 45 °C. When air velocity was doubled to 2 m/s, the system reached the largest amount of heat recovered of 1404.29 kJ/hour. The overall use of energy in HVAC system from the annual prediction of heat recovery for 8 h/day and 365 days/year would decrease significantly 0.6-4.1 GJ/yr.
Heat pipe heat exchanger for heat recovery in air conditioning
Applied Thermal Engineering, 2007
The heat pipe heat exchangers are used in heat recovery applications to cool the incoming fresh air in air conditioning applications. Two streams of fresh and return air have been connected with heat pipe heat exchanger to investigate the thermal performance and effectiveness of heat recovery system. Ratios of mass flow rate between return and fresh air of 1, 1.5 and 2.3 have been adapted to validate the heat transfer and the temperature change of fresh air. Fresh air inlet temperature of 32-40°C has been controlled, while the inlet return air temperature is kept constant at about 26°C. The results showed that the temperature changes of fresh and return air are increased with the increase of inlet temperature of fresh air. The effectiveness and heat transfer for both evaporator and condenser sections are also increased to about 48%, when the inlet fresh air temperature is increased to 40°C. The effect of mass flow rate ratio on effectiveness is positive for evaporator side and negative for condenser side. The enthalpy ratio between the heat recovery and conventional air mixing is increased to about 85% with increasing fresh air inlet temperature. The optimum effectiveness of heat pipe heat exchanger is estimated and compared with the present experimental data. The results showed that the effectiveness is close to the optimum effectiveness at fresh air inlet temperature near the fluid operating temperature of heat pipes.
A Review on Heat Pipe for Air Conditioning applications
International Journal of Current Engineering and Technology
Heat pipe are popular in applications such as air conditioning, space technology, electronics, cooking etc. A literature review on heat pipe for air conditioning applications is conducted in the present paper. This paper focuses on the dehumidification enhancement and sensible heat recovery aspects of heat pipe heat exchanger for an air conditioning application. Based on this study, the application of a heat pipe heat exchanger in the conventional air conditioning systems is recommended as an efficient means for energy savings and dehumidification enhancement to maintain acceptable room conditions. This paper gives the idea about various parameters and methods that used for dehumidification enhancement and heat recovery application. This review concludes that, the use of heat pipe heat exchanger for heat recovery and dehumidification enhancement application makes significant changes in indoor air quality and energy consumption. So the use of HPHX is strongly recommended for Air Conditioning applications.
Waste heat energy utilization in refrigeration and air-conditioning
IOP Conference Series: Materials Science and Engineering, 2018
This paper represents the utilization of wastage of heat energy from Refrigeration and airconditioning , thereby saving energy. Generally in refrigeration system waste heat available at condenser unit, so we have used that available waste heat for heating of water. For making this system multifunctional, flexible and economical Condensing coil is immersed in water to be heated and a part of cooling coil 1 st passed through filled water tank in which water is to be cooled and then remaining coil is utilized for cooling of air so that desired space to be cooled. Hence here cooling of air, water and heating of water all the three process is done simultaneously in a single unit. For this an experimental setup is designed and fabricated in the hydraulic machine lab of BIT sindri, Dhanbad and various measuring parameter were recorded through different instruments. The COP of system, Capacity of water heater and cooling capacity of room air cooler here calculated is 4.03, 1.51, 3.0034 TR respectively, which is within permissible range.
E3S Web of Conferences
Heating, Ventilation, and Air Conditioning (HVAC) system in hospital's clean room is required to continue working for 24 hours to provide the ideal air quality for the activities therein. This causes a huge amount of energy consumption in hospital buildings itself. This study aims to determine the effectiveness and heat recovery of Heat Pipe Heat Exchanger (HPHE). The HPHE used in this study consisted of 12 heat pipes per module, in which the line was arranged staggered. The number of the module is varied 3 times, which are 1, 2, and 3 modules. The heat pipe is made of copper and contains working fluid in the form of water with 50% filling ratio. HPHE equipped with fins to expand the contact surface with airflow. Each variation of the number of modules is tested on the HVAC system model of the clean room. In the evaporator inlet, air flowing to the variation of temperature: 28, 30, 35, and 40°C, and at speeds of 1.5, 2.0, 2.5 m/s. The use of HPHE can recover heat as much as 1654...
Heat Pipe Heat Exchangers and Hvac System – a Review
International Journal Of Trendy Research In Engineering And Technology
Heat pipes are getting more popular as passively heat transmission technology, due to their excellent efficiency. It is popular in applications such as air conditioning, aviation, space technology, electronics etc. The performance, components, and applications of the most current heat pipe devices are completely analysed in this paper. The entire study objective was to improve people's understanding of heat pipes by gathering and organizing data that was easily and quickly available in a variety of forms across the material spectrum, displaying it in an ordered manner that went from basic to advanced knowledge about heat pipes, and contributing additional insight into the proficiency of considerations made during the design and fabrication of heat pipes as well as investigating how a change in heat pipe parameters affects performance. The study on heat pipes that has been done in terms of design and analysis is covered in this paper.
International Journal of Technology, 2019
Hospitals consume large amounts of energy, especially in their heating, ventilation, and air conditioning (HVAC) systems due to the special requirements for ensuring healthy, comfortable, and safe environmental conditions. The use of a Heat Pipe Heat Exchanger (HPHE) is recommended as a means of minimizing electricity consumption with no loss of comfort while also improving indoor air quality. An experimental study was conducted to investigate the performance of a U-shape HPHE in recovering exhaust air heat from an indoor room included in an HVAC system. The U-shape HPHE consists of several tubular U-shape heat pipes with water as a working fluid and arranged in a staggered configuration. Tests were carried out to determine the impact of the inlet air temperature, air velocity, and the number of heat pipes on its effectiveness. The experiment revealed that the higher the temperature of the inlet air, the more effective the U-shape HPHE. The results show that the temperature of the air entering the cooling coil decreased by 1.73 °C with an effectiveness value of 7.64 %. This result was achieved using 12 U-shape HPHEs, which had a staggered arrangement, an air velocity of 1.5 m / s, and an air temperature entering the evaporator of 45 °C. The highest amount of heat recovery, 2190.43 kJ/hour, was achieved when the air velocity was 2.5 m/s.
International Journal of Low-Carbon Technologies, 2014
Heat pipe heat exchangers could be employed as run-around coils in air conditioning systems for enhanced dehumidification and cooling. This article reviews some of the works conducted on the cooling and dehumidification aspects in various air conditioning systems. They have been proved to be effective in enhancing dehumidification and reducing air conditioning costs especially in hot and humid tropical countries.