Halime Paksoy

Heating and cooling of a hospital using solar energy coupled with seasonal thermal energy storage in an aquifer

A system is being designed, using solar energy in combination with Aquifer Thermal Energy Storage (ATES), that will conserve a major part of the oil and electricity used for heating or cooling the Cukurova University, Balcali Hospital in Adana, Turkey. The general objective of the system is to provide heating and cooling to the hospital by storing solar heat underground in summer and cold in winter. As the main source of cold energy, ventilation air at the hospital and surface water from the nearby Seyhan Lake will be used.

Determining thermal properties of heat storage materials using the twin bath method

The thermal properties of paraffin, high density polyethylene, zinc nitrate tetrahydrate, ethylene glycol, and brick are determined using the twin bath method. The heat storage capacities of the materials with and without the effect of container are measured. The heating and cooling curve for zinc nitrate tetrahydrate is obtained to detect its supercooling tendency.

The performance of UNIFAC and related group contribution models part II. Prediction of Henry's law constants

Henrys law constants for 24 different systems have been determined using UNIFAC and related group contribution models. The results obtained from original, modified and free-volume effect UNIFAC models are compared with experimental results. Empirical relationships for the temperature-dependency of Henrys constant for the chloroform(l) water(2) system are also determined.

Sustainable energy management

Purpose – Bilateral project with Slovenia and Turkey with the title thermal energy storage for efficient utilization of solar energy was the basis for this paper. The paper aims to discuss this issue. Design/methodology/approach – The paper is the review of solar thermal storage technologies with examples of use in Slovenia and Turkey. Findings – The authors have found out that compact and cost effective thermal energy storage are essential. Research limitations/implications – Research on the field of thermal energy storage in Slovenia and Turkey is presented. Practical implications – The paper presents solar systems in Slovenia and Turkey. Originality/value – The paper gives information about the sustainable energy future on the basis of solar energy.

The performance of UNIFAC and related group contribution models Part I. Prediction of infinite dilution activity coefficients

Infinite dilution activity coefficients have been calculated for 24 systems including highly non-ideal and nearly non-ideal using original, modified UNIFAC and UNIFAC-FV models. The calculations are compared with experimental results. The performance of the models in predictions and the significance of free volume effects on solvent activities in solutions containing small compounds are discussed.

2.14 Latent Heat Storage Systems

Thermal energy storage is a key technology to address the challenges in the transition to a low carbon energy system. Latent heat storage (LHS) is one of these technologies that have special features of enabling isothermal and compact storage. Recently, there has been an increasing interest in LHS applications and phase change material development. This chapter gives an overview on fundamentals, applications, and recent trends on LHS materials.

Characterization of Concrete Mixes Containing Phase Change Materials

Phase change materials (PCM) can be used in passive building applications to achieve near zero energy building goals. For this purpose PCM can be added in building structures and materials in different forms. Direct incorporation, form stabilization and microencapsulation are different forms used for PCM integration in building materials. In addition to thermal properties of PCM itself, there are several other criteria that need to be fulfilled for the PCM enhanced building materials. Mechanical properties, corrosive effects, morphology and thermal buffering have to be determined for reliable and long-term applications in buildings. This paper aims to give an overview of characterization methods used to determine these properties in PCM added fresh concrete mixes. Thermal, compressive strength, corrosion, and microscopic test results for concrete mixes with PCM are discussed.

Microcapsulation and Macrocapsulation of Phase Change Materials by Emulsion Co-polymerization Method

In this study, decanoic acid suitable for thermal energy storage applications was microencapsulated with poly(styrene-co-ethyl acrylate) by emulsion co- polymerization method. Chemical structures, morphological characteristics, and thermal properties of microcapsules and macrocapsules were determined using Fourier Transfer Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), and Differential Scanning Calorimeters (DSC) respectively. The microPCMs and macroPCMs were synthesized successfully and the encapsulation ratio was about up to 65.5 %. As a result, the as-prepared microcapsules show good potentials for thermal energy storage and could be used in many applications.