scholarly journals Simulation Study for Control Strategies of Indoor Air Temperature in Floor Radiant Heating System

2016 ◽  
Vol 12 (4) ◽  
pp. 21-26
Author(s):  
Jae-Yeob Song ◽  
Byung-Cheon Ahn
Keyword(s):  
Air Temperature ◽  
Indoor Air ◽  
Simulation Study ◽  
Control Strategies ◽  
Heating System ◽  
Radiant Heating

scholarly journals Research on Control Property of Low-temperature Floor Radiant Heating System

2015 ◽  
Vol 9 (1) ◽  
pp. 311-315 ◽  
Author(s):  
Enfu Yang
Keyword(s):  
Low Temperature ◽  
Air Temperature ◽  
Indoor Air ◽  
Control Strategies ◽  
Heating System ◽  
Radiant Heating ◽  
Wide Range ◽  
New Energy ◽  
Radiant Floor Heating ◽  
Floor Heating

A new energy-efficient and comfortable heating system, low-temperature floor radiant heating system of floor radiation is increasingly applied to a wide range of housing construction. In the paper, establishing the model of radiant floor heating systems, the effect of outdoor temperature, enclosure structures and heating storage characteristics that influence the indoor air temperature and the enclosure temperature, have been analyzed. The fuzzy-PID controller is chosen as the control radiant floor heating system. Several control strategies such as air-based control, slab-based control, and twoparameter control have been compared. Two-parameter control based on the floor surface temperature and the indoor air temperature is very stable, with high initial investment.

Indoor Air Temperature Analysis of Solar Heating System With Dual Heat Storage Devices

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Yu Qihui ◽  
Hao Xueqing ◽  
Tan Xin
Keyword(s):  
Mathematical Model ◽  
Air Temperature ◽  
Indoor Air ◽  
Storage Tank ◽  
Heat Storage ◽  
Heating System ◽  
Solar Heating ◽  
Minimum Size ◽  
Temperature Characteristics ◽  
Storage Devices

Using solar energy for space heating is an efficient and simply way to satisfy the energy demands of buildings. In this study, a typical office building is selected as a case model to obtain indoor air temperature characteristics with dual heat storage devices. By analyzing our solar heating system, a mathematical model of the system working process is set up. Using the software matlab/simulink for simulation, the indoor air temperature characteristics in 1 day are obtained. Simulation and experimental results show good consistency. And using the mathematical model, the storage tank size is optimized to search for the minimum size for the fixed building. Based on our analysis, the optimum ratio of storage tank A volume and collector field area is 0.11 m. This research can be a good reference for the design of the solar heating system.

scholarly journals Simulation study on capillary asymmetric radiant heating system

2017 ◽  
Vol 205 ◽  
pp. 2215-2222 ◽  
Author(s):  
Xuelai Liu ◽  
Lina Shi ◽  
Yongan Li
Keyword(s):  
Simulation Study ◽  
Heating System ◽  
Radiant Heating

scholarly journals Thermal and Surface Radiosity Analysis of an Underfloor Heating System in a Bioclimatic Habitat

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3880
Author(s):  
Abdelkader Laafer ◽  
Djaffar Semmar ◽  
Abdelkader Hamid ◽  
Mahmoud Bourouis
Keyword(s):  
Heat Transfer ◽  
Air Temperature ◽  
Indoor Air ◽  
Heating Surface ◽  
Heating System ◽  
Pilot Project ◽  
Heat Transfer Fluid ◽  
Fluid Temperature ◽  
The Stability ◽  
A Site

This paper addresses the modeling of convective and radiative heat transfer to achieve an acceptable level of indoor temperature. The results presented were obtained in a pilot project in which an energy-efficient house was built on a site located west of Algiers. The main objective was to perform a numerical simulation to investigate how the temperature of the heat-transfer fluid circulating in the floor heating system affected the temperature of the indoor air and also how surface radiosity affected the temperature profile of the indoor air. The study employed the finite element method integrated into the Comsol Multiphysics software. The model was validated using experimental data reported in the literature for the pilothouse at the same meteorological conditions. An error of about 2.32% was apparent between the experimental and theoretical results. Results showed that the increase of the heating transfer fluid temperature from 30 to 50 °C produced the same temperature of about 15.1 °C taken at a 50 cm height inside the room. The air temperature remained stable, with an insignificant variation after 72 h of heating. Surface radiosity increased as a function of time and reached an almost constant value of 380 W·m−2 after 72 h because of the stability of the air temperature by convection.

Energy Saving Analysis on Solar Capillary Radiation Heating System

2013 ◽  
Vol 448-453 ◽  
pp. 2807-2814 ◽  
Author(s):  
Jin Shun Wu ◽  
Song Pan ◽  
Jun Wei ◽  
Hong Wei Liu ◽  
Yi Xuan Wei ◽  
...  
Keyword(s):  
Water Temperature ◽  
Energy Saving ◽  
Air Temperature ◽  
Indoor Air ◽  
Solar Collector ◽  
Experimental System ◽  
Heating System ◽  
Capillary Network ◽  
Water Volume ◽  
Low Grade

Radiation capillary used as air conditioning terminal lower the demand of heating water temperature. In additional, solar collectors could also supply amount of low grade energy for heating. Meanwhile, solar is a kind of renewable, sustainable and environment friendly energy. It will save a massive of conventional energy if make full use of solar for heating. In this paper, an experimental system made of solar collector, capillary network and pump was built up and tested. According to thermal load of experimental room, both solar collector area and capillary network area are calculated, and circulating water temperature was analyzed in detail. A summary is given about characteristics of heat storage and release of solar collector, indoor air temperature varying and amount of energy saving. The key factors affect efficiency of collector includes water volume, water temperature in tanker and indoor air temperature. The results show that the solar system can well meet the heating demand and the effect of energy saving is very significant compared to common heating system.

scholarly journals Airflow and Heat Transfer in the Slot-Vented Room with Radiant Floor Heating Unit

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Xiang-Long Liu ◽  
Guang-Cai Gong ◽  
Heng-Sheng Cheng ◽  
Li-Xing Ding
Keyword(s):  
Heat Transfer ◽  
Air Temperature ◽  
Indoor Air ◽  
Heating System ◽  
Outer Wall ◽  
Heating Unit ◽  
Thermal Boundary Conditions ◽  
Airborne Pollutant ◽  
Radiant Floor Heating ◽  
Floor Heating

Radiant floor heating has received increasing attention due to its diverse advantages, especially the energy saving as compared to the conventional dwelling heating system. This paper presents a numerical investigation of airflow and heat transfer in the slot-vented room with the radiant floor heating unit. Combination of fluid convection and thermal radiation has been implemented through the thermal boundary conditions. Spatial distributions of indoor air temperature and velocity, as well as the heat transfer rates along the radiant floor and the outer wall, have been presented and analyzed covering the domains from complete natural convection to forced convection dominated flows. The numerical results demonstrate that the levels of average temperature in the room with lateral slot-ventilation are higher than those without slot-ventilation, but lower than those in the room with ceiling slot-ventilation. Overall, the slot-ventilation room with radiant floor heating unit could offer better indoor air quality through increasing the indoor air temperature and fresh air exchanging rate simultaneously. Concerning the airborne pollutant transports and moisture condensations, the performance of radiant floor heating unit will be further optimized in our future researches.

Simulation of the internal temperature in the Passol Laboratory, University of Debrecen

2012 ◽  
Vol 3 (1) ◽  
pp. 63-73 ◽  
Author(s):  
I. Csáky ◽  
F. Kalmár
Keyword(s):  
Temperature Variation ◽  
Air Temperature ◽  
Indoor Air ◽  
Storage Capacity ◽  
Building Structures ◽  
Internal Temperature ◽  
The One ◽  
Heavy Structure ◽  
East West ◽  
Made In

Abstract Nowadays the facades of newly built buildings have significant glazed surfaces. The solar gains in these buildings can produce discomfort caused by direct solar radiation on the one hand and by the higher indoor air temperature on the other hand. The amplitude of the indoor air temperature variation depends on the glazed area, orientation of the facade and heat storage capacity of the building. This paper presents the results of a simulation, which were made in the Passol Laboratory of University of Debrecen in order to define the internal temperature variation. The simulation proved that the highest amplitudes of the internal temperature are obtained for East orientation of the facade. The upper acceptable limit of the internal air temperature is exceeded for each analyzed orientation: North, South, East, West. Comparing different building structures, according to the obtained results, in case of the heavy structure more cooling hours are obtained, but the energy consumption for cooling is lower.

scholarly journals Energy Saving and Charging Discharging Characteristics of Multiple PCMs Subjected to Internal Air Flow

Fluids ◽  
2021 ◽  
Vol 6 (8) ◽  
pp. 275
Author(s):  
Ahmed J. Hamad
Keyword(s):  
Phase Change ◽  
Energy Saving ◽  
Air Temperature ◽  
Temperature Control ◽  
Phase Change Materials ◽  
Energy Savings ◽  
Heating System ◽  
Air Heating ◽  
Room Model ◽  
Model Temperature

One essential utilization of phase change materials as energy storage materials is energy saving and temperature control in air conditioning and indirect solar air drying systems. This study presents an experimental investigation evaluating the characteristics and energy savings of multiple phase change materials subjected to internal flow in an air heating system during charging and discharging cycles. The experimental tests were conducted using a test rig consisting of two main parts, an air supply duct and a room model equipped with phase change materials (PCMs) placed in rectangular aluminum panels. Analysis of the results was based on three test cases: PCM1 (Paraffin wax) placed in the air duct was used alone in the first case; PCM2 (RT–42) placed in the room model was used alone in the second case; and in the third case, the two PCMs (PCM1 and PCM2) were used at the same time. The results revealed a significant improvement in the energy savings and room model temperature control for the air heating system incorporated with multiple PCMs compared with that of a single PCM. Complete melting during the charging cycle occurred at temperatures in the range of 57–60 °C for PCM1 and 38–43 °C for PCM2, respectively, thereby validating the reported PCMs’ melting–solidification results. Multiple PCMs maintained the room air temperature at the desired range of 35–45.2 °C in the air heating applications by minimizing the air temperature fluctuations. The augmentation in discharging time and improvement in the room model temperature using multiple PCMs were about 28.4% higher than those without the use of PCMs. The total energy saving using two PCMs was higher by about 29.5% and 46.7% compared with the use of PCM1 and PCM2, respectively. It can be concluded that multiple PCMs have revealed higher energy savings and thermal stability for the air heating system considered in the current study.

Sign in / Sign up

Export Citation Format

Share Document