Pub Date : 2020-10-08DOI: 10.37591/JORACHV.V7I2.834
D. K. Joshi
The objective of this paper is to describe a newly-developed hybrid refrigeration system .This hybrid refrigeration system , combination of a vapor compression refrigeration system driven by the high grade electrical energy and heat driven an absorption refrigeration system .Absorption system activated by waste heat available from the condenser of vapour compression system to produce the required necessary temperature in generator to vaporize refrigerant. However an electrical heater in the generator is provided to give additional heat, to increases the temperature and pressure of refrigerant vapours. An absorption-compression hybrid refrigeration system is studied, and it can recover maximum condensation heat for the generation of refrigerant vapours.
{"title":"Waste Heat Driven Hybrid Refrigeration System: A Review","authors":"D. K. Joshi","doi":"10.37591/JORACHV.V7I2.834","DOIUrl":"https://doi.org/10.37591/JORACHV.V7I2.834","url":null,"abstract":"The objective of this paper is to describe a newly-developed hybrid refrigeration system .This hybrid refrigeration system , combination of a vapor compression refrigeration system driven by the high grade electrical energy and heat driven an absorption refrigeration system .Absorption system activated by waste heat available from the condenser of vapour compression system to produce the required necessary temperature in generator to vaporize refrigerant. However an electrical heater in the generator is provided to give additional heat, to increases the temperature and pressure of refrigerant vapours. An absorption-compression hybrid refrigeration system is studied, and it can recover maximum condensation heat for the generation of refrigerant vapours.","PeriodicalId":91841,"journal":{"name":"ASHRAE winter conference papers. American Society of Heating, Refrigeration and Air-Conditioning Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73985924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-08DOI: 10.37591/jorachv.v7i2.940
C. Armenta-Déu
This paper presents a new air conditioning system using an external air chamber enclosure. The system is based on evaporative refrigeration technique humidifying hot air from the environment by means of a new design humidifier. Temperature at the air chamber is set up according to the required comfort conditions. The air chamber plays the role of a heat collector from indoor room radiative energy. This new system avoids thermal gradient inside the room improving the comfort because of a more homogeneous temperature distribution. Maximum thermal amplitude at the air chamber and indoor room is of 2°C. Theoretical analysis has been developed to determine the refrigeration energy consumption matching values with literature data. Experimental tests have shown a good correlation with theoretical prediction, within accuracy of 7.8%, close to the 8.2 % uncertainty of experimental measurements. A significant reduction in energy consumption has been achieved with COP values up to 4.8 for 31.5°C of ambient temperature. COP increases linearly with ambient temperature and enhances efficiency of air conditioning compression units above 31.5°C, although shows poorer performance below 29°C, what makes the new system especially suitable for hot climates. The result of the evaporative refrigeration at the air chamber has permitted the reduction of daily thermal amplitude from 17°C at the outside, to only 2°C, at the inside. COP of the new system moves from 1.1 to 4.8 within ambient temperature limits, 25.5°C to 31.5°C. Maximum amplitude of temperature at the indoor room has been of 2°C, with a maximum thermal gradient that has not exceeded 0.5°C/m.
{"title":"Indoor Room Air Conditioning Using External Enclosure","authors":"C. Armenta-Déu","doi":"10.37591/jorachv.v7i2.940","DOIUrl":"https://doi.org/10.37591/jorachv.v7i2.940","url":null,"abstract":"This paper presents a new air conditioning system using an external air chamber enclosure. The system is based on evaporative refrigeration technique humidifying hot air from the environment by means of a new design humidifier. Temperature at the air chamber is set up according to the required comfort conditions. The air chamber plays the role of a heat collector from indoor room radiative energy. This new system avoids thermal gradient inside the room improving the comfort because of a more homogeneous temperature distribution. Maximum thermal amplitude at the air chamber and indoor room is of 2°C. Theoretical analysis has been developed to determine the refrigeration energy consumption matching values with literature data. Experimental tests have shown a good correlation with theoretical prediction, within accuracy of 7.8%, close to the 8.2 % uncertainty of experimental measurements. A significant reduction in energy consumption has been achieved with COP values up to 4.8 for 31.5°C of ambient temperature. COP increases linearly with ambient temperature and enhances efficiency of air conditioning compression units above 31.5°C, although shows poorer performance below 29°C, what makes the new system especially suitable for hot climates. The result of the evaporative refrigeration at the air chamber has permitted the reduction of daily thermal amplitude from 17°C at the outside, to only 2°C, at the inside. COP of the new system moves from 1.1 to 4.8 within ambient temperature limits, 25.5°C to 31.5°C. Maximum amplitude of temperature at the indoor room has been of 2°C, with a maximum thermal gradient that has not exceeded 0.5°C/m.","PeriodicalId":91841,"journal":{"name":"ASHRAE winter conference papers. American Society of Heating, Refrigeration and Air-Conditioning Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90380026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-17DOI: 10.37591/JORACHV.V7I1.873
B. Arthy, T. Kumaresan, C. M. Mithiran, S. Dharaneeswaran, V. Thivakar, P. Balamurugan
The Solar Thermal Cooling System mainly comprises of Solar Panels, Generator, Condenser and Evaporator. In addition an ejector is mounted in the existing system to improve the performance of the system. The Ejector is having a primary and secondary inlet nozzle. In the primary flow nozzle the motive refrigerant will flow with high pressure which comes from generator. The area of the ejector is reduced to increase the pressure by means of venturi effect. Due to high velocity of motive refrigerant, the negative pressure is created inside the suction chamber which in turn sucks the low pressure refrigerant from the evaporator. The mixture of high pressure motive refrigerant and the low pressure refrigerant passes into the condenser at moderate pressure and the cyclic process is continued. The main scope of the project is to fabricate only the ״ejector״.
{"title":"Design, Fabrication and Testing of Ejector for Solar Thermal Cooling System","authors":"B. Arthy, T. Kumaresan, C. M. Mithiran, S. Dharaneeswaran, V. Thivakar, P. Balamurugan","doi":"10.37591/JORACHV.V7I1.873","DOIUrl":"https://doi.org/10.37591/JORACHV.V7I1.873","url":null,"abstract":"The Solar Thermal Cooling System mainly comprises of Solar Panels, Generator, Condenser and Evaporator. In addition an ejector is mounted in the existing system to improve the performance of the system. The Ejector is having a primary and secondary inlet nozzle. In the primary flow nozzle the motive refrigerant will flow with high pressure which comes from generator. The area of the ejector is reduced to increase the pressure by means of venturi effect. Due to high velocity of motive refrigerant, the negative pressure is created inside the suction chamber which in turn sucks the low pressure refrigerant from the evaporator. The mixture of high pressure motive refrigerant and the low pressure refrigerant passes into the condenser at moderate pressure and the cyclic process is continued. The main scope of the project is to fabricate only the ״ejector״.","PeriodicalId":91841,"journal":{"name":"ASHRAE winter conference papers. American Society of Heating, Refrigeration and Air-Conditioning Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73054811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.37591/JORACHV.V7I3.1016
C. Armenta-Déu
The paper describes the characteristics of a novel hybrid system of air conditioning and PV panel used to remove heat from PV panels located on the building roof and to air conditioning the space of the building placed just below. The design of the system is based on the well- known Trombe wall principle with the special characteristic of using a PV panel as front surface “to collect” heat that is transferred to the air chamber. A theoretical simulation has been developed to predict thermal behavior and temperatures of the air chamber and indoor room showing an excellent agreement to experimental results, within a 96.5% accuracy. Carried out tests have proved that forced convection at the air chamber can remove the energy excess at the PV panel, which can be used to increase temperature at the indoor room fulfilling comfort conditions. Top to bottom thermal gradient inside the indoor room is reduced from 5o C to 1o C when using forced convection at the air chamber which improves comfort conditions and maintains temperature within the comfort setup range.
{"title":"Indoor Room Air Conditioning Using Heat Removal from PV Panels","authors":"C. Armenta-Déu","doi":"10.37591/JORACHV.V7I3.1016","DOIUrl":"https://doi.org/10.37591/JORACHV.V7I3.1016","url":null,"abstract":"The paper describes the characteristics of a novel hybrid system of air conditioning and PV panel used to remove heat from PV panels located on the building roof and to air conditioning the space of the building placed just below. The design of the system is based on the well- known Trombe wall principle with the special characteristic of using a PV panel as front surface “to collect” heat that is transferred to the air chamber. A theoretical simulation has been developed to predict thermal behavior and temperatures of the air chamber and indoor room showing an excellent agreement to experimental results, within a 96.5% accuracy. Carried out tests have proved that forced convection at the air chamber can remove the energy excess at the PV panel, which can be used to increase temperature at the indoor room fulfilling comfort conditions. Top to bottom thermal gradient inside the indoor room is reduced from 5o C to 1o C when using forced convection at the air chamber which improves comfort conditions and maintains temperature within the comfort setup range.","PeriodicalId":91841,"journal":{"name":"ASHRAE winter conference papers. American Society of Heating, Refrigeration and Air-Conditioning Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87208015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-29DOI: 10.17586/2310-1148-2017-10-2/3-26-34
S. Rusakov
{"title":"The choice of the scheme of air distribution from ventilation and air-conditioning systems in the hall of the small indoor ice rink","authors":"S. Rusakov","doi":"10.17586/2310-1148-2017-10-2/3-26-34","DOIUrl":"https://doi.org/10.17586/2310-1148-2017-10-2/3-26-34","url":null,"abstract":"","PeriodicalId":91841,"journal":{"name":"ASHRAE winter conference papers. American Society of Heating, Refrigeration and Air-Conditioning Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74881062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-29DOI: 10.17586/2310-1148-2017-10-2/3-18-25
V. I. Lysev, A. S. Shilin
{"title":"The ways to increase energy efficiency of buildings and structures","authors":"V. I. Lysev, A. S. Shilin","doi":"10.17586/2310-1148-2017-10-2/3-18-25","DOIUrl":"https://doi.org/10.17586/2310-1148-2017-10-2/3-18-25","url":null,"abstract":"","PeriodicalId":91841,"journal":{"name":"ASHRAE winter conference papers. American Society of Heating, Refrigeration and Air-Conditioning Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81474797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-29DOI: 10.17586/2310-1148-2017-10-2/3-3-11
V. I. Lysev, T. A. Parizhskaya
Климатические параметры наружного воздуха всегда изменчивы, как в течение астрономического года, так и в долгосрочной перспективе, что приводит к неопределенности возможных затрат на сооружение систем обеспечения микроклимата. Многообразие объектов и их исходных условий предопределяет множество возможных вариантов технических решений, а противоречивость определяющих показателей и отсутствие рекомендации о способе выполнения количественной оценки влияния выбранных НРП на степень обеспеченности, а также связанных с этим обстоятельством расчетных величин необходимого потребления теплоты на нагрев воздуха в холодный период и холода для снижения температуры наружного воздуха в теплый период года, значительно осложняет выбор. В основе выбора рационального варианта технического решения системы обеспечения микроклимата лежит целенаправленное рассмотрение исходных условий объекта с последующим анализом функциональных показателей возможных (альтернативных) технических решений систем. В связи с зависимостью количества требуемых ресурсов не только от принципиального решения систем, но и от режимов функционирования, предложено оценивать функциональные показатели системы по значениям сезонных коэффициентов обеспеченности, а так же по удельным затратам энергоресурсов. Данный подход пояснен на примере конкретных объектов. Ключевые слова: система обеспечения микроклимата, исходные условия, варианты технических решений, расход наружного приточного воздуха, нагрев и охлаждение воздуха, удельный расход теплоты и холода, расчетные параметры наружного воздуха, коэффициенты обеспеченности.
{"title":"The effect of the initial conditions on the functional indicators of microclimate maintenance systems","authors":"V. I. Lysev, T. A. Parizhskaya","doi":"10.17586/2310-1148-2017-10-2/3-3-11","DOIUrl":"https://doi.org/10.17586/2310-1148-2017-10-2/3-3-11","url":null,"abstract":"Климатические параметры наружного воздуха всегда изменчивы, как в течение астрономического года, так и в долгосрочной перспективе, что приводит к неопределенности возможных затрат на сооружение систем обеспечения микроклимата. Многообразие объектов и их исходных условий предопределяет множество возможных вариантов технических решений, а противоречивость определяющих показателей и отсутствие рекомендации о способе выполнения количественной оценки влияния выбранных НРП на степень обеспеченности, а также связанных с этим обстоятельством расчетных величин необходимого потребления теплоты на нагрев воздуха в холодный период и холода для снижения температуры наружного воздуха в теплый период года, значительно осложняет выбор. В основе выбора рационального варианта технического решения системы обеспечения микроклимата лежит целенаправленное рассмотрение исходных условий объекта с последующим анализом функциональных показателей возможных (альтернативных) технических решений систем. В связи с зависимостью количества требуемых ресурсов не только от принципиального решения систем, но и от режимов функционирования, предложено оценивать функциональные показатели системы по значениям сезонных коэффициентов обеспеченности, а так же по удельным затратам энергоресурсов. Данный подход пояснен на примере конкретных объектов. Ключевые слова: система обеспечения микроклимата, исходные условия, варианты технических решений, расход наружного приточного воздуха, нагрев и охлаждение воздуха, удельный расход теплоты и холода, расчетные параметры наружного воздуха, коэффициенты обеспеченности.","PeriodicalId":91841,"journal":{"name":"ASHRAE winter conference papers. American Society of Heating, Refrigeration and Air-Conditioning Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74510827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-29DOI: 10.17586/2310-1148-2017-10-2/3-12-17
A. Malyshev, K. Kisser, Kouadio Koffi Fabrice
В статье представлен обзор научных исследований теплогидродинамических характеристик при кипении рабочих веществ в мини(микро) каналах. Определены преимущества миниканальных теплообменников с позиции энергоэффективности, надежности, массогабаритных характеристик. Рассмотрены методики проведения теплофизических экспериментов в мини(микро) каналах с разными гидравлическими диаметрами и рабочими веществами, такими как R134a, R410A, водо-воздушные смеси и вода. В статье представлены схемы экспериментальных стендов как с мини-, так и с микроканалами для исследования режимов кипения, а также определения коэффициентов теплоотдачи. Показана целесообразность продолжения исследования теплообмена и гидродинамики в миниканалах, основываясь на комплексном подходе, включающем исследования режимов кипения, истинного паросодержания, локального теплообмена и перепадов давления. Представлена схема экспериментального стенда. Ключевые слова: хладоносители; теплогидродинамические характеристики; кипение хладагентов; миниканальный теплообменник; экспериментальный стенд.
{"title":"Complex pilot studies of heathydrodynamic processes of the boiling coolants in mini-(micro) channels","authors":"A. Malyshev, K. Kisser, Kouadio Koffi Fabrice","doi":"10.17586/2310-1148-2017-10-2/3-12-17","DOIUrl":"https://doi.org/10.17586/2310-1148-2017-10-2/3-12-17","url":null,"abstract":"В статье представлен обзор научных исследований теплогидродинамических характеристик при кипении рабочих веществ в мини(микро) каналах. Определены преимущества миниканальных теплообменников с позиции энергоэффективности, надежности, массогабаритных характеристик. Рассмотрены методики проведения теплофизических экспериментов в мини(микро) каналах с разными гидравлическими диаметрами и рабочими веществами, такими как R134a, R410A, водо-воздушные смеси и вода. В статье представлены схемы экспериментальных стендов как с мини-, так и с микроканалами для исследования режимов кипения, а также определения коэффициентов теплоотдачи. Показана целесообразность продолжения исследования теплообмена и гидродинамики в миниканалах, основываясь на комплексном подходе, включающем исследования режимов кипения, истинного паросодержания, локального теплообмена и перепадов давления. Представлена схема экспериментального стенда. Ключевые слова: хладоносители; теплогидродинамические характеристики; кипение хладагентов; миниканальный теплообменник; экспериментальный стенд.","PeriodicalId":91841,"journal":{"name":"ASHRAE winter conference papers. American Society of Heating, Refrigeration and Air-Conditioning Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88419137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-12-05DOI: 10.17586/2310-1148-2016-9-4-6-15
A.Yu. Grigoriev, D. Zhignovskaya
{"title":"The review and the analysis aero - and thermodynamic processes in an aperture with an air and thermal veil","authors":"A.Yu. Grigoriev, D. Zhignovskaya","doi":"10.17586/2310-1148-2016-9-4-6-15","DOIUrl":"https://doi.org/10.17586/2310-1148-2016-9-4-6-15","url":null,"abstract":"","PeriodicalId":91841,"journal":{"name":"ASHRAE winter conference papers. American Society of Heating, Refrigeration and Air-Conditioning Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83647853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-12-05DOI: 10.17586/2310-1148-2016-9-4-62-70
U. D. Rumantcev, F. O. Veselkin
{"title":"Analysis of the thermal load of cooling systems refrigeration vehicles","authors":"U. D. Rumantcev, F. O. Veselkin","doi":"10.17586/2310-1148-2016-9-4-62-70","DOIUrl":"https://doi.org/10.17586/2310-1148-2016-9-4-62-70","url":null,"abstract":"","PeriodicalId":91841,"journal":{"name":"ASHRAE winter conference papers. American Society of Heating, Refrigeration and Air-Conditioning Engineers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88705117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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