Numerical calculation of psychrometric properties on a calculator

Singh, A.K.; Singh, Harpal; Singh, S. P.; Sawhney, Ravinder Singh

doi:10.1016/s0360-1323(01)00032-4

Cited by 48 publications

(32 citation statements)

References 2 publications

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“…This behavior can be attributed to the rising of other gases like ammonia, carbon dioxide and water vapor; this fact comes from the changes on dissociative potential and psychometrics status of these gases (SINGH et al, 2002). FIGURE 3.…”

Section: Resultsmentioning

confidence: 99%

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Effect of a simulated heat wave in thermal and aerial environment broiler-rearing environment

et al. 2016

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Global warming increases the occurrence of events such as extreme heat waves. Research on thermal and air conditions affecting broiler-rearing environment are important to evaluate the animal welfare under extreme heat aiming mitiga tion measures. This study aimed at evaluating the effect of a simulated heat wave, in a climatic chamber, on the thermal and air environment of 42-day-old broilers. One hundred and sixty broilers were housed and reared for 42 days in a climatic chamber; the animals were divided into eight pens. Heat wave simulation was performed on the 42 nd day, the period of great impact and data sampling. The analyzed variables were room and litter temperatures, relative humidity, concentrations of oxygen, carbon monoxide and ammonia at each pen. These variables were assessed each two hours, starting at 8 am, simulating a day heating up to 4 pm, when it is reached the maximum temperature. By the results, we concluded that increasing room temperatures promoted a proportional raise in litter temperatures, contributing to ammonia volatilization. In addition, oxygen concentrations decreased with increasing temperatures; and the carbon monoxide was only observed at temperatures above 27.0 °C, relative humidity higher than 88.4% and litter temperatures superior to 30.3 °C.KEYWORDS: ammonia, gas production, animal welfare, oxygen, litter temperature ONDA DE CALOR SIMULADA E SEU IMPACTO NO AMBIENTE TÉRMICO E AÉREO DE FRANGOS DE CORTE RESUMO:O aquecimento global aumenta a ocorrência de eventos extremos como as ondas de calor. Pesquisas sobre como as condições térmicas e aéreas afetam o ambiente de produção de frangos de corte são importantes para se avaliar o bem-estar animal sob condições extremas de calor, objetivando medidas mitigadoras. Este estudo pretende avaliar o efeito da simulação de ondas de calor em câmara climática, sobre o ambiente térmico e aéreo de frangos de corte com 42 dias de idade. 160 frangos foram alojados e criados, de 1 a 42 dias de idade, em câmara climática que foi dividida em oito baias. A simulação de onda de calor foi realizada no 42º dia de criação das aves, memento de maior impacto e da coleta dos dados. As variáveis foram coletadas em intervalos de duas horas a partir das 8 horas da manhã, simulando o aquecimento do dia até às 16 horas, horário de máxima, sendo coletados temperatura ambiente, temperatura da cama, umidade relativa do ar, concentrações de oxigênio, monóxido de carbono e amônia em cada baia, nos intervalos de duas em duas horas. Com os resultados obtidos na câmara climática, foi possível concluir que o aumento da temperatura ambiente ocasionou aumento na temperatura da cama, o que, consequentemente, contribuiu para o aumento da volatilização da amônia. A concentração de oxigênio foi reduzida enquanto a temperatura foi aumentada. A presença de monóxido de carbono foi observada quando a temperatura ambiente estava acima de 27,0 ºC, a umidade relativa superior a 88,4% e a temperatura da cama estava superior a 30,3 ºC. PALAVRAS-CHAVE:amônia, bem-estar an...

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Section: Resultsmentioning

confidence: 99%

“…One is the evaporation from changes in the psychometric traits within the environment (SINGH et al, 2002). Another would be an increased evaporation due to litter temperature growth along with a metabolic heat output by microbial activity (KELLEHER et al, 2002).…”

Section: Resultsmentioning

confidence: 99%

Effect of a simulated heat wave in thermal and aerial environment broiler-rearing environment

et al. 2016

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“…A.K. Singh, et al gave equations for determination of psychrometric properties, with any given two psychrometric properties of an air-water mixture by using perfect gas relationships [41].…”

Section: B Solution Approaches In Analysis Simulation and Modellingmentioning

confidence: 99%

Energy Conservation in Buildings – a Review

Thapa¹,

Panda²

2015

IJEE

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Abstract-The primary function of a building is to provide thermally comfortable environment to its occupants. A good indoor climate is important for the success of any building, not only because it will make its occupants comfortable, but also because it will decide its energy consumption, and thus influences its sustainability. A literature review of over 100 research papers, in four areas in the field of Energy Conservation in Buildings, i.e. (i) Climate Responsive Buildings, (ii) Analysis, Simulation and Modelling, (iii) Zero Energy Buildings and (iv) Thermal Comfort, were conducted in order to obtain a valid research topic. The findings of the literature survey is presented in this paper which include issue wise discussion, solution approaches used by various researchers, strengths, weaknesses and future scope of work in the four issues pertaining to energy conservation in buildings. Out of the several identified lag, it was felt that there was a dearth of field studies based thermal comfort research in India, which is essential for the correct definition of building codes. Proper building codes are required not only for providing comfort condition but also to conserve energy. Hence field studies based thermal comfort study was considered for further research study. Thus, this paper summarizes the researches about Climate Responsive Buildings, Analysis, Simulation and Modelling, Zero Energy Buildings and Thermal Comfort. It also concludes the methodology of these researches in above four fields, and gives further work suggestions.

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“…) is the air density; h sp (J kg -1°C-1 ) is the specific heat capacity of air at constant pressure; V heat is the specific ventilation rate (m ); η is the cooling pad efficiency (dimensionless; its value depends on the ventilation rate); and T d (°C) is the dew point temperature of the outside air (calculated from the outside relative humidity and the outside air temperature; Singh et al 2002).…”

Section: Steady-state Balance Modelmentioning

confidence: 99%

Effect of temperature increase on cooling systems in livestock farms

Valiño¹,

Perdigones²,

Iglesias³

et al. 2010

Clim. Res.

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We developed a methodology to evaluate the changes in cooling technologies of agricultural buildings derived from different scenarios of global climate change. Four 2080s scenarios were analysed for 6 European locations, using as a case study fattening pig farms and 3 cooling technologies: natural and forced ventilation, and cooling pads. The climate scenarios were constructed as a combination of general circulation models (Had CM2 and ECHAM4) downscaled for Europe with the HIRHAM and RCA3 regional models and driven by the A2 and B2 socio-economic scenarios. A steady-state heat balance model was used for the energy analysis in the livestock farms. The results showed that no changes in cooling technologies are necessary in the Mediterranean Basin; cooling pads were efficient enough for adequate climatisation both in the present and future scenarios. In northern European locations results were different, depending on the future scenario. Most scenarios indicated that cooling pads will be needed in fattening pig farms in the 2080s, while ventilation is efficient enough in the present scenario. The economic consequences will be important, as the costs associated with cooling pads are much higher than the costs of natural or forced ventilation.

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Numerical calculation of psychrometric properties on a calculator

Cited by 48 publications

References 2 publications

Effect of a simulated heat wave in thermal and aerial environment broiler-rearing environment

Effect of a simulated heat wave in thermal and aerial environment broiler-rearing environment

Energy Conservation in Buildings – a Review

Effect of temperature increase on cooling systems in livestock farms

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