Hotels and inns place a high priority on energy conservation, as it directly impacts their overall costs. In light of this, integrating the most energy-efficient technologies, such as solar and air-source systems, provides hotels and inns with suitable hot water engineering solutions.

Hotel and Hotel Hot Water Systems - Design and Cost Calculation for Hotel Hot Water Systems

Section 1: General Parameter Calculation for Hotel and Inn Hot Water System Design

Hotel Hot Water Supply Calculation: Standard hotel rooms are designed to accommodate 2 people for bathing daily, with a hot water supply of 60kg per person per day.

2. Hot Water Temperature for Hotels and Guesthouses: 55°C

3. Hot Water Supply: 24-hour hot water availability

4. The average water temperature increase is 40°C (with an incoming water temperature of 15°C and a hot water supply temperature of 55°C).

5. Comparison of Costs for Hot Water Heating Methods:

The electricity price is calculated at 0.8 yuan per kilowatt-hour. Diesel is priced at 7 yuan per kilogram, and natural gas at 2 yuan per cubic meter (actual costs vary by location).

The calorific value of electricity is 860 kcal/kWh, diesel fuel is 10200 kcal/kg, and natural gas is 8500 kcal/m³.

(All specifics are subject to the hotel, inn, or hostel themselves.)

Section II: Comparison of Annual Operating Costs for Hotel Air Source Heat Pumps, Diesel, and Gasoline

1. Calculation of Annual Operation Costs for Air Source Heat Pumps

To heat N tons from 15°C to 55°C, the daily electricity required is: N000 kg × 1 kcal/kg.°C × 40°C ÷ (860 kcal/degree × COP 4.0) = N degrees.

Annual electricity cost: 365 days × N kWh × 0.8 RMB/kWh = N ten thousand yuan

2. Annual Fuel Boiler Operating Costs

The fuel required to supply N tons of 55°C hot water daily: N000kg × 1 kcal/kg.°C × 40°C ÷ (10200 kcal/kg × thermal efficiency 80%) = Nkg/day

Annual operating cost of fuel boiler: Nkg × 365 × 7 yuan/kg = N ten thousand yuan

3. Annual Operation Costs for Gas Boilers

The gas required to supply N tons of 55°C hot water daily: N000 kg × 1 kcal/kg.°C × 40°C ÷ (8500 kcal/cubic meter × thermal efficiency 75%) = N cubic meters/day

Annual Natural Gas Cost: N cubic meters × 365 × 1.95 yuan/cubic meter = N ten thousand yuan. Generally speaking, systems with a COP (Coefficient of Performance) of 2 or higher can be defined as "Energy-saving Hot Water Systems."

For example:

Electric boiler COP = 0.95: Energy input : Heat output = 1 : 0.95

The coal boiler has a COP of 1.2, meaning the fuel-to-heat output ratio is 1:1.2.

The COP of the air-source heat pump system is 3.2, meaning the electrical energy consumed to produce heat is 1:3.3.

The COP of the dual-energy solar and air-source heat pump hot water system exceeds 4.5, with an energy consumption to heat output ratio of 1:4.5.

Note: The core components of solar and air-source hot water systems are the solar collectors and air-source heat pumps. On sunny days, the systems harness solar energy to heat cold water within flat plate solar collectors or vacuum tube collectors. During rainy, snowy, or cloudy days, the air-source is used to heat the cold water, combining the two methods for energy-saving efficiency.

Hotels and hotels can save up to 75% on annual costs compared to electric water heaters, 66% compared to oil heaters, and 33% compared to gas water heaters. Moreover, the installation of air-source heat pump water heating systems in hotels is convenient, safe, environmentally friendly, and does not require professional management. They operate automatically and have a lifespan of over 15 years.

Section 3: Hotel and Inn Solar Hot Water Systems and Components

The core components of solar water heating and air-source heat pump systems are the solar collectors and air-source heat pumps, which utilize solar energy to heat cold water inside flat plate solar collectors or vacuum tube collectors. Therefore, when installing, the issue of sunlight exposure must be considered; at the same time, due to the hotel's emphasis on aesthetics, it is advisable to collaborate with the architectural design institute responsible for the hotel's construction to develop the hot water project, in order to achieve near perfection.

Combination of Solar Energy and Air Source Heat Pump Hot Water System

1. Key Features of Solar and Air Source Heat Pump Hot Water Systems:

1) The solar and air-source heat pump hot water system control technology has achieved智能化, placing it at the world's leading level. It has significantly increased the utilization of solar energy while reducing the consumption of auxiliary heating energy.

(2) Sunny fully utilizes solar energy to supply hot water 24/7.

(3) Offers constant temperature hot water supply.

(4) Utilizing an air-source heat pump for auxiliary heating during rainy weather, complemented by an electric heating backup emergency system. This system heats only the amount of hot water needed, offering energy efficiency and convenience.

(5) The solar-assisted air-source heat pump central hot water system features automatic temperature rise and control, as well as fully automatic operation. It is a high-safety hot water system among all central hot water systems, with automatic water intake and pressure boost, saving labor, materials, and financial resources for enterprises and institutions.

2. Advantages

(1) Utilizing an intelligent constant-temperature direct heating operation mode, it ensures that all the water entering the storage tank at the set temperature meets the required usage temperature.

(2) The use of a hot water temperature difference circulation operation method can avoid the drawback of the system requiring auxiliary heating to compensate for heat loss when the user does not use hot water for an extended period, as opposed to the fixed temperature direct current method.

(3) Implementing a hot water supply system with temperature and variable frequency control pumps to address issues such as temperature drop caused by heat dissipation in the hot water supply lines.

(4) Utilizing an intelligent direct-heat air-source heat pump for auxiliary constant-temperature heating, efficiently and rapidly addressing the issue of insufficient hot water supply during overcast, rainy, snowy, and freezing weather when solar energy is limited.

(5) An emergency heating backup system is in place to ensure hot water supply in any unforeseen emergency situations.