摘要:
A two-stage cascade refrigeration system is provided having a first refrigeration stage and a second refrigeration stage. The first refrigeration stage defines a first fluid circuit for circulating a first refrigerant, and has a first compressor, a condenser, and a first expansion device that is in fluid communication with the first fluid circuit. The second refrigeration stage defines a second fluid circuit for circulating a second refrigerant, with the second refrigeration stage having a second compressor, a second expansion device, and an evaporator that is in fluid communication with the second fluid circuit. A heat exchanger is in fluid communication with the first and second fluid circuits to exchange heat between the first and second refrigerants. At least one of the first or second compressors is a variable speed compressor.
摘要:
A two-stage cascade refrigeration system is provided having a first refrigeration stage and a second refrigeration stage. The first refrigeration stage defines a first fluid circuit for circulating a first refrigerant, and has a first compressor, a condenser, and a first expansion device that is in fluid communication with the first fluid circuit. The second refrigeration stage defines a second fluid circuit for circulating a second refrigerant, with the second refrigeration stage having a second compressor, a second expansion device, and an evaporator that is in fluid communication with the second fluid circuit. A heat exchanger is in fluid communication with the first and second fluid circuits to exchange heat between the first and second refrigerants. At least one of the first or second compressors is a variable speed compressor.
摘要:
A two-stage cascade refrigeration system is provided having a first refrigeration stage and a second refrigeration stage. The first refrigeration stage defines a first fluid circuit for circulating a first refrigerant, and has a first compressor, a condenser, and a first expansion device that is in fluid communication with the first fluid circuit. The second refrigeration stage defines a second fluid circuit for circulating a second refrigerant, with the second refrigeration stage having a second compressor, a second expansion device, and an evaporator that is in fluid communication with the second fluid circuit. A heat exchanger is in fluid communication with the first and second fluid circuits to exchange heat between the first and second refrigerants. At least one of the first or second compressors is a variable speed compressor.
摘要:
A two-stage cascade refrigeration system is provided having a first refrigeration stage and a second refrigeration stage. The first refrigeration stage defines a first fluid circuit for circulating a first refrigerant, and has a first compressor, a condenser, and a first expansion device that is in fluid communication with the first fluid circuit. The second refrigeration stage defines a second fluid circuit for circulating a second refrigerant, with the second refrigeration stage having a second compressor, a second expansion device, and an evaporator that is in fluid communication with the second fluid circuit. A heat exchanger is in fluid communication with the first and second fluid circuits to exchange heat between the first and second refrigerants. At least one of the first or second compressors is a variable speed compressor.
摘要:
FIG. 1 is a front, right and top perspective view of a toothbrush head, showing my design. FIG. 2 is a rear, left and bottom perspective view thereof. FIG. 3 is a front elevation view thereof. FIG. 4 is a rear elevation view thereof. FIG. 5 is a left side elevation view thereof. FIG. 6 is a right side elevation view thereof. FIG. 7 is a top plan view thereof; and, FIG. 8 is a bottom plan view thereof. The broken lines depict portions of the toothbrush head that form no part of the claimed design.
摘要:
An opto-electronic device includes: (1) a first electrode; (2) at least one semiconductor layer disposed over the first electrode, the semiconductor layer including an emissive layer; and (3) a second electrode disposed over the semiconductor layer. The second electrode includes a fullerene-containing magnesium alloy which includes a non-zero amount of a fullerene of up to about 15 vol. % of the fullerene, and the second electrode has a thickness of about 50 nm or less.
摘要:
A method of preparing a purified collagen solution from porcine skin may include receiving and inspecting the porcine skin; treating the porcine skin with a sodium hydroxide treatment, resulting in a sodium hydroxide processed skin; treating the sodium hydroxide processed skin with an ethanol treatment, resulting in ethanol treated processed skin; producing liquid collagen from the ethanol treated processed skin; clarifying the liquid collagen; and concentrating the clarified liquid collagen.
摘要:
The present invention provides non-coding regulatory element polynucleotide molecules isolated from the lipid transfer protein (LTP) gene of Oryza sativa and useful for expressing transgenes in plants. The invention further discloses compositions, polynucleotide constructs, transformed host cells, transgenic plants and seeds containing the Oryza sativa regulatory polynucleotide sequences, and methods for preparing and using the same.