Implementation of Solar Thermal Driven Absorption Cooling in the Southeast

2010 ◽  
Author(s):  
Stephen M. Smith
Keyword(s):  
Heating System ◽  
Hot Water ◽  
Solar Thermal ◽  
Absorption Chiller ◽  
Solar Absorption ◽  
Modeling Process ◽  
Annual Behavior ◽  
Cooling Loads ◽  
Radiant Floor Heating ◽  
Floor Heating

A 35,000 ft2 [3,251 m2] Creative Arts instruction building is being constructed on the campus of Haywood Community College in Clyde, NC (∼25 miles [40 km] west of Asheville). The building’s HVAC system consists of a solar absorption chiller, two parallel back-up electric chillers, and radiant floor heating with condensing boiler back-up. Hot water is to be heated by 117 solar thermal panels with thermal energy storage in a 12,000 gallon [45,000 liters] insulated tank and service to both the absorption chiller and the radiant under-floor heating system. Peak cooling loads and unfavorable solar conditions are to be handled by parallel electric chillers, operated in sequence to achieve maximum performance. Emergency radiant under-floor heating hot water back-up is to be handled by gas-fired condensing boilers in the event of unavailable solar heated hot water. This paper will examine the extensive modeling process required of the system as performed in EnergyPlus, how preliminary modeling results influenced the control and design strategy, the annual behavior of the system and the importance of controllability.

Experiment Based Performance Analysis of a Solar Absorption Cooling and Heating System in Carnegie Mellon University

2008 ◽  
Author(s):  
Ming Qu ◽  
David H. Archer ◽  
Hongxi Yin
Keyword(s):  
Residential Buildings ◽  
Heating System ◽  
Test System ◽  
Hot Water ◽  
Small Scale ◽  
Absorption Chiller ◽  
Solar Absorption ◽  
Solar Cooling ◽  
Absorption Cooling ◽  
Solar Absorption Cooling

The center for building performance and diagnostic (CBPD) at Carnegie Mellon University has successfully designed, installed and tested a solar cooling and heating system to assess the feasibility of solar cooling for small scale commercial buildings or residential buildings with aspects of technology and energy efficiency. This solar cooling and heating system is primarily comprised of parabolic trough solar collectors, PTSC’s and a 16 kW dual energy source double effect (2E) absorption chiller. The 2E absorption chiller driven by PTSCs was tested to produce chilled water or hot water throughout a number of clear days in summer and winter. The analyses of the experimental data defined the system performance: the efficiency of the solar collector, the capacity and COP of the chiller, and the heat transfer coefficient of the heat recovery exchanger, by using a statistical approach, based on the energy balance equation. In the solar cooling tests during July 2007 in Pittsburgh, PA, the average efficiency of PTSCs was 35% when they were operated at about 155°C for driving the 2E absorption chiller and the chiller was able to provide 8 to 14 kW cooling with COP in the range 1.0 to 1.2; the overall system efficiency is in the range 0.35 to 0.41. In the near future, this solar absorption cooling and heating test system and its operation will be integrated with the cooling, heating and ventilation units for long term utilization.

Simulation Analysis of Heat Transfer on Low Temperature Hot-Water Radiant Floor Heating and Electrical Radiant Floor Heating

2012 ◽  
Vol 204-208 ◽  
pp. 4234-4238
Author(s):  
Han Bing Qi ◽  
Fu Yun He ◽  
Qiu Shi Wang ◽  
Dong Li ◽  
Lin Lin
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Low Temperature ◽  
Heating System ◽  
Heat Transfer Process ◽  
Hot Water ◽  
Radiant Heating ◽  
Radiant Floor Heating ◽  
Heating Mode ◽  
Floor Heating

Radiant floor heating as a new type of energy-saving heating method has more and more used in modern building heating project. According to the different heat source, radiant floor heating is divided into low temperature hot-water floor radiant heating and electrical floor radiant heating. This paper analyzes the heat transfer process of structure layer of the low temperature hot-water and electrical floor radiant heating system, establishes two dimensional steady heat transfer mathematic model, numerical calculation using Fluent software. Respectively simulated when floor materials is different, the heat transfer process of low temperature hot-water floor radiant heating and electrical floor radiant heating system, The analysis results show that: for low temperature hot-water floor radiant heating, when floor material is soft wood, the ground temperature distribution is more uniform; for electrical floor radiant heating, when floor materials is marble, the ground temperature distribution is more uniform; electrical floor radiant heating is more energy saving, and temperature distribution in the ground of floor using the constant heat flux electric heating mode is more uniform than which using the low temperature hot water heating mode.

scholarly journals Analysis of Thermal Performance and Energy Saving Potential by PCM Radiant Floor Heating System based on Wet Construction Method and Hot Water

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 828 ◽  
Author(s):  
Sanghoon Baek ◽  
Sangchul Kim
Keyword(s):  
Energy Saving ◽  
Thermal Performance ◽  
Indoor Air ◽  
Heating System ◽  
Hot Water ◽  
Set Point ◽  
Energy Saving Potential ◽  
Radiant Floor Heating System ◽  
Radiant Floor Heating ◽  
Floor Heating

A phase change material (PCM) is an energy storage mass with high heat storage performance. In buildings, PCMs can be utilized to save energy in radiant floor heating systems. This study aims to analyze the thermal performance and energy saving potential by the PCM radiant floor heating system based on wet construction method and hot water. For such analysis, EnergyPlus program was used. As for the results, it was found that the proposed system almost maintained the set point of indoor air and a floor surface. Moreover, when a 10 mm PCM was applied, it was possible to save 2.4% of heating energy annually compared to existing buildings. In particular, when a 20–50 mm PCM was applied, it was found that 7.3–15.3% of heating energy was reduced annually. If indoor air temperature exceeds the comfort range of the proposed system, this problem can be solved by adjusting the set point of the floor surface or by increasing the temperature of hot water.

scholarly journals Analysis of the Thermal Storage Performance of a Radiant Floor Heating System with a PCM

Molecules ◽  
2019 ◽  
Vol 24 (7) ◽  
pp. 1352 ◽  
Author(s):  
JinChul Park ◽  
TaeWon Kim
Keyword(s):  
Heat Storage ◽  
Waste Heat ◽  
Heating System ◽  
Hot Water ◽  
Current Status ◽  
Indoor Environments ◽  
Storage Performance ◽  
Radiant Floor Heating System ◽  
Radiant Floor Heating ◽  
Floor Heating

This study first reviewed previous studies on floor heating systems based on the installation of a phase change material (PCM) and the current status of technical developments and found that PCM-based research is still in its infancy. In particular, the improvement of floor heat storage performance in indoor environments by combining a PCM with existing floor structures has not been subject to previous research. Thus, a PCM-based radiant floor heating system that utilizes hot water as a heat source and can be used in conjunction with the widespread wet construction method can be considered novel. This study found the most suitable PCM melting temperature for the proposed PCM-based radiant floor heating system ranged from approximately 35 °C to 45 °C for a floor thickness of 70 mm and a PCM thickness of 10 mm. Mock-up test results, which aimed to assess the performance of the radiant floor heating system with and without the PCM, revealed that the PCM-based room was able to maintain a temperature that was 0.2 °C higher than that of the room without the PCM. This was due to the rise in temperature caused by the PCM’s heat storage capacity and the emission of waste heat that was otherwise lost to the underside of the hot water pipe when the PCM was not present.

Solar Absorption Cooling and Heating System in the Intelligent Workplace

2007 ◽  
Author(s):  
Ming Qu ◽  
David H. Archer ◽  
Hongxi Yin ◽  
Sophie Masson
Keyword(s):  
Solar System ◽  
Thermal Energy ◽  
Heating System ◽  
Energy System ◽  
Solar Thermal ◽  
Absorption Chiller ◽  
Solar Absorption ◽  
Absorption Cooling ◽  
Trnsys Modeling ◽  
Solar Absorption Cooling

A solar thermal driven absorption cooling and heating system has been installed in Carnegie Mellon University’s Robert L. Preger intelligent Workplace, the IW. The purpose of this solar installation is to investigate the technical and economic aspects of using high temperature solar thermal receivers driving a two stage absorption chiller to cool and heat a building space. The solar system consists primarily of 52 m2 of single-axis tracking parabolic trough solar collectors (PTSC), and a 16 kW double effect absorption chiller driven by either a fluid heated in solar receivers or by natural gas fuel. The receivers convert solar radiation to thermal energy in a heated fluid; the chiller then uses this energy in summer to generate chilled water. In winter, the thermal energy is directly used for heating. A performance analysis was carried out to estimate the conversion efficiency of the PTSC based on mass and energy balances and heat transfer computations programmed in Engineering Equation Solver (EES). The performance of the overall solar cooling and heating for the IW has been programmed in TRNSYS modeling system. This solar energy system has been estimated to provide 38–50% of the cooling and 9–30% of heating energy depending upon orientation, insulation and storage capacity for 245 m2 of space in the IW. Experimental data are now being collected and will be used for validating the solar collector model. The solar system model will be used in interpreting the data yet to be obtained on the system performance. The primary purpose of this research program is the development of systems which reduce the energy requirements for the operation of buildings by a factor of two or greater, and the provision of techniques and tools for the design and evaluation of such systems.

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