The application of an absorption heat pump for cogeneration electricity and heat production

W pracy przedstawiono wyniki obliczeń symulacyjnych uciepłownienia nadkrytycznego bloku parowego na potrzeby dedykowanego odbiorcy ciepła. Na podstawie wykresu uporządkowanego temperatur dla lokalizacji odbiorcy ciepła oraz tabeli regulacyjnej parametrów dostarczanego ciepła rozważono dwa warianty uciepłownienia bloku parowego: pierwszy za pomocą dedykowanego wymiennika ciepła (DWC) zasilanego parą z upustu turbiny, drugi za pomocą absorpcyjnej pompy ciepła APC pracującej jako podstawowe źródlo ciepla wraz wymiennikiem szczytowym (SWC). Opierając się na wymaganych przez odbiorcę parametrach ciepła ustalono moc nominalną absorpcyjnej pompy ciepła oraz moc wymiennika szczytowego. W celu realizacji obliczeń opracowano model symulacyjny absorpcyjnej pompy ciepła, który został zintegrowany z nadkrytycznym blokiem parowym o mocy 900 MWe. Model pompy ciepła został opracowany z wykorzystaniem charakterystyk rzeczywistego urządzenia. W wyniku przeprowadzonych obliczeń symulacyjnych ustalono, że dla analizowanego przypadku pompa ciepła o mocy 17,5MWt pozwala na pokrycie produkcji ciepła na potrzeby dedykowanego odbiorcy w 90%. Stwierdzono ponadto, że zastosowanie absorpcyjnej pompy ciepla wraz ze szczytowym wymiennikiem ciepła pozwala na zmniejszenie o 35% negatywnego wpływu na produkcję energii elektrycznej, w porównaniu do wariantu z dedykowanym klasycznym wymiennikiem ciepła. Efekt ten jest bezpośrednim wynikiem zwiększenia sprawności wytwarzania energii w kogeneracji, dzięki zastosowaniu absorpcyjnej pompy ciepła.This paper presents the results of numerical simulations of absorption heat pump application for cogeneration electricity and heat production delivered to dedicated recipients. Two cases of heat production were analysed. First, as a reference unit, the study examined a standard heat exchanger (DWC) fed with steam taken from turbine steam bleeding. The second analysed configuration was an absorption heat pump (APC) equipped with a pick heat exchanger (SWC). The heat parameters were assumed based on the structured graph of outer air temperatures for a dedicated recipient locality as well as on a regulation table. The nominal thermal power of APC and SWC was also assumed based on the dedicated recipient’s needs. The simulation model of the absorption heat pump was developed and integrated with a model of a supercritical, 900MWe power plant. The absorption heat pump model was developed with the use of real APC characteristics. The results of the calculations performed show that the analysed heat pump of 17.5MWt power makes it possible to cover almost 90% of particular receiver of heat. Moreover, application of an absorption heat pump equipped with a pick heat exchanger decreases the negative impact on electricity production by about 35% when compared to heat production by heat exchanger alone. This is a direct result of increasing the cogeneration efficiency for simultaneous production of heat and electricity, due to the application of APC

Evaluation of effects of certain parameters related with hip joint on the functional capacity in children with cerebral palsy

Cerebral palsy (CP) is a neuro-developmental disorder resulting from nonprogressive injury of immature brain tissue. Deformity of lower extremity is a frequently seen condition in children with CP. The changes in the hip joint and related anatomical structures affect the functional capacity and restrict ambulation of the children with CP.In this study, parameters like the collodiaphyseal angle (femoral inclination), acetabular index angle (AI), center edge angle (CE), migration percentage (MP) and pelvic obliquity (PO), which are used to evaluate the hip joint and its pathological changes, were measured. The effects of the obtained results on the functional capacity of the lower extremity that was assessed by the gross motor function measure were investigated in children with CP. The relationships of these parameters within the CP group and with the control group were examined. The CP group was composed of 34 children (24 hemiparetic and 10 diparetic, Gross Motor Functional Classification System level I) while the control group was composed of 26 children who visited the emergency department because of trauma without dislocation and broken of the hips, legs and spine.It was found that hemiparetic and diparetic children with CP, who were at the same GMFCS level and age group, had similar hip morphology. However, the results have revealed that hemiparetic children had better walking, running and jumping abilities than those of diparetics according to the gross motor function measure. No difference was determined between the children with CP and the control group regarding the measured parameters of hip morphology, except PO. Both in the children with CP and the control group, the femoral inclination angle was found to be higher bilaterally comparing with previous data. It was thought that the increase in AI angle of the diparetic children with CP may cause susceptibility to hip displacement

Epstein-Barr virus encephalitis with substantia nigra involvement

Infectious mononucleosis due to Epstein-Barr virus (EBV) is a usually benign systemic viral illness common in children. Many studies described nervous system manifestations of infectious mononucleosis with a wide spectrum of neurologic deficits. Neurologic complications of EBV are seen in both acute and reactivate infection. Herein, we describe a patient diagnosed by acute EBV encephalitis with substantia nigra involvement and excellent clinical recovery. © 2015 Journal of Pediatric Neurosciences | Published by Wolters Kluwer - Medknow

Determination of genetic anomalies by RT-PCR method, and the importance of prognosis in childhood leukemia

31st Congress of the Federation-of-European-Biochemical-Societies (FEBS) -- JUN 24-29, 2006 -- Istanbul, TURKEYWOS: 000238914002382…Federat European Biochem So

Treatment results of non-hodgkin's lymphoma cases in çukurova region of turkey [Türkiye'nin çukurova bölgesinde non-hodgkin lenfoma olgularinin tedavi sonuçlari]

Purpose: We aimed to evaluate the clinicopathological characteristics and prognostic features of non-Hodgkin lymphoma (NHL) in pediatric patients in Çukurova Region, Turkey. Material and Methods: Histopathologically, 24 (63.2%) patients were diagnosed as Burkitt lymphoma, 12 (31.6%) patients were diagnosed as T-cell lymphoblastic lymphoma and 2 (5.2%) patients were diagnosed as diffuse large cell lymphoma. Patients were staged according to Murphy's classification in children. Treatment protocols of BFM-90 and LSA2L2 were applied to patients. Results: While mean age of 38 patients with NHL was 75.3±41.5 months, 12 (31.6%) patients were female and 26 (68.4%) patients were male. One (2.6%) patient was evaluated as stage I, 8 (21.1%) patients were as stage II, 18 (47.4%) patients were as stage III and, 11 (28.9%) patients were as stage IV. Overall survival for 5 years was found as 71%. When overall survival were estimated based on histopathological study, 93%, 56% and %50 were found for T-cell lymphoblastic lymphoma, Burkitt lenfoma and diffuse large cell group, respectively. Conclusion: The prognosis of NHL cases followed by our clinic varied according to the stage and istopathological type. Although most of our cases were Burkitt or stage III-IV lymphomas, the clinical response to the treatment protocols were similar to the literature

Sistatin C, KIM1 and NGAL as biological markers for detecting early kidney injury in HIV positive patients

WOS: 000494690300318

Clinical and Genetic Spectrum of Myotonia Congenita in Turkish Children

Background: Myotonia congenita is the most common form of nondystrophic myotonia and is caused by Mendelian inherited mutations in the CLCN1 gene encoding the voltage-gated chloride channel of skeletal muscle. Objective: The study aimed to describe the clinical and genetic spectrum of Myotonia congenita in a large pediatric cohort. Methods: Demographic, genetic, and clinical data of the patients aged under 18 years at time of first clinical attendance from 11 centers in different geographical regions of Turkiye were retrospectively investigated. Results: Fifty-four patients (mean age:15.2 years (+/- 5.5), 76% males, with 85% Becker, 15% Thomsen form) from 40 families were included. Consanguineous marriage rate was 67%. 70.5% of patients had a family member with Myotonia congenita. The mean age of disease onset was 5.7 (+/- 4.9) years. Overall 23 different mutations (2/23 were novel) were detected in 52 patients, and large exon deletions were identified in two siblings. Thomsen and Becker forms were observed concomitantly in one family. Carbamazepine (46.3%), mexiletine (27.8%), phenytoin (9.3%) were preferred for treatment. Conclusions: The clinical and genetic heterogeneity, as well as the limited response to current treatment options, constitutes an ongoing challenge. In our cohort, recessive Myotonia congenita was more frequent and novel mutations will contribute to the literature