A Mathematical Model Featuring Time Lag and Decrement Factor to Assess Indoor Thermal Conditions in Low-Income-Group House

Netam, Nisha; Sanyal, Shubhashis; Bhowmick, Shubhankar

doi:10.18186/thermal.728054

Cited by 3 publications

(4 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The analytical solution [20] reveals the physical nature of the TL and DF, shows the factors on which their intensity depends. But the direct use of [22] for engineering calculations is not accessible, since the conditions, for which the analytical solution was obtained, differ from the actual operating conditions of the fences of cold stores.…”

Section: Insmentioning

confidence: 99%

“…High DF values help to improve conditions for constant temperature maintaining inside buildings. The need to find solutions to provide the proper level of comfort and to reduce energy consumption for heating and air conditioning in residential and public buildings has stimulated research activity and contributed to the publication of a wide range of scholarly works focused on the issue [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…A rational choice of building materials is important to reduce the cost of building walls at a given value of their thermal inertia. The research and studies of thermal inertia are carried out by methods of in situ experiments [9,[12][13][14][15][16][17] and mathematical simulations [6,7,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Temperature Waves Phase Optimal Time Lag in the Refrigerated Warehouse Thermal Insulation

Myronchuk

Khmelniuk

2022

Gazi University Journal of Science

View full text Add to dashboard Cite

The thermal inertia of the wall manifests itself as a damping of amplitude (Decrement Factor) as well as a temperature wave phase lag (Time Lag) upon its passing through the wall. The objective of the research was to highlight the utilization prospects of these phenomena in the building envelops of large refrigerated warehouses. Numerical methods were used for nonlinear, non-stationary processes simulation. The relationship of the refrigeration cycle to the thermo-insulating walls of the cold store in the conditions of daily external temperature oscillations and solar radiation flux has been studied. As the ambient temperature rises, the power efficiency of the refrigeration cycle is decreasing and the need to increase the compressor displacement is growing. If the value of the phase delay in the wall is optimum, the daily minimum of the heat leakage through the wall enters the chamber with the phase shift for the period of maximum daily external temperature. This enables to smooth out the daily oscillations amplitudes of the heat load of the refrigerating machine as well as compressor power rating and to approximate their peak values closer to the average daily ones. The study had been concluded by demonstrating the possibility of reduction in: heat exchange areas for both condenser and evaporator, receiver volume, diameter of pipelines, material cost. Better conditions for temperature stabilization in the cold store will enhance the keeping quality and prolong the food products shelf life.

show abstract

Section: Insmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Temperature Waves Phase Optimal Time Lag in the Refrigerated Warehouse Thermal Insulation

Myronchuk

Khmelniuk

2022

Gazi University Journal of Science

View full text Add to dashboard Cite

show abstract

“…As reported by Chandel and Aggarwal [104], people in India during the winter season normally wearing "sweater, jacket, inner thermal, socks, cap" compared to the 0.9 clo value "sweater, long sleeve shirt, heavy slacks" which recommended by ASHRAE. However, pantry car chef 's generally wearing clothes according to Indian style outfits while performing the cooking period inside the kitchen of the railway pantry car [128][129][130][131][132][133][134]. Present study clothing value can be estimated for the "summer" and "winter" season as per the recommended Table 5.…”

Section: Specific Individual Living Assessment Ranges Of Air Velocitymentioning

confidence: 99%

Factors affecting on human thermal comfort inside the kitchen area of railway pantry car - a review

Alam

Salve

2021

Journal of Thermal Engineering

View full text Add to dashboard Cite

Railway transportation plays a significant contribution to carrying passengers in India. In which during the journey, pantry cars are involved to serves the food to all onboard passengers. The kitchen atmosphere of the pantry car gets very hot and humid during cooking which could affect occupants' thermal comfort. Therefore, the current research article describes a review of the factors affecting human thermal comfort inside the kitchen of the railway pantry car. The factors influencing of human thermal comfort inside pantry car kitchens are classified into two categories viz; environmental factors that include "air temperature, mean radiant temperature, relative humidity, air velocity" and personal or individual factors including "metabolic rate and clothing insulation". All these factors need to be considered in order to achieve the optimum level of thermal comfort inside the kitchen environment of the pantry car. With the assistance of all these factors, we can estimate the thermal comfort indices such as; SET "standard effective temperature, " PMV "predicted mean vote, " PPD "predicted the percentage of dissatisfied, " thereby recognizing the acceptable thermal sensation range for occupants' (chefs) in the pantry car kitchens during the work period. These kinds of parametric studies can cover a wide group of all pantry car chefs in evaluating thermal comfort. Furthermore, there is a need to apply all the consequences of this research to increase the chef 's thermal comfort inside the pantry car kitchen while working.

show abstract

Comparison of thermal response times of historical and modern building wall materials

Yüksel

Arıcı

Karabay

2021

Journal of Thermal Engineering

View full text Add to dashboard Cite

The study aims to identify the main reason of the thermal response time difference between historical and modern buildings. Therefore, in this study, the thermal response time of historical and modern wall structures and its effect on the interior air temperature change was investigated parametrically. Considering the environmental conditions of Kocaeli province, Turkey, the thermal response time of a historical building wall made of a cut stone was compared with those of brick and gas concrete wall structures having the same overall heat transfer coefficient using the second-order lumped capacitance approach. The insulation thicknesses of the three different construction materials for U-values of 0.6, 0.4 and 0.2 W/m 2 K were calculated and temperature variations of indoor environment, wall and insulation material were analyzed. In addition, the required thicknesses of insulation material to obtain the same heat transfer coefficients were determined in case of using the 0.1 m thickness of cut stone, brick and gas concrete structure materials. The maximum and minimum amplitudes of the inside air temperature were recorded as 0.59 and 0.18 o C for the aerated concrete in Case 3 and for the cut stone in Case 2, respectively. As a result, the walls with high thermal inertia are less affected by the changes in the environmental temperature although their U-value is relatively high. For this reason, it can be stated that one of the reasons why historical buildings have thick walls is to increase thermal inertia and thereby improve thermal comfort by reducing energy loss.

show abstract

A Mathematical Model Featuring Time Lag and Decrement Factor to Assess Indoor Thermal Conditions in Low-Income-Group House

Cited by 3 publications

References 26 publications

Temperature Waves Phase Optimal Time Lag in the Refrigerated Warehouse Thermal Insulation

Temperature Waves Phase Optimal Time Lag in the Refrigerated Warehouse Thermal Insulation

Factors affecting on human thermal comfort inside the kitchen area of railway pantry car - a review

Comparison of thermal response times of historical and modern building wall materials

Contact Info

Product

Resources

About