scholarly journals EVALUATION OF EFFICIENCY HEAT EXCHANGERS WITH ZONE VACUUM INSULATION FOR RECOVERY SYSTEM OF HEAT LOSS COMPRESSOR UNITS

2020 ◽  
Vol 2 (№4 2020) ◽  
pp. 216-222
Author(s):  
A.M. Kalashnikov ◽  
A.A. Kapelyukhovskaya ◽  
G.I. Chernov
Keyword(s):  
Heat Loss ◽  
Heat Exchangers ◽  
Vacuum Insulation ◽  
Recovery System

scholarly journals Possibilities of heat energy recovery from greywater systems

2018 ◽  
Vol 30 ◽  
pp. 03003 ◽  
Author(s):  
Kaja Niewitecka
Keyword(s):  
Waste Water ◽  
Heat Exchangers ◽  
Heat Recovery ◽  
Tap Water ◽  
Residential Building ◽  
Heat Energy ◽  
Alternative Source ◽  
Recovery System ◽  
Heat Recovery System ◽  
Sewage Systems

Waste water contains a large amount of heat energy which is irretrievably lost, so it is worth thinking about the possibilities of its recovery. It is estimated that in a residential building with full sanitary fittings, about 70% of the total tap water supplied is discharged as greywater and could be reused. The subject of the work is the opportunity to reuse waste water as an alternative source of heat for buildings. For this purpose, the design of heat exchangers used in the process of greywater heat recovery in indoor sewage systems, public buildings as well as in industrial plants has been reviewed. The possibility of recovering heat from waste water transported in outdoor sewage systems was also taken into consideration. An exemplary waste water heat recovery system was proposed, and the amount of heat that could be obtained using a greywater heat recovery system in a residential building was presented. The work shows that greywater heat recovery systems allow for significant savings in preheating hot tap water, and the rate of cost reimbursement depends on the purpose of the building and the type of installation. At the same time, the work shows that one should adjust the construction solutions of heat exchangers and indoor installations in buildings to the quality of the medium flowing, which is greywater.

Thermodynamic Optimization of Solar-Driven Refrigerators

1996 ◽  
Vol 118 (2) ◽  
pp. 130-135 ◽  
Author(s):  
J. V. C. Vargas ◽  
M. Sokolov ◽  
A. Bejan
Keyword(s):  
Heat Loss ◽  
Heat Exchangers ◽  
Solar Collector ◽  
Thermal Conductance ◽  
Finite Size ◽  
Operating Conditions ◽  
Price Ratio ◽  
Thermodynamic Optimization ◽  
Work Input ◽  
Collector Temperature

This paper describes the thermodynamic optimization of a class of refrigerators without work input, which are driven by heat transfer from a solar collector. The model consists of a finite-size solar collector with heat loss to the ambient, and a refrigerator with three finite-size heat exchangers, namely, the evaporator between refrigeration load and refrigerant, the condenser between the refrigerant and the ambient, and the heat exchanger between the solar collector and the refrigerant. The total thermal conductance of the three heat exchangers is fixed. The solar collector heat loss to the ambient is proportional to the collector-ambient temperature difference. The first part of the paper reports the operating conditions for maximum refrigeration effect, specifically, the optimal collector temperature, and the optimal way of allocating the thermal conductance inventory to the three heat exchangers. For example, the optimal condenser conductance is equal to half of the total thermal conductance, and is independent of other operating parameters. The second part of the paper examines the changes in the optimal design when the price of the refrigeration load (pL) is different (higher) than the price of the heat input provided by the collector (pH). The optimal collector temperature and the optimal three-way allocation of the thermal conductance inventory are reported as functions of the price ratio pH/pL.

Some characteristics of core temperature signals in the conscious goat

1984 ◽  
Vol 247 (3) ◽  
pp. R456-R464 ◽  
Author(s):  
C. Jessen ◽  
G. Feistkorn
Keyword(s):  
Heat Loss ◽  
Core Temperature ◽  
Temperature Difference ◽  
Heat Production ◽  
Heat Exchangers ◽  
Response Curve ◽  
Temperature Response ◽  
Warm Receptors ◽  
Core Sensors Of Temperature ◽  
Head Temperature

In three conscious goats, head and trunk temperatures were altered independently of each other by means of extracorporeal carotid heat exchangers and intravascular heat exchangers in the trunk veins. In 35 experiments heat production and heat loss were measured while head temperature was varied between 35.4 and 42.2 degrees C and trunk temperature between 34.5 and 42.4 degrees C. The largest temperature difference between head and trunk amounted to 6.6 degrees C. Head and trunk generated approximately equal fractions of the total core temperature input to the controller. The distribution of combinations of head and trunk temperatures resulting in constant levels of heat production and heat loss was consistent with the hypothesis that the total core temperature input to the controller equaled the sum of two identical inputs, both rising exponentially with temperature. The hypothesis implies that the input generated by core sensors of temperature in head and trunk is a continuum and conforms with the temperature-response curve of warm receptors.

Research on the Utilization of Exhaust Gas Heat for Boilers

2014 ◽  
Vol 643 ◽  
pp. 322-327
Author(s):  
Hui Bin Zhang ◽  
Bin Li ◽  
Ya Qing Jia
Keyword(s):  
Heat Loss ◽  
Heat Exchangers ◽  
Economic Benefits ◽  
Exhaust Gas ◽  
Gas Temperature ◽  
Heating Period ◽  
Coal Consumption ◽  
Exhaust Heat ◽  
Before And After ◽  
Exhaust Gas Temperature

The exhaust heat loss of the power plant boiler can account for more half of the boiler heat loss, exhaust gas temperature is 110~160 °Ccommonly, so the exhaust gas heat can be used to reduce the coal consumption, raise the economic benefits. Before and after the desulfurization tower of a 350 MW unit, there installs two plate heat exchangers, heating condensation water respectively, which can improve the thermal efficiency. With two heat exchangers working under the design conditions, a test was carried out based on a 350 WM unit simulation system in order to test the influence of system for unit operation characteristics. Referring to the data, the investment of the heat exchanger can achieve 2.68 g/kWh coal saving during the non-heating period and 0.2531 g/kWh during the heating period.

scholarly journals Heat loss recovery system of mobile compressor unit based on absorption refrigerating machine

2020 ◽  
Vol 4 (3) ◽  
pp. 15-19
Author(s):  
V. L. Yusha ◽  
◽  
G. I. Chernov ◽  
D. V. Rubtsov ◽  
S. L. Terentjev ◽  
...  
Keyword(s):  
Heat Loss ◽  
Compressor Unit ◽  
Loss Recovery ◽  
Recovery System ◽  
Mobile Compressor

Control of respiratory evaporative heat loss in exercising goats

1979 ◽  
Vol 46 (5) ◽  
pp. 978-983 ◽  
Author(s):  
J. B. Mercer ◽  
C. Jessen
Keyword(s):  
Heat Loss ◽  
Core Temperature ◽  
Heat Exchangers ◽  
The Body ◽  
Body Core Temperature ◽  
Evaporative Heat Loss ◽  
Hypothalamic Temperature ◽  
Body Core ◽  
Total Body ◽  
Rest And Exercise

Investigations were carried out to determine whether a nonthermal input is involved in the control of respiratory evaporative heat loss (REHL) in exercising goats. Two goats were implanted with hypothalamic perfusion thermodes and three goats were implanted with intravascular heat exchangers to clamp hypothalamic temperature and total body core temperature, respectively. At 30 degrees C air temperature REHL was measured while the animals were resting or walking on a treadmill (3 km.h-1, 5 degrees gradient). When the hypothalamic temperature was clamped between 33.0 and 43.0 degrees C the slopes of the responses relating increased REHL to hypothalamic temperature were similar during rest and exercise. However, the threshold hypothalamic temperatures for the increased REHL responses were lower during exercise than at rest, presumably due to higher extrahypothalamic temperatures. When the body core temperature was clamped between 37.0 and 40.4 degrees C the slopes of the responses relating increased REHL to total body core temperature during exercise showed only minor differences compared to those at rest, none of them conclusively indicating nonthermal influences.

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