نتایج جستجو برای: heat rejection
تعداد نتایج: 236358 فیلتر نتایج به سال:
• Zeotropic refrigerants are evaluated experimentally in dedicated subcooling system a CO 2 plant. Temperature glide of mixtures allows reducing irreversibilities the subcooler. A refrigeration plant is tested at three heat rejection and one evaporation temperatures. Optimum working conditions, pressure degree, determined. R-600/R-152a [60/40%] provides 1.4% COP increment relation to R-152a. Us...
for monitoring of renal transplant function, serum b2m was evaluated in 23 recipients. according to clinical diagnosis the patients were in four groups: 1) successful renal transplant the mean concentration of sb2m pretransplantation was 73.1±26.1 mg/l but decreased to nearly normal level (4.43±1.17 mg/l) within 24-48h and then reached to 3.1 mg/l duting 20 days after transplantation. 2) renal ...
Background and purpose: Kidney transplant is a major form of renal replacement therapy in many patients at advanced stages of the disease. Transplant rejection is a major complication following kidney transplant that could be reversible or irreversible. The present study was done to investigate the incidence of irreversible kidney transplant rejection. Materials and methods: A retrospective co...
introduction: acute rejection of renal transplant is a serious and common systemic inflammatory disorder which leads to decreasing half-life of transplant organ. current diagnoses method is an invasive biopsy procedure on allogtraft kidney. therefore, applying a novel and noninvasive diagnostic method such as granzym b level in acute renal transplantation could help patients and improves surviv...
Background & Aim: Previously, patients with end stage renal failure(ESRF) and lower urinary tract abnormality(LUTA) were often considered high risk for renal transplantation. In order to examine the degree of risk, 48 patients who received renal transplants in Labafi Nejad Hospital were evaluated between 1986 and 2003. Patients & Method: In this retrospective cohort study, the mean age of t...
A thermodynamic limitation of single-component working fluids in organic Rankine cycles (ORCs) is the large exergy destruction (and, consequently, useful power loss) associated with evaporation and condensation. Due to their non-isothermal phasechange behaviour, non-azeotropic working-fluid mixtures have shown reduced exergy losses, leading to improved cycle efficiencies and power outputs. Thes...
This work analyses the influence of Internal Heat Exchan ger (IHX) on energy performance a vapor compression cycle associated with freezing cabinet using different R404A low-GWP alternatives. Among them, refrigerants R454C (GPW100=146), R455A R468A R290 (GPW100=5) and R1270 (GPW100=1.8) have been tested in horizontal maintaining product target temperature -20°C at heat rejection temperatures 20...
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